Simple TCP communication

Client code:

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();
		
	}

}

Server code:

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();

	}
}