Java TCP uses sockets for network communication (3)

Author: Ching

Original address: http://blog.csdn.net/qingdujun/article/details/39322051

This article demonstrates that TCP uses the socket for network communication, establishes a simple client, and uses the client to send a message to the server, which is then printed on the console after the service has received it.

1) The client sends a message to the server.

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

Client, the code is as follows:

[Java]View Plaincopyprint?

2. Package TCP.CLINET.QDJ;
6. Import Java.io.OutputStream;
8. Import Java.net.Socket;
10. Client of TCP Communication
12. Public class Ctcpclient {
16. public static void Main (string[] args) throws Exception {
18. //Create Client Socket service, specify destination host and port.
20. Socket s = new socket ("127.0.0.1",6877);
22. SYSTEM.OUT.PRINTLN ("Client has established a link ...");
24. //In order to send data, you should get the output stream in the socket stream.
26. OutputStream out = S.getoutputstream ();
28. Out.write ("TCP data Comes ...".)  GetBytes ());
30. //Close Resources
32. S.close ();
34. }
36. }

Service side, the code is as follows:

[Java]View Plaincopyprint?

2. Package TCP.SERVER.QDJ;
6. Import Java.io.InputStream;
8. Import Java.net.ServerSocket;
10. Import Java.net.Socket;
14. Service side of TCP communication
16. Public class Cserver {
20. public static void Main (string[] args) throws exception{
22. //Set up the server socket service and listen to a port.
24. ServerSocket ss = New ServerSocket (6877);
26. //Get the client object from the link through the Accept method
28. SYSTEM.OUT.PRINTLN ("Server is started, listening on port 6876, waiting for data ...");
30. Socket s = ss.accept ();
32. //Get an IP address
34. String IP = s.getinetaddress (). gethostaddress ();
36. System.out.println (ip+".... Connected");
38. //Get the data sent by the client, then use the read stream of the client's object to read the data .
40. InputStream in = S.getinputstream ();
42. byte[] buf = new byte[1024];
44. int len = In.read (BUF);
46. System.out.println (new String (buf,0,len));
48. //Close client
50. S.close ();
52. //Close the service side (optional)
54. Ss.close ();
56. }
58. }

It is important to note that TCP is a connection-oriented data transfer, so you need to start the server side before you open the client to successfully connect ....

In addition, I write the IP address as my actual network IP address, the occurrence of what data are not accepted. Change to 127.0.0.1 is no problem, to be solved.

Effect Show:

1) Start the service side

2) Start the client and send the data

3) server side, receipt after acceptance ...

References: Java video Bi Xiangdong presenter

Original address: http://blog.csdn.net/qingdujun/article/details/39322051

Java TCP uses sockets for network communication (3)