Connection-based Java Network Programming

TCP-based Java Socket programming is implemented. The function is simple: the client outputs a "connect" to the server ", the server receives and sends a message "Hello" to the console. The client receives and outputs the message.

1. Server Side

Java code

1. Package e.net. socket;
3. Import java. io. DataInputStream;
4. Import java. io. DataOutputStream;
5. Import java. io. IOException;
6. Import java. io. InputStream;
7. Import java. io. OutputStream;
8. Import java.net. ServerSocket;
9. Import java.net. Socket;
11. Public class TCPServer {
12. Public static void main (String [] args ){
13. Try {
14. ServerSocket serverSocket = new ServerSocket (8888 );
15. Socket socket = serverSocket. accept ();
16. // Read client data
17. InputStream info = socket. getInputStream ();
18. DataInputStream dis = new DataInputStream (info );
19. System. out. println (dis. readUTF ());
21. // Output data to the client
22. OutputStream OS = socket. getOutputStream ();
23. DataOutputStream dos = new DataOutputStream (OS );
24. Dos. writeUTF ("Hello! ");
25. Dos. flush ();
26. } Catch (IOException e ){
27. E. printStackTrace ();
28. }
29. }
30. }

 

 

2. Client:

Java code

1. Package e.net. socket;
3. Import java. io. DataInputStream;
4. Import java. io. DataOutputStream;
5. Import java. io. IOException;
6. Import java. io. InputStream;
7. Import java. io. OutputStream;
8. Import java.net. Socket;
9. Import java.net. UnknownHostException;
11. Public class TCPClient {
12. Public static void main (String [] args ){
13. Try {
14. Socket socket = new Socket ("192.168.1.123", 8888 );
15. // Send data to the server
16. OutputStream OS = socket. getOutputStream ();
17. DataOutputStream bos = new DataOutputStream (OS );
18. Bos. writeUTF ("Connect ");
19. Bos. flush ();
21. // Receives server data
22. InputStream is = socket. getInputStream ();
23. DataInputStream dis = new DataInputStream (is );
24. System. out. println (dis. readUTF ());
25. } Catch (UnknownHostException e ){
26. E. printStackTrace ();
27. } Catch (IOException e ){
28. E. printStackTrace ();
29. }
30. }
31. }