loginclient.java

高级java2 大学教程(含源码,经典的Java学习教程

// LoginClient.java
// LoginClient uses an SSLSocket to transmit fake login
// information to LoginServer.
package com.deitel.advjhtp1.security.jsse;

// Java core packages
import java.io.*;

// Java extension packages
import javax.swing.*;
import javax.net.ssl.*;

public class LoginClient {
   
   // LoginClient constructor
   public LoginClient()
   {     
      // open SSLSocket connection to server and send login
      try { 
         
         // obtain SSLSocketFactory for creating SSLSockets
         SSLSocketFactory socketFactory = 
            ( SSLSocketFactory ) SSLSocketFactory.getDefault();
         
         // create SSLSocket from factory
         SSLSocket socket = 
            ( SSLSocket ) socketFactory.createSocket( 
               "localhost", 7070 ); 
         
         // create PrintWriter for sending login to server
         PrintWriter output = new PrintWriter( 
            new OutputStreamWriter( socket.getOutputStream() ) );
         
         // prompt user for user name
         String userName = JOptionPane.showInputDialog( null,
            "Enter User Name:" );
         
         // send user name to server
         output.println( userName );
         
         // prompt user for password
         String password = JOptionPane.showInputDialog( null,
            "Enter Password:" );
         
         // send password to server
         output.println( password );
         
         output.flush();
         
         // create BufferedReader for reading server response
         BufferedReader input = new BufferedReader( 
            new InputStreamReader( socket.getInputStream () ) );
         
         // read response from server
         String response = input.readLine();
         
         // display response to user
         JOptionPane.showMessageDialog( null, response );
         
         // clean up streams and SSLSocket
         output.close();
         input.close();
         socket.close();
         
      } // end try
      
      // handle exception communicating with server
      catch ( IOException ioException ) { 
         ioException.printStackTrace(); 
      } 
      
      // exit application
      finally {
         System.exit( 0 );
      }

   } // end LoginClient constructor
   
   // execute application
   public static void main( String args[] )
   {
      new LoginClient();
   }
}

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