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 ="u4ec0u4e48";
        String s3 = CodeChange.unicodeToString(aaa);
        System.out.println("s3: " + s3);
    }
}