import java.awt.Cursor;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.net.URL;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

/**
 * 无标题栏、无框窗口，皮肤自定义
 */
public class PicFrame extends JFrame {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private Point loc = null;
	private Point tmp = null;
	private boolean isDragged = false;
	private JLabel pic;

	public PicFrame() {
		pic = new JLabel();
		pic.setIcon(getIcon("theme.jpg"));
		pic.setBounds(0, 0, 510, 290);

		// 初始化窗体
		setResizable(false);
		// 将窗体设置成无标题栏的语句，setUndecorated();注意此语句一定要放在setVisible之前，否则会报错
		setUndecorated(true);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setSize(510, 290);
		setVisible(true);
		add(pic);

		// 设置窗体为屏幕的中央位置
		int w = (Toolkit.getDefaultToolkit().getScreenSize().width - 510) / 2;
		int h = (Toolkit.getDefaultToolkit().getScreenSize().height - 290) / 2;
		this.setLocation(w, h);

		// 为窗体添加鼠标事件
		this.addMouseListener(new java.awt.event.MouseAdapter() {
			public void mouseReleased(MouseEvent e) {
				isDragged = false;
				// 为指定的光标设置光标图像
				setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
			}

			public void mousePressed(MouseEvent e) {
				tmp = new Point(e.getX(), e.getY());
				isDragged = true;
				setCursor(new Cursor(Cursor.MOVE_CURSOR));
			}
		});

		this.addMouseMotionListener(new MouseMotionAdapter() {
			// 鼠标按键在组件上按下并拖动时调用。
			public void mouseDragged(MouseEvent e) {
				if (isDragged) {
					loc = new Point(getLocation().x + e.getX() - tmp.x,
							getLocation().y + e.getY() - tmp.y);
					setLocation(loc);
				}
			}
		});
	}

	// 获取图片的方法
	public Icon getIcon(String path) {
		URL url = PicFrame.class.getClassLoader().getResource(path);
		return new ImageIcon(url);
	}

	public static void main(String[] args) {

		new PicFrame();

	}

}