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Common utilities used by both Dao and Winlet project
package com.aggrepoint.utils;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.util.Calendar;
import java.util.Hashtable;
import java.util.Random;
import java.util.regex.Pattern;
/**
* 字符串处理工具方法
*
* @author JMYANG
*/
public class StringUtils {
static MessageDigest m_md5;
static {
try {
m_md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
}
}
/**
* MD5
*
* @param str
* @return
*/
public static String md5Encrypt(String str) {
byte[] bytes = null;
try {
bytes = str.getBytes("UTF-8");
} catch (Exception e) {
bytes = str.getBytes();
}
byte messageDigest[] = null;
synchronized (m_md5) {
m_md5.update(bytes);
messageDigest = m_md5.digest();
}
StringBuffer hexString = new StringBuffer();
int d;
for (int i = 0; i < messageDigest.length; i++) {
d = messageDigest[i];
if (d < 0)
d += 256;
if (d < 16)
hexString.append("0");
hexString.append(Integer.toHexString(d));
}
return hexString.toString();
}
/**
* MD5，并将结果反转以防破解
*
* @param str
* @return
*/
public static String md5EncryptReverse(String str) {
byte[] bytes = null;
try {
bytes = str.getBytes("UTF-8");
} catch (Exception e) {
bytes = str.getBytes();
}
byte messageDigest[] = null;
synchronized (m_md5) {
m_md5.update(bytes);
messageDigest = m_md5.digest();
}
StringBuffer hexString = new StringBuffer();
int d;
for (int i = messageDigest.length - 1; i >= 0; i--) {
d = messageDigest[i];
if (d < 0)
d += 256;
if (d < 16)
hexString.append("0");
hexString.append(Integer.toHexString(d));
}
return hexString.toString();
}
/**
* 字符串替换
*
* @param str
* String
* @param strReplace
* String
* @param strWith
* @return String
*/
static public String replaceString(String str, String strReplace,
String strWith) {
StringBuffer sb = new StringBuffer();
int iCurrent = 0;
int iFound;
int iReplaceLen = strReplace.length();
if (str == null || strReplace == null || strWith == null)
return str;
if (str.equals("") || strReplace.equals(""))
return str;
while (true) {
iFound = str.indexOf(strReplace, iCurrent);
if (iFound == -1) {
sb.append(str.substring(iCurrent));
break;
}
if (iFound != iCurrent)
sb.append(str.substring(iCurrent, iFound));
sb.append(strWith);
iCurrent = iFound + iReplaceLen;
}
return sb.toString();
}
/**
* 获取字符串在数据库中占据的字节长度
*
* @param str
* String 要处理的字符串
* @param n
* int 每个非拉丁字符在数据库中占据的字节数
*/
public static int getDBLength(String str, int n) {
if (str == null) {
return 0;
}
char[] chars = str.toCharArray();
int len = 0;
for (int i = 0; i < chars.length; i++) {
if (Character.UnicodeBlock.of(chars[i]) == Character.UnicodeBlock.BASIC_LATIN) {
len++;
} else {
len += n;
}
}
return len;
}
/**
* 将超出长度的字符截去。
*
* @param str
* String 要处理的字符串
* @param dbLen
* int 长度
* @param n
* int 每个非拉丁字符在数据库中占据的字节数
*/
public static String fixDBString(String str, int dbLen, int n) {
if (str == null) {
return "";
}
char[] chars = str.toCharArray();
int len = 0;
StringBuffer sb = new StringBuffer();
for (int i = 0; i < chars.length; i++) {
if (Character.UnicodeBlock.of(chars[i]) == Character.UnicodeBlock.BASIC_LATIN) {
len++;
} else {
len += n;
}
if (len > dbLen) {
break;
}
sb.append(chars[i]);
}
return sb.toString();
}
/**
* 将超出长度的字符串截去。 处理后的字符串可以用来准备PreparedStatement。
*
* @param str
* String 要处理的字符串，可以为null
* @param dbLen
* int 长度
*/
public static String fixLen(String str, int dbLen, int n) {
if (str == null)
return null;
if (str.length() * n < dbLen)
return str;
char[] chars = str.toCharArray();
int len = 0;
StringBuffer sb = new StringBuffer();
for (int i = 0; i < chars.length; i++) {
if (Character.UnicodeBlock.of(chars[i]) == Character.UnicodeBlock.BASIC_LATIN) {
len++;
} else {
len += n;
}
if (len > dbLen) {
break;
}
sb.append(chars[i]);
}
return sb.toString();
}
/**
* 获取字符串前len个字符。若字符串长度长于len，则后面用省略号代替。
*
* @param str
* @param len
* @param c
* 省略号字符
* @return
*/
public static String getBrief(String str, int len, char c) {
if (str == null)
return "";
if (str.length() < len)
return str;
return new StringBuffer(str.substring(0, len - 3)).append(c).append(c)
.append(c).toString();
}
/**
* 获取字符串前len个字符。若字符串长度长于len，则后面用英文省略号代替。
*
* @param str
* @param len
* @return
*/
public static String getBrief(String str, int len) {
return getBrief(str, len, '.');
}
/**
* 将Unicode的Byte Array转换为Java字符串
*
* @param ba
* byte[] Unicode的Byte Array
* @return String 转换结果
*/
public static String strFromUnicodeByteArray(byte[] ba, int len) {
if (ba == null) {
return "";
}
byte[] newBa = new byte[len];
for (int i = 0; i < len; i++)
newBa[i] = ba[i];
StringBuffer sb = new StringBuffer();
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(
newBa));
while (true) {
try {
char c = dis.readChar();
sb.append(c);
} catch (Exception e) {
break;
}
}
return sb.toString();
}
/**
* 将Java字符串转换为Unicode的Byte Array。
*
* @param str
* String 要转换的字符串
* @return byte[] 转换结果
*/
public static byte[] getUnicodeByteArray(String str) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
for (int i = 0; i < str.length(); i++) {
dos.writeChar((int) str.charAt(i));
}
} catch (Exception e) {
}
return baos.toByteArray();
}
protected static void appendWMLUnicodeToStringBuffer(StringBuffer sb,
byte[] ba) {
int b;
for (int i = 0; i < ba.length; i += 2) {
sb.append("&#x");
b = ba[i] >= 0 ? ba[i] : 256 + ba[i];
if (b < 16)
sb.append("0");
sb.append(Integer.toHexString(b));
b = ba[i + 1] >= 0 ? ba[i + 1] : 256 + ba[i + 1];
if (b < 16)
sb.append("0");
sb.append(Integer.toHexString(b));
sb.append(";");
}
}
public static String getWMLUnicodeString(String str) {
StringBuffer sb = new StringBuffer();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
char c;
try {
for (int i = 0; i < str.length(); i++) {
c = str.charAt(i);
if (Character.UnicodeBlock.of(c) != Character.UnicodeBlock.BASIC_LATIN) {
// 不是基本的英文字符
dos.writeChar((int) c);
} else { // 基本英文字符
if (baos.size() != 0) { // 前面已经有非英文字符出现
appendWMLUnicodeToStringBuffer(sb, baos.toByteArray());
baos.reset();
}
sb.append(c);
}
}
if (baos.size() != 0)
appendWMLUnicodeToStringBuffer(sb, baos.toByteArray());
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
/**
* 将指定的字符串str按charCount个字符为一段进行分段，取出第part段。 part从1开始 如果指定的分段不存在，则返回null。
*/
static public String getSlice(String str, int charCount, int part) {
if (str == null)
return null;
int len = str.length();
int iFrom = charCount * (part - 1);
if (iFrom >= len)
return null;
int iTo = iFrom + charCount;
if (iTo > len)
iTo = len;
return str.substring(iFrom, iTo);
}
/**
* 将Exception的Stack Trace转为字符串
*/
static public String getStackTrace(Exception e) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos);
e.printStackTrace(ps);
ps.flush();
try {
return baos.toString("UTF-8");
} catch (UnsupportedEncodingException ee) {
return baos.toString();
}
}
final static byte[] RANDOM_KEY_CHARACTER_SET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
.getBytes();
final static Random m_rn = new Random();
public static String getRandomKey(int keyLength) {
byte[] result = new byte[keyLength];
for (int i = 0; i < keyLength; i++)
result[i] = RANDOM_KEY_CHARACTER_SET[m_rn
.nextInt(RANDOM_KEY_CHARACTER_SET.length)];
return new String(result);
}
public static String toHTMLString(String org) {
StringBuffer result = new StringBuffer(org.length());
char[] chars = org.toCharArray();
for (int i = 0; i < chars.length; i++) {
if (chars[i] == '\"')
result.append(""");
else if (chars[i] == '<')
result.append("<");
else if (chars[i] == '>')
result.append(">");
else if (chars[i] == '&')
result.append("&");
else
result.append(chars[i]);
}
return result.toString();
}
public static String toHTML(String org, boolean inputValue) {
StringBuffer result = new StringBuffer(org.length());
char[] chars = org.toCharArray();
for (int i = 0; i < chars.length; i++) {
if (chars[i] == '\"')
result.append(""");
else if (chars[i] == '<')
result.append("<");
else if (chars[i] == '>')
result.append(">");
else if (chars[i] == '&')
result.append("&");
else if (chars[i] == '\r') {
if (inputValue)
result.append(chars[i]);
else {
result.append("
");
if (i + 1 < chars.length && chars[i + 1] == '\n')
i++;
}
} else if (chars[i] == '\n') {
if (inputValue)
result.append(chars[i]);
else
result.append("
");
} else if (chars[i] == ' ')
if (inputValue)
result.append(chars[i]);
else
result.append(" ");
else
result.append(chars[i]);
}
return result.toString();
}
public static String toHTML(String org) {
return toHTML(org, false);
}
public static String toWML(String org) {
StringBuffer result = new StringBuffer(org.length());
char[] chars = org.toCharArray();
for (int i = 0; i < chars.length; i++) {
if (chars[i] == '\"')
result.append(""");
else if (chars[i] == '<')
result.append("<");
else if (chars[i] == '>')
result.append(">");
else if (chars[i] == '&')
result.append("&");
else if (chars[i] == '\r') {
result.append("
");
if (i + 1 < chars.length && chars[i + 1] == '\n')
i++;
} else if (chars[i] == '\n')
result.append("
");
else if (chars[i] == ' ')
result.append(" ");
else
result.append(chars[i]);
}
return result.toString();
}
public static String toXMLString(String org) {
if (org == null)
return "";
StringBuffer result = new StringBuffer(org.length());
char[] chars = org.toCharArray();
for (int i = 0; i < chars.length; i++) {
if (chars[i] == '<')
result.append("<");
else if (chars[i] == '>')
result.append(">");
else if (chars[i] == '&')
result.append("&");
else if (chars[i] == '\r')
result.append("
");
else if (chars[i] == '\n')
result.append("
");
else if (chars[i] == '\"')
result.append(""");
else
result.append(chars[i]);
}
return result.toString();
}
public static String toJson(String org) {
StringBuffer result = new StringBuffer(org.length());
char[] chars = org.toCharArray();
for (int i = 0; i < chars.length; i++) {
if (chars[i] == '\"')
result.append(""");
else if (chars[i] == '\'')
result.append("'");
else if (chars[i] == '\\')
result.append("\");
else if (chars[i] == '\r') {
result.append("\\r");
} else if (chars[i] == '\n')
result.append("\\n");
else
result.append(chars[i]);
}
return result.toString();
}
public static String fixJson(String org) {
if (org == null)
return org;
org = org.replaceAll("<", "<").replaceAll(">", ">")
.replaceAll(""", "\\\\\"").replaceAll(" ", " ")
.replaceAll("&", "&");
return org;
}
/**
* Jackson生成的JSON字符串中，如果值里面有<>，直接将JSON写入页面中会造成错误，需要进行转码
* 应该用于所有会被直接写入页面中供页面里JS代码使用的JSON字符串
*
* @return
*/
public static String escapeAngleBracketsInJson(String json) {
if (json == null)
return null;
return json.replaceAll("<", "\\\\<").replaceAll(">", "\\\\>");
}
/**
* 将以yyyy-MM-dd形式的字符串转换为Calendar对象
*
* @param time
* 时间字符串
* @param sep
* 分隔符号
* @param isStart
* 为true表示时、分、秒、毫秒都取0，为false表示取最后一刻
*/
public static Calendar getCalendar(String time, char sep, boolean isStart) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, isStart ? 0 : 23);
cal.set(Calendar.MINUTE, isStart ? 0 : 59);
cal.set(Calendar.SECOND, isStart ? 0 : 59);
cal.set(Calendar.MILLISECOND, isStart ? 0 : 999);
try {
int idx = time.indexOf(sep);
if (idx != -1) {
cal.set(Calendar.YEAR, Integer.parseInt(time.substring(0, idx)));
time = time.substring(idx + 1);
idx = time.indexOf(sep);
if (idx != -1) {
cal.set(Calendar.MONTH,
Integer.parseInt(time.substring(0, idx)) - 1);
cal.set(Calendar.DAY_OF_MONTH,
Integer.parseInt(time.substring(idx + 1)));
}
}
} catch (Exception e) {
e.printStackTrace();
}
return cal;
}
public static String toDbMatch(String str) {
if (str == null)
str = "";
return "%" + str + "%";
}
public static String toDbMatch(String str, String escape) {
if (escape == null)
return toDbMatch(str);
if (str == null)
str = "";
str = str
.replaceAll(escape.equals("\\") ? escape + escape : escape,
escape + escape).replaceAll("%", escape + "%")
.replaceAll("_", escape + "_");
return "%" + str + "%";
}
public static String removeDbMatch(String str) {
if (str == null)
return "";
if (str.startsWith("%"))
str = str.substring(1);
if (str.endsWith("%"))
str = str.substring(0, str.length() - 1);
return str;
}
public static String wrap(String str, int width) {
if (str == null || width <= 0 || str.length() <= width)
return str;
char[] chars = str.toCharArray();
width = width * 2;
int c = 0;
StringBuffer sb = new StringBuffer();
for (int i = 0; i < chars.length; i++) {
if (Character.UnicodeBlock.of(chars[i]) == Character.UnicodeBlock.BASIC_LATIN)
c++;
else
c += 2;
sb.append(chars[i]);
if (c >= width) {
c = 0;
sb.append("
");
}
}
return sb.toString();
}
public static class TruncateResult {
public String str;
public boolean bTruncated;
public TruncateResult(String str, boolean truncated) {
this.str = str;
bTruncated = truncated;
}
}
public static TruncateResult truncate(String str, int width) {
if (str == null || width <= 0 || str.length() <= width)
return new TruncateResult(str, false);
char[] chars = str.toCharArray();
width = width * 2 - 3;
int c = 0;
StringBuffer sb = new StringBuffer();
for (int i = 0; i < chars.length; i++) {
if (Character.UnicodeBlock.of(chars[i]) == Character.UnicodeBlock.BASIC_LATIN)
c++;
else
c += 2;
sb.append(chars[i]);
if (c >= width) {
sb.append("...");
return new TruncateResult(sb.toString(), true);
}
}
return new TruncateResult(sb.toString(), false);
}
public static boolean equals(String str1, String str2) {
if (str1 == null && str2 == null)
return true;
if (str1 == null || str2 == null)
return false;
return str1.equals(str2);
}
/**
* 首字母大写
*/
public static String capitalize(String str) {
if (str == null || str.equals(""))
return str;
return str.substring(0, 1).toUpperCase() + str.substring(1);
}
/**
* 每个word的首字母都大写
*/
public static String capitalizeWords(String str) {
if (str == null || str.equals(""))
return str;
String[] words = str.split("[\\s\\r\\n\\t]+");
if (words == null || words.length == 0)
return "";
StringBuffer sb = new StringBuffer();
for (int i = 0; i < words.length; i++) {
if (i > 0)
sb.append(" ");
sb.append(capitalize(words[i]));
}
return sb.toString();
}
public static String join(String[] arr, String join, boolean trim,
boolean excludeEmpty, boolean capitalizedWord) {
if (arr == null)
return null;
StringBuffer sb = new StringBuffer();
boolean first = true;
for (String s : arr) {
if (trim)
s = s.trim();
if (excludeEmpty && isEmpty(s))
continue;
if (!first)
sb.append(join);
sb.append(capitalizedWord ? capitalizeWords(s) : s);
first = false;
}
return sb.toString();
}
/**
* 把str按splitRegexp进行拆分后，用join作为连接拼接在一起
*/
public static String canonicalize(String str, String splitRegexp,
String join, boolean trim, boolean excludeEmpty,
boolean capitalizeWord) {
if (str == null)
return null;
return join(str.split(splitRegexp), join, trim, excludeEmpty,
capitalizeWord);
}
public static String appendUrl(String str1, String str2) {
if (str1 == null || str1.equals(""))
return str2;
if (str2 == null || str2.equals(""))
return str1;
if (str1.endsWith("/") && str2.startsWith("/")) {
return str1 + str2.substring(1);
}
if (!str1.endsWith("/") && !str2.startsWith("/"))
return str1 + "/" + str2.substring(1);
return str1 + str2;
}
public static int countMatches(String main, String sub) {
if (main == null || sub == null || main.length() == 0
|| sub.length() == 0)
return 0;
int idx = 0;
int count = 0;
int len = sub.length();
idx = main.indexOf(sub, idx);
while (idx >= 0) {
count++;
idx += len;
idx = main.indexOf(sub, idx);
}
return count;
}
public static String getFirstNotEmpty(String... args) {
for (String str : args) {
if (str != null && !"".equals(str.trim()))
return str;
}
return null;
}
public static boolean isEmpty(String str) {
return str == null || str.trim().equals("");
}
public static boolean notEmpty(String str) {
return str != null && !str.trim().equals("");
}
// 这个Pattern太严格。没有找到简单的pattern，放松检查，只要在中间包含一个@就可以
static final Pattern EMAIL = Pattern
.compile("^[\\w-\\.]+@([\\w-]+\\.)+[\\w-]+$");
public static boolean isEmail(String str) {
if (str == null)
return false;
str = str.trim();
int len = str.length();
int idx = str.indexOf("@");
if (idx <= 0 || idx == len - 1)
return false;
if (str.indexOf("@", idx + 1) > 0)
return false;
if (str.indexOf(".", idx + 1) < 0)
return false;
return true;
}
public static Hashtable getHashParamsFromUrl(String url) {
Hashtable ht = new Hashtable();
if (url == null)
return ht;
int idx = url.indexOf("#");
if (idx < 0)
return ht;
for (String str : url.substring(idx + 1).split("&")) {
idx = str.indexOf("=");
if (idx > 0)
ht.put(str.substring(0, idx), str.substring(idx + 1));
}
return ht;
}
public static String inputStreamToString(final InputStream is) {
final char[] buffer = new char[10240];
final StringBuilder out = new StringBuilder();
try (Reader in = new InputStreamReader(is, "UTF-8")) {
for (;;) {
int rsz = in.read(buffer, 0, buffer.length);
if (rsz < 0)
break;
out.append(buffer, 0, rsz);
}
} catch (UnsupportedEncodingException ex) {
} catch (IOException ex) {
}
return out.toString();
}
public static String less(String str, int maxLen) {
if (str == null || str.length() < maxLen)
return str;
str = str.substring(0, maxLen);
int idx = str.lastIndexOf(" ");
if (idx > 0)
return str.substring(0, idx) + " ...";
return str + " ...";
}
public static Integer toInteger(String str) {
try {
return Integer.parseInt(str);
} catch (Exception e) {
return null;
}
}
}
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