Multi-client sign-on (TCP-based streaming socket socket programming)

1. Serialization of objects

Package Com.ljb.app.socket;import java.io.serializable;/** * User class (for serialization) * @author LJB * @version March 12, 2015 */public class  User implements serializable{private string name; private string password; public string GetName () {return name;} public void SetName (String name) {this.name = name;} public string Getpasswor D () {return password;} public void SetPassword (String password) {this.password = password;}}

2, the Client

 package com.ljb.app.socket;import java.io.BufferedReader;import java.io.IOException; import java.io.inputstream;import java.io.inputstreamreader;import java.io.objectoutputstream; import java.io.outputstream;import java.io.printwriter;import java.net.socket;import  java.net.unknownhostexception;/** *  Client (simulates customer login and receives service-side response)  *  @author  ljb * @ version 2015 March 11  */public class LoginClient { /**  *  @param  args  */ public static void main (String[] args)  {  try  {   //  Establish a client Socket connection, specify the location of the server, and Port    Socket socket =  New socket ("localhost", 8800);      //  get Socket read/write stream     Outputstream os = socket.getoutputstream ();      //  Serializing an Object    objectoutPutstream oos = new objectoutputstream (OS);      //  Get input stream    inputstream is = socket.getinputstream ();    Bufferedreader br = new bufferedreader (New inputstreamreader (IS));       //  write Operations    user user = new user ();    User.setname ("Tom2");    user.setpassword ("1234567");    oos.writeobject (user);    socket.shutdownoutput ();      //  Receive server response     String reply = null;   while  (!) ( (Reply = br.readline ())  == null))  {    system.out.println ("I am the client, The server response is: " + reply);   }      //  Close stream     br.close ();    is.close ();    oos.close ();   os.close ();    socket.close ();  } catch  ( unknownhostexception e)  {   e.printstacktrace ();  } catch  ( ioexception e)  {   e.printstacktrace ();   } }}

3, server-side

 package com.ljb.app.socket;import java.io.BufferedReader;import java.io.IOException; import java.io.inputstream;import java.io.inputstreamreader;import java.io.objectinputstream; Import java.io.outputstream;import java.io.printwriter;import java.net.serversocket;import  java.net.Socket;/** *  Server (receiving client login information and responding)  *  @author  LJB *  @version  2015 March 11  */public class LoginServer { /**  *  @param  args   */ public static void main (String[] args)  {   try  {   //  set up a server binding specified port socket (serversocket) and start listening    ServerSocket  Serversocket = new serversocket (8800);      //  use Accept () Method blocking waits for monitoring, obtaining a new connection    socket socket = null;      //   Number of customers    int num = 0;      //  Continuous monitoring    while  (true)  {     socket = serversocket.accept ();         serverthread serverthread = new serverthread (socket);     Serverthread.start ();        num++;     System.out.println ("Number of Customers:"  + num);    //  IP information for customers      Inetaddress is = socket.getinetaddress ();         //   Customer's IP address     string ip = is.gethostaddress ();     System.out.println ("Customer's IP Address:"  + IP);        //  the customer's host name     string hostname = is.gethostname ();     System.out.println ("Customer name is:"  + hostname);   }  } catch  (ioexception e)  {   e.printstacktrace ();   }  }}

4, service thread

package com.ljb.app.socket;import java.io.ioexception;import java.io.inputstream;import  java.io.objectinputstream;import java.io.outputstream;import java.io.printwriter;import  java.net.serversocket;import java.net.socket;/** *  Create a service thread to continuously respond to customer requests  *  @author   ljb *  @version  2015 March 12  */public class serverthread extends thread  { Socket socket = null;  public ServerThread  (Socket socket )  {  this.socket = socket; }  //  respond to customer requests  public void  run  ()  {  try {   //  get input stream    inputstream  is = socket.getinputstream ();      //  to get the stream, you can deserialize the object     objectinputstream ois = new objectinputstream (IS);       //  Get output stream  &nbsP; outputstream os = socket.getoutputstream ();    printwriter pw =  new printwriter (OS);      //  read user input information    user  user =  (user) ois.readobject ();    system.out.println ("Users info:"  +  User.getname ()  +  " "  + user.getpassword ());       //   Response Information    String reply =  "Welcome";    pw.write (Reply);    pw.flush ();      //  close stream    pw.close ();    os.close ();    ois.close ();    is.close ();    Socket.close ();  } catch  (ioexception e)  {   e.printstacktrace ();   } catch  (classnotfoundexception e)  {   e.printstacktrace ();   }  }}

The client passes two different objects

Operation Result:

Client:

I am the client, the server response is: Welcome

Service side:

Number of customers: 1
User information: Tom 123456
Number of customers: 2
User information: Tom2 1234567

Multi-client sign-on (TCP-based streaming socket socket programming)