Java UDP uses sockets for network communication (0)

Author: Ching

Original address: http://blog.csdn.net/qingdujun/article/details/39300293

The following shows a program that uses a client to send a message to the server, which is printed on the control Panel after it is received.

1) client, send data to server

2) server, after receiving the data, print it on the control Panel

First, the client, the main steps:

1) Create a UDP service. Through the Datagramsocket object.

2) Create the data and encapsulate it into a packet.

3) Send the existing data packets through the socket service. by send mode.

4) Close the resource.

Client, send data code as follows:

[Java]View Plaincopyprint?

2. Package UDP.SEND.QDJ;
6. Import Java.net.DatagramPacket;
8. Import Java.net.DatagramSocket;
10. Import java.net.InetAddress;
12. UDP Send Side
14. Public class Cudpsend {
18. public static void Main (string[] args) throws Exception {
20. //1. Create a UDP service.  Through the Datagramsocket object.
22. Datagramsocket ds = new Datagramsocket (1234);
24. //2. Create the data and encapsulate it into a packet.
26. //datagrampacket (byte[] buf, int length, inetaddress address, int port)
28. //Constructs a datagram package that is used to send packets of length to the specified port number on the specified host.
30. byte[] buf = "UDP send from Server". GetBytes ();
32. Datagrampacket DP = new Datagrampacket (buf, Buf.length,inetaddress.getbyname ("10.100.56.210"),10000);
34. //3. Send the existing data packets through the socket service.  by send mode.
36. Ds.send (DP);
38. //4. Closing Resources
40. Ds.close ();
42. }
44. }

Second, the server side, the main steps are as follows:

1) Create the UDP Socket and set up the endpoint. Listening to a port, in fact, is to give this network program a digital indicator, convenient and clear, which data the application can handle.

2) define the packet. Used to store data.

3) The received data is stored in the packet via the Receive method of the service.

4) Get the data in the data packet method.

5) Close the resource.

Server side, accept the data and print it on the control Panel, the code is as follows:

[Java]View Plaincopyprint?

2. Package UDP.RECE.QDJ;
6. Import Java.net.DatagramPacket;
8. Import Java.net.DatagramSocket;
12. UDP Receive End
14. Public class Cudprece {
18. public static void Main (string[] args) throws exception{
20. //1. Create a UDP Socket to establish an endpoint. Listening to a port, in fact, is to give this network program a digital indicator,
22. //convenient with clear, which data the application can handle.
24. Datagramsocket ds = new Datagramsocket (10000);
26. //2. Define the packet.  Used to store data.
28. byte[] buf = new byte[1024];
30. Datagrampacket DP = new Datagrampacket (buf,buf.length);
32. //3. The received data is stored in a packet through the receive method of the service.
34. //This method is a blocking method and is blocked when no data is accepted.
36. Ds.receive (DP);
38. //4. Gets the data in the data packet method.
40. //Get an IP address
42. String IP = dp.getaddress (). gethostaddress ();
44. //Get Transfer data
46. String data = new String (Dp.getdata (),0,dp.getlength ());
48. //Get port number
50. int port = Dp.getport ();
52. SYSTEM.OUT.PRINTLN ("IP address:" +ip+"\ nthe content data:" +data+"\ n port number port:" +port);
54. //5. Closing Resources
56. Ds.close ();
58. }
60. }

The running results show:

References: Java video Bi Xiangdong presenter

Original address: http://blog.csdn.net/qingdujun/article/details/39300293

Java UDP uses sockets for network communication (0)