Java IO流(2)-字符集

编码
变长Unicode字符

UTF-8
字母 1个字节
汉字 3个字节

public class Encode {
    public static void main(String[] args) {
        String src="这是我的abc";
        byte[] bytes = src.getBytes();
        System.out.println(bytes.length);
    }
}

GBK
字母 1个字节
汉字 2个字节

import java.io.UnsupportedEncodingException;

public class Encode {
    public static void main(String[] args) throws UnsupportedEncodingException {
        String src="这是我的abc";
        byte[] bytes = src.getBytes();


        bytes = src.getBytes("GBK");
        System.out.println(bytes.length);
    }
}

解码

import java.io.UnsupportedEncodingException;

public class Encode {
    public static void main(String[] args) throws UnsupportedEncodingException {
        String src="这是我的abc";
        byte[] bytes = src.getBytes();

        String s;
        //解码
        s=new String(bytes,0,bytes.length,"utf-8");
        System.out.println(s);
    }
}

可能会遇到的问题

import java.io.UnsupportedEncodingException;

public class Encode {
    public static void main(String[] args) throws UnsupportedEncodingException {
        String src="这是我的abc";
        byte[] bytes = src.getBytes();

        String s;
        //解码
        //字符集不统一
        s=new String(bytes,0,bytes.length,"gbk");
        System.out.println(s);

        //字节数不够
        s=new String(bytes,0,bytes.length-1,"utf-8");
    }
}