凯哥学堂

客户端代码:

package com.kaige123.net01;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
/**
*凯哥
*/
public class Client {

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

        // 如果对方服务器不存在就会报错
        Socket socket = new Socket("127.0.0.1", 8080); 
        InputStream input = socket.getInputStream();
        OutputStream output = socket.getOutputStream();

        output.write("你好服务器，我是凯哥，你还记得我吗？".getBytes());
        output.flush();//赶紧把内容输出到对方

        byte[] b=new byte[1024];
        int len=input.read(b);
        System.out.println("服务器说:"+new String(b,0,len));

        output.close();
        input.close();
        socket.close();

    }

}

服务端代码:

package com.kaige123.net01;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
*凯哥
*/
public class Server{

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

        // 如果都被占用 那就会抛异常
        // 建立好一个服务端 监听8080端口
        ServerSocket server = new ServerSocket(8080);

        // 等待客户端来连接服务器
        Socket socket = server.accept();  //代码运行到这句就会卡主 堵塞  等待

        InputStream input = socket.getInputStream();
        OutputStream output = socket.getOutputStream();

        byte[] b = new byte[1024 * 5];
        int len = input.read(b);
        String s = new String(b, 0, len);
        System.out.println(s);

        s = "你好凯哥，我是从东莞回来的美女!!";
        output.write(s.getBytes());

        output.close();
        input.close();
        socket.close();

    }
}