《Java编程思想》读书笔记（10）

package com.vitamin.UI;
import javax.swing.*;
import javax.swing.filechooser.FileFilter;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.*;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import com.vitamin.Console.*;

public class FileTest extends JFrame
{
    private JButton btnOpen = new JButton("Open");
    private JButton btnSave = new JButton("Save");
    private JPanel p = null;
    private JTextField tfDir = new JTextField();
    private JTextField tfFileName = new JTextField();
    private JScrollPane sp = new JScrollPane();
    private JEditorPane ep = new JEditorPane();
    private File file = null;
    
    public FileTest() 
    {
        super();
        // TODO Auto-generated constructor stub
        this.initForm();
    }
    
    public void initForm()
    {
        Container con = this.getContentPane();
        con.setLayout(new BorderLayout());
        this.tfDir.setEditable(false);
        this.tfFileName.setEditable(false);
        this.btnSave.setEnabled(false);
        
        this.btnOpen.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e)
             {
                 JFileChooser fc = new JFileChooser();
                 fc.setFileFilter(new TextFileFilter() );
                int returnVal =  fc.showOpenDialog(FileTest.this);
                if(returnVal == JFileChooser.APPROVE_OPTION)
                {
                    file = fc.getSelectedFile();
                    try
                    {
                        ep.setPage(file.toURL());
                        tfFileName.setText(file.getAbsolutePath());
                        btnSave.setEnabled(true);
                    }
                    catch(IOException ex)
                    {
                         throw new RuntimeException(ex);
                    }
                    
                }
                else if(returnVal == JFileChooser.CANCEL_OPTION)
                {
                    tfFileName.setText("你已经取消了文件的选择");
                }
             }        
        });
        
        this.btnSave.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent e)
               {
                     try {
                          FileWriter fw = new FileWriter(file);
                          ep.write(fw);
                          JOptionPane.showMessageDialog(FileTest.this,"保存成功");
                        } catch (IOException ioe) {
                          throw new RuntimeException(ioe);
                        }
               }
        });
        sp.getViewport().add(ep);
        
        p = new JPanel();
        p.add(this.btnOpen);
        p.add(this.btnSave);
        con.add(p,BorderLayout.SOUTH);        
        con.add(sp,BorderLayout.CENTER);
        p = new JPanel();
        p.setLayout(new GridLayout(2,1));
        p.add(this.tfDir);
        p.add(this.tfFileName);
        con.add(p,BorderLayout.NORTH);
        console.run(this,400,400);    
    }
      public class TextFileFilter extends
        javax.swing.filechooser.FileFilter {
        public boolean accept(File f) {
          return f.getName().endsWith(".txt")
            || f.isDirectory();
        }
        public String getDescription() {
          return "Text Files (*.txt)";
        }
      }
    /**//**
     * @param args
     */
    public static void main(String[] args) 
    {
        FileTest ft = new FileTest();

    }

}

做了个读写文件的小东西，功能很烂，有时间做个完整的记事本吧。