字符串编码的转换

package com.jdk7.chapter5;

import java.io.UnsupportedEncodingException;

public class ChangeCharsetTest {
    //公共的唯一静态变量
    public static final String US_ASCII = "US-ASCII";
    public static final String ISO_8859_1 = "ISO-8859-1";
    public static final String UTF_8 = "UTF-8";
    public static final String UTF_16BE = "UTF-16BE";
    public static final String UTF_16LE = "UTF-16LE";
    public static final String UTF_16 = "UTF-16";
    public static final String GBK = "GBK";
    
    public String toUS_ASCII(String str) throws UnsupportedEncodingException{
        return changeCharset(str, this.US_ASCII);
    }
    
    public String toISO_8859(String str) throws UnsupportedEncodingException{
        return changeCharset(str, this.ISO_8859_1);
    }
    
    public String toUTF_8(String str) throws UnsupportedEncodingException{
        return changeCharset(str, this.UTF_8);
    }
    
    public String toUTF_16BE(String str) throws UnsupportedEncodingException{
        return changeCharset(str, this.UTF_16BE);
    }
    
    public String toUTF_16LE(String str) throws UnsupportedEncodingException{
        return changeCharset(str, this.UTF_16LE);
    }
    
    public String toUTF_16(String str) throws UnsupportedEncodingException{
        return changeCharset(str, this.UTF_16);
    }
    
    public String toGBK(String str) throws UnsupportedEncodingException{
        return changeCharset(str, this.GBK);
    }
    
    public String changeCharset(String str, String newCharset) throws UnsupportedEncodingException{
        byte[] bt = str.getBytes();
        return new String(bt, newCharset);
    }
    
    public String changeCharset(String str, String newCharset, String oldCharset) throws UnsupportedEncodingException{
        byte[] bt = str.getBytes(oldCharset);
        return new String(bt, newCharset);
    }
    
    public static void main(String[] args) throws UnsupportedEncodingException {
        ChangeCharsetTest cct = new ChangeCharsetTest();
        String str = "This is 中文 charset!";
        System.out.println("cct.toUS_ASCII("+str+")>"+cct.toUS_ASCII(str));
        System.out.println("cct.toGBK("+str+")>"+cct.toGBK(str));
        System.out.println("cct.toISO_8859("+str+")>"+cct.toISO_8859(str));
        System.out.println("cct.toUTF_16("+str+")>"+cct.toUTF_16(str));
        System.out.println("cct.toUTF_16BE("+str+")>"+cct.toUTF_16BE(str));
        System.out.println("cct.toUTF_16LE("+str+")>"+cct.toUTF_16LE(str));
        System.out.println("cct.toUTF_8("+str+")>"+cct.toUTF_8(str));
        System.out.println("GBK to ISO_8859_1>"+cct.changeCharset(str, GBK, ISO_8859_1));
        System.out.println("GBK to US_ASCII>"+cct.changeCharset(str, GBK, US_ASCII));
        System.out.println("GBK to UTF_16>"+cct.changeCharset(str, GBK, UTF_16));
        System.out.println("GBK to UTF_16BE>"+cct.changeCharset(str, GBK, UTF_16BE));
        System.out.println("GBK to UTF_16LE>"+cct.changeCharset(str, GBK, UTF_16LE));
        System.out.println("GBK to UTF_8>"+cct.changeCharset(str, GBK, UTF_8));
    }
}

执行结果：
cct.toUS_ASCII(This is 中文 charset!)>This is ???? charset!
cct.toGBK(This is 中文 charset!)>This is 中文 charset!
cct.toISO_8859(This is 中文 charset!)>This is ???? charset!
cct.toUTF_16(This is 中文 charset!)>周楳?猠???桡牳整?
cct.toUTF_16BE(This is 中文 charset!)>周楳?猠???桡牳整?
cct.toUTF_16LE(This is 中文 charset!)>桔獩椠???挠慨獲瑥?
cct.toUTF_8(This is 中文 charset!)>This is ???? charset!
GBK to ISO_8859_1>This is ?? charset!
GBK to US_ASCII>This is ?? charset!
GBK to UTF_16>?