src/util/Gb2312ToUtf.java

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package util;


import java.io.File;   
import java.io.FileOutputStream;   
import java.io.UnsupportedEncodingException;   
  
/**  
 * 2007-8-10 jyin at gomez dot com  
 */  
public class Gb2312ToUtf { 
    public static void main(String[] args) {   
        String str = "This is a test for *中网!@#$。，？";   
        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   
                    String hexStr = getHexString(bytes[j + 1]);   
                    String binStr = getBinaryString(Integer.valueOf(hexStr, 16));   
                    binaryStr += binStr;   
                    // the second byte   
                    hexStr = getHexString(bytes[j]);   
                    binStr = getBinaryString(Integer.valueOf(hexStr, 16));   
                    binaryStr += binStr;   
                }   
                // convert unicode to utf-8   
                String s1 = "1110" + binaryStr.substring(0, 4);   
                String s2 = "10" + binaryStr.substring(4, 10);   
                String s3 = "10" + binaryStr.substring(10, 16);   
                byte[] bs = new byte[3];   
                bs[0] = Integer.valueOf(s1, 2).byteValue();   
                bs[1] = Integer.valueOf(s2, 2).byteValue();   
                bs[2] = Integer.valueOf(s3, 2).byteValue();   
                String ss = new String(bs, "UTF-8");   
                sb.append(ss);   
            } else {   
                sb.append(s);   
            }   
        }   
        return sb.toString();   
    }   
  
    private static String getHexString(byte b) {