java swing 拖拽文件夹_Java Swing 鼠标拖放文件 代码1
参考了http://www.javaworld.com/javaworld/javatips/jw-javatip97.html
自己改写了一下用于简单的实现文件拖入，红色的部分为比较关键的代码，
主要是用netbeans生成的。
经过测试是没有问题的。
代码：
/*
* NewJFrame.java
*
* Created on 2008年2月2日, 上午11:06
*/
package yyplayer;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import javax.swing.JTextArea;
/**
*
* @author Administrator
*/
public class NewJFrame extends javax.swing.JFrame {
/** Creates new form NewJFrame */
public NewJFrame() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
//
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new MyTextArea();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);
getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);
pack();
}//
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}
class MyTextArea extends JTextArea implements DropTargetListener{
public MyTextArea(){
new DropTarget(this, DnDConstants.ACTION_COPY_OR_MOVE, this);
}
public void dragEnter(DropTargetDragEvent dtde) {
}
public void dragOver(DropTargetDragEvent dtde) {
}
public void dropActionChanged(DropTargetDragEvent dtde) {
}
public void dragExit(DropTargetEvent dte) {
}
public void drop(DropTargetDropEvent dtde) {
try {
Transferable tr = dtde.getTransferable();
if (dtde.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
System.out.println("file cp");
List list = (List) (dtde.getTransferable()
.getTransferData(DataFlavor.javaFileListFlavor));
Iterator iterator = list.iterator();
while (iterator.hasNext()) {
File f = (File) iterator.next();
this.setText(f.getAbsolutePath());
}
dtde.dropComplete(true);
this.updateUI();
}else {
dtde.rejectDrop();
}
} catch (IOException ioe) {
ioe.printStackTrace();
} catch (UnsupportedFlavorException ufe) {
ufe.printStackTrace();
}
}
}
// 变量声明 - 不进行修改
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
// 变量声明结束
}