remoteindyclient.java~1~

大量java源程序

/*
 * @(#)RemoteIndyClient
 *
 * Copyright (c) 1998 Karl Moss. All Rights Reserved.
 *
 * You may study, use, modify, and distribute this software for any
 * purpose provided that this copyright notice appears in all copies.
 *
 * This software is provided WITHOUT WARRANTY either expressed or
 * implied.
 *
 * @author  Karl Moss
 * @version 1.0
 * @date    17Apr98
 *
 */

package javaservlets.tunnel;

import java.io.*;
import javaservlets.tunnel.client.*;

/**
  * <p>This class implements the client for tunneling
  * calls to the Indy object.
  */

public class RemoteIndyClient
  extends TunnelClient
  implements IndyInterface
{

  /**
    * <p>Constructs a new RemoteMathLiteClient for the
    * given URL. The URL should contain the location of
    * servlet scripts (i.e. http://larryboy/servlet/).
    */
  public RemoteIndyClient(String url)
    throws TunnelException, IOException
    {
      // Append the remote server name
      url += "RemoteIndyServer";

      // Set the URL
      _setURL(new java.net.URL(url));

      // Initialize the client and server
      _initialize();
    }

  /**
    * <p>Connects to the database.
    *
    * @return True if the database connection was established
    */
  public boolean connect()
    {
      boolean rc = false;
      try {
        // Create an internal buffer
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        // Create an object stream to write the request
        ObjectOutputStream out =
          (ObjectOutputStream) _createHeader(baos, 0);

        // Invoke the method and read the response
        ObjectInputStream in =
          (ObjectInputStream) _invokeMethod(baos.toByteArray());

        // Read the return value
        Boolean b = (Boolean) in.readObject();
        rc = b.booleanValue();

        // Wrap up
        out.close();
        in.close();
      }
      catch (Exception ex) {
        ex.printStackTrace();
      }

      return rc;
    }

  /**
    * <p>Closes the database connection
    */
  public void close()
    {
      try {
        // Create an internal buffer
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        // Create an object stream to write the request
        ObjectOutputStream out =
          (ObjectOutputStream) _createHeader(baos, 1);

        // Invoke the method
        _invokeMethod(baos.toByteArray());

        // Wrap up
        out.close();
      }
      catch (Exception ex) {
        ex.printStackTrace();
      }
    }


  /**
    * <p>Given the year return the corresponding Indianapolis
    * 500 record
    *
    * @param year Year of the race
    * @return Indy 500 record or null if not found
    */
  public IndyRecord[] query()
    {
      IndyRecord[] record=new IndyRecord[100];
      try {
        // Create an internal buffer
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        // Create an object stream to write the request
        ObjectOutputStream out =
          (ObjectOutputStream) _createHeader(baos, 2);

        // Write the parameters
       // out.writeObject(new Integer(year));

        // Invoke the method and read the response
        ObjectInputStream in =
          (ObjectInputStream) _invokeMethod(baos.toByteArray());

        // Read the return value
        //There are maybe problems,cant get array data
 ////////////////////////////////////////////////////////////
       record = (IndyRecord[]) in.readObject();

        // Wrap up
        out.close();
        in.close();
      }
      catch (Exception ex) {
        ex.printStackTrace();
      }
      return record;
    }



}