编码与解码基础

package com.cyj.Convert;

import java.io.UnsupportedEncodingException;

public class ConvertBase {
	
	public static void main(String[] args) throws UnsupportedEncodingException {
		
		String str = "我们又是冠军！";
		byte[] data = str.getBytes();
		
		//字节数不完整，长度丢失，造成乱码
		System.out.println(new String(data,0,3));
				
		bianma();
	}

	
	/**
	 * 编码与解码集需要统一
	 * @throws UnsupportedEncodingException
	 */
	public static void bianma() throws UnsupportedEncodingException {
		
		//解码byte ——> char
		String str = "我们又是冠军！"; //默认的gbk  在exlipes中依次点击状态栏Windows，preference，general，workpeace就会发现默认编码解码的方式
		
		//编码char ——> byte
		byte[] data = str.getBytes();
		System.out.println(new String(data));//重新对字节装换为字符，都是采用默认的
		
		data =  str.getBytes("utf-8"); //将编码字符集设为utf-8
		System.out.println(new String(data));//解码还是默认的gbk 输出时乱码
		
		System.out.println(new String(data,"utf-8"));//解码设定为utf-8，编码解码集相同，输出正确
		
	}
}