拖拽文件获取文件路径

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拖曳文件获取文件路径

 

 

//拖拽获取文件路径package test;import java.awt.datatransfer.DataFlavor;import java.awt.datatransfer.Transferable;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.util.List;import javax.swing.JFrame;import javax.swing.JScrollPane;import javax.swing.JTextArea;/** * This is a test class to test drag and drop behavior. Drop items into the text * area to see the MIME types of the drop target. */public class Demo2 {    public static void main(String[] args) {        JFrame frame = new DropTargetFrame();        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        frame.setVisible(true);    }}/** * This frame contains a text area that is a simple drop target. */class DropTargetFrame extends JFrame {    public DropTargetFrame() {        setTitle("DropTarget");        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);        JTextArea textArea = new JTextArea("Drop items into this text area.\n");        new DropTarget(textArea, new TextDropTargetListener(textArea));        add(new JScrollPane(textArea), "Center");    }    private static final int DEFAULT_WIDTH = 300;    private static final int DEFAULT_HEIGHT = 300;}/** * This listener displays the properties of a dropped object. */class TextDropTargetListener implements DropTargetListener {    /**     * Constructs a listener.     *      * @param aTextArea     *            the text area in which to display the properties of the     *            dropped object.     */    public TextDropTargetListener(JTextArea aTextArea) {        textArea = aTextArea;    }    public void dragEnter(DropTargetDragEvent event) {        int a = event.getDropAction();        if ((a & DnDConstants.ACTION_COPY) != 0)            textArea.append("ACTION_COPY\n");        if ((a & DnDConstants.ACTION_MOVE) != 0)            textArea.append("ACTION_MOVE\n");        if ((a & DnDConstants.ACTION_LINK) != 0)            textArea.append("ACTION_LINK\n");        if (!isDragAcceptable(event)) {            event.rejectDrag();            return;        }    }    public void dragExit(DropTargetEvent event) {    }    public void dragOver(DropTargetDragEvent event) {        // you can provide visual feedback here    }    public void dropActionChanged(DropTargetDragEvent event) {        if (!isDragAcceptable(event)) {            event.rejectDrag();            return;        }    }    public void drop(DropTargetDropEvent event) {        if (!isDropAcceptable(event)) {            //拒绝 Drop。            event.rejectDrop();            return;        }        event.acceptDrop(DnDConstants.ACTION_COPY);        Transferable transferable = event.getTransferable();        DataFlavor[] flavors = transferable.getTransferDataFlavors();        for (int i = 0; i < flavors.length; i++) {            DataFlavor d = flavors[i];            textArea.append("MIME type=" + d.getMimeType() + "\n");            try {                if (d.equals(DataFlavor.javaFileListFlavor)) {                    List<File> fileList = (List<File>) transferable.getTransferData(d);                                        for (File f : fileList) {                        textArea.append(f + "\n");//                        System.out.println("是个文件夹");                    }                } else if (d.equals(DataFlavor.stringFlavor)) {                    String s = (String) transferable.getTransferData(d);                    textArea.append(s + "\n");                }            } catch (Exception e) {                textArea.append(e + "\n");            }        }        textArea.append("\n");        event.dropComplete(true);    }    public boolean isDragAcceptable(DropTargetDragEvent event) {        // usually, you check the available data flavors here        // in this program, we accept all flavors        return (event.getDropAction() & DnDConstants.ACTION_COPY_OR_MOVE) != 0;    }    public boolean isDropAcceptable(DropTargetDropEvent event) {        // usually, you check the available data flavors here        // in this program, we accept all flavors        return (event.getDropAction() & DnDConstants.ACTION_COPY_OR_MOVE) != 0;    }    private JTextArea textArea;}