java udp

of the array as a token to determine if the file has been read or not (lenReceiving Party:Package Cn.hncu.url.udp;import Java.net.datagrampacket;import Java.net.datagramsocket;import java.net.InetAddress; Import Java.net.socketexception;public class Receivedemo {public static void main (string[] args) {try {//receive1 ();// Receive small Data receive2 ();//Receive large data} catch (Exception e) {e.printstacktrace ();}} private static void Receive2 () throws Exception {//for receiving larger Pa

Udpsend.javaImport java.io.IOException;Import Java.net.DatagramPacket;Import Java.net.DatagramSocket;Import java.net.InetAddress;Import java.net.SocketException;Import java.net.UnknownHostException; PublicClass Udpsend { PublicStaticvoid Main (String args[]) {Datagramsocket ds =NullDatagrampacket DP =null; try{ ds = new datagramsocket (+); // Instantiate a UDP socket and bind 3000 bindings }catch (SocketException e) {} String str = "Hello world";

Datagrampacket (new byte[1024], 1024);Socket.receive (packet);Byte[]arr=packet.getdata ();int Len=packet.getlength ();String ip=packet.getaddress (). gethostaddress ();//Get IP Addressint Port=packet.getport ();//Get Port numberSystem.out.println (ip+ ":" +port+ ":" +new String (Arr,0,len));}}catch (IOException e) {E.printstacktrace ();}}}Class Send extends thread{public void Run () {try {Scanner sc=new Scanner (system.in);Datagramsocket socket=new Datagramsocket ();while (true) {String Str=sc.

Java encapsulates a large number of socket APIs, which provide great convenience for writing network communication programs.In the study of computer network, we have mastered the basic principle of tcp/udp, here is not to repeat. The source code for the receiver and the sender is given for discussion and criticism.The sending end code is as follows:You can send data as soon as you have a slight improvementI

This morning gives you a brief introduction of TCP network communication knowledge, now for everyone to complement the knowledge of complete network programming, about UDP communication knowledge.UDP is an unreliable network protocol, so what is the use value or necessity? In some cases, the UDP protocol may become very useful. Because UDP has the speed advantage

Java network programming, UDP caseSend SideImportjava.io.ioexception;importjava.net.datagrampacket;importjava.net.datagramsocket;import java.net.InetAddress;importjava.net.SocketException;importjava.net.UnknownHostException; Publicclasssendudp{publicstaticvoidmain (String[]args) {try{ Datagramsocketsocket=newdatagramsocket (); stringstr= "Hellowelcometoadm"; Byte[]buf=str.getbytes (); I Netaddressaddress=in

Using the UDP protocol, write a command-line-based chat software, and the client and the server can send data to each other after the command line is started, respectively.First, create Threads Sendthread and Receivethread 1 PackageCom.fhcq.chat;2 3 //Duplex Chat program4 //Can send data, but also can wait to receive data5 //need to use multithreading to implement6 7 Public classQicqdemo {8 9 Public Static voidMain (string[] args) {Ten

port number with a unique identity on the network can be combined to form a uniquely identifiable identifier socket. socket principle mechanism:? There are sockets on both ends of the communication. ? network communication is actually the communication between sockets. ? data is transmitted via IO between two sockets. UDP Transport Datagramsocket and Datagrampacket establish the sending end, the receiving end. set up the data packag

Because to do the application of the UDP protocol interaction, so it is specifically learning the next, in fact, similar to the Java server and socket, the following is written a simple demoService side:Package Com.test1;import java.io.ioexception;import java.net.datagrampacket;import java.net.DatagramSocket; Import Java.net.inetsocketaddress;import java.net.SocketException; Public classUpdserver {Private b

(Dp.getdata (),0,dp.getlength ()); System.out.println (ip+":" +data); } } catch (Exception e) { throw New RuntimeException ("receiver failed"); } } } Public class Cudpchat { public static void Main (string[] args) throws exception{ //Send side can not specify a port, the system randomly assigns a Datagramsocket sendsocket = new Datagramsocket (); Datagramsocket recesocket = new Datagramsocket (5656); //Turn on multithreading New Thread (new Send (Sendso

address int servport = 5500; Server Port//Convert The argument String to bytes using the default encoding byte[] Bytestosend = "Hi, worl D ". GetBytes (); Datagramsocket socket = new Datagramsocket (); Socket.setsotimeout (TIMEOUT); Maximum Receive blocking time (milliseconds)//sending packet Datagrampacket Sendpacket = new Datagrampacket ( Bytestosend, Bytestosend.length, serveraddress, Servport); Datagrampacket Receivepacket =//Receiving packet new Datagrampacket (new Byte[

[] args) throws IOException { //based on host name To obtain the corresponding inetaddress instance inetaddress ia = inetaddress.getbyname ("192.168.49.50"); //determine if it's up to system.out.println ("oneedu is reachable" +ia.isreachable); // Gets the IP string for the inetaddress instance system.out.println (ia.gethostaddress ()); //Gets the host name of the IP string for the inetaddress instance system.out.println ( Ia.gethostname ()); //Gets the fully qualified domain name

Java UDP network programming simple example Server code /*** UDPClient * @ author Winty wintys@gmail.com * @ version */import java. io. *; import java.net. *; class UDPClient {public static void main (String [] args) throws IOException {DatagramSocket client = new DatagramSocket (); String sendStr = "Hello! I'm Client "; byte [] sendBuf; sendBuf = sendStr. getB

Packetrecevice=NewDatagrampacket (New byte[1024x768],1024x768); Socket.receive (Packetrecevice); String IP= Packetrecevice.getaddress (). gethostaddress ();//get the sender's IP intPort = Packetrecevice.getport ();//get the port of the senderString data =NewString (Packetrecevice.getdata (),0, Packetrecevice.getlength ());//get the data sent overSystem. out. println ("the data received are:"+ Data +"where the sender's IP is:"+ IP +"ports are:"+ port);//print the Received data//and

Bytebuffer = bytebuffer.allocate (19);while (true){Try{Make a selectionint n = selector.select ();if (n > 0){Gets the collection of keys to selectIterator Iterator = Selector.selectedkeys (). Iterator (); while (Iterator.hasnext ()){Selectionkey key = (Selectionkey) iterator.next (); Must be manually removedIterator.remove (); if (key.isreadable ()){Datagramchannel Datagramchannel = (datagramchannel) key. Channel (); Bytebuffer.clear ();ReadInetsocketaddress address = (inetsocketaddress) datagr

Application scenario: A school, whenever the time is over to provide tips for the class function. Analysis: The use of UDP to achieve broadcast to the same network segment of the computer to send data, the client received the data, Pop-up prompts dialog box. The service side needs a loop to determine whether the time is over, if you use the dead loop here, very much of the system resources, I tested the cup in 100%, with