最近因为在一个项目中要实现JTree之间的拖拽，刚刚学习开始学习Java，参照网上的代码完成的，现在贴出来共享，希望对和我一样的菜鸟有点帮助，有什么错误的话还请多多指正。
DragSourceTree.java
package aabbcc;
import javax.swing.JTree;
import java.awt.dnd.DragGestureListener;
import java.awt.dnd.DragSourceListener;
import java.awt.dnd.DragSourceDragEvent;
import java.awt.dnd.DragSourceEvent;
import java.awt.dnd.DragSourceDropEvent;
import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.DragSource;
import javax.swing.tree.DefaultMutableTreeNode;
import java.awt.datatransfer.StringSelection;
/**
* <p>Title: JTree之间的拖拽中的DragSourceTree</p>
* <p>Description:通过向从“源树”中拖拽结点在目标树中重新构造一棵树，实现JTree之间的拖拽单向拖拽，这个类是“源树”。 </p>
* @author awaysrain(绝对零度)
* @version 1.0
*/
public class DragSourceTree
extends JTree
implements DragGestureListener, DragSourceListener {
private DragSource dragSource = null;
/**
* Construct the source tree
*/
public DragSourceTree() {
super();
dragSource = DragSource.getDefaultDragSource();
dragSource.createDefaultDragGestureRecognizer(this,
java.awt.dnd.DnDConstants.
ACTION_COPY_OR_MOVE, this);
}
/**
* Construct the source tree
* @param treeNode DefaultMutableTreeNode
*/
public DragSourceTree(DefaultMutableTreeNode treeNode) {
super(treeNode);
dragSource = DragSource.getDefaultDragSource();
dragSource.createDefaultDragGestureRecognizer(this,
java.awt.dnd.DnDConstants.
ACTION_COPY_OR_MOVE, this);
}
/**
* dragGestureRecognized
*
* @param dge DragGestureEvent
*/
public void dragGestureRecognized(DragGestureEvent dge) {
java.awt.Cursor cursor = null;
cursor = DragSource.DefaultCopyDrop; //set cursor
java.awt.Point jap = dge.getDragOrigin(); //drag point
int x = (int) jap.getX();
int y = (int) jap.getY();
javax.swing.tree.TreePath tp = this.getPathForLocation(x, y); //get drag node path
if (tp != null) {
DefaultMutableTreeNode node1 = (DefaultMutableTreeNode)
tp.getLastPathComponent(); //get drag node
serializableNode(node1); //Serializable node object
}
//event start
dge.startDrag(cursor, new StringSelection("drag"), this);
}
/**
* dragEnter
*
* @param dsde DragSourceDragEvent
*/
public void dragEnter(DragSourceDragEvent dsde) {
}
/**
* dragOver
*
* @param dsde DragSourceDragEvent
*/
public void dragOver(DragSourceDragEvent dsde) {
}
/**
* dropActionChanged
*
* @param dsde DragSourceDragEvent
*/
public void dropActionChanged(DragSourceDragEvent dsde) {
}
/**
* dragDropEnd
*
* @param dsde DragSourceDropEvent
*/
public void dragDropEnd(DragSourceDropEvent dsde) {
}
/**
* dragExit
*
* @param dse DragSourceEvent
*/
public void dragExit(DragSourceEvent dse) {
}
/**
*Serializable node
*
* @param node DefaultMutableTreeNode
*/
private void serializableNode(DefaultMutableTreeNode node) {
try {
java.io.FileOutputStream objfile = new java.io.FileOutputStream(
"DragNode.OBJ");
java.io.ObjectOutputStream p = new java.io.ObjectOutputStream(objfile);
p.writeObject(node);
p.flush();
objfile.close();
}
catch (java.io.IOException e) {
System.out.println(e.toString());
}
}
}
DragTargetTree.java
package aabbcc;
import javax.swing.JTree;
import java.awt.dnd.DropTargetListener;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTarget;
import java.io.*;
import java.io.*;
import javax.swing.tree.DefaultMutableTreeNode;
/**
* <p>Title: JTree之间的拖拽中的DragTargetTree</p>
* <p>Description:通过向从“源树”中拖拽结点在目标树中重新构造一棵树，实现JTree之间的拖拽单向拖拽，这个类是“目的树” </p>
* @author awaysrain(绝对零度)
* @version 1.0
*/
public class DragTargetTree
extends JTree
implements DropTargetListener {
/**
* Construct the target tree
*/
public DragTargetTree() {
super();
DropTarget dropTarget = new DropTarget(this,
java.awt.dnd.DnDConstants.
ACTION_COPY_OR_MOVE, this);
}
/**
* Construct the target tree
* @param treeNode DefaultMutableTreeNode
*/
public DragTargetTree(DefaultMutableTreeNode treeNode) {
super(treeNode);
DropTarget dropTarget = new DropTarget(this,
java.awt.dnd.DnDConstants.
ACTION_COPY_OR_MOVE, this);
}
/**
* dragEnter
*
* @param dtde DropTargetDragEvent
*/
public void dragEnter(DropTargetDragEvent dtde) {
}
/**
* dragOver
*
* @param dtde DropTargetDragEvent
*/
public void dragOver(DropTargetDragEvent dtde) {
}
/**
* dropActionChanged
*
* @param dtde DropTargetDragEvent
*/
public void dropActionChanged(DropTargetDragEvent dtde) {
}
/**
* drop
*
* @param dtde DropTargetDropEvent
*/
public void drop(DropTargetDropEvent dtde) {
dtde.acceptDrop(java.awt.dnd.DnDConstants.ACTION_COPY); //accept drop
java.awt.Point ap = dtde.getLocation(); // get event point
int x = (int) ap.getX();
int y = (int) ap.getY();
javax.swing.tree.DefaultMutableTreeNode parnode;
javax.swing.tree.TreePath tp = this.getPathForLocation(x, y);
if (tp != null) {
try {
//get drop tree node with treepath
javax.swing.tree.DefaultMutableTreeNode no1 =
(javax.swing.tree.DefaultMutableTreeNode) tp.getLastPathComponent();
parnode = no1;
int index = parnode.getChildCount();
// get drop tree mode
javax.swing.tree.DefaultTreeModel tm =
(javax.swing.tree.DefaultTreeModel)this.getModel();
javax.swing.tree.DefaultMutableTreeNode node2 =
new javax.swing.tree.DefaultMutableTreeNode();
node2 = readNode();
tm.insertNodeInto(node2, parnode, index);
}
catch (java.lang.Exception e) {
System.out.println(e.toString());
}
}
}
/**
* dragExit
*
* @param dte DropTargetEvent
*/
public void dragExit(DropTargetEvent dte) {
}
/**
*
* read the node
* @return DefaultMutableTreeNode
*/
private DefaultMutableTreeNode readNode() {
FileInputStream objfile = null;
try {
objfile = new java.io.FileInputStream("DragNode.OBJ");
ObjectInputStream q = new ObjectInputStream(objfile);
DefaultMutableTreeNode node = (DefaultMutableTreeNode) q.readObject();
return node;
}
catch (Exception ex) {
return null;
}
}
}
Demo.java
package aabbcc;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
/**
* <p>Title: JTree之间的拖拽测试</p>
* <p>Description:通过向从“源树”中拖拽结点在目标树中重新构造一棵树，实现JTree之间的拖拽单向拖拽，这个类测试的类 </p>
* @author awaysrain(绝对零度)
*/
public class Demo extends JFrame {
JPanel contentPane;
JScrollPane jScrollPane1 = new JScrollPane();
XYLayout xYLayout1 = new XYLayout();
DragSourceTree jTree1 = new DragSourceTree();
JScrollPane jScrollPane2 = new JScrollPane();
DragTargetTree jTree2 = new DragTargetTree();
JLabel jLabel1 = new JLabel();
JLabel jLabel2 = new JLabel();
//Construct the frame
public Demo () {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
//Component initialization
private void jbInit() throws Exception {
contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(xYLayout1);
this.setSize(new Dimension(400, 300));
this.setTitle("Demo");
jLabel1.setFont(new java.awt.Font("DialogInput", 0, 16));
jLabel1.setText("源树");
jLabel2.setEnabled(true);
jLabel2.setFont(new java.awt.Font("DialogInput", 0, 16));
jLabel2.setDebugGraphicsOptions(0);
jLabel2.setDoubleBuffered(false);
jLabel2.setVerifyInputWhenFocusTarget(true);
jLabel2.setDisplayedMnemonic('0');
jLabel2.setText("目标树");
jLabel2.setVerticalAlignment(javax.swing.SwingConstants.CENTER);
jLabel2.setVerticalTextPosition(javax.swing.SwingConstants.CENTER);
contentPane.add(jLabel1, new XYConstraints(35, 8, 139, 27));
contentPane.add(jLabel2, new XYConstraints(214, 10, 149, 20));
contentPane.add(jScrollPane2, new XYConstraints(211, 31, 159, 231));
contentPane.add(jScrollPane1, new XYConstraints(25, 31, 153, 230));
jScrollPane1.getViewport().add(jTree1, null);
jScrollPane2.getViewport().add(jTree2, null);
}
//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);
}
}
}
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