package pack;

import java.io.UnsupportedEncodingException;

import java.lang.reflect.Array;

import java.util.Arrays;

public class Demo{

    /**

     *    用gbk编码 utf解码,然后再用utf编码 ,gbk解码,这样转不过来,因为gbk和utf-8里面都有中文,不过 iso8859-1可以

     */

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

        String s = "哈哈";

        byte[] b = s.getBytes("gbk");    //gbk编码

        System.out.println(Arrays.toString(b));

        String str = new String(b,"utf-8");    //utf-8解码

        System.out.println(str);

        b = str.getBytes("utf-8");

        System.out.println(Arrays.toString(b));

        str = new String(b,"gbk");

        System.out.println(str);

    }

}

package pack;

import java.io.UnsupportedEncodingException;

import java.lang.reflect.Array;

import java.util.Arrays;

/**

 * 把联通用gbk编码,然后把字节以二进制形式输出,是110开头,后面是10,所以系统就用utf-8去解码.

 * 这个是特例,输出二进制时候,前面有很多个1,是32位的,输出低4位,就&上255

 */

public class Demo{

    /**

     *    用gbk编码 utf解码,然后再用utf编码 ,gbk解码,这样转不过来,因为gbk和utf-8里面都有中文,不过 iso8859-1可以

     */

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

        String s = "联通";

        byte[] b = s.getBytes("gbk");    //gbk编码

        for (byte b1 : b) {

            System.out.println(Integer.toBinaryString(b1));

        }

        System.out.println(Arrays.toString(b));

        byte[] bb = s.getBytes("utf-8");    //gbk编码

        System.out.println(Arrays.toString(bb));

        for(byte b2:bb){

            System.out.println(Integer.toBinaryString(b2&));

        }

    }

}