Java实现中文UTF-8转换与16进制互转

package com.lqs;

 import java.io.File;   
 import java.io.FileOutputStream;   
 import java.io.UnsupportedEncodingException;   
  
  
 public class utf8 {   
    public static void main(String[] args) {   
        String str = "This is a test for *ÖÐÍø!@#$¡££¬£¿";   
        try {   
            File f = new File("D:/test.txt");   
            FileOutputStream fio = new FileOutputStream(f);   
            String s = gbToUtf8(str);   
            fio.write(s.getBytes("UTF-8"));   
            fio.close();           }   
        catch (Exception e) {   
            e.printStackTrace();   
        }   
    }   
  
    public static String gbToUtf8(String str) throws UnsupportedEncodingException {   
        StringBuffer sb = new StringBuffer();   
        for (int i = 0; i < str.length(); i++) {   
            String s = str.substring(i, i + 1);   
            if (s.charAt(0) > 0x80) {   
               byte[] bytes = s.getBytes("Unicode");              
               String binaryStr = "";   
                for (int j = 2; j < bytes.length; j += 2) {   
                     // the first byte