java从入门到精髓 -Swing高级JFileFilterTest FileFilter

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);
    }

}