Java从入门到精通 - Swing高级JFileFilterTest FileFilter只选择gif,jpg格式

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.filechooser.*;
import javax.swing.*;
public class JFileFilterTest extends JFrame{

 
 public JFileFilterTest() {
  super();
  setTitle("表格");
  setBounds(100,100,350,150);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  final JButton button = new JButton();
  final JLabel label = new JLabel("双击选择照片",SwingConstants.CENTER);
  label.addMouseListener(new MouseAdapter(){  //适配器
   public void mouseClicked(MouseEvent e){
    if(e.getClickCount()==2){   //双击事件
     JFileChooser fileChooser = new JFileChooser();
     FileFilter filter = new FileFilter() {

      //要过滤的文件
      public boolean accept(File f) {
      //显示的文件类型
      if (f.isDirectory()) {
      return true;
      }
      //显示满足条件的文件
      return f.getName().endsWith(".jpg") || f.getName().endsWith(".gif");
      }

      /**
      * 这就是显示在打开框中
      */
      public String getDescription() {

      return "*.jpg,*.gif";
      }
      };
     //jdk1.6 FileNameExtensionFilter
     //new FileNameExtensionFilter("图像文件(jpg/gif)","jpg","jpeg","gif");
     fileChooser.setFileFilter(filter);
     int i = fileChooser.showOpenDialog(getContentPane());  //opendialog
     if(i==JFileChooser.APPROVE_OPTION)  //判断是否为打开的按钮
     {
      File selectedFile = fileChooser.getSelectedFile();  //取得选中的文件
      //label.setText(selectedFile.getPath());   //取得路径
      label.setIcon(new ImageIcon(selectedFile.getAbsolutePath()));   //将图片显示在标签上
     }
    }
   }
  });
  
  getContentPane().add(button,BorderLayout.NORTH);  //布局处理
  getContentPane().add(label,BorderLayout.CENTER);
  button.setText("上传");
 }

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  JFileFilterTest jFileFilterTest= new JFileFilterTest();
  jFileFilterTest.setVisible(true);
 }

}