Java鼠标拖放功能的实现源码

package jdraganddropdemo; //Download by http://www.codefans.net import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.awt.datatransfer.*; import java.awt.dnd.*; public class MainFrame extends JFrame implements DropTargetListener { private JPanel contentPane; private BorderLayout borderLayout1 = new BorderLayout(); private JTextField jTextField1 = new JTextField(); DragJLabel label = new DragJLabel("Hello World !",SwingConstants.CENTER); //Construct the frame public MainFrame() { enableEvents(AWTEvent.WINDOW_EVENT_MASK); try { jbInit(); } catch(Exception e) { e.printStackTrace(); } } //Component initialization private void jbInit() throws Exception { //setIconImage(Toolkit.getDefaultToolkit().createImage(MainFrame.class.getResource("[Your Icon]"))); contentPane = (JPanel) this.getContentPane(); contentPane.setLayout(borderLayout1); this.setSize(new Dimension(410, 114)); this.setTitle("JDragAndDropDemo"); jTextField1.setFont(new java.awt.Font("Dialog", 0, 14)); contentPane.add(jTextField1, BorderLayout.SOUTH); contentPane.add(this.label,BorderLayout.NORTH); new DropTarget(this.jTextField1,DnDConstants.ACTION_COPY_OR_MOVE,this); } //Overridden so we can exit when window is closed protected void processWindowEvent(WindowEvent e) { super.processWindowEvent(e); if (e.getID() == WindowEvent.WINDOW_CLOSING) { System.exit(0); } } public void dragEnter(DropTargetDragEvent dtde) { /**@todo Implement this java.awt.dnd.DropTargetListener method*/ //throw new java.lang.UnsupportedOperationException("Method dragEnter() not yet implemented."); } public void dragOver(DropTargetDragEvent dtde) { /**@todo Implement this java.awt.dnd.DropTargetListener method*/ //throw new java.lang.UnsupportedOperationException("Method dragOver() not yet implemented."); } public void dropActionChanged(DropTargetDragEvent dtde) { /**@todo Implement this java.awt.dnd.DropTargetListener method*/ //throw new java.lang.UnsupportedOperationException("Method dropActionChanged() not yet implemented."); } public void dragExit(DropTargetEvent dte) { /**@todo Implement this java.awt.dnd.DropTargetListener method*/ //throw new java.lang.UnsupportedOperationException("Method dragExit() not yet implemented."); } public void drop(DropTargetDropEvent dtde) { /**@todo Implement this java.awt.dnd.DropTargetListener method*/ //throw new java.lang.UnsupportedOperationException("Method drop() not yet implemented."); try{ Transferable tr = dtde.getTransferable(); if (dtde.isDataFlavorSupported(DataFlavor.stringFlavor)){ dtde.acceptDrop(dtde.getDropAction()); String s = (String) tr.getTransferData(DataFlavor.stringFlavor); this.jTextField1.setText(this.jTextField1.getText()+s); dtde.dropComplete(true); }else{ dtde.rejectDrop(); } }catch(Exception err){ err.printStackTrace(); } } }