Java Charset, getBytes()

package com.cg.test;



import java.nio.charset.Charset;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;



import org.apache.commons.codec.binary.Hex;



public class HexString {



    /**

     * @param args

     */

    public static void main(String[] args) throws Exception {

	

	String s="1a国";

	System.out.println("原始字符串："+s);

	

	System.out.println(s.getBytes("ASCII").length);

	String sEncoded = Hex.encodeHexString(s.getBytes("ASCII"));

	System.out.println("ASCII: "+sEncoded);

	

	sEncoded = Hex.encodeHexString(s.getBytes("GBK"));

	System.out.println("GBK: "+sEncoded);



	System.out.println("Default charset: "+Charset.defaultCharset().name());

	sEncoded = Hex.encodeHexString(s.getBytes());

	System.out.println("Default: "+sEncoded);

	//output:3161e59bbd



	//BOM: Byte Order Mark 字节序标记

	sEncoded = Hex.encodeHexString(s.getBytes("UNICODE"));

	System.out.println("UNICODE: "+sEncoded);

//	output: feff0031006156fd

	

	sEncoded = Hex.encodeHexString(s.getBytes("UTF-16"));

	System.out.println("UTF-16: "+sEncoded);

	//output: feff0031006156fd

	

	sEncoded = Hex.encodeHexString(s.getBytes("x-UTF-16LE-BOM"));

	System.out.println("x-UTF-16LE-BOM: "+sEncoded);

	//output: fffe31006100fd56

	



	sEncoded = Hex.encodeHexString(s.getBytes("UTF-16BE"));

	System.out.println("UTF-16BE: "+sEncoded);

	//output: 0031006156fd

	

	sEncoded = Hex.encodeHexString(s.getBytes("UTF-16LE"));

	System.out.println("UTF-16LE: "+sEncoded);

	//output: 31006100fd56

	

	System.out.println("返回当前的 JVM 中可以使用的字符集");

	 Map m=Charset.availableCharsets();

         Set set=m.keySet();

         Iterator it=set.iterator();

         while(it.hasNext()){

                System.out.println(it.next());

         }

         

    }



}