GBK与UTF-8 字符串互转

package com.cloud.tools;

 

import java.io.UnsupportedEncodingException;

 

/**

 * utf8 to gbk gbk to utf8

 * 

 * @author dell

 *

 */

public class Utf8ToGbk {

 

//utf-8 -> gbk

public static String utfToGbk(final String str) {

 

String utf8 = "";

String gbk = "";

try {

utf8 = new String(str.getBytes("UTF-8"));

//转为为unicode 字符串

String unicode = new String(utf8.getBytes(), "UTF-8");

gbk = new String(unicode.getBytes("GBK"));

 

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

 

return gbk;

 

}

 

//gbk -> utf-8

public static String gbkToUtf8(final String str) {

 

String utf8 = "";

try {

utf8 = new String(getUTF8BytesFromGBKString(str),"UTF-8");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

 

return utf8;

 

}

 

 

public static byte[] getUTF8BytesFromGBKString(String gbkStr) {  

        int n = gbkStr.length();  

        byte[] utfBytes = new byte[3 * n];  

        int k = 0;  

        for (int i = 0; i < n; i++) {  

            int m = gbkStr.charAt(i);  

            if (m < 128 && m >= 0) {  

                utfBytes[k++] = (byte) m;  

                continue;  

            }  

            utfBytes[k++] = (byte) (0xe0 | (m >> 12));  

            utfBytes[k++] = (byte) (0x80 | ((m >> 6) & 0x3f));  

            utfBytes[k++] = (byte) (0x80 | (m & 0x3f));  

        }  

        if (k < utfBytes.length) {  

            byte[] tmp = new byte[k];  

            System.arraycopy(utfBytes, 0, tmp, 0, k);  

            return tmp;  

        }  

        return utfBytes;  

    }  

 

public static void main(String[] args) {

 

System.out.println(utfToGbk("中文测试"));

 

System.out.println(gbkToUtf8("455测试中文"));

}

}