java使用ServerSocket和Socket实现客户端与服务端通讯

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
 
public class demo_sever {
    public static void main(String[] args) throws IOException {
        ServerSocket ss=new ServerSocket(8888);
        Socket a1 = ss.accept();
        InputStream is = a1.getInputStream();
        byte[] bytes = new byte[1024];
        int len=is.read(bytes);
        System.out.println(new String(bytes,0,len));
        OutputStream os = a1.getOutputStream();
        os.write("adfasdfa".getBytes());
        a1.close();
        ss.close();
 
    }
}

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
 
public class demo {
    public static void main(String[] args) throws IOException {
        Socket sc=new Socket("127.0.0.1",8888);
        OutputStream Out = sc.getOutputStream();
        Out.write("你好，服务器!".getBytes());
        InputStream is = sc.getInputStream();
        byte[] bytes=new byte[1024];
        int len=is.read(bytes);
        System.out.println(new String(bytes,0,len));
        sc.close();
    }
}

服务端显示
你好，服务器!
客户端显示
adfasdfa