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import java.io.File;
import javax.swing.*;
import javax.swing.filechooser.*;
/**
* <p>Title: 文件过滤器演示</p>
* <p>Description: FileChooserDemo文件使用的文件过滤器</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Filename: MyFilter.java</p>
* @version 1.0
*/
public class MyFilter extends FileFilter {
private String files;
public boolean accept(File f) {
if (f.isDirectory()) {
return true;
}
String extension = getExtension(f);
if (extension != null) {
if (extension.equals("java")) {//定义过滤Java文件
return true;
} else {
return false;
}
}
return false;
}
//过滤器描述
public String getDescription() {
return "Java";
}
/**
*<br>方法说明：获取文件扩展名
*<br>输入参数：
*<br>返回类型：
*/
public static String getExtension(File f) {
String ext = null;
String s = f.getName();
int i = s.lastIndexOf(´.´);
if (i > 0 && i < s.length() - 1) {
ext = s.substring(i+1).toLowerCase();
}
return ext;
}
}
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.*;
/**
* <p>Title: 文件对话框演示</p>
* <p>Description: 演示打开文件对话框和保存文件对话框，使用了文件过滤。</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Filename: FileChooserDemo.java</p>
* @version 1.0
*/
public class FileChooserDemo extends JPanel
implements ActionListener {
static private final String newline = "
";
JButton openButton, saveButton;
JTextArea log;
JFileChooser fc;
public FileChooserDemo() {
super(new BorderLayout());
log = new JTextArea(15,40);
log.setMargin(new Insets(10,10,10,10));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log);
//创建一个文件过滤，使用当前目录
fc = new JFileChooser(".");
//过滤条件在MyFilter类中定义
fc.addChoosableFileFilter(new MyFilter());
openButton = new JButton("打开文件",
createImageIcon("images/Open16.gif"));
openButton.addActionListener(this);
saveButton = new JButton("保存文件",
createImageIcon("images/Save16.gif"));
saveButton.addActionListener(this);
//构建一个面板，添加“打开文件”和“保存文件”
JPanel buttonPanel = new JPanel();
buttonPanel.add(openButton);
buttonPanel.add(saveButton);
add(buttonPanel, BorderLayout.PAGE_START);
add(logScrollPane, BorderLayout.CENTER);
}
/**
*<br>方法说明：事件处理
*<br>输入参数：
*<br>返回类型：
*/
public void actionPerformed(ActionEvent e) {
//当点击“打开文件”按钮
if (e.getSource() == openButton) {
int returnVal = fc.showOpenDialog(FileChooserDemo.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//在这里添加一些对文件的处理
log.append("打开文件: " + file.getName() + newline);
} else {
log.append("打开文件被用户取消！" + newline);
}
//点击“保存文件”按钮
} else if (e.getSource() == saveButton) {
int returnVal = fc.showSaveDialog(FileChooserDemo.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//在这里添加一些对文件的处理
log.append("保存文件: " + file.getName() + newline);
} else {
log.append("保存文件被用户取消！" + newline);
}
}
}
/**
*<br>方法说明：获取图像对象
*<br>输入参数：String path 图片路径
*<br>返回类型：ImageIcon 图片对象
*/
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = FileChooserDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn´t find file: " + path);
return null;
}
}
public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
//创建窗体
JFrame frame = new JFrame("FileChooserDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//创建一个面板
JComponent newContentPane = new FileChooserDemo();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
//显示窗体
frame.pack();
frame.setVisible(true);
}
}
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