jfilechooserdemo.java

这是一个简单的图书管理系统,适用于教学中演示,讲解java高级编程语言

package helpfile;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.File;
public class JFileChooserDemo extends JFrame implements ActionListener
{
	private JFileChooser fileChooser = null;
	private JTextArea    textArea;
	private JMenuBar menuBar;
    private JMenuItem    openItem;
    
    public JFileChooserDemo()
    { 
    	super("文件选择对话框");
        setSize(300, 200);       
		try
		{    //设置外观
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		}catch(Exception e){}
		
        //获取内容面板
        Container container = getContentPane();
        
        textArea = new JTextArea();
    	textArea.setFont(new Font("Serif", Font.PLAIN, 14));
    	container.add(new  JScrollPane(textArea));
    	
        //建立菜单栏
    	menuBar  = new JMenuBar();
    	JMenu menu = new JMenu("文件");
    	openItem = new JMenuItem("打开");
    	openItem.addActionListener(this);
    	
    	//设置字体 
    	menu.setFont(new Font("Serif", Font.PLAIN, 12));
    	openItem.setFont(new Font("Serif", Font.PLAIN, 12));
    	
    	menu.add(openItem);
    	menuBar.add(menu);
    	
    	setJMenuBar(menuBar);
        
        //设置打开文件为对话框的默认路径
        fileChooser = new JFileChooser("D:");
        fileChooser.setApproveButtonText("确定");
        fileChooser.setDialogTitle("打开文件");
        
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }	
  
    public static void main(String[] args)
    {
  	    JFileChooserDemo application = new JFileChooserDemo();
    }
  
    public void actionPerformed(ActionEvent e)
    {
  	    int result=fileChooser.showOpenDialog(this);
  	    if (result==JFileChooser.APPROVE_OPTION)
  	    {
  	    	File file=fileChooser.getSelectedFile();
  	    	textArea.append("你选择了文件: " + file.getName() + "\n");
  	    } 
  	    else if(result == JFileChooser.CANCEL_OPTION)
  	    {
            textArea.append("您没有选择任何文件\n");
        }
  	}
}