编码学习

package practice.encode;

import java.io.UnsupportedEncodingException;

public class EncodeDemo {

	public static void main(String[] args) throws UnsupportedEncodingException {
		String s="心情ABC";
		byte[] byte1=s.getBytes();//转换为字节码数组用的是项目默认编码GBK
		for (byte b : byte1) {
			//GBK编码中文占用两个字节，英文占用一个字节
			System.out.print(Integer.toHexString(b &0xff)+"  ");

		}
		
		System.out.println();
		
		byte[] byte2=s.getBytes("utf-8");
		for (byte b : byte2) {
			//utf-8编码中文占用三个字节，英文占用一个字节
			System.out.print(Integer.toHexString(b &0xff)+"  ");
		}
		
		System.out.println();
		
		//Java是双字节编码 utf-16be
		byte[] byte3=s.getBytes("utf-16be");
		for (byte b : byte3) {
			//utf-16be编码中文占用两个字节，英文占用两个字节
			System.out.print(Integer.toHexString(b &0xff)+"  ");

		}
		
		System.out.println();
		
		String str1=new String(byte3);//字节码数组用的utf-16be编码，转换为字符串时用的默认编码GBK，出现乱码
		System.out.println(str1);
		
		String str2=new String(byte3,"utf-16be");//转换为字符串时也用utf-16be编码
		System.out.println(str2);

	}

}