Java 16进制、unicode互转

package service;

import java.util.regex.Matcher;

import java.util.regex.Pattern;
public class CodeChange {
/*
*  把中文字符串转换为十六进制Unicode编码字符串
*/
public static String stringToUnicode(String s) {
String str = "";
for (int i = 0; i < s.length(); i++) {
int ch = (int) s.charAt(i);
if (ch > 255)
str += "\\u" + Integer.toHexString(ch);
else
str += "\\" + Integer.toHexString(ch);
}
return str;
}

/*
*  把十六进制Unicode编码字符串转换为中文字符串
*/
public static String unicodeToString(String str) {
Pattern pattern = Pattern.compile("(\\\\u(\\p{XDigit}{4}))");
Matcher matcher = pattern.matcher(str);
char ch;
while (matcher.find()) {
ch = (char) Integer.parseInt(matcher.group(2), 16);
str = str.replace(matcher.group(1), ch + "");
}
return str;
}

public static void main(String[] args) {
// 直接以Unicode字符串的方式初始化字符串时，会自动
String s1 = "\\测\\试\\数\\据\\！";
System.out.println("s1: " + s1);
//转换汉字为Unicode码
String s2 = "测试数据";
s2 = CodeChange.stringToUnicode(s2);
System.out.println("s2: " + s2);
//转换Unicode码为汉字
　　　　  String aaa ="\u4ec0\u4e48";
String s3 = CodeChange.unicodeToString(aaa);
System.out.println("s3: " + s3);
}
}