GUI_文件管理器(练习)

实现想windows下的文件管理器（主要是监听器里的方法，showDir()写法）

package com.mywindow.test;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.File;

import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;


/**
* This code was edited or generated using CloudGarden's Jigloo
* SWT/Swing GUI Builder, which is free for non-commercial
* use. If Jigloo is being used commercially (ie, by a corporation,
* company or business for any purpose whatever) then you
* should purchase a license for each developer using Jigloo.
* Please visit www.cloudgarden.com for details.
* Use of Jigloo implies acceptance of these licensing terms.
* A COMMERCIAL LICENSE HAS NOT BEEN PURCHASED FOR
* THIS MACHINE, SO JIGLOO OR THIS CODE CANNOT BE USED
* LEGALLY FOR ANY CORPORATE OR COMMERCIAL PURPOSE.
*/
public class NewJFrame extends javax.swing.JFrame {
    private static final String LINE_SEPARATOR = System.getProperty("line.separator");
    private JTextField jTextField1;
    private JButton jButton1;
    private JTextArea jTextArea1;

    /**
    * Auto-generated main method to display this JFrame
    */
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                NewJFrame inst = new NewJFrame();
                inst.setLocationRelativeTo(null);
                inst.setVisible(true);
            }
        });
    }
    
    public NewJFrame() {
        super();
        initGUI();
    }
    
    private void initGUI() {
        try {
            setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
            getContentPane().setLayout(null);
            {
                jTextField1 = new JTextField();
                getContentPane().add(jTextField1, "Center");
                jTextField1.setBounds(12, 27, 268, 27);
                jTextField1.addKeyListener(new KeyAdapter() {
                    public void keyPressed(KeyEvent evt) {
                        jTextField1KeyPressed(evt);
                    }
                });
            }
            {
                jButton1 = new JButton();
                getContentPane().add(jButton1);
                jButton1.setText("u8f6cu5230");
                jButton1.setBounds(292, 28, 76, 24);
                jButton1.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent evt) {
                        jButton1ActionPerformed(evt);
                    }
                });
            }
            {
                jTextArea1 = new JTextArea();
                getContentPane().add(jTextArea1);
                jTextArea1.setBounds(12, 65, 356, 185);
            }
            pack();
            setSize(400, 300);
        } catch (Exception e) {
            //add your error handling code here
            e.printStackTrace();
        }
    }
    
    //Button的活动监听器
    private void jButton1ActionPerformed(ActionEvent evt) {
        showDir();
    }

    private void showDir() {
        /*
         * 通过点击按钮获取文本框目录
         * 将目录中的内容显示到文本区域中
         * */
        String dir_str = jTextField1.getText();
        
        File dir = new File(dir_str);
        
        if(dir.exists() && dir.isDirectory()){
            jTextArea1.setText("");
            
            String[] names = dir.list();
            
            for(String name : names){
                jTextArea1.append(name+LINE_SEPARATOR);
            }
        }
    }
    
    private void jTextField1KeyPressed(KeyEvent evt) {
        
        if(evt.getKeyCode()==KeyEvent.VK_ENTER){
            showDir();
        }
            
    }

}