addressbookgui.java

CMU_ ssd3_第三单元答案 绝对正确

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

/**
 * Displays the information in an address book.
 *
 * @author LT
 * @version 1.0.0
 */
public class AddressBookGUI extends JPanel {

	/* Delimiter */
	private final String  DELIM = "_";

	/* Window width in pixels */
	static private int  WIDTH = 450;

	/* Window height in pixels */
	static private int  HEIGHT = 300;

	private JButton  openButton;
	private JButton  displayButton;
	private JLabel  numberOfEntriesLabel;
	private JTextField  fileNameTextField;
	private JTextField  nameTextField;
	private JTextField  addressTextField;
	private JTextField  telephoneTextField;
	private JList  namesList;
	private JTextArea  statusTextArea;

	private AddressBook addressBook;

	/**
	 * Creates a window.
	 *
	 * @param args  not used.
	 */
	public static void main(String[] args) {

		JFrame frame = new JFrame("Address Book");

		frame.setContentPane(new AddressBookGUI());
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(WIDTH, HEIGHT);
		frame.setVisible(true);
	}

	/**
	 * Creates a graphical user interface.
	 */
	public AddressBookGUI() {

		setBackground(Color.white);

		// Create the components
		openButton = new JButton("Open File");
		displayButton = new JButton("Display");
		numberOfEntriesLabel = new JLabel("0 entries");
		fileNameTextField = new JTextField("", 17);
		nameTextField = new JTextField("", 17);
		addressTextField = new JTextField("", 17);
		telephoneTextField = new JTextField("", 17);
		namesList = new JList();
		statusTextArea = new JTextArea(4, 40);

		// Customize the components
		namesList.setVisibleRowCount(8);
		namesList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		namesList.setFixedCellHeight(16);
		namesList.setFixedCellWidth(130);
		numberOfEntriesLabel.setHorizontalAlignment(JLabel.CENTER);
		nameTextField.setEditable(false);
		addressTextField.setEditable(false);
		telephoneTextField.setEditable(false);
		statusTextArea.setEditable(false);

		// Register the listeners for the buttons
		openButton.addActionListener(new OpenButtonListener());
		displayButton.addActionListener(new DisplayButtonListener());

		// North panel
		JPanel northPanel = new JPanel();

		northPanel.add(new JLabel("File name: "));
		northPanel.add(fileNameTextField);
		northPanel.add(openButton);

		// West panel
	    JPanel westPanel= new JPanel(new BorderLayout());
		westPanel.add(numberOfEntriesLabel,BorderLayout.CENTER);
		westPanel.add(new JScrollPane(namesList), BorderLayout.NORTH);
		westPanel.add(displayButton, BorderLayout.SOUTH);

		// Center panel
		JPanel centerPanel = new JPanel();
		JPanel infoPanel = new JPanel(new BorderLayout());
		GridLayout layout = new GridLayout(3, 1);
		JPanel labelsPanel = new JPanel(layout);
		JPanel valuesPanel = new JPanel(layout);

		layout.setVgap(10);
		labelsPanel.add(new JLabel ("Name: "));
		labelsPanel.add(new JLabel ("Address: "));
		labelsPanel.add(new JLabel("Telephone: "));
		valuesPanel.add(nameTextField);
		valuesPanel.add(addressTextField);
		valuesPanel.add(telephoneTextField);
		infoPanel.add(labelsPanel, BorderLayout.WEST);
		infoPanel.add(valuesPanel, BorderLayout.CENTER);
		centerPanel.add(infoPanel);

		// Arrange panels in window
		setLayout(new BorderLayout());
		add(northPanel, BorderLayout.NORTH);
		add(westPanel, BorderLayout.WEST);
		add(centerPanel, BorderLayout.CENTER);
		add(statusTextArea, BorderLayout.SOUTH);

		addressBook = new AddressBook();
	}

	/**
	 * This inner class handles <code>openButton</code> events.
	 */
	class OpenButtonListener implements ActionListener {

		/**
		 * Loads address book data from the specified file and displays
		 * the names in a list. Also displays, beneath the list, the number2
		 * of names in the address book.
		 *
		 * @param event  the event object.
		 */
		public void actionPerformed(ActionEvent event)  {

	         try {
	                
	               String file = fileNameTextField.getText();
	               BufferedReader  input = 
	                			new BufferedReader(new FileReader(file));
	              
	               /* Removing all entries in the address book if it has any. */
	               addressBook.removeAllEntries();
	              
	               /* Clearing the status area. */
	               statusTextArea.removeAll();
	                    
	               /* Read the first line in the specified file. */
	               String  line = input.readLine();
	                    
	           	   /* The information of the person in the address book. */
                   String name = "",
             	   	      address = "",
             	   		  telephone = "";
                   
          	      /* Load the data of the specified file into the empty address book. */
                  while (line != null)  {
                    		
                	  StringTokenizer tokenizer = 
                		  			new StringTokenizer(line, DELIM);
                    		
                   		if( tokenizer.countTokens() != 3 ) {
	                    	
                   			/* A line does not have the expected number of tokens. */
                   			statusTextArea.setText( "Invalid input data in the file "+"\""+file+"\".");
                   		
                   		} else {
                   			
                   			/* Load the data of the current line into the now-empty address book. */
	                   		name = tokenizer.nextToken();
	                   		address = tokenizer.nextToken();
	                   		telephone = tokenizer.nextToken();
	                    		
	                   		AddressBookEntry addressBookEntry = 
	                   						new AddressBookEntry(name,address,telephone);
	                   		addressBook.addEntry( addressBookEntry );
                    	}
                   	
                   		/* Read next line in the specified file. */
	                   	line = input.readLine();
                   	}
                    
                   /* Close the file. */
	               input.close();
	                    
	               /* Display the names of the people in the names list. */
	               namesList.setListData( addressBook.getNames() );
	               
	               /* Update the label that displays the number of people in the address book. */
	               numberOfEntriesLabel.setText( addressBook.getNumberOfEntries()+"entries" );
	                  
	               /* Clears nameTextField, addressTextField, and telephoneTextField. */
	               nameTextField.removeAll();
	               addressTextField.removeAll();
	               telephoneTextField.removeAll();
	                    
	        } catch(FileNotFoundException fnfn) {
	        	
	        	/* The specified file does not exist. */
	           	 statusTextArea.setText( "The file does not exist." );
	           	 
	        } catch (IOException ioe) {
	        	
	        	/* An error occurs while reading data from the specified file. */
	           	 statusTextArea.setText( ioe.toString() );
	        }
	        
		}
	}

	/**
	 * This inner class handles <code>displayButton</code> events.
	 */
	class DisplayButtonListener implements ActionListener {

		/**
		 * Displays the address book entry for the selected person.
		 *
		 * @param event  the event object.
		 */
		public void actionPerformed(ActionEvent event) {

			if( addressBook.getNumberOfEntries() == 0 ) {
			
				/* The address book is empty. */
				statusTextArea.setText( "The address book is empty." );
		
			} else if( namesList.isSelectionEmpty() ) {
				
				/* The user has not selected a name. */
				statusTextArea.setText( "Please selected a name." );
			
			} else if ( ! namesList.getValueIsAdjusting() 
					&& namesList.getSelectedIndex() != -1 ) {
				
			    	/* The name of the selected person in the names list. */
					String name = (String) namesList.getSelectedValue();
					
					/* An object of {@link AddressBookEntry} that contains 
					 * information of the specified person.
					 */
					AddressBookEntry addrBookEntry = addressBook.getEntry( name );
					
					/* Display the contact information for the selected name. */
					nameTextField.setText( addrBookEntry.getName() );
					addressTextField.setText( addrBookEntry.getAddress() );
					telephoneTextField.setText( addrBookEntry.getTelephone() );
					
					/* Display a status message for the action. */
					statusTextArea.setText( name + " has been displayed." );
			}
		}
	}
}