Java TCP uses Socket for network communication (3)

Java TCP uses Socket for network communication (3)

 

This article demonstrates that TCP uses Socket for network communication, establishes a simple client, and sends a message to the server. After receiving the message, the server prints the data on the console.

1) the client sends a message to the server.

2) The server receives the message from the client and prints it on the console.

 

The client code is as follows:

 

Package tcp. clinet. qdj; import java. io. outputStream; import java.net. socket; // Tcp client public class CTcpClient {public static void main (String [] args) throws Exception {// create the Socket service of the client and specify the target host and port. Socket s = new Socket (127.0.0.1, 6877); System. out. println (the client has established a link...); // The output stream in the Socket stream should be obtained to send data. OutputStream out = s. getOutputStream (); out. write (Tcp data comes... getBytes (); // close resource s. close ();}}

Server, the Code is as follows:

 

 

Package tcp. server. qdj; import java. io. inputStream; import java.net. serverSocket; import java.net. socket; // Tcp Communication Server public class CServer {public static void main (String [] args) throws Exception {// establish the server socket service and listen to a port. ServerSocket ss = new ServerSocket (6877); // obtain the linked client Object System through the accept method. out. println (the server is started and listening to port 6876, waiting for data ...); socket s = ss. accept (); // obtain the ip address String ip address = s. getInetAddress (). getHostAddress (); System. out. println (ip + .... connected); // obtain the data sent from the client. Use the read stream of the client object to read the data. InputStream in = s. getInputStream (); byte [] buf = new byte [1024]; int len = in. read (buf); System. out. println (new String (buf, 0, len); // close the client s. close (); // closes the server (optional) ss. close ();}}

In this article, you must note that Tcp is connection-oriented data transmission. Therefore, you must first start the server and then enable the client to successfully connect to the server .....

 

In addition, when writing, I enter the IP address as my actual network IP address, so that no data can be accepted. If it is changed to 127.0.0.1, no problem will be solved.

Effect display:

1) Start the server

2) Start the client and send data

3) on the server side, after receiving the receipt...

References: Lecture on Java video Bi Xiangdong

Address: http://blog.csdn.net/qingdujun/article/details/39322051