第三篇 IO流技术

Posted 2021-01-01 zhangzhipeng001

编码和解码

package com.zzp.demo;

import java.io.UnsupportedEncodingException;

/**
 * 
 * 字符串到字节   -->  编码
 * @author java
 *
 */
public class ContentEncode {
    public static void main(String[] args) throws UnsupportedEncodingException {
        String msg = "我是中国人";
        byte[] datas = msg.getBytes();//默认是工程的字符集
        System.out.println(datas.length);
        
        //编码成其他的字符集
        datas = msg.getBytes("UTF-16LE");
        System.out.println(datas.length);
        
        datas = msg.getBytes("UTF-8");
        System.out.println(datas.length);
    }
}

package com.zzp.demo;

import java.io.UnsupportedEncodingException;

/**
 * 
 * 字节数组到字符串   --> 解码
 * @author java
 *
 */
public class ContentDecode {
    public static void main(String[] args) throws UnsupportedEncodingException {
        String msg = "我是中国人";
        byte[] datas = msg.getBytes();//默认是工程的字符集
        System.out.println(datas.length);
        //解码：字符串
        msg =new String(datas, 0, datas.length, "gbk");
        System.out.println(msg);
        
        //乱码
        //1、字节数不够
        msg = new String(datas, 0, datas.length-1, "gbk");
        System.out.println(msg);
        
        //2、字符集不统一
        msg = new String(datas, 0, datas.length, "utf8");
        System.out.println(msg);
    }
}