java udp

UDP programmingIn the TCP index operation must establish a reliable connection, this will certainly waste a lot of system performance, in order to reduce this overhead, in the network also provides another transport protocol---UDP, unreliable connection, the protocol is widely used in various chat tools.I use Datagrampacket in UDP development to wrap a message to

All TCP operations are based on reliable links UDP (Datagram Protocol) messages sent by the other party do not necessarily receive, all the information is sent in the form of a datagram Using the Datagramsocket class and the Datagrampacket class to complete the operation Server-side UDP: Importjava.net.*;ImportJava.io.*;//defining server-side receive information Public classTestudpserver { Public Static voi

Benefits: The project log is written to Logstash and then sent to Elasticsearch, which makes it easy to view the search log, as well as report analysis.Logstash is a data acquisition tool, there are a variety of channels, such as files, TCP,UDP, etc., if it is to collect log files, you need to store files on the server, start a Logstash service, not easy to quickly deploy, and the way to adopt tcp/udp relat

1. Data from the keyboard inputKeyboard input data to control the entry to the end.2. Code implementation:(1) Sending side:1 PackageCom.himi.updDemo1;2 3 Importjava.io.IOException;4 ImportJava.net.DatagramPacket;5 ImportJava.net.DatagramSocket;6 Importjava.net.InetAddress;7 ImportJava.util.Scanner;8 9 /**Ten * One * UDP protocol sends data: A * 1. Create the socket object on the sending side - * 2. Create the data and package the data - * 3. Call t

* * Send text out via UDP * provide data, package packet * Socket send * Close resource/ udpsenddemo { IOException { //create UDP service datagramsocket (); Determine data encapsulated as packet byte"I am the sender". GetBytes (); datagrampacket (data,data. Length, Inetaddress.getbyname ("127.0.0.1"), 10000); Send Ds.send (DP); Clo

= Inetaddress.getbyname ("127.0.0.1"); Datagrampacket Packet=NewDatagrampacket (data, data.length, address, 9999); //4. Sendclient.send (packet); //5. ReleaseClient.close (); } /*** Byte array datasource + data output stream *@paramd *@return * @throwsIOException*/ Public Static byte[] CONVERT (DoubleDthrowsIOException {byte[] data =NULL; //Write DataBytearrayoutputstream BOS =NewBytearrayoutputstream (); DataOutputStream dos=NewDataOutputStream (BOS); Dos.writedo

UDP is a high-speed, connectionless method of data interchange, characterized by even if the receiver is not connected (and not allowed to connect), the recipient can also send the packet, just as in a multiple-user walkie-talkie environment, you do not know if your information is accepted by the person you need, but your information is actually passed and disappeared. Sometimes speed is more important than data integrity, and it is acceptable to lose

); - //3. Reading data -String reply =NewString (data2, 0, Packet2.getlength ()); -System.out.println ("I am the client, I received the server information:" +reply); in //4. Close Resources - socket.close (); to } +}View Code2. Server-side code1 Importjava.io.IOException;2 ImportJava.net.DatagramPacket;3 ImportJava.net.DatagramSocket;4 Importjava.net.InetAddress;5 /**6 * 7 * UDP Server side8 *9 */Ten Public classUdpserver { One

Using the UDP protocol to write a network program, set the receiver Terminal program listening port is 8001, the sender sends the data is "Hello, World".Receiving end:1 Importjava.net.*;2 Public classExample {3 4 Public Static voidMain (string[] args)throwsException5 {6 byte[] buf=New byte[1024];7Datagramsocket ds=NewDatagramsocket (8001);8Datagrampacket dp=NewDatagrampacket (buf,1024);9System.out.println ("Waiting to receive

UDP does not specifically provide a server-side API as TCP does, all with Datagramsocket and packet datagrams. So UDP is connectionless, because all the links are in the datagram, let Datagramsocket to send. Server End: Import Java.net.DatagramPacket; Import Java.net.DatagramSocket; /** * @author wangking e-mail:admin717@gmail.com * @version Date Created: 2009-9-16 03:25:29 * Class Description */public cla

Java programming assignments: the client sends data to the server based on the demo provided by the instructor. The server receives the data broadcast from the client. The overall function is similar to the chat room, and the code is not too difficult, but this problem occurs during local testing: The server saves the IP addresses of each Socket Client to the Set, and forwards the IP addresses to all the current IP addresses each time the data is rece

Send (sender ): Import Java. io. bufferedreader; import Java. io. ioexception; import Java. io. inputstreamreader; import java.net. datagrampacket; import java.net. datagramsocket; import java.net. inetaddress; import java.net. socketexception; public class senddemo1 {Private Static final int Port = 8080; Private Static final string IP = "localhost"; public s

Server: Listening port (5051), receiving dataImport Java.io.*;import java.net.*;import java.util.scanner;class udpserver{public static void Main (string[] args) thro WS ioexception{Datagramsocket server = new Datagramsocket (5051); byte[] Recvbuf = new byte[100]; Datagrampacket recvpacket = new Datagrampacket (recvbuf, recvbuf.length); while (true) {server.receive (recvpacket); String recvstr = new String (Recvpacket.getdata (), 0, Recvpacket.getlength ()); System.out.println ("Received:" + recv

: 127.0.0.1: HelloFunctions can be improved to achieve keyboard input chat:Send side: Packagedemo;Importjava.io.IOException;ImportJava.net.DatagramPacket;ImportJava.net.DatagramSocket;Importjava.net.InetAddress;ImportJava.util.Scanner; Public classUdpsend { Public Static voidMain (string[] args) {Try{Scanner sc=NewScanner (system.in); Datagramsocket DS=NewDatagramsocket (); InetAddress inet= Inetaddress.getbyname ("127.0.0.1"); while(true) {String message=Sc.nextline (); byte[] data =message.ge

Author: gnuhpcSource: http://www.cnblogs.com/gnuhpc/ Client: Import java.net. datagrampacket;Import java.net. datagramsocket;Import java.net. inetaddress;Import java.net. socketexception;Import java.net. unknownhostexception;Import java. Io. ioexception;Public class udpclient {Public static void main (string Arg []) {String outstr;If (Arg. length> = 1)Outstr = Arg [0];ElseOutstr = "count ";Try {Datagramsocket socket = new datagramsocket ();Byte outblo

(savedInstanceState); setContentView(R.layout.activity_main); IPAddress = (EditText) this.findViewById(R.id.address ); startButton = (Button) this.findViewById(R.id.start); stopButton = (Button) this.findViewById(R.id.stop); startButton.setEnabled(true); stopButton.setEnabled(false); address = getLocalIPAddress();if( address != null ){ IPAddress.setText( address );}else { IPAddress.setText("Can not get IP address"); return;

; Yourporttextfield = In_yourporttextfield; Nametextfield = In_nametextfield; dialog = In_dialog; config = in_config; } public void actionperformed (ActionEvent e) {config.set (Iptextfield.gettext (), Yourporttextfield.gettext (), n Ametextfield.gettext ()); System.out.println ("Config:yourport:" +config.getyourport ()); Dialog.setvisible (FALSE); }}//parameter class config{private String ip= "127.0.0.1"; Private String yourport= "666"; Private S

Both TCP and UDP are port-based protocols. TCP has links, and UDP has no links. The TCP protocol also drops packets (network problems, the data may be gone)The application is sent to the operating system's cache, and the operating system is removed from the cache, and once the data is lost, it is completely gone. TCP is reliable because the data in its own cache is emptied after it receives a confirmation m

Explore UDP socket programming and udp socket programming UDP and TCP are in the same layer network model, that is, the transport layer. There are many applications based on the two. Common TCP-based applications include HTTP and Telnet, UDP-based DNS, NFS, and SNMP are available.