java 拖控件 java实现拖拽式代码开发

package ibees.desktop;  
  
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.List;  
import javax.swing.JTextArea;  
  
/** 
 * @author Administrator 
 */  
public class DropDragSupportTextArea extends JTextArea implements DropTargetListener{  
    private DropTarget dropTarget;  
  
    public DropDragSupportTextArea() {  
        //注册DropTarget，并将它与组件相连，处理哪个组件的相连  
        //即连通组件（第一个this）和Listener(第二个this)  
        dropTarget = new DropTarget(this,DnDConstants.ACTION_COPY_OR_MOVE, this, true);  
    }  
      
    /** 
     * 拖入文件或字符串,这里只说明能拖拽，并未打开文件并显示到文本区域中 
     */  
    @Override
    public void dragEnter(DropTargetDragEvent dtde) {  
        DataFlavor[] dataFlavors = dtde.getCurrentDataFlavors();  
        if(dataFlavors[0].match(DataFlavor.javaFileListFlavor)){  
            try {  
                Transferable tr = dtde.getTransferable();  
                Object obj = tr.getTransferData(DataFlavor.javaFileListFlavor);  
                List<File> files = (List<File>)obj;  
                for(int i = 0; i < files.size(); i++){  
                    append(files.get(i).getAbsolutePath()+"\r\n");  
                }  
            } catch (UnsupportedFlavorException ex) {  
  
            } catch (IOException ex) {  
  
            }  
        }  
    }  
  
    public void dragOver(DropTargetDragEvent dtde) {  
        
    }  
  
    public void dropActionChanged(DropTargetDragEvent dtde) {  
         
    }  
  
    public void dragExit(DropTargetEvent dte) {  
          
    }  
  
    public void drop(DropTargetDropEvent dtde) {  
          
    }  
  
}