将文件从操作系统拖放到 Java 应用程序 (Swing)

问题描述

首先让我说我一直在阅读 drag'n drop tutorial 和关于 SO 的类似问题，但不幸的是，我对这件事感到更加困惑.我想要实现的目标相对简单，所以我很惊讶它已经给我带来了这么多麻烦.我正在编写一个小型实用程序应用程序，它将一堆结果文件(自定义的 xml 类型)合并到一个大的制表符分隔的文本文件中.大多数功能已经编码，但是我想为它制作一个像样的 GUI.

Let me start by saying that I have been reading the drag'n drop tutorial and similar questions asked on SO, but unfortunately I have only gotten more confused about this matter. What I want to achieve is relatively simple so I am surprised that it got me in so much trouble already. I am writing a small utility application which will consolidate a bunch of result files (custom defined xml-type) into a large tab-separated text file. Most of the functionality is already coded, however I wanted to make a decent GUI for it.

我想要的是能够将文件拖放到组件中(例如 JTextArea)以一种很好的方式(阅读:不是完整路径，而是一个小图标和名称).我希望能够提供一个 JFileChooser 来浏览文件.然后我将依次解析文件以生成我想要的矩阵.

What I want is to be able to drag'n drop files into a component (for instance JTextArea) in a nice and gracious way (read: not full paths, but instead a small icon and name). I would like to be able to supply a JFileChooser to browse for files as well. I will then parse the files sequentially to produce the matrix I want.

到目前为止，我了解到该框架已经存在，但是任何其他功能都需要自定义构建.我在 Netbeans 中创建了一个测试 GUI，并试图将一堆文件拖到 JTextArea 上，但它们显示为文件路径，并且不可否认它看起来很丑陋.

What I have learned so far is that the framework is already there however any additional functionality needs to be custom built. I have created a test GUI in Netbeans and tried to drag a bunch of files onto a JTextArea, but they appear as file paths, and admittedly it looks very ugly.

我非常感谢有关如何以简洁的方式解决(或澄清)此问题的任何提示和指导.请注意，我确实打算在多个不同的操作系统(Mac、Win 和 Linux)上使用该软件.

I would really appreciate any tips and guidance on how to solve (or clarify) this problem in a neat way. Note that I do intend to use the software on multiple different OS (Mac,Win and Linux).

到目前为止，我的代码基于 Sun 教程中的一个示例，如下所示

the code I have so far is based on one of the examples from Sun tutorials and is as follows

import java.awt.datatransfer.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import javax.swing.*;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.border.TitledBorder;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.text.*;

public class ConsolidatorDemo extends JPanel implements ActionListener {
    private static final long serialVersionUID = -4487732343062917781L;
    JFileChooser fc;
    JButton clear;
    JTextArea dropZone, console;
    JSplitPane childSplitPane, parentSplitPane;
    PrintStream ps;

  public ConsolidatorDemo() {
    super(new BorderLayout());

    fc = new JFileChooser();;
    fc.setMultiSelectionEnabled(true);
    fc.setDragEnabled(true);
    fc.setControlButtonsAreShown(false);
    fc.setFileSelectionMode(JFileChooser.FILES_ONLY);               


    JPanel fcPanel = new JPanel(new BorderLayout());
    fcPanel.add(fc, BorderLayout.CENTER);

    clear = new JButton("Clear All");
    clear.addActionListener(this);
    JPanel buttonPanel = new JPanel(new BorderLayout());
    buttonPanel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
    buttonPanel.add(clear, BorderLayout.LINE_END);

    JPanel leftUpperPanel = new JPanel(new BorderLayout());
    leftUpperPanel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
    leftUpperPanel.add(fcPanel, BorderLayout.CENTER);
    leftUpperPanel.add(buttonPanel, BorderLayout.PAGE_END);


    JScrollPane leftLowerPanel = new javax.swing.JScrollPane();
    leftLowerPanel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
    dropZone = new JTextArea();
    dropZone.setColumns(20);
    dropZone.setLineWrap(true);
    dropZone.setRows(5);
    dropZone.setDragEnabled(true);
    dropZone.setDropMode(javax.swing.DropMode.INSERT);
    dropZone.setBorder(new TitledBorder("Selected files/folders"));
    leftLowerPanel.setViewportView(dropZone);

    childSplitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
            leftUpperPanel, leftLowerPanel);
    childSplitPane.setDividerLocation(400);
    childSplitPane.setPreferredSize(new Dimension(480, 650));

    console = new JTextArea();
    console.setColumns(40);
    console.setLineWrap(true);
    console.setBorder(new TitledBorder("Console"));

    parentSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
                    childSplitPane, console);
    parentSplitPane.setDividerLocation(480);
    parentSplitPane.setPreferredSize(new Dimension(800, 650));

    add(parentSplitPane, BorderLayout.CENTER);

}

public void setDefaultButton() {
    getRootPane().setDefaultButton(clear);
}

public void actionPerformed(ActionEvent e) {
    if (e.getSource() == clear) {
        dropZone.setText("");

    }
}

/**
 * Create the GUI and show it. For thread safety,
 * this method should be invoked from the
 * event-dispatching thread.
 */
private static void createAndShowGUI() {
    //Make sure we have nice window decorations.
    JFrame.setDefaultLookAndFeelDecorated(true);
    try {
      //UIManager.setLookAndFeel("de.javasoft.plaf.synthetica.SyntheticaBlackStarLookAndFeel");
        for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    }catch (Exception e){
      e.printStackTrace();
    }

    //Create and set up the window.
    JFrame frame = new JFrame("Consolidator!");
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

    //Create and set up the menu bar and content pane.
    ConsolidatorDemo demo = new ConsolidatorDemo();
    demo.setOpaque(true); //content panes must be opaque
    frame.setContentPane(demo);

    //Display the window.
    frame.pack();
    frame.setVisible(true);
    demo.setDefaultButton();
}

public static void main(String[] args) {
    //Schedule a job for the event-dispatching thread:
    //creating and showing this application's GUI.
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            createAndShowGUI();
        }
    });
}

推荐答案

这里有一个快速的片段，用于将实际的文件导入 JList(而不是将其字符串表示导入文本组件)并使用自定义渲染器来呈现它很好.它改编自 BasicDnD(在教程中):

here's a quick snippet to import the actual Files into a JList (as opposed to importing its String representation into a text component) and use a custom renderer to present it nicely. It's adapted from the BasicDnD (in the tutorial):

    fileDropper = new JList(new DefaultListModel());
    fileDropper.setDragEnabled(true);
    leftLowerPanel.setViewportView(fileDropper);

    TransferHandler handler =   new TransferHandler() {

        @Override
        public boolean canImport(TransferHandler.TransferSupport info) {
            // we only import FileList
            if (!info.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                return false;
            }
            return true;
        }

        @Override
        public boolean importData(TransferHandler.TransferSupport info) {
            if (!info.isDrop()) {
                return false;
            }

            // Check for FileList flavor
            if (!info.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                displayDropLocation("List doesn't accept a drop of this type.");
                return false;
            }

            // Get the fileList that is being dropped.
            Transferable t = info.getTransferable();
            List<File> data;
            try {
                data = (List<File>)t.getTransferData(DataFlavor.javaFileListFlavor);
            } 
            catch (Exception e) { return false; }
            DefaultListModel model = (DefaultListModel) fileDropper.getModel();
            for (File file : data) {
                model.addElement(file);
            }
            return true;
        }

        private void displayDropLocation(String string) {
            System.out.println(string);
        }
    };
    fileDropper.setTransferHandler(handler);
    fileDropper.setCellRenderer(new DefaultListRenderer(
          StringValues.FILE_NAME, IconValues.FILE_ICON));

无法拒绝显示 SwingX 渲染器配置 :-) 在核心 java 中，您可以手动完成，类似于

Couldn't resist to showing SwingX renderer config :-) In core java, you would do it manually, something like

   class MyRenderer extends DefaultListCellRenderer {

        @Override
        public Component getListCellRendererComponent(...) {
            super.getList...
            if (value instanceof File) {
                setText(FileSystemView.getFileSystemView().getDisplayName(value);
                setIcon(FileSystemView.getFileSystemView().getSystemIcon(value);
            } 
            return this;
        }

   }

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