goja.core.kits.base.Strs Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2013-2014 sagyf Yang. The Four Group.
*/
package goja.core.kits.base;
import com.google.common.base.Charsets;
import com.google.common.base.Strings;
import goja.core.StringPool;
import goja.core.Validator;
import goja.core.kits.ObjectKit;
import goja.core.kits.collection.CollectionKit;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TimeZone;
import java.util.TreeSet;
import java.util.UUID;
/**
* Miscellaneous {@link String} utility methods.
*
* Mainly for internal use within the framework; consider
* Jakarta's Commons Lang
* for a more comprehensive suite of String utilities.
*
*
This class delivers some simple functionality that should really
* be provided by the core Java {@code String} and {@link StringBuilder}
* classes, such as the ability to {@link #replace} all occurrences of a given
* substring in a target string. It also provides easy-to-use methods to convert
* between delimited strings, such as CSV strings, and collections and arrays.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Keith Donald
* @author Rob Harrop
* @author Rick Evans
* @author Arjen Poutsma
* @since 16 April 2001
*/
public class Strs {
private static final char EXTENSION_SEPARATOR = '.';
//---------------------------------------------------------------------
// General convenience methods for working with Strings
//---------------------------------------------------------------------
/**
* Check whether the given String is empty.
*
This method accepts any Object as an argument, comparing it to
* {@code null} and the empty String. As a consequence, this method
* will never return {@code true} for a non-null non-String object.
*
The Object signature is useful for general attribute handling code
* that commonly deals with Strings but generally has to iterate over
* Objects since attributes may e.g. be primitive value objects as well.
* @param str the candidate String
* @since 3.2.1
*/
public static boolean isEmpty(Object str) {
return (str == null || "".equals(str));
}
/**
* Check that the given CharSequence is neither {@code null} nor of length 0.
* Note: Will return {@code true} for a CharSequence that purely consists of whitespace.
*
* StringUtils.hasLength(null) = false
* StringUtils.hasLength("") = false
* StringUtils.hasLength(" ") = true
* StringUtils.hasLength("Hello") = true
*
* @param str the CharSequence to check (may be {@code null})
* @return {@code true} if the CharSequence is not null and has length
* @see #hasText(String)
*/
public static boolean hasLength(CharSequence str) {
return (str != null && str.length() > 0);
}
/**
* Check that the given String is neither {@code null} nor of length 0.
* Note: Will return {@code true} for a String that purely consists of whitespace.
* @param str the String to check (may be {@code null})
* @return {@code true} if the String is not null and has length
* @see #hasLength(CharSequence)
*/
public static boolean hasLength(String str) {
return hasLength((CharSequence) str);
}
/**
* Check whether the given CharSequence has actual text.
* More specifically, returns {@code true} if the string not {@code null},
* its length is greater than 0, and it contains at least one non-whitespace character.
*
* StringUtils.hasText(null) = false
* StringUtils.hasText("") = false
* StringUtils.hasText(" ") = false
* StringUtils.hasText("12345") = true
* StringUtils.hasText(" 12345 ") = true
*
* @param str the CharSequence to check (may be {@code null})
* @return {@code true} if the CharSequence is not {@code null},
* its length is greater than 0, and it does not contain whitespace only
* @see Character#isWhitespace
*/
public static boolean hasText(CharSequence str) {
if (!hasLength(str)) {
return false;
}
int strLen = str.length();
for (int i = 0; i < strLen; i++) {
if (!Character.isWhitespace(str.charAt(i))) {
return true;
}
}
return false;
}
/**
* Check whether the given String has actual text.
* More specifically, returns {@code true} if the string not {@code null},
* its length is greater than 0, and it contains at least one non-whitespace character.
* @param str the String to check (may be {@code null})
* @return {@code true} if the String is not {@code null}, its length is
* greater than 0, and it does not contain whitespace only
* @see #hasText(CharSequence)
*/
public static boolean hasText(String str) {
return hasText((CharSequence) str);
}
/**
* Check whether the given CharSequence contains any whitespace characters.
* @param str the CharSequence to check (may be {@code null})
* @return {@code true} if the CharSequence is not empty and
* contains at least 1 whitespace character
* @see Character#isWhitespace
*/
public static boolean containsWhitespace(CharSequence str) {
if (!hasLength(str)) {
return false;
}
int strLen = str.length();
for (int i = 0; i < strLen; i++) {
if (Character.isWhitespace(str.charAt(i))) {
return true;
}
}
return false;
}
/**
* Check whether the given String contains any whitespace characters.
* @param str the String to check (may be {@code null})
* @return {@code true} if the String is not empty and
* contains at least 1 whitespace character
* @see #containsWhitespace(CharSequence)
*/
public static boolean containsWhitespace(String str) {
return containsWhitespace((CharSequence) str);
}
/**
* Trim leading and trailing whitespace from the given String.
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimWhitespace(String str) {
if (!hasLength(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
sb.deleteCharAt(0);
}
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
/**
* Trim all whitespace from the given String:
* leading, trailing, and in between characters.
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimAllWhitespace(String str) {
if (!hasLength(str)) {
return str;
}
int len = str.length();
StringBuilder sb = new StringBuilder(str.length());
for (int i = 0; i < len; i++) {
char c = str.charAt(i);
if (!Character.isWhitespace(c)) {
sb.append(c);
}
}
return sb.toString();
}
/**
* Trim leading whitespace from the given String.
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimLeadingWhitespace(String str) {
if (!hasLength(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
sb.deleteCharAt(0);
}
return sb.toString();
}
/**
* Trim trailing whitespace from the given String.
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimTrailingWhitespace(String str) {
if (!hasLength(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
/**
* Trim all occurrences of the supplied leading character from the given String.
* @param str the String to check
* @param leadingCharacter the leading character to be trimmed
* @return the trimmed String
*/
public static String trimLeadingCharacter(String str, char leadingCharacter) {
if (!hasLength(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && sb.charAt(0) == leadingCharacter) {
sb.deleteCharAt(0);
}
return sb.toString();
}
/**
* Trim all occurrences of the supplied trailing character from the given String.
* @param str the String to check
* @param trailingCharacter the trailing character to be trimmed
* @return the trimmed String
*/
public static String trimTrailingCharacter(String str, char trailingCharacter) {
if (!hasLength(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && sb.charAt(sb.length() - 1) == trailingCharacter) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
/**
* Test if the given String starts with the specified prefix,
* ignoring upper/lower case.
* @param str the String to check
* @param prefix the prefix to look for
* @see java.lang.String#startsWith
*/
public static boolean startsWithIgnoreCase(String str, String prefix) {
if (str == null || prefix == null) {
return false;
}
if (str.startsWith(prefix)) {
return true;
}
if (str.length() < prefix.length()) {
return false;
}
String lcStr = str.substring(0, prefix.length()).toLowerCase();
String lcPrefix = prefix.toLowerCase();
return lcStr.equals(lcPrefix);
}
/**
* Test if the given String ends with the specified suffix,
* ignoring upper/lower case.
* @param str the String to check
* @param suffix the suffix to look for
* @see java.lang.String#endsWith
*/
public static boolean endsWithIgnoreCase(String str, String suffix) {
if (str == null || suffix == null) {
return false;
}
if (str.endsWith(suffix)) {
return true;
}
if (str.length() < suffix.length()) {
return false;
}
String lcStr = str.substring(str.length() - suffix.length()).toLowerCase();
String lcSuffix = suffix.toLowerCase();
return lcStr.equals(lcSuffix);
}
/**
* Test whether the given string matches the given substring
* at the given index.
* @param str the original string (or StringBuilder)
* @param index the index in the original string to start matching against
* @param substring the substring to match at the given index
*/
public static boolean substringMatch(CharSequence str, int index, CharSequence substring) {
for (int j = 0; j < substring.length(); j++) {
int i = index + j;
if (i >= str.length() || str.charAt(i) != substring.charAt(j)) {
return false;
}
}
return true;
}
/**
* Count the occurrences of the substring in string s.
* @param str string to search in. Return 0 if this is null.
* @param sub string to search for. Return 0 if this is null.
*/
public static int countOccurrencesOf(String str, String sub) {
if (str == null || sub == null || str.length() == 0 || sub.length() == 0) {
return 0;
}
int count = 0;
int pos = 0;
int idx;
while ((idx = str.indexOf(sub, pos)) != -1) {
++count;
pos = idx + sub.length();
}
return count;
}
/**
* Replace all occurrences of a substring within a string with
* another string.
* @param inString String to examine
* @param oldPattern String to replace
* @param newPattern String to insert
* @return a String with the replacements
*/
public static String replace(String inString, String oldPattern, String newPattern) {
if (!hasLength(inString) || !hasLength(oldPattern) || newPattern == null) {
return inString;
}
StringBuilder sb = new StringBuilder();
int pos = 0; // our position in the old string
int index = inString.indexOf(oldPattern);
// the index of an occurrence we've found, or -1
int patLen = oldPattern.length();
while (index >= 0) {
sb.append(inString.substring(pos, index));
sb.append(newPattern);
pos = index + patLen;
index = inString.indexOf(oldPattern, pos);
}
sb.append(inString.substring(pos));
// remember to append any characters to the right of a match
return sb.toString();
}
/**
* Delete all occurrences of the given substring.
* @param inString the original String
* @param pattern the pattern to delete all occurrences of
* @return the resulting String
*/
public static String delete(String inString, String pattern) {
return replace(inString, pattern, "");
}
/**
* Delete any character in a given String.
* @param inString the original String
* @param charsToDelete a set of characters to delete.
* E.g. "az\n" will delete 'a's, 'z's and new lines.
* @return the resulting String
*/
public static String deleteAny(String inString, String charsToDelete) {
if (!hasLength(inString) || !hasLength(charsToDelete)) {
return inString;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < inString.length(); i++) {
char c = inString.charAt(i);
if (charsToDelete.indexOf(c) == -1) {
sb.append(c);
}
}
return sb.toString();
}
//---------------------------------------------------------------------
// Convenience methods for working with formatted Strings
//---------------------------------------------------------------------
/**
* Quote the given String with single quotes.
* @param str the input String (e.g. "myString")
* @return the quoted String (e.g. "'myString'"),
* or {@code null} if the input was {@code null}
*/
public static String quote(String str) {
return (str != null ? "'" + str + "'" : null);
}
/**
* Turn the given Object into a String with single quotes
* if it is a String; keeping the Object as-is else.
* @param obj the input Object (e.g. "myString")
* @return the quoted String (e.g. "'myString'"),
* or the input object as-is if not a String
*/
public static Object quoteIfString(Object obj) {
return (obj instanceof String ? quote((String) obj) : obj);
}
/**
* Unqualify a string qualified by a '.' dot character. For example,
* "this.name.is.qualified", returns "qualified".
* @param qualifiedName the qualified name
*/
public static String unqualify(String qualifiedName) {
return unqualify(qualifiedName, '.');
}
/**
* Unqualify a string qualified by a separator character. For example,
* "this:name:is:qualified" returns "qualified" if using a ':' separator.
* @param qualifiedName the qualified name
* @param separator the separator
*/
public static String unqualify(String qualifiedName, char separator) {
return qualifiedName.substring(qualifiedName.lastIndexOf(separator) + 1);
}
/**
* Capitalize a {@code String}, changing the first letter to
* upper case as per {@link Character#toUpperCase(char)}.
* No other letters are changed.
* @param str the String to capitalize, may be {@code null}
* @return the capitalized String, {@code null} if null
*/
public static String capitalize(String str) {
return changeFirstCharacterCase(str, true);
}
/**
* Uncapitalize a {@code String}, changing the first letter to
* lower case as per {@link Character#toLowerCase(char)}.
* No other letters are changed.
* @param str the String to uncapitalize, may be {@code null}
* @return the uncapitalized String, {@code null} if null
*/
public static String uncapitalize(String str) {
return changeFirstCharacterCase(str, false);
}
private static String changeFirstCharacterCase(String str, boolean capitalize) {
if (str == null || str.length() == 0) {
return str;
}
StringBuilder sb = new StringBuilder(str.length());
if (capitalize) {
sb.append(Character.toUpperCase(str.charAt(0)));
}
else {
sb.append(Character.toLowerCase(str.charAt(0)));
}
sb.append(str.substring(1));
return sb.toString();
}
/**
* Extract the filename from the given path,
* e.g. "mypath/myfile.txt" -> "myfile.txt".
* @param path the file path (may be {@code null})
* @return the extracted filename, or {@code null} if none
*/
public static String getFilename(String path) {
if (path == null) {
return null;
}
int separatorIndex = path.lastIndexOf(StringPool.SLASH);
return (separatorIndex != -1 ? path.substring(separatorIndex + 1) : path);
}
/**
* Extract the filename extension from the given path,
* e.g. "mypath/myfile.txt" -> "txt".
* @param path the file path (may be {@code null})
* @return the extracted filename extension, or {@code null} if none
*/
public static String getFilenameExtension(String path) {
if (path == null) {
return null;
}
int extIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
if (extIndex == -1) {
return null;
}
int folderIndex = path.lastIndexOf(StringPool.SLASH);
if (folderIndex > extIndex) {
return null;
}
return path.substring(extIndex + 1);
}
/**
* Strip the filename extension from the given path,
* e.g. "mypath/myfile.txt" -> "mypath/myfile".
* @param path the file path (may be {@code null})
* @return the path with stripped filename extension,
* or {@code null} if none
*/
public static String stripFilenameExtension(String path) {
if (path == null) {
return null;
}
int extIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
if (extIndex == -1) {
return path;
}
int folderIndex = path.lastIndexOf(StringPool.SLASH);
if (folderIndex > extIndex) {
return path;
}
return path.substring(0, extIndex);
}
/**
* Apply the given relative path to the given path,
* assuming standard Java folder separation (i.e. "/" separators).
* @param path the path to start from (usually a full file path)
* @param relativePath the relative path to apply
* (relative to the full file path above)
* @return the full file path that results from applying the relative path
*/
public static String applyRelativePath(String path, String relativePath) {
int separatorIndex = path.lastIndexOf(StringPool.SLASH);
if (separatorIndex != -1) {
String newPath = path.substring(0, separatorIndex);
if (!relativePath.startsWith(StringPool.SLASH)) {
newPath += StringPool.SLASH;
}
return newPath + relativePath;
}
else {
return relativePath;
}
}
/**
* Normalize the path by suppressing sequences like "path/.." and
* inner simple dots.
* The result is convenient for path comparison. For other uses,
* notice that Windows separators ("\") are replaced by simple slashes.
* @param path the original path
* @return the normalized path
*/
public static String cleanPath(String path) {
if (path == null) {
return null;
}
String pathToUse = replace(path, StringPool.BACK_SLASH, StringPool.SLASH);
// Strip prefix from path to analyze, to not treat it as part of the
// first path element. This is necessary to correctly parse paths like
// "file:core/../core/io/Resource.class", where the ".." should just
// strip the first "core" directory while keeping the "file:" prefix.
int prefixIndex = pathToUse.indexOf(":");
String prefix = "";
if (prefixIndex != -1) {
prefix = pathToUse.substring(0, prefixIndex + 1);
if (prefix.contains("/")) {
prefix = "";
}
else {
pathToUse = pathToUse.substring(prefixIndex + 1);
}
}
if (pathToUse.startsWith(StringPool.SLASH)) {
prefix = prefix + StringPool.SLASH;
pathToUse = pathToUse.substring(1);
}
String[] pathArray = delimitedListToStringArray(pathToUse, StringPool.SLASH);
List pathElements = new LinkedList();
int tops = 0;
for (int i = pathArray.length - 1; i >= 0; i--) {
String element = pathArray[i];
// if (StringPool.DOT.equals(element)) {
// Points to current directory - drop it.
// }
/* else*/ if (StringPool.DOTDOT.equals(element)) {
// Registering top path found.
tops++;
}
else {
if (tops > 0) {
// Merging path element with element corresponding to top path.
tops--;
}
else {
// Normal path element found.
pathElements.add(0, element);
}
}
}
// Remaining top paths need to be retained.
for (int i = 0; i < tops; i++) {
pathElements.add(0, StringPool.DOTDOT);
}
return prefix + collectionToDelimitedString(pathElements, StringPool.SLASH);
}
/**
* Compare two paths after normalization of them.
* @param path1 first path for comparison
* @param path2 second path for comparison
* @return whether the two paths are equivalent after normalization
*/
public static boolean pathEquals(String path1, String path2) {
return cleanPath(path1).equals(cleanPath(path2));
}
/**
* Parse the given {@code localeString} value into a {@link Locale}.
* This is the inverse operation of {@link Locale#toString Locale's toString}.
* @param localeString the locale String, following {@code Locale's}
* {@code toString()} format ("en", "en_UK", etc);
* also accepts spaces as separators, as an alternative to underscores
* @return a corresponding {@code Locale} instance
* @throws IllegalArgumentException in case of an invalid locale specification
*/
public static Locale parseLocaleString(String localeString) {
String[] parts = tokenizeToStringArray(localeString, "_ ", false, false);
String language = (parts.length > 0 ? parts[0] : "");
String country = (parts.length > 1 ? parts[1] : "");
validateLocalePart(language);
validateLocalePart(country);
String variant = "";
if (parts.length > 2) {
// There is definitely a variant, and it is everything after the country
// code sans the separator between the country code and the variant.
int endIndexOfCountryCode = localeString.indexOf(country, language.length()) + country.length();
// Strip off any leading '_' and whitespace, what's left is the variant.
variant = trimLeadingWhitespace(localeString.substring(endIndexOfCountryCode));
if (variant.startsWith("_")) {
variant = trimLeadingCharacter(variant, '_');
}
}
return (language.length() > 0 ? new Locale(language, country, variant) : null);
}
private static void validateLocalePart(String localePart) {
for (int i = 0; i < localePart.length(); i++) {
char ch = localePart.charAt(i);
if (ch != '_' && ch != ' ' && !Character.isLetterOrDigit(ch)) {
throw new IllegalArgumentException(
"Locale part \"" + localePart + "\" contains invalid characters");
}
}
}
/**
* Determine the RFC 3066 compliant language tag,
* as used for the HTTP "Accept-Language" header.
* @param locale the Locale to transform to a language tag
* @return the RFC 3066 compliant language tag as String
*/
public static String toLanguageTag(Locale locale) {
return locale.getLanguage() + (hasText(locale.getCountry()) ? "-" + locale.getCountry() : "");
}
/**
* Parse the given {@code timeZoneString} value into a {@link TimeZone}.
* @param timeZoneString the time zone String, following {@link TimeZone#getTimeZone(String)}
* but throwing {@link IllegalArgumentException} in case of an invalid time zone specification
* @return a corresponding {@link TimeZone} instance
* @throws IllegalArgumentException in case of an invalid time zone specification
*/
public static TimeZone parseTimeZoneString(String timeZoneString) {
TimeZone timeZone = TimeZone.getTimeZone(timeZoneString);
if ("GMT".equals(timeZone.getID()) && !timeZoneString.startsWith("GMT")) {
// We don't want that GMT fallback...
throw new IllegalArgumentException("Invalid time zone specification '" + timeZoneString + "'");
}
return timeZone;
}
//---------------------------------------------------------------------
// Convenience methods for working with String arrays
//---------------------------------------------------------------------
/**
* Append the given String to the given String array, returning a new array
* consisting of the input array contents plus the given String.
* @param array the array to append to (can be {@code null})
* @param str the String to append
* @return the new array (never {@code null})
*/
public static String[] addStringToArray(String[] array, String str) {
if (ObjectKit.isEmpty(array)) {
return new String[] {str};
}
String[] newArr = new String[array.length + 1];
System.arraycopy(array, 0, newArr, 0, array.length);
newArr[array.length] = str;
return newArr;
}
/**
* Concatenate the given String arrays into one,
* with overlapping array elements included twice.
*
The order of elements in the original arrays is preserved.
* @param array1 the first array (can be {@code null})
* @param array2 the second array (can be {@code null})
* @return the new array ({@code null} if both given arrays were {@code null})
*/
public static String[] concatenateStringArrays(String[] array1, String[] array2) {
if (ObjectKit.isEmpty(array1)) {
return array2;
}
if (ObjectKit.isEmpty(array2)) {
return array1;
}
String[] newArr = new String[array1.length + array2.length];
System.arraycopy(array1, 0, newArr, 0, array1.length);
System.arraycopy(array2, 0, newArr, array1.length, array2.length);
return newArr;
}
/**
* Merge the given String arrays into one, with overlapping
* array elements only included once.
*
The order of elements in the original arrays is preserved
* (with the exception of overlapping elements, which are only
* included on their first occurrence).
* @param array1 the first array (can be {@code null})
* @param array2 the second array (can be {@code null})
* @return the new array ({@code null} if both given arrays were {@code null})
*/
public static String[] mergeStringArrays(String[] array1, String[] array2) {
if (ObjectKit.isEmpty(array1)) {
return array2;
}
if (ObjectKit.isEmpty(array2)) {
return array1;
}
List result = new ArrayList();
result.addAll(Arrays.asList(array1));
for (String str : array2) {
if (!result.contains(str)) {
result.add(str);
}
}
return toStringArray(result);
}
/**
* Turn given source String array into sorted array.
* @param array the source array
* @return the sorted array (never {@code null})
*/
public static String[] sortStringArray(String[] array) {
if (ObjectKit.isEmpty(array)) {
return new String[0];
}
Arrays.sort(array);
return array;
}
/**
* Copy the given Collection into a String array.
* The Collection must contain String elements only.
* @param collection the Collection to copy
* @return the String array ({@code null} if the passed-in
* Collection was {@code null})
*/
public static String[] toStringArray(Collection collection) {
if (collection == null) {
return null;
}
return collection.toArray(new String[collection.size()]);
}
/**
* Copy the given Enumeration into a String array.
* The Enumeration must contain String elements only.
* @param enumeration the Enumeration to copy
* @return the String array ({@code null} if the passed-in
* Enumeration was {@code null})
*/
public static String[] toStringArray(Enumeration enumeration) {
if (enumeration == null) {
return null;
}
List list = Collections.list(enumeration);
return list.toArray(new String[list.size()]);
}
/**
* Trim the elements of the given String array,
* calling {@code String.trim()} on each of them.
* @param array the original String array
* @return the resulting array (of the same size) with trimmed elements
*/
public static String[] trimArrayElements(String[] array) {
if (ObjectKit.isEmpty(array)) {
return new String[0];
}
String[] result = new String[array.length];
for (int i = 0; i < array.length; i++) {
String element = array[i];
result[i] = (element != null ? element.trim() : null);
}
return result;
}
/**
* Remove duplicate Strings from the given array.
* Also sorts the array, as it uses a TreeSet.
* @param array the String array
* @return an array without duplicates, in natural sort order
*/
public static String[] removeDuplicateStrings(String[] array) {
if (ObjectKit.isEmpty(array)) {
return array;
}
Set set = new TreeSet();
for (String element : array) {
set.add(element);
}
return toStringArray(set);
}
/**
* Split a String at the first occurrence of the delimiter.
* Does not include the delimiter in the result.
* @param toSplit the string to split
* @param delimiter to split the string up with
* @return a two element array with index 0 being before the delimiter, and
* index 1 being after the delimiter (neither element includes the delimiter);
* or {@code null} if the delimiter wasn't found in the given input String
*/
public static String[] split(String toSplit, String delimiter) {
if (!hasLength(toSplit) || !hasLength(delimiter)) {
return null;
}
int offset = toSplit.indexOf(delimiter);
if (offset < 0) {
return null;
}
String beforeDelimiter = toSplit.substring(0, offset);
String afterDelimiter = toSplit.substring(offset + delimiter.length());
return new String[] {beforeDelimiter, afterDelimiter};
}
/**
* Take an array Strings and split each element based on the given delimiter.
* A {@code Properties} instance is then generated, with the left of the
* delimiter providing the key, and the right of the delimiter providing the value.
* Will trim both the key and value before adding them to the
* {@code Properties} instance.
* @param array the array to process
* @param delimiter to split each element using (typically the equals symbol)
* @return a {@code Properties} instance representing the array contents,
* or {@code null} if the array to process was null or empty
*/
public static Properties splitArrayElementsIntoProperties(String[] array, String delimiter) {
return splitArrayElementsIntoProperties(array, delimiter, null);
}
/**
* Take an array Strings and split each element based on the given delimiter.
* A {@code Properties} instance is then generated, with the left of the
* delimiter providing the key, and the right of the delimiter providing the value.
*
Will trim both the key and value before adding them to the
* {@code Properties} instance.
* @param array the array to process
* @param delimiter to split each element using (typically the equals symbol)
* @param charsToDelete one or more characters to remove from each element
* prior to attempting the split operation (typically the quotation mark
* symbol), or {@code null} if no removal should occur
* @return a {@code Properties} instance representing the array contents,
* or {@code null} if the array to process was {@code null} or empty
*/
public static Properties splitArrayElementsIntoProperties(
String[] array, String delimiter, String charsToDelete) {
if (ObjectKit.isEmpty(array)) {
return null;
}
Properties result = new Properties();
for (String element : array) {
if (charsToDelete != null) {
element = deleteAny(element, charsToDelete);
}
String[] splittedElement = split(element, delimiter);
if (splittedElement == null) {
continue;
}
result.setProperty(splittedElement[0].trim(), splittedElement[1].trim());
}
return result;
}
/**
* Tokenize the given String into a String array via a StringTokenizer.
* Trims tokens and omits empty tokens.
*
The given delimiters string is supposed to consist of any number of
* delimiter characters. Each of those characters can be used to separate
* tokens. A delimiter is always a single character; for multi-character
* delimiters, consider using {@code delimitedListToStringArray}
* @param str the String to tokenize
* @param delimiters the delimiter characters, assembled as String
* (each of those characters is individually considered as delimiter).
* @return an array of the tokens
* @see java.util.StringTokenizer
* @see String#trim()
* @see #delimitedListToStringArray
*/
public static String[] tokenizeToStringArray(String str, String delimiters) {
return tokenizeToStringArray(str, delimiters, true, true);
}
/**
* Tokenize the given String into a String array via a StringTokenizer.
*
The given delimiters string is supposed to consist of any number of
* delimiter characters. Each of those characters can be used to separate
* tokens. A delimiter is always a single character; for multi-character
* delimiters, consider using {@code delimitedListToStringArray}
* @param str the String to tokenize
* @param delimiters the delimiter characters, assembled as String
* (each of those characters is individually considered as delimiter)
* @param trimTokens trim the tokens via String's {@code trim}
* @param ignoreEmptyTokens omit empty tokens from the result array
* (only applies to tokens that are empty after trimming; StringTokenizer
* will not consider subsequent delimiters as token in the first place).
* @return an array of the tokens ({@code null} if the input String
* was {@code null})
* @see java.util.StringTokenizer
* @see String#trim()
* @see #delimitedListToStringArray
*/
public static String[] tokenizeToStringArray(
String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens) {
if (str == null) {
return null;
}
StringTokenizer st = new StringTokenizer(str, delimiters);
List tokens = new ArrayList();
while (st.hasMoreTokens()) {
String token = st.nextToken();
if (trimTokens) {
token = token.trim();
}
if (!ignoreEmptyTokens || token.length() > 0) {
tokens.add(token);
}
}
return toStringArray(tokens);
}
/**
* Take a String which is a delimited list and convert it to a String array.
* A single delimiter can consists of more than one character: It will still
* be considered as single delimiter string, rather than as bunch of potential
* delimiter characters - in contrast to {@code tokenizeToStringArray}.
* @param str the input String
* @param delimiter the delimiter between elements (this is a single delimiter,
* rather than a bunch individual delimiter characters)
* @return an array of the tokens in the list
* @see #tokenizeToStringArray
*/
public static String[] delimitedListToStringArray(String str, String delimiter) {
return delimitedListToStringArray(str, delimiter, null);
}
/**
* Take a String which is a delimited list and convert it to a String array.
*
A single delimiter can consists of more than one character: It will still
* be considered as single delimiter string, rather than as bunch of potential
* delimiter characters - in contrast to {@code tokenizeToStringArray}.
* @param str the input String
* @param delimiter the delimiter between elements (this is a single delimiter,
* rather than a bunch individual delimiter characters)
* @param charsToDelete a set of characters to delete. Useful for deleting unwanted
* line breaks: e.g. "\r\n\f" will delete all new lines and line feeds in a String.
* @return an array of the tokens in the list
* @see #tokenizeToStringArray
*/
public static String[] delimitedListToStringArray(String str, String delimiter, String charsToDelete) {
if (str == null) {
return new String[0];
}
if (delimiter == null) {
return new String[] {str};
}
List result = new ArrayList();
if ("".equals(delimiter)) {
for (int i = 0; i < str.length(); i++) {
result.add(deleteAny(str.substring(i, i + 1), charsToDelete));
}
}
else {
int pos = 0;
int delPos;
while ((delPos = str.indexOf(delimiter, pos)) != -1) {
result.add(deleteAny(str.substring(pos, delPos), charsToDelete));
pos = delPos + delimiter.length();
}
if (str.length() > 0 && pos <= str.length()) {
// Add rest of String, but not in case of empty input.
result.add(deleteAny(str.substring(pos), charsToDelete));
}
}
return toStringArray(result);
}
/**
* Convert a CSV list into an array of Strings.
* @param str the input String
* @return an array of Strings, or the empty array in case of empty input
*/
public static String[] commaDelimitedListToStringArray(String str) {
return delimitedListToStringArray(str, ",");
}
/**
* Convenience method to convert a CSV string list to a set.
* Note that this will suppress duplicates.
* @param str the input String
* @return a Set of String entries in the list
*/
public static Set commaDelimitedListToSet(String str) {
Set set = new TreeSet();
String[] tokens = commaDelimitedListToStringArray(str);
for (String token : tokens) {
set.add(token);
}
return set;
}
/**
* Convenience method to return a Collection as a delimited (e.g. CSV)
* String. E.g. useful for {@code toString()} implementations.
* @param coll the Collection to display
* @param delim the delimiter to use (probably a ",")
* @param prefix the String to start each element with
* @param suffix the String to end each element with
* @return the delimited String
*/
public static String collectionToDelimitedString(Collection coll, String delim, String prefix, String suffix) {
if (CollectionKit.isEmpty(coll)) {
return "";
}
StringBuilder sb = new StringBuilder();
Iterator it = coll.iterator();
while (it.hasNext()) {
sb.append(prefix).append(it.next()).append(suffix);
if (it.hasNext()) {
sb.append(delim);
}
}
return sb.toString();
}
/**
* Convenience method to return a Collection as a delimited (e.g. CSV)
* String. E.g. useful for {@code toString()} implementations.
* @param coll the Collection to display
* @param delim the delimiter to use (probably a ",")
* @return the delimited String
*/
public static String collectionToDelimitedString(Collection coll, String delim) {
return collectionToDelimitedString(coll, delim, "", "");
}
/**
* Convenience method to return a Collection as a CSV String.
* E.g. useful for {@code toString()} implementations.
* @param coll the Collection to display
* @return the delimited String
*/
public static String collectionToCommaDelimitedString(Collection coll) {
return collectionToDelimitedString(coll, ",");
}
/**
* Convenience method to return a String array as a delimited (e.g. CSV)
* String. E.g. useful for {@code toString()} implementations.
* @param arr the array to display
* @param delim the delimiter to use (probably a ",")
* @return the delimited String
*/
public static String arrayToDelimitedString(Object[] arr, String delim) {
if (ObjectKit.isEmpty(arr)) {
return "";
}
if (arr.length == 1) {
return ObjectKit.nullSafeToString(arr[0]);
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < arr.length; i++) {
if (i > 0) {
sb.append(delim);
}
sb.append(arr[i]);
}
return sb.toString();
}
/**
* Convenience method to return a String array as a CSV String.
* E.g. useful for {@code toString()} implementations.
* @param arr the array to display
* @return the delimited String
*/
public static String arrayToCommaDelimitedString(Object[] arr) {
return arrayToDelimitedString(arr, ",");
}
public enum SMSAuthCodeType{
Numbers,
CharAndNumbers,
}
public static String smsAuthCode(int codeLen){
return smsAuthCode(codeLen, SMSAuthCodeType.Numbers);
}
public static String smsAuthCode(int codeLen, SMSAuthCodeType type){
String randomCode = "";
String strTable = type == SMSAuthCodeType.Numbers ? "1234567890"
: "1234567890abcdefghijkmnpqrstuvwxyz";
int len = strTable.length();
boolean bDone = true;
do {
randomCode = "";
int count = 0;
for (int i = 0; i < codeLen; i++) {
double dblR = Math.random() * len;
int intR = (int) Math.floor(dblR);
char c = strTable.charAt(intR);
if (('0' <= c) && (c <= '9')) {
count++;
}
randomCode += strTable.charAt(intR);
}
if (count >= 2) {
bDone = false;
}
} while (bDone);
return randomCode.toUpperCase();
}
public static String randomStr(){
return UUID.randomUUID().toString().replace("-", "");
}
protected Strs() {
}
/**
* 是中文字符吗?
*
* @param c 待判定字符
* @return 判断结果
*/
public static boolean isChineseCharacter(char c) {
Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
return ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
|| ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS
|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION;
}
/**
* 判断字符是否为全角字符
*
* @param c 字符
* @return 判断结果
*/
public static boolean isFullWidthCharacter(char c) {
// 全角空格为12288，半角空格为32
// 其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
// 全角空格 || 其他全角字符
if (c == 12288 || (c > 65280 && c < 65375)) {
return true;
}
// 中文全部是全角
if (isChineseCharacter(c)) {
return true;
}
// 日文判断
// 全角平假名 u3040 - u309F
// 全角片假名 u30A0 - u30FF
return c >= '\u3040' && c <= '\u30FF';
}
/**
* 转换成半角字符
*
* @param c 待转换字符
* @return 转换后的字符
*/
public static char toHalfWidthCharacter(char c) {
if (c == 12288) {
return (char) 32;
} else if (c > 65280 && c < 65375) {
return (char) (c - 65248);
}
return c;
}
/**
* 转换为半角字符串
*
* @param str 待转换字符串
* @return 转换后的字符串
*/
public static String toHalfWidthString(CharSequence str) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < str.length(); i++) {
sb.append(toHalfWidthCharacter(str.charAt(i)));
}
return sb.toString();
}
/**
* 判断是否是全角字符串(所有字符都是全角)
*
* @param str 被判断的字符串
* @return 判断结果
*/
public static boolean isFullWidthString(CharSequence str) {
return charLength(str) == str.length() * 2;
}
/**
* 判断是否是半角字符串(所有字符都是半角)
*
* @param str 被判断的字符串
* @return 判断结果
*/
public static boolean isHalfWidthString(CharSequence str) {
return charLength(str) == str.length();
}
/**
* 计算字符串的字符长度(全角算2, 半角算1)
*
* @param str 被计算的字符串
* @return 字符串的字符长度
*/
public static int charLength(CharSequence str) {
int clength = 0;
for (int i = 0; i < str.length(); i++) {
clength += isFullWidthCharacter(str.charAt(i)) ? 2 : 1;
}
return clength;
}
/**
* 复制字符串
*
* @param cs 字符串
* @param num 数量
* @return 新字符串
*/
public static String dup(CharSequence cs, int num) {
if (isEmpty(cs) || num <= 0)
return "";
StringBuilder sb = new StringBuilder(cs.length() * num);
for (int i = 0; i < num; i++)
sb.append(cs);
return sb.toString();
}
/**
* 复制字符
*
* @param c 字符
* @param num 数量
* @return 新字符串
*/
public static String dup(char c, int num) {
if (c == 0 || num < 1)
return "";
StringBuilder sb = new StringBuilder(num);
for (int i = 0; i < num; i++)
sb.append(c);
return sb.toString();
}
/**
* 将字符串首字母大写
*
* @param s 字符串
* @return 首字母大写后的新字符串
* @deprecated 推荐使用 {@link #upperFirst(CharSequence)}
*/
public static String capitalize(CharSequence s) {
return upperFirst(s);
}
/**
* 将字符串首字母小写
*
* @param s 字符串
* @return 首字母小写后的新字符串
*/
public static String lowerFirst(CharSequence s) {
if (null == s)
return null;
int len = s.length();
if (len == 0)
return "";
char c = s.charAt(0);
if (Character.isLowerCase(c))
return s.toString();
return String.valueOf(Character.toLowerCase(c)) + s.subSequence(1, len);
}
/**
* 将字符串首字母大写
*
* @param s 字符串
* @return 首字母大写后的新字符串
*/
public static String upperFirst(CharSequence s) {
if (null == s)
return null;
int len = s.length();
if (len == 0)
return "";
char c = s.charAt(0);
if (Character.isUpperCase(c))
return s.toString();
return String.valueOf(Character.toUpperCase(c)) + s.subSequence(1, len);
}
/**
* 检查两个字符串的忽略大小写后是否相等.
*
* @param s1 字符串A
* @param s2 字符串B
* @return true 如果两个字符串忽略大小写后相等,且两个字符串均不为null
*/
public static boolean equalsIgnoreCase(String s1, String s2) {
return s1 == null ? s2 == null : s1.equalsIgnoreCase(s2);
}
/**
* 检查两个字符串是否相等.
*
* @param s1 字符串A
* @param s2 字符串B
* @return true 如果两个字符串相等,且两个字符串均不为null
*/
public static boolean equals(String s1, String s2) {
return s1 == null ? s2 == null : s1.equals(s2);
}
/**
* 判断字符串是否以特殊字符开头
*
* @param s 字符串
* @param c 特殊字符
* @return 是否以特殊字符开头
*/
public static boolean startsWithChar(String s, char c) {
return null != s && (s.length() != 0 && s.charAt(0) == c);
}
/**
* 判断字符串是否以特殊字符结尾
*
* @param s 字符串
* @param c 特殊字符
* @return 是否以特殊字符结尾
*/
public static boolean endsWithChar(String s, char c) {
return null != s && (s.length() != 0 && s.charAt(s.length() - 1) == c);
}
/**
* 如果此字符串为 null 或者为空串（""），则返回 true
*
* @param cs 字符串
* @return 如果此字符串为 null 或者为空，则返回 true
*/
public static boolean isEmpty(CharSequence cs) {
return null == cs || cs.length() == 0;
}
/**
* 如果此字符串为 null 或者全为空白字符，则返回 true
*
* @param cs 字符串
* @return 如果此字符串为 null 或者全为空白字符，则返回 true
*/
public static boolean isBlank(CharSequence cs) {
if (null == cs)
return true;
int length = cs.length();
for (int i = 0; i < length; i++) {
if (!(Character.isWhitespace(cs.charAt(i))))
return false;
}
return true;
}
/**
* 去掉字符串前后空白字符。空白字符的定义由Character.isWhitespace来判断
*
* @param cs 字符串
* @return 去掉了前后空白字符的新字符串
*/
public static String trim(CharSequence cs) {
if (null == cs)
return null;
int length = cs.length();
if (length == 0)
return cs.toString();
int l = 0;
int last = length - 1;
int r = last;
for (; l < length; l++) {
if (!Character.isWhitespace(cs.charAt(l)))
break;
}
for (; r > l; r--) {
if (!Character.isWhitespace(cs.charAt(r)))
break;
}
if (l > r)
return "";
else if (l == 0 && r == last)
return cs.toString();
return cs.subSequence(l, r + 1).toString();
}
/**
* 将给定字符串，变成 "xxx...xxx" 形式的字符串
*
* @param str 字符串
* @param len 最大长度
* @return 紧凑的字符串
*/
public static String brief(String str, int len) {
if (Strs.isBlank(str) || (str.length() + 3) <= len)
return str;
int w = len / 2;
int l = str.length();
return str.substring(0, len - w) + " ... " + str.substring(l - w);
}
/**
* 将字符串按半角逗号，拆分成数组，空元素将被忽略
*
* @param s 字符串
* @return 字符串数组
*/
public static String[] splitIgnoreBlank(String s) {
return Strs.splitIgnoreBlank(s, ",");
}
/**
* 根据一个正则式，将字符串拆分成数组，空元素将被忽略
*
* @param s 字符串
* @param regex 正则式
* @return 字符串数组
*/
public static String[] splitIgnoreBlank(String s, String regex) {
if (null == s)
return null;
String[] ss = s.split(regex);
List list = new LinkedList();
for (String st : ss) {
if (isBlank(st))
continue;
list.add(trim(st));
}
return list.toArray(new String[list.size()]);
}
/**
* 将一个整数转换成最小长度为某一固定数值的十进制形式字符串
*
* @param d 整数
* @param width 宽度
* @return 新字符串
*/
public static String fillDigit(int d, int width) {
return Strs.alignRight(String.valueOf(d), width, '0');
}
/**
* 将一个整数转换成最小长度为某一固定数值的十六进制形式字符串
*
* @param d 整数
* @param width 宽度
* @return 新字符串
*/
public static String fillHex(int d, int width) {
return Strs.alignRight(Integer.toHexString(d), width, '0');
}
/**
* 将一个整数转换成最小长度为某一固定数值的二进制形式字符串
*
* @param d 整数
* @param width 宽度
* @return 新字符串
*/
public static String fillBinary(int d, int width) {
return Strs.alignRight(Integer.toBinaryString(d), width, '0');
}
/**
* 将一个整数转换成固定长度的十进制形式字符串
*
* @param d 整数
* @param width 宽度
* @return 新字符串
*/
public static String toDigit(int d, int width) {
return Strs.cutRight(String.valueOf(d), width, '0');
}
/**
* 将一个整数转换成固定长度的十六进制形式字符串
*
* @param d 整数
* @param width 宽度
* @return 新字符串
*/
public static String toHex(int d, int width) {
return Strs.cutRight(Integer.toHexString(d), width, '0');
}
/**
* 将一个整数转换成固定长度的二进制形式字符串
*
* @param d 整数
* @param width 宽度
* @return 新字符串
*/
public static String toBinary(int d, int width) {
return Strs.cutRight(Integer.toBinaryString(d), width, '0');
}
/**
* 保证字符串为一固定长度。超过长度，切除左侧字符，否则左侧填补字符。
*
* @param s 字符串
* @param width 长度
* @param c 补字符
* @return 修饰后的字符串
*/
public static String cutRight(String s, int width, char c) {
if (null == s)
return null;
int len = s.length();
if (len == width)
return s;
if (len < width)
return Strs.dup(c, width - len) + s;
return s.substring(len - width, len);
}
/**
* 保证字符串为一固定长度。超过长度，切除右侧字符，否则右侧填补字符。
*
* @param s 字符串
* @param width 长度
* @param c 补字符
* @return 修饰后的字符串
*/
public static String cutLeft(String s, int width, char c) {
if (null == s)
return null;
int len = s.length();
if (len == width)
return s;
if (len < width)
return s + Strs.dup(c, width - len);
return s.substring(0, width);
}
/**
* 在字符串左侧填充一定数量的特殊字符
*
* @param o 可被 toString 的对象
* @param width 字符数量
* @param c 字符
* @return 新字符串
*/
public static String alignRight(Object o, int width, char c) {
if (null == o)
return null;
String s = o.toString();
int len = s.length();
if (len >= width)
return s;
return dup(c, width - len) + s;
}
/**
* 在字符串右侧填充一定数量的特殊字符
*
* @param o 可被 toString 的对象
* @param width 字符数量
* @param c 字符
* @return 新字符串
*/
public static String alignLeft(Object o, int width, char c) {
if (null == o)
return null;
String s = o.toString();
int length = s.length();
if (length >= width)
return s;
return s + dup(c, width - length);
}
/**
* 测试此字符串是否被指定的左字符和右字符所包裹；如果该字符串左右两边有空白的时候，会首先忽略这些空白
*
* @param cs 字符串
* @param lc 左字符
* @param rc 右字符
* @return 字符串是被左字符和右字符包裹
*/
public static boolean isQuoteByIgnoreBlank(CharSequence cs, char lc, char rc) {
if (null == cs)
return false;
int len = cs.length();
if (len < 2)
return false;
int l = 0;
int last = len - 1;
int r = last;
for (; l < len; l++) {
if (!Character.isWhitespace(cs.charAt(l)))
break;
}
if (cs.charAt(l) != lc)
return false;
for (; r > l; r--) {
if (!Character.isWhitespace(cs.charAt(r)))
break;
}
return l < r && cs.charAt(r) == rc;
}
/**
* 测试此字符串是否被指定的左字符和右字符所包裹
*
* @param cs 字符串
* @param lc 左字符
* @param rc 右字符
* @return 字符串是被左字符和右字符包裹
*/
public static boolean isQuoteBy(CharSequence cs, char lc, char rc) {
if (null == cs)
return false;
int length = cs.length();
return length > 1 && cs.charAt(0) == lc && cs.charAt(length - 1) == rc;
}
/**
* 测试此字符串是否被指定的左字符串和右字符串所包裹
*
* @param str 字符串
* @param l 左字符串
* @param r 右字符串
* @return 字符串是被左字符串和右字符串包裹
*/
public static boolean isQuoteBy(String str, String l, String r) {
return !(null == str || null == l || null == r) && str.startsWith(l) && str.endsWith(r);
}
/**
* 获得一个字符串集合中，最长串的长度
*
* @param coll 字符串集合
* @return 最大长度
*/
public static int maxLength(Collection coll) {
int re = 0;
if (null != coll)
for (CharSequence s : coll)
if (null != s)
re = Math.max(re, s.length());
return re;
}
/**
* 获得一个字符串数组中，最长串的长度
*
* @param array 字符串数组
* @return 最大长度
*/
public static int maxLength(T[] array) {
int re = 0;
if (null != array)
for (CharSequence s : array)
if (null != s)
re = Math.max(re, s.length());
return re;
}
/**
* 对指定对象进行 toString 操作；如果该对象为 null ，则返回空串（""）
*
* @param obj 指定的对象
* @return 对指定对象进行 toString 操作；如果该对象为 null ，则返回空串（""）
*/
public static String sNull(Object obj) {
return sNull(obj, "");
}
/**
* 对指定对象进行 toString 操作；如果该对象为 null ，则返回默认值
*
* @param obj 指定的对象
* @param def 默认值
* @return 对指定对象进行 toString 操作；如果该对象为 null ，则返回默认值
*/
public static String sNull(Object obj, String def) {
return obj != null ? obj.toString() : def;
}
/**
* 对指定对象进行 toString 操作；如果该对象为 null ，则返回空串（""）
*
* @param obj 指定的对象
* @return 对指定对象进行 toString 操作；如果该对象为 null ，则返回空串（""）
*/
public static String sBlank(Object obj) {
return sBlank(obj, "");
}
/**
* 对指定对象进行 toString 操作；如果该对象为 null 或者 toString 方法为空串（""），则返回默认值
*
* @param obj 指定的对象
* @param def 默认值
* @return 对指定对象进行 toString 操作；如果该对象为 null 或者 toString 方法为空串（""），则返回默认值
*/
public static String sBlank(Object obj, String def) {
if (null == obj)
return def;
String s = obj.toString();
return Strs.isBlank(s) ? def : s;
}
/**
* 截去第一个字符
*
* 比如:
*
* - removeFirst("12345") => 2345
*
- removeFirst("A") => ""
*
*
* @param str 字符串
* @return 新字符串
*/
public static String removeFirst(CharSequence str) {
if (str == null)
return null;
if (str.length() > 1)
return str.subSequence(1, str.length()).toString();
return "";
}
/**
* 如果str中第一个字符和 c一致,则删除,否则返回 str
*
* 比如:
*
* - removeFirst("12345",1) => "2345"
*
- removeFirst("ABC",'B') => "ABC"
*
- removeFirst("A",'B') => "A"
*
- removeFirst("A",'A') => ""
*
*
* @param str 字符串
* @param c 第一个个要被截取的字符
* @return 新字符串
*/
public static String removeFirst(String str, char c) {
return (Strs.isEmpty(str) || c != str.charAt(0)) ? str : str.substring(1);
}
/**
* 判断一个字符串数组是否包括某一字符串
*
* @param ss 字符串数组
* @param s 字符串
* @return 是否包含
*/
public static boolean isin(String[] ss, String s) {
if (null == ss || ss.length == 0 || Strs.isBlank(s))
return false;
for (String w : ss)
if (s.equals(w))
return true;
return false;
}
/**
* 检查一个字符串是否为合法的电子邮件地址
*
* @param input 需要检查的字符串
* @return true 如果是有效的邮箱地址
*/
public static boolean isEmail(String input) {
return !Strs.isBlank(input) && Validator.isEmail(input);
}
/**
* 将一个字符串由驼峰式命名变成分割符分隔单词
*
*
* lowerWord("helloWorld", '-') => "hello-world"
*
*
* @param cs 字符串
* @param c 分隔符
* @return 转换后字符串
*/
public static String lowerWord(CharSequence cs, char c) {
StringBuilder sb = new StringBuilder();
int len = cs.length();
for (int i = 0; i < len; i++) {
char ch = cs.charAt(i);
if (Character.isUpperCase(ch)) {
if (i > 0)
sb.append(c);
sb.append(Character.toLowerCase(ch));
} else {
sb.append(ch);
}
}
return sb.toString();
}
/**
* 将一个字符串某一个字符后面的字母变成大写，比如
*
*
* upperWord("hello-world", '-') => "helloWorld"
*
*
* @param cs 字符串
* @param c 分隔符
* @return 转换后字符串
*/
public static String upperWord(CharSequence cs, char c) {
StringBuilder sb = new StringBuilder();
int len = cs.length();
for (int i = 0; i < len; i++) {
char ch = cs.charAt(i);
if (ch == c) {
do {
i++;
if (i >= len)
return sb.toString();
ch = cs.charAt(i);
} while (ch == c);
sb.append(Character.toUpperCase(ch));
} else {
sb.append(ch);
}
}
return sb.toString();
}
/**
* 将一个字符串出现的HMTL元素进行转义，比如
*
*
* escapeHtml("<script>alert("hello world");</script>") => "<script>alert("hello world");</script>"
*
*
* 转义字符对应如下
*
* - & => &
*
- < => <
*
- >=> >
*
- ' => '
*
- " => "
*
*
* @param cs 字符串
* @return 转换后字符串
*/
public static String escapeHtml(CharSequence cs) {
if (null == cs)
return null;
char[] cas = cs.toString().toCharArray();
StringBuilder sb = new StringBuilder();
for (char c : cas) {
switch (c) {
case '&':
sb.append("&");
break;
case '<':
sb.append("<");
break;
case '>':
sb.append(">");
break;
case '\'':
sb.append("'");
break;
case '"':
sb.append(""");
break;
default:
sb.append(c);
}
}
return sb.toString();
}
/**
* 使用 UTF-8 编码将字符串编码为 byte 序列，并将结果存储到新的 byte 数组
*
* @param cs 字符串
* @return UTF-8编码后的 byte 数组
*/
public static byte[] getBytesUTF8(CharSequence cs) {
return cs.toString().getBytes(Charsets.UTF_8);
}
// ####### 几个常用的color相关的字符串转换放这里 ########
/**
* 将数字转为十六进制字符串, 默认要使用2个字符(暂时没考虑负数)
*
* @param n 数字
* @return 十六进制字符串
*/
public static String num2hex(int n) {
String s = Integer.toHexString(n);
return n <= 15 ? "0" + s : s;
}
/**
* 十六进制字符串转换为数字
*
* @param hex 十六进制字符串
* @return 十进制数字
*/
public static int hex2num(String hex) {
return Integer.parseInt(hex, 16);
}
/**
* 将一个字节数变成人类容易识别的显示字符串，比如 1.5M 等
*
* @param size 字节数
* @param SZU 千的单位，可能为 1024 或者 1000
* @return 人类容易阅读的字符串
*/
private static String _formatSizeForRead(long size, double SZU) {
if (size < SZU) {
return String.format("%d bytes", size);
}
double n = (double) size / SZU;
if (n < SZU) {
return String.format("%5.2f KB", n);
}
n = n / SZU;
if (n < SZU) {
return String.format("%5.2f MB", n);
}
n = n / SZU;
return String.format("%5.2f GB", n);
}
/**
* @see #_formatSizeForRead(long, double)
*/
public static String formatSizeForReadBy1024(long size) {
return _formatSizeForRead(size, 1024);
}
/**
* @see #_formatSizeForRead(long, double)
*/
public static String formatSizeForReadBy1000(long size) {
return _formatSizeForRead(size, 1000);
}
/**
* Stitching LIKE SQL percent.
*
* @param value value
* @return SQL LIKE expression.
*/
public static String like(String value) {
return StringPool.PERCENT + Strings.nullToEmpty(value) + StringPool.PERCENT;
}
/**
* Stitching LEFT LIKE SQL percent.
*
* @param value value
* @return SQL LIKE expression.
*/
public static String llike(String value) {
return StringPool.PERCENT + Strings.nullToEmpty(value);
}
/**
* Stitching Right LIKE SQL percent.
*
* @param value value
* @return SQL LIKE expression.
*/
public static String rlike(String value) {
return Strings.nullToEmpty(value) + StringPool.PERCENT;
}
}