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java network programming TCP transmission establishment and basic idea analysis

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2018-07-28 11:08:591639browse

tcp transmission: Establish the client and server. After establishing the connection, transmit data through the IO stream in the Socket and close the socket.

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java network programming TCP transmission establishment and basic idea analysis##

package cn.hncu.tcp.show;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
//import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class MySocketServer {
  public static void main(String[] args) throws IOException {
	    ServerSocket ss=new ServerSocket(6666);
	    /*
		 * 服务器在等待客户端来握手(建立连接),这是一个阻塞方法,
		 * 如果没有客户端来握手则会一直处于等待状态。
		 * 若客户端来请求握手且成功,则会返回与对方(客户端)通讯的Socket s。
		 * 在后面就可以通过这个返回的s进行与这个客户端通讯
		 */
	    Socket s=ss.accept();
	    
		//程序若执行到这一句,则表示服务器端一定有一个客户端连接成功,且与对方通讯的Socket就是s
		System.out.println("2222222");
		
		//s中包含两个流: in, out
		//OutputStream out=s.getOutputStream();//通过out发数据给对方
		InputStream in=s.getInputStream();//通过in读取对方发来的数据
		
		//收数据
		DataInputStream din=new DataInputStream(in);
		String str=din.readUTF();
		System.out.println(str);
		
		din.close();
		in.close();
}
}
package cn.hncu.tcp.show;

import java.io.DataOutputStream;
import java.io.IOException;
//import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class MySocketClient {
	public static void main(String[] args) throws IOException {
		/*
		 * 客户端尝试向服务器进行握手,若超时则表示连接失败,抛出异常。 否则代码连接成功,后面的代码就可以通过s和服务器通讯
		 */
		Socket s = new Socket("127.0.0.1", 6666);

		// 程序执行到此,表示客户端一定与服务器端成功建立连接,否则上一句会出异常,不会执行到这里。
		System.out.println("11111111");

		// s中包含两个流: in, out
		OutputStream out = s.getOutputStream();// 通过out发数据给对方
		//InputStream in = s.getInputStream();// 通过in读取对方发来的数据

		// 向服务器发送数据
		String str = "Hello server!!! ";
		DataOutputStream dout = new DataOutputStream(out);
		dout.writeUTF(str);
		dout.close();
		out.close();

	}
}

java network programming TCP transmission establishment and basic idea analysis

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