UDP transport protocol in Java

 Package Pack;Import Java.io.BufferedReader;Import Java.io.IOException;Import Java.io.InputStreamReader;Import Java.Net.Datagrampacket;Import Java.Net.Datagramsocket;Import Java.Net.inetaddress;/* Public class Demo{     Public Static voidMain (string[] args) throws Exception {//TODO auto-generated method stub        //method1 ();} Public Static voidMethod1 () throws Exception {inetaddress i = inetaddress.getlocalhost ();        System.out.println (i.ToString ()); InetAddress ia = Inetaddress.getbyname ("Www.baidu.com");    System.out.println (Ia.gethostaddress ()); }} send receive data class udpsend {     Public Static voidMain (string[] args) throws Exception {//1. Creating a UDP service through Datagramsocket objectsDatagramsocket ds =NewDatagramsocket ();//2. Determining data, encapsulating into packagesbyte[] buf ="UDP send". GetBytes (); Datagrampacket DP =NewDatagrampacket (Buf,buf.length,inetaddress.getbyname ("192.168.1.2"),10000);//3. Send the existing data packets through the socket serviceDs.send (DP);    Ds.close (); }} class udpreceive {     Public Static voidMain (string[] args) throws Exception {//1. Creating a UDP socket, establishing an endpoint, specifying a portDatagramsocket ds =NewDatagramsocket (10000); while(true) {//2. Defining a packet for storing databyte[] buf =Newbyte[1024x768]; Datagrampacket DP =NewDatagrampacket (buf,buf.length);//3. Receiving data from a service's receiveDs.receive (DP);//4. Obtaining IP addresses and data from packet objectsString IP = dp.getaddress (). gethostaddress (); String data =NewString (Dp.getdata (),0, Dp.getlength ());            int port = Dp.getport (); System.out.println (ip+":"+data+":"+port);        Ds.close (); }}} keyboard input to send data class UdpSend2 {     Public Static voidMain (string[] args) throws Exception {Datagramsocket ds =NewDatagramsocket (); BufferedReader BUFR =NewBufferedReader (NewInputStreamReader (System.inch)); String line = Bufr.readline (); while(line!=NULL) {if("Over". Equals (line)) { Break;            } byte[] buf = Line.getbytes (); Datagrampacket DP =NewDatagrampacket (Buf,buf.length,inetaddress.getbyname ("192.168.1.10"),10001);        Ds.send (DP); }    }} class UdpRece2 {     Public Static voidMain (string[] args) throws Exception {Datagramsocket ds =NewDatagramsocket (100001); while(true) {byte[] buf =Newbyte[1024x768]; Datagrampacket DP =NewDatagrampacket (buf,buf.length);            Ds.receive (DP);            String IP = dp.getaddress (). gethostaddress (); String data =NewString (Dp.getdata (),0, Dp.getlength ()); System.out.println (ip+":"+data); }    }}*// * Chat program * / Public  class Demo {     Public Static voidMain (string[] args) throws Exception {//TODO auto-generated method stubDatagramsocket Sendsocket =NewDatagramsocket (); Datagramsocket Recesocket =NewDatagramsocket (10001);NewThread (NewSend (Sendsocket)). Start ();NewThread (NewRece (Recesocket)). Start (); }} class Send implements Runnable {    PrivateDatagramsocket ds; Send (Datagramsocket ds) { This. ds = ds; } Public voidRun () {Try{BufferedReader BUFR =NewBufferedReader (NewInputStreamReader (System.inch)); String line = Bufr.readline (); while(line!=NULL) {if("Over". Equals (line)) Break;            byte[] buf = Line.getbytes (); Datagrampacket DP =NewDatagrampacket (Buf,buf.length,inetaddress.getbyname ("192.168.1.10"),10001);            Ds.send (DP); }        }Catch(Exception e) {System.out.println ("Error"); }    }} class rece implements Runnable {    PrivateDatagramsocket ds; Rece (Datagramsocket ds) { This. ds = ds; } Public voidRun () {Try{ while(true) {byte[] buf =Newbyte[1024x768]; Datagrampacket DP =NewDatagrampacket (buf,buf.length);            Ds.receive (DP);            String IP = dp.getaddress (). gethostaddress (); String data =NewString (Dp.getdata (),0, Dp.getlength ()); System.out.println (ip+":"+data); }        }Catch(Exception e) {System.out.println ("Error"); }    }}

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UDP transport protocol in Java