org.iartisan.runtime.utils.StringUtils Maven / Gradle / Ivy
package org.iartisan.runtime.utils;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class StringUtils {
/**
* 下划线字符
*/
public static final char UNDERLINE = '_';
/**
* 空字符串
*/
public static final String EMPTY_STRING = "";
/**
*
* 判断字符串是否为空
*
*
* @param str 需要判断字符串
* @return 判断结果
*/
public static boolean isEmpty(String str) {
return str == null || EMPTY_STRING.equals(str.trim());
}
/**
*
* 判断字符串是否不为空
*
*
* @param str 需要判断字符串
* @return 判断结果
*/
public static boolean isNotEmpty(String str) {
return !isEmpty(str);
}
public static boolean isNotBlank(String str) {
return isNotEmpty(str);
}
public static boolean isBlank(String str) {
return isEmpty(str);
}
/**
*
* 字符串驼峰转下划线格式
*
*
* @param param 需要转换的字符串
* @return 转换好的字符串
*/
public static String camelToUnderline(String param) {
if (isEmpty(param)) {
return EMPTY_STRING;
}
int len = param.length();
StringBuilder sb = new StringBuilder(len);
for (int i = 0; i < len; i++) {
char c = param.charAt(i);
if (Character.isUpperCase(c) && i > 0) {
sb.append(UNDERLINE);
}
sb.append(Character.toLowerCase(c));
}
return sb.toString();
}
/**
*
* 字符串下划线转驼峰格式
*
*
* @param param 需要转换的字符串
* @return 转换好的字符串
*/
public static String underlineToCamel(String param) {
if (isEmpty(param)) {
return EMPTY_STRING;
}
int len = param.length();
StringBuilder sb = new StringBuilder(len);
for (int i = 0; i < len; i++) {
char c = param.charAt(i);
if (c == UNDERLINE) {
if (++i < len) {
sb.append(Character.toUpperCase(param.charAt(i)));
}
} else {
sb.append(c);
}
}
return sb.toString();
}
public static boolean isUpperCase(String str) {
return match("^[A-Z]+$", str);
}
/**
*
* 正则表达式匹配
*
*
* @param regex 正则表达式字符串
* @param str 要匹配的字符串
* @return 如果str 符合 regex的正则表达式格式,返回true, 否则返回 false;
*/
public static boolean match(String regex, String str) {
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(str);
return matcher.matches();
}
/**
*
* 使用单引号包含字符串
*
*
* @param obj 原字符串
* @return 单引号包含的原字符串
*/
public static String quotaMark(Object obj) {
String srcStr = String.valueOf(obj);
if (obj instanceof String && !srcStr.matches("\'(.+)\'")) {
return "\'" + srcStr + "\'";
}
return srcStr;
}
public static String concatCapitalize(String concatStr, final String str) {
if (isEmpty(concatStr)) {
concatStr = EMPTY_STRING;
}
int strLen;
if (str == null || (strLen = str.length()) == 0) {
return str;
}
final char firstChar = str.charAt(0);
if (Character.isTitleCase(firstChar)) {
// already capitalized
return str;
}
return new StringBuilder(strLen).append(concatStr).append(Character.toTitleCase(firstChar))
.append(str.substring(1)).toString();
}
public static String capitalize(final String str) {
return concatCapitalize(null, str);
}
}