Java6学习笔记9——利用Swing开发文件打开和保存对话框

www.diy567.com累了，去上面休息一下下,QQ空间，美文，非主流，网络日记，搞笑短信，祝福短信，热门短信，有意思啊

 

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileNameExtensionFilter;
import java.io.File;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class FileOpen extends JFrame implements ActionListener {
JFileChooser chooser;
FileFilter filter;
public static void main(String arg[]) {
new FileOpen();
}
public FileOpen() {
JButton button;
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
} );
setLocation(250,150);
Container pane = getContentPane();
pane.setLayout(new FlowLayout());
button = new JButton("Open");
button.addActionListener(this);
pane.add(button);
button = new JButton("Save");
button.addActionListener(this);
pane.add(button);
pack();

chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);//设置选择模式，既可以选择文件又可以选择文件夹
String extj[] = { "jpeg","jpg" };
filter = new FileNameExtensionFilter( "JPEG Image",extj);
chooser.setFileFilter(filter);//设置文件后缀过滤器
String extt[] = { "tiff","tif" };
filter = new FileNameExtensionFilter( "TIFF Image",extt);
chooser.setFileFilter(filter);

setVisible(true);
}
public void actionPerformed(ActionEvent e) {
int retval;
String selection = e.getActionCommand();
if(selection.equals("Open")) {
retval = chooser.showOpenDialog(this);//显示"保存文件"对话框
if(retval == JFileChooser.APPROVE_OPTION) {//若成功打开
File file = chooser.getSelectedFile();//得到选择的文件名
System.out.println("File to open " + file);
}
} else if(selection.equals("Save")) {
File file = new File("mongrove.tiff");
chooser.setSelectedFile(file);//设置默认文件名
retval = chooser.showSaveDialog(this);//显示“保存文件”对话框
if(retval == JFileChooser.APPROVE_OPTION) {
file = chooser.getSelectedFile();
System.out.println("File to save " + file);
}
}
}
}