Datagramsocket client-to-server Java instance

1 Importjava.io.IOException;2 ImportJava.net.DatagramPacket;3 ImportJava.net.DatagramSocket;4 Importjava.net.InetAddress;5 6  Public classtimeclient_udp{7       Public Static voidMain (String args[])throwsioexception{8String host = "localhost";9          byte[] msg =New byte[256];//storing and receiving dataTenInetAddress addr = inetaddress.getbyname (host);//Get host Address OneSystem.out.println ("Listening host is:" +addr); ADatagrampacket packet =NewDatagrampacket (msg,msg.length,addr,3000);//create a datagram to send and receive -Datagramsocket socket =NewDatagramsocket ();//Create a Socket object for communication -Socket.send (packet);//Send Datagrams thePacket =NewDatagrampacket (msg,msg.length);//Create a received datagram -Socket.receive (packet);//receive datagrams and store them in packet -String time =NewString (Packet.getdata ());//get the data content in a datagram -System.out.println (the current date for "Listen Host:" +host+ "is:" +Time ); +Socket.close ();//Release Socket -     } +}

Datagramsocket Client

1 Importjava.io.IOException;2 ImportJava.net.DatagramPacket;3 ImportJava.net.DatagramSocket;4 Importjava.net.InetAddress;5 Importjava.util.Date;6  Public classtimeserver_udp{7       Public Static voidMain (String args[])throwsioexception{8Datagramsocket socket =NewDatagramsocket (3000);//socket object. Port9System.out.println ("Waiting to receive data ...");Ten            while(true){ One                byteBuf[] =New byte[256]; ADatagrampacket packet =NewDatagrampacket (buf,buf.length); - socket.receive (packet); -                 theInetAddress addr =packet.getaddress (); -                intPort =Packet.getport (); -System.out.println ("received from" + addr.tostring () + ":" +port+ "Data"); -                 +String date =NewDate (). toString (); -BUF =date.getbytes (); +Packet =NewDatagrampacket (buf,buf.length,addr,port); A socket.send (packet); at           } -      } -}

Datagramsocket Service Side

Datagramsocket Client Java Project Project catalog is E:\EclipseProject\TimeClient_UDP.

Datagramsocket Server Java Project Project catalog is E:\EclipseProject\TimeServer_UDP.

Steps to run in DOS command-line cmd for Windows systems:

1. Configure the system environment variables

Java_home (add directory to store JDK) C:\Program files\java\jdk1.8.0_65

Path (Add bin subdirectory under JDK directory)%java_home%\bin

Classpath (Add the required packages in the Lib subdirectory of the JDK directory).; %java_home%\jre\lib;%java_home%\lib\dt.jar;%java_home%\lib\tools.jar;

2, open two DOS windows, respectively into the Datagramsocket client and service side of the project directory (the above directory)

3, the source code through the JAVAC project name, compile the. class file, then the Java project name, run

4, step 2,3 See figure 1DatagramSocket client running effect; Figure 2DatagramSocket Service side running effect.

Datagramsocket client-to-server Java instance