Java Basic Knowledge Enhancement Network programming note 04:UDP data from the sending end of the keyboard input case

1. Data from the keyboard input

Keyboard 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 the Send method of the socket object, send the packet the * 4. Releasing Resources -  * -  */ -  Public classUdpsenddemo { +      Public Static voidMain (string[] args)throwsIOException { -         //Create a send-side socket object, where UDP uses the client's socket object class Datagramsocket. +         //Datagramsocket:datagramsocket () ADatagramsocket ds =NewDatagramsocket (); at          -         //Create the data and package the data -         //Datagrampacket: This class represents a datagram packet -         /**Datagrampacket (byte[] buf, int length, inetaddress address, int port) - * * Constructs a datagram package that is used to send packets of length to the specified port number on the specified host.  -         */ in          -          while(true) { toScanner sc =NewScanner (system.in); +String data =sc.nextline (); -         if(Data.equals ("886")){ the              Break; *         } $             Panax Notoginseng         byte[] bytes =data.getbytes (); -         //IP Address Object theInetAddress address = Inetaddress.getbyname ("49.123.72.145"); +         //Port number A         intPort = 10086; the         //Data Packaging +Datagrampacket DP =Newdatagrampacket (Bytes, bytes.length, address, port); -          $              $         //call the Send method of the socket object, send the packet -         //Public void Send (Datagrampacket p) - Ds.send (DP); the          -         }Wuyi         //Freeing Resources the ds.close (); -          Wu     } -  About}

(2) Receiving end:

1  PackageCom.himi.updDemo1;2 3 Importjava.io.IOException;4 ImportJava.net.DatagramPacket;5 ImportJava.net.DatagramSocket;6 Importjava.net.InetAddress;7 8 /**9  * Ten * UDP protocol receives data: One * 1. Create a socket object on the receiving end A * 2. Create a packet, receive data (Receive container) - * 3. Call the Receive method of the socket object, receive the packet - * 4. Parse the packet and display it in the console the * 5. Releasing Resources -  * -  */ -  +  Public classUdpreceivedemo { -  +      Public Static voidMain (string[] args)throwsIOException { A         //create a socket object on the receiving end at         //datagramsocket (int port): Creates a datagram socket and binds it to the specified port on the local host -Datagramsocket ds =NewDatagramsocket (10086); -          -          -          while(true) { -             //Create a packet, receive data (Receive container) in             //Datagrampacket (byte[] buf, int length) -             byte[] bytes =New byte[1024]; to             intLength =bytes.length; +  -Datagrampacket DP =Newdatagrampacket (bytes, length); the  *             //calls the Receive method of the socket object, receives the packet $             //Public void receive (Datagrampacket p)Panax NotoginsengDs.receive (DP);//Blocking Method -  the             //parse the packet and display it in the console +             //get the IP of each other A             //Public inetaddress getaddress () theInetAddress address =dp.getaddress (); +String IP =address.gethostaddress (); -  $             //Public byte[] GetData (): Buffer to get data $             //public int GetLength (): Gets the actual length of the data -             byte[] Bys =Dp.getdata (); -             intLen =dp.getlength (); theString s =NewString (bys, 0, Len); - WuyiSystem.out.println ("Send side" + IP + "Data:" +s); the         } -          Wu         //Freeing Resources -         //ds.close (); About          $                  -  -     } -  A}

The results are as follows:

Java Basic Knowledge Enhancement Network programming note 04:UDP data from the sending end of the keyboard input case