Java socket Programming-UDP-based

Package Com.wzy.udptest;import Java.net.datagrampacket;import java.net.datagramsocket;import java.net.InetAddress;/** * * * @author Wzy * Server-side, implementation of UDP-based user login*/ Public classUdpserver { Public Static voidMain (string[] args) {Try{        //1. Create a server-side datagramsocket, specify the portDatagramsocket socket =NewDatagramsocket (8800); //2. Create a datagram to receive data sent by the client//creates a byte array that specifies the size of the received packet        byte[] data =New byte[1024x768]; Datagrampacket Packet=Newdatagrampacket (data, data.length); System. out. println ("server startup ..... "); //3. Receiving data sent by the client//This method will block until the datagram is receivedsocket.receive (packet); //4. Reading dataString info =NewString (data,0, data.length); System. out. println ("server-side received the message:"+Info.trim ()); /** * Response data to client **/        //1. Define the client's address, port number, dataInetAddress address =packet.getaddress (); intPort =Packet.getport (); byte[] Data2 ="Hello, client". GetBytes (); //2. Create a datagram that contains the data information for the responseDatagrampacket Packet2 =NewDatagrampacket (data2, Data2.length,address,port); //3. Responding to clientssocket.send (Packet2); //4. Close ResourcesSocket.close (); }        Catch(Exception E) {e.printstacktrace (); }                                    }}

Package Com.wzy.udptest;import Java.io.ioexception;import java.net.datagrampacket;import Java.net.datagramsocket;import Java.net.inetaddress;import Java.net.socketexception;import java.net.UnknownHostException;/** * Client*/ Public classUdpClient { Public Static voidMain (string[] args) throws IOException {/** * Send data to the server **/        //1. Define the server's address, port number, dataInetAddress address = Inetaddress.getbyname ("localhost"); intPort =8800; byte[] data ="user name: admin; Password: 123". GetBytes (); //2. Create a datagram that contains the sent data informationDatagrampacket packet =Newdatagrampacket (data, data.length, address, Port); //3. Create a Datagramsocket objectDatagramsocket socket =NewDatagramsocket (); //4. Sending datagrams to the serversocket.send (packet); /** * Receive server-side response **/        //1. Create datagrams to receive data from server-side responses        byte[] Data2 =New byte[1024x768]; Datagrampacket Packet2=NewDatagrampacket (data2, data2.length); //2. Accept data from server responsesocket.receive (Packet2); //3. Reading dataString reply =NewString (Data2,0, Packet2.getlength ()); System. out. println ("The client receives a response:"+reply); //4. Close ResourcesSocket.close (); }}

Java socket Programming-UDP-based