java udp

connected to the word is unable to communicate, at this time the equivalent of access to the channel, communication is equivalent to the transmission of data;Why do you say this, which is the basic knowledge of network programming, and what in Java provides to enable us to communicate through these protocols?That's the socket, and what we usually call Java's network programming is actually the socket programming:Sockets are a mechanism for network se

;importjava.io.ioexception;importjava.net.datagrampacket;import Java.net.inetaddress;importjava.net.multicastsocket;importjava.net.unknownhostexception;public classmulticlient{publicstaticvoidmain (String[] args) {try{ // Create socket multicastsocketsocket=newmulticastsocket (); inetaddressgroup=inetaddress.getbyname ("231.0.0.0"); //creating a Send packet byte[]buf=newbyte[0]; Datagrampacketsendpacket=newdatagrampacket (buf,0,group,12345); //Sending Data for (inti=0;iThis article is from th

IntroductionThe purpose of this project is to implement the function of transferring a file between different hosts through network connections between two applications. The two applications should use UDP and TCP Protocols respectively to transmit at least 1 MB of files.Implementation and descriptionSource code Both applications are implemented by a single program with source code. Description The program uses the following command line for compilati

replied: "Eaten!" "But will not answer whether you can play together."The third situation: she only heard the second sentence, so only answer: "Can play together!" "But I won't answer if you have eaten."Fourth situation: She didn't hear two words, so she won't answer any of your words.This is the non-connected UDP protocol for the transport layer.TCP protocol: Characteristics:1. Establish a connection to form a channel for transmitting data.

; Public classUdpClientImplementsRunnable {Private intPort; PublicUdpClient (intPort) { This. Port =Port; } Public voidrun () {Try{Datagramsocket Client=NewDatagramsocket (); byte[] bs =New byte[4]; Inetsocketaddress Isa=NewInetsocketaddress ("localhost", Port); Datagrampacket Data=NewDatagrampacket (BS, bs.length); Data.setsocketaddress (ISA); for(inti = 0; I ) {Data.setdata (Int2bytes (i)); Client.send (data); } } Catch(Exception

Datagramsocket ();SendSocket.send (P);Empty the contents of the Send boxTxtsend.settext ("");} catch (Unknownhostexception E1) {E1.printstacktrace ();} catch (SocketException E2) {E2.printstacktrace ();} catch (IOException E3) {E3.printstacktrace ();}}else if (E.getsource () ==btnclose) {System.exit (0);}}}650) this.width=650; "Src=" https://s5.51cto.com/wyfs02/M01/9B/D5/wKiom1lnhlLQwT9pAAEc0WHTlZs544.jpg-wh_500x0-wm_ 3-wmp_4-s_4008580126.jpg "title=" udp.jpg "width=", "height=" 391 "border=" 0

Socket is used when learning Java, but I still don't understand what is going on. There is no foundation for computer networks. I found some information everywhere. A rough summary of the useful information is provided to facilitate a deeper understanding in the future. For more information, see. I. Differences between the Tup protocol and the UDP protocol TCP-the transmission control protocol provides conn

Importjava.net.InetAddress;4 5 Public classUdpClient {6 Public Static voidMain (string[] args) {7Datagramsocket DGs =NULL;8 Try {9dgs=NewDatagramsocket ();Ten //Send->server OneString str= "So Dirty haha~"; ADatagrampacket dgp_send=NewDatagrampacket (Str.getbytes (), 0,str.length (), Inetaddress.getbyname ("localhost"), 8888); - dgs.send (dgp_send); - //receive from server the byte[] buf=New byte[256]; -Datagrampacket dgp2_receive=NewDatagrampac

Content: A simple example of UDP communication.Receiver:public class Receiver {public static void main (string[] args) {Datagramsocket ds = null;try {//udp Receive-side ds = new Datagramsock ET (8080);//defines where UDP packets are received byte[] buf = new byte[1024];//defines the data receive packet for UDP datagram

It is relatively easy to do network programming in Java, because the java.net package in J2SE is well encapsulated in various communication protocols, this article mainly describes how to write applications based on UDP (User datagram) protocol. Usually we do network programming is generally using socket based TCP/IP programming, after all, TCP/IP applications are very extensive, such as we browse the Inte

,buf.length); Ds.receive (DP); String IP=dp.getaddress (). gethostaddress (); String Data=NewString (Dp.getdata (),0, Dp.getlength ()); if("886". Equals (data)) {System. out. println (ip+".... Leave the chat room"); Break; } System. out. println (ip+":"+data); } } Catch(Exception e) {Throw NewRuntimeException ("Receive side failed"); } }}classchatdemo{ Public Static voidMain (string[] args) throws Exception {Datagramsocket Sendsocket=NewDatagramsocket (); Datagra

本文介绍如何用Java实现Socket编程。首先介绍Java针对Socket编程提供的类，以及它们之间的关系。然后分别针对TCP和UDP两种传输层协议实现Socket编程。 Introduction to socket programming interface in 1 Java Java encapsulates several important classes for socket programming. 1.1 Socket Class Socket class implements a client socket, as t

Network protocol seven-tier structure:What is a socket?The socket (socket) is the end of the two-program data exchange between the two-way channel, which can be understood as an interface. Using socket programming is also known as network programming, and sockets are just interfaces that are not network communication protocols.The difference between the HTTP protocol and the socketThe HTTP protocol is the application layer, its pattern is request-reply, the client sends the request, the server s

The Datagramchannel in Java NiO is a channel that can send and receive UDP packets. Because UDP is a non-connected network protocol, it cannot be read and written like other channels. It sends and receives a packet.Server-side codePackage Com.test.nio;import Java.io.ioexception;import Java.net.inetsocketaddress;import java.nio.ByteBuffer; Import Java.nio.channels

Recently more busy, has been taking time to review some Java technology applications.Nothing to do today, based on the UDP protocol, wrote a very simple chat room program.The current job, rarely used sockets, is also a simple memory of the Java network programming.First look at the effect:The effect of the implementation can be said to be very, very simple, but i

"); TRECV =NewTextArea ("", -, -, textarea.scrollbars_vertical_only); Tsend =NewTextArea ("", -, -, textarea.scrollbars_vertical_only); R.setbounds ( -, -, -, -); R.setlayout (NewFlowLayout ()); R.add (TRECV); R.add (Tsend);//frame Events Event(); R.setvisible (true);//Set the input box to the current focusTrecv.transferfocus (); } Public Static void Event() {R.addwindowlistener (NewWindowadapter () { Public void windowclosing(WindowEvent e) {System.exit (0); } }); Ts

The difference between the UDP protocol and the TCP protocol is no longer analyzed, mainly to analyze how these two protocols are used in Java communication programming.First introduces TCP, which provides good support for the Tcp,java language. To establish TCP communication, you need to build the server first andTo the server's IP and port number.Socket class u

); Output System.out.println (new String (buffer, 0, packet.getlength ())); Returns the message String str = "welcome! "; Datagrampacket Packet2 = new Datagrampacket (Str.getbytes (), str.length (), packet.getaddress (), Packet.getport () );//fill in the sender's information here socket.send (Packet2); Socket.close (); }}The runtime first runs UdpUnit2 because it is waiting to be received at the beginning, and then runs UdpUnit1,

(NewInputStreamReader (system.in)); String Line=NULL; Try { while((Line=br.readline ())! =NULL) { byte[] buf=line.getbytes (); Datagrampacket DP=NewDatagrampacket (Buf,buf.length,inetaddress.getbyname ("192.168.0.255"), 10001); Ds.send (DP); if(Line.equals ("Over")) Break; } } Catch(Exception e) {} ds.close (); }}//Receive ClassclassRecieveImplementsrunnable{datagramsocket ds; Publicrecieve (Datagramsocket

Program | network 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 s