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【Java】根据扩展名获取系统、文件图标

作者:火狼刘兴 / 发布于2013/9/10/ 607


	import java.io.File;
	import java.io.IOException;
	import java.awt.BorderLayout;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;
	import javax.swing.Icon;
	import javax.swing.ImageIcon;
	import javax.swing.JButton;
	import javax.swing.JFrame;
	import javax.swing.JPanel;
	import javax.swing.JTextField;
	import javax.swing.JLabel;
	import javax.swing.BoxLayout;
	import javax.swing.filechooser.FileSystemView;
	import sun.awt.shell.ShellFolder;

	public class FileIconExtractor extends JFrame implements ActionListener{
	private JButton getIconBtn = new JButton("get Icon");
	private JPanel iconPanel = new JPanel();
	private JTextField extField = new JTextField();
	private JLabel smallIconLabel = new JLabel("small Icon here");
	private JLabel bigIconLabel = new JLabel("big Icon here");

	public FileIconExtractor() {
	this.setSize(200, 150);
	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	this.setLayout(new BorderLayout());
	getIconBtn.setActionCommand("GETICON");
	getIconBtn.addActionListener(this);
	iconPanel.setLayout(new BoxLayout(iconPanel, BoxLayout.Y_AXIS));
	iconPanel.add(smallIconLabel);
	iconPanel.add(bigIconLabel);
	this.add(extField, BorderLayout.NORTH);
	this.add(iconPanel, BorderLayout.CENTER);
	this.add(getIconBtn, BorderLayout.SOUTH);
	this.setVisible(true);
	}

	public void actionPerformed(ActionEvent e) {
	if (e.getActionCommand().equals("GETICON")) {
	String ext = extField.getText();
	File file;
	try
	{
	 file = File.createTempFile("icon", "." + ext);
	 FileSystemView view = FileSystemView.getFileSystemView();
	 Icon smallIcon = view.getSystemIcon(file);
	 ShellFolder shellFolder = ShellFolder.getShellFolder(file);
	 Icon bigIcon = new ImageIcon(shellFolder.getIcon(true));
	 setIconLabel(smallIcon, bigIcon);
	 file.delete();
	}
	catch (IOException ioe)
	{
	ioe.printStackTrace();
	}
	}
	}

	private void setIconLabel(Icon smallIcon, Icon bigIcon) {
	smallIconLabel.setIcon(smallIcon);
	bigIconLabel.setIcon(bigIcon);
	}

	public static void main(String[] args) {
	FileIconExtractor fie = new FileIconExtractor();
	}
	}

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