clientreadfile.java

一个简单的商品采集系统

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ClientReadFile extends JFrame {
   private ObjectInputStream input;
   private ServerOperatePanel userInterface;
   private JButton nextRecord, open;
   
   public final String attributeNames[] = { "Attribute-Name", "Type","Length",
                                           "ConstrainTag","Constrain"};
   // Constructor -- initialize the Frame 
   public ClientReadFile()
   {
      super( "Display the defined attributes" );

      getContentPane().setLayout( new BorderLayout() );
      userInterface = new ServerOperatePanel( 5, attributeNames );
      nextRecord = userInterface.getDoTask1();
      nextRecord.setText( "Show Attribute" );
      nextRecord.setEnabled( false );  
 
      nextRecord.addActionListener(
         new ActionListener() {
            public void actionPerformed( ActionEvent e )
            {               
               readRecord();
               nextRecord.setText( "Next Attribute" );
            }
         }
      );
 
      addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e )
            {
               if( input != null)
                 closeFile();
            }
         }
      ); 
      open = userInterface.getDoTask2();

      open.setText( "Open Format-File" );
      open.addActionListener(
         new ActionListener() {
            public void actionPerformed( ActionEvent e )
            {
                 openFile();
            }
         }
      );
      
      getContentPane().add( userInterface, 
                            BorderLayout.CENTER );
      pack();
      setSize( 500, 250 );
      show();
   }

   private void openFile()
   {
      JFileChooser fileChooser = new JFileChooser();

      fileChooser.setFileSelectionMode(
         JFileChooser.FILES_ONLY );
      int result = fileChooser.showOpenDialog( this );
 
      // user clicked Cancel button on dialog
      if ( result == JFileChooser.CANCEL_OPTION )
         return;

      File fileName = fileChooser.getSelectedFile();
 
      if ( fileName == null ||
           fileName.getName().equals( "" ) )
         JOptionPane.showMessageDialog( this,
            "Invalid File Name",
            "Invalid File Name",
            JOptionPane.ERROR_MESSAGE );
      else {
         // Open the file
         try {
            input = new ObjectInputStream(
                        new FileInputStream( fileName ) );
            open.setEnabled( false );
            nextRecord.setEnabled( true );
         }
         catch ( IOException e ) {
            JOptionPane.showMessageDialog( this,
               "Error Opening File", "Error",
               JOptionPane.ERROR_MESSAGE );
         }      
      }
   }

   public void readRecord()
   {
      ItemAttribute record;
      // input the values from the file
      try {
         record = ( ItemAttribute ) input.readObject();
         String values[] = {
            record.getName(),
            ""+TypeIndex( record.getType() ),
            ""+record.getLength(),
            ""+ConstrainTagIndex( record.getConstrainTag() ),
            ""+ConstrainIndex( record.getConstrain() )};
            
         userInterface.setFieldValues( values );
      }
      catch ( EOFException eofex ) {
         nextRecord.setEnabled( false );
         JOptionPane.showMessageDialog( this,
            "No more Attributes in file",
            "End of File", JOptionPane.ERROR_MESSAGE );
      }
      catch ( ClassNotFoundException cnfex ) {
         JOptionPane.showMessageDialog( this,
            "Unable to create object",
            "Class Not Found", JOptionPane.ERROR_MESSAGE );
      }
      catch ( IOException ioex ) {
         JOptionPane.showMessageDialog( this,
            "Error during read from file",
            "Read Error", JOptionPane.ERROR_MESSAGE );
      }
   }

   private void closeFile()
   {
      try {
         input.close();
         //System.exit( 0 );
      }
      catch ( IOException e ) {
         JOptionPane.showMessageDialog( this,
            "Error closing file",
            "Error", JOptionPane.ERROR_MESSAGE );
         System.exit( 1 );
      }
   }
   
   //change the ItemAttribute data to the valid String format for displaying
   //ItemAttribute(String,int,int,boolean,int)
   
   private String TypeIndex( int type)
   {
   	  if( type == 1 )
   	    return "Integer";
   	    else if( type == 2 )
   	      return "Float";
   	      else if( type == 3 )
   	         return "String";
   	         else
   	            return null;
   	  
   }
   
   private String ConstrainTagIndex( boolean tag )
   {
   	  if( tag == true )
   	    return "true";
   	    else if( tag == false )
   	      return "false";
   	       else
   	         return "true";
   	    
   } 
   
   private String ConstrainIndex( int c )
   {
   	 if( c == 1 )
   	   return "Key";
   	   else
   	     return "NotKey";
   }
}