201009120_Dawning_JFileChooser

package com.swing.demo;import java.awt.Dimension;import java.awt.EventQueue;import java.awt.Image;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.beans.PropertyChangeEvent;import java.beans.PropertyChangeListener;import java.io.File;import javax.swing.BorderFactory;import javax.swing.Icon;import javax.swing.ImageIcon;import javax.swing.JFileChooser;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.filechooser.FileNameExtensionFilter;import javax.swing.filechooser.FileView;/** * * 基于Java图形界面 图片上传 * * FleNameExtensionFilter 过滤文件上传 * PropertyChangeListener 监听某个控件发生改变是触发事件 * * @author Administrator * */public class FileChooserTest {public static void main(String[] agrs){EventQueue.invokeLater(new Runnable(){public void run() {ImageViewerFrame frame = new ImageViewerFrame();frame.setDefaultCloseOperation(3);frame.setVisible(true);}});}}class ImageViewerFrame extends JFrame{public ImageViewerFrame(){setTitle("FileChooserTest");setSize(500,300);JMenuBar menuBar = new JMenuBar();setJMenuBar(menuBar);JMenu menu = new JMenu("File");menuBar.add(menu);JMenuItem openItem = new JMenuItem("Open");menu.add(openItem);openItem.addActionListener(new FileOpenListener());JMenuItem exitItem = new JMenuItem("Exit");menu.add(exitItem);exitItem.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e) {System.exit(0);}});label = new JLabel();add(label);chooser = new JFileChooser();//过滤上传的文件FileNameExtensionFilter filter = new FileNameExtensionFilter("Image files","jpeg","jpg","gif");chooser.setFileFilter(filter);chooser.setAccessory(new ImagePreviewer(chooser));chooser.setFileView(new FileIconView(filter,new ImageIcon("palette.gif")));}private class FileOpenListener implements ActionListener{public void actionPerformed(ActionEvent e) {chooser.setCurrentDirectory(new File("."));//show file chooser d dialogint result = chooser.showOpenDialog(ImageViewerFrame.this);//if image file accepted set it as icon of the labelif(result == JFileChooser.APPROVE_OPTION){//获取路径String name = chooser.getSelectedFile().getParent();label.setIcon(new ImageIcon(name));}}}private JLabel label;private JFileChooser chooser;}class FileIconView extends FileView{public FileIconView(FileNameExtensionFilter filter2,Icon anIcon){this.filter = filter2;this.icon = anIcon;}public Icon getIcon(File f){if(! f.isDirectory() && filter.accept(f))return icon;else return null;}private FileNameExtensionFilter filter;private Icon icon;}/* * 获取图片，并将图片映射到JLabel components 上 */class ImagePreviewer extends JLabel{public ImagePreviewer(JFileChooser chooser){setPreferredSize(new Dimension(100,100));setBorder(BorderFactory.createEtchedBorder());chooser.addPropertyChangeListener(new PropertyChangeListener(){public void propertyChange(PropertyChangeEvent ev) {if(ev.getPropertyName() == JFileChooser.SELECTED_FILE_CHANGED_PROPERTY){//the user has selected a new fileFile f = (File)ev.getNewValue();//可以根据名称和路径读取图像//System.out.println(f.getName());//System.out.println(f.getPath());if(f == null){setIcon(null);return;}//read the image into an iconImageIcon icon = new ImageIcon(f.getPath());//if the icon is too Target to fit , scale itif(icon.getIconWidth() > getWidth() )icon = new ImageIcon(icon.getImage().getScaledInstance(getWidth(), - 1,Image.SCALE_DEFAULT));setIcon(icon);}}});}}