An example of a Java Socket server and client communication

http://blog.csdn.net/defonds/article/details/7971259

A small example of a service-side communication that multiple clients correspond to.

Service side and client code:

 Public classServer {/*** Listening Ports*/     Public Static Final intPORT = 12345;  Public Static voidMain (string[] args) {System.out.println ("Server Start" ""); Server server=NewServer ();    Server.init (); }     Public voidinit () {Try{serversocket ServerSocket=NewServerSocket (PORT);  while(true){                //Once there is a blockage, the server and the client get a connectionSocket client =serversocket.accept (); Newhandlerthread (client); }        } Catch(Exception e) {e.printstacktrace (); }    }    Private classHandlerthreadImplementsrunnable{Privatesocket socket;  PublicHandlerthread (socket socket) { This. Socket =socket; NewThread ( This). Start (); } @Override Public voidrun () {Try {                //Read client dataDataInputStream input =NewDataInputStream (Socket.getinputstream ()); //here to pay attention and the client output stream write method corresponds, otherwise it will throw EofexceptionString Clientinputstr =Input.readutf (); //processing data sent by the clientSystem.out.println ("What the client sent over:" +clientinputstr); //want the client to send a messageDataOutputStream out =NewDataOutputStream (Socket.getoutputstream ()); System.out.println ("Please enter: \ t"); String outstr=NewBufferedReader (NewInputStreamReader (system.in)). ReadLine ();                Out.writeutf (OUTSTR);                Out.close ();            Input.close (); } Catch(IOException e) {System.out.println ("Server Exception:" +e.getmessage ()); }finally {                if(Socket! =NULL) {                    Try{socket.close (); } Catch(Exception e) {socket=NULL; System.out.println ("Server End Finally exception:" +e.getmessage ()); }                }            }        }    }}

 Public classClient { Public Static Final intPORT = 12345;  Public Static FinalString ip_addr = "localhost";  Public Static voidMain (string[] args) {System.out.println ("Client Enablement" ""); System.out.println ("When the server-side character is received as \" Ok\ ", the client terminates \ n");  while(true) {Socket Socket=NULL; Try {                //create a stream socket and connect it to the specified port number on the specified hostSocket =NewSocket (Ip_addr,port); Socket.setsotimeout (5000); //Read server-side dataDataInputStream input =NewDataInputStream (Socket.getinputstream ()); //send data to server sideDataOutputStream out =NewDataOutputStream (Socket.getoutputstream ()); System.out.print ("Please enter: \ t"); String Str=NewBufferedReader (NewInputStreamReader (system.in)). ReadLine ();                Out.writeutf (str); String ret=Input.readutf (); System.out.println ("The server side returned is:" +ret); if(Ret.endswith ("OK") {System.out.println ("The client will close the connection"); Thread.Sleep (500);  Break;                } out.close ();            Input.close (); } Catch(IOException |interruptedexception e)            {E.printstacktrace (); }finally {                if(Socket! =NULL) {                    Try{socket.close (); } Catch(IOException e) {socket=NULL; System.out.println ("Client finally exception:" +e.getmessage ()); }                }            }        }    }}

An example of a Java Socket server and client communication