中文与Unicode转换

package unicode;
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 = "配置成功，重启后生效";
  System.out.println("s1: " + s1);
 
  //转换汉字为Unicode码
  String s2 = "配置成功，重启后生效";
  s2 = CodeChange.stringToUnicode(s2);
  System.out.println("s2: " + s2);
  //转换Unicode码为汉字
  String s3 = CodeChange.unicodeToString(s2);
  System.out.println("s3: " + s3);
}


}