Java socket client and server-side communication

1. Using the blocking readUTF (); Long-Connection

The 3 main aspects of a 2.java socket are as follows

1) accept block until a connection is accepted and a client object instance is returned

2) getInputStream ()

3) Getoutputstream ()

Client code:

 Public classClientsocket { Public Static FinalString ip= "10.100.63.18";  Public Static Final intport=667;  Public Static voidMain (string[] args) {System.out.println ("Client-initiated ...");  while(true) {Socket Socket=NULL; Try{Socket=NewSocket (Ip,port); //socket.setsotimeout (+);DataOutputStream out=NewDataOutputStream (Socket.getoutputstream ()); String Send= "Hello"; Out.writeutf (send);//client sends to server//Thread.Sleep (+);DataInputStream in=NewDataInputStream (Socket.getinputstream ()); System.out.println ("The client Received:" +In.readutf ());//            Out.close ();            In.close (); }Catch(Exception e) {System.out.println ("Client Exception"); }finally{                if(socket!=NULL){                                        Try{socket.close (); }Catch(IOException e) {}}} }    }}

Service-Side code:

 Public classServer { Public Static intport=667;  Public Static voidMain (string[] args) {System.out.println ("Server startup ..."); Server server=NewServer ();        Server.init (); }        Private voidinit () {//TODO auto-generated Method StubServerSocket sock =NULL; Try{sock=NewServerSocket (PORT);  while(true) {Socket Client=sock.accept (); NewHandlerthread (Client); }        }Catch(Exception e) {}finally{            if(sock!=NULL){            Try{sock.close (); } Catch(IOException e) {//TODO auto-generated Catch blockE.printstacktrace (); }            }        }    }    Private classHandlerthreadImplementsrunnable{PrivateSocket SC;  PublicHandlerthread (Socket client) {SC=client;//try {//sc.setsotimeout (+);//} catch (SocketException e) {//                //TODO auto-generated Catch block//e.printstacktrace ();//            }            NewThread ( This). Start (); } @Override Public voidrun () {//TODO auto-generated Method Stub            Try{DataInputStream input=NewDataInputStream (Sc.getinputstream ()); System.out.println ("Processing client data:" +Input.readutf ()); DataOutputStream Output=NewDataOutputStream (Sc.getoutputstream ()); String s= "Hello,i has received your message";                Output.writeutf (s);                Output.close ();                            Input.close (); }Catch(eofexception e) {System.out.println ("Server Eofexception Exception"); }Catch(IOException e) {System.out.println ("Server Eofexception Exception"); }finally{                if(sc!=NULL){                    Try{sc.close (); }Catch(Exception e) {SC=NULL; }                }            }        }} }

Run Result: (Run server first, run client)

Handling client data: Hello processing client data: Hello Client Received: Hello,i has received your message client received: Hello,i has received your message

Java socket client and server-side communication