import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.filechooser.*;

import java.io.File;

public class L extends JFrame

{

/**

* @param args

*/

public static void main(String[] args)throws Exception

{

new ConfigFrame("保存文件");

}

}

class ConfigFrame extends JFrame

{

private static final long serialVersionUID = 1L;

public ConfigFrame(String title)

{

//设置窗口属性

final int width = 300;

final int height = 200;

final Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();

final int left = (screen.width - width)/2;

final int top = (screen.height - height)/2;

this.setLocation(left, top);

this.setSize(width,height);

this.setTitle(title);

//添加组件

JPanel panel = new JPanel();

this.add(panel);

JButton b = new JButton("打开");

panel.add(b);

b.addActionListener(new

ActionListener()

{

public void actionPerformed(ActionEvent e)

{

JFileChooser chooser = new JFileChooser(".");

TxtFileFilter txtFilter = new TxtFileFilter();

JavaFileFilter javaFilter = new JavaFileFilter();

chooser.addChoosableFileFilter(txtFilter);

chooser.addChoosableFileFilter(javaFilter);

//设置默认的文件管理器。如果不设置,则最后添加的文件过滤器为默认过滤器,本例中为javaFilter

chooser.setFileFilter(txtFilter);

int rs = chooser.showSaveDialog(ConfigFrame.this);

}

});

this.setVisible(true);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

class JavaFileFilter extends FileFilter

{

public String getDescription()

{

return "*.java(java源文件)";

}

public boolean accept(File file)

{

String name = file.getName();

return name.toLowerCase().endsWith(".java");

}

}

class TxtFileFilter extends FileFilter

{

public String getDescription()

{

return "*.txt(文本文件)";

}

public boolean accept(File file)

{

String name = file.getName();

return name.toLowerCase().endsWith(".txt");

}

}

//打开和保存基本一样

2