工作需要，用java做一个网络硬盘出来,需要做到像磁盘一样文件拖入即上传的功能,不知道jsp有没有这种事件?
有这方面经验的兄弟请给点意见，只要有关,不论技术上,设计上，功能上的建议都行.先谢过!
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文件拖入，可以使用javascript 鼠标事件。
上传你可以搜索：ajax多线程上传
只是提供大家都知道的一些东西，具体实现，花时间我也就不弄了。
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这个有用到drag & drop，通过这种方式来确定文件源，看这个例子吧
- Java code
public class TopLevelTransferHandlerDemo extends JFrame { private static boolean DEMO = false; private JDesktopPane dp = new JDesktopPane(); private DefaultListModel listModel = new DefaultListModel(); private JList list = new JList(listModel); private static int left; private static int top; private JCheckBoxMenuItem copyItem; private JCheckBoxMenuItem nullItem; private JCheckBoxMenuItem thItem; private class Doc extends InternalFrameAdapter implements ActionListener { String name; JInternalFrame frame; TransferHandler th; JTextArea area; public Doc(File file) { this.name = file.getName(); try { init(file.toURI().toURL()); } catch (MalformedURLException e) { e.printStackTrace(); } } public Doc(String name) { this.name = name; init(getClass().getResource(name)); } private void init(URL url) { frame = new JInternalFrame(name); frame.addInternalFrameListener(this); listModel.add(listModel.size(), this); area = new JTextArea(); area.setMargin(new Insets(5, 5, 5, 5)); try { BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); String in; while ((in = reader.readLine()) != null) { area.append(in); area.append("\n"); } reader.close(); } catch (Exception e) { e.printStackTrace(); return; } th = area.getTransferHandler(); area.setFont(new Font("monospaced", Font.PLAIN, 12)); area.setCaretPosition(0); area.setDragEnabled(true); area.setDropMode(DropMode.INSERT); frame.getContentPane().add(new JScrollPane(area)); dp.add(frame); frame.show(); if (DEMO) { frame.setSize(300, 200); } else { frame.setSize(400, 300); } frame.setResizable(true); frame.setClosable(true); frame.setIconifiable(true); frame.setMaximizable(true); frame.setLocation(left, top); incr(); SwingUtilities.invokeLater(new Runnable() { public void run() { select(); } }); nullItem.addActionListener(this); setNullTH(); } public void internalFrameClosing(InternalFrameEvent event) { listModel.removeElement(this); nullItem.removeActionListener(this); } public void internalFrameOpened(InternalFrameEvent event) { int index = listModel.indexOf(this); list.getSelectionModel().setSelectionInterval(index, index); } public void internalFrameActivated(InternalFrameEvent event) { int index = listModel.indexOf(this); list.getSelectionModel().setSelectionInterval(index, index); } public String toString() { return name; } public void select() { try { frame.toFront(); frame.setSelected(true); } catch (java.beans.PropertyVetoException e) {} } public void actionPerformed(ActionEvent ae) { setNullTH(); } public void setNullTH() { if (nullItem.isSelected()) { area.setTransferHandler(null); } else { area.setTransferHandler(th); } } } private TransferHandler handler = new TransferHandler() { public boolean canImport(TransferHandler.TransferSupport support) { if (!support.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) { return false; } if (copyItem.isSelected()) { boolean copySupported = (COPY & support.getSourceDropActions()) == COPY; if (!copySupported) { return false; } support.setDropAction(COPY); } return true; } public boolean importData(TransferHandler.TransferSupport support) { if (!canImport(support)) { return false; } Transferable t = support.getTransferable(); try { java.util.List<File> l = (java.util.List<File>)t.getTransferData(DataFlavor.javaFileListFlavor); for (File f : l) { new Doc(f); } } catch (UnsupportedFlavorException e) { return false; } catch (IOException e) { return false; } return true; } }; private static void incr() { left += 30; top += 30; if (top == 150) { top = 0; } } public TopLevelTransferHandlerDemo() { super("TopLevelTransferHandlerDemo"); setJMenuBar(createDummyMenuBar()); getContentPane().add(createDummyToolBar(), BorderLayout.NORTH); JSplitPane sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, list, dp); sp.setDividerLocation(120); getContentPane().add(sp); //new Doc("sample.txt"); //new Doc("sample.txt"); //new Doc("sample.txt"); list.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION); list.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (e.getValueIsAdjusting()) { return; } Doc val = (Doc)list.getSelectedValue(); if (val != null) { val.select(); } } }); final TransferHandler th = list.getTransferHandler(); nullItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { if (nullItem.isSelected()) { list.setTransferHandler(null); } else { list.setTransferHandler(th); } } }); thItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { if (thItem.isSelected()) { setTransferHandler(handler); } else { setTransferHandler(null); } } }); dp.setTransferHandler(handler); } private static void createAndShowGUI(String[] args) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { } TopLevelTransferHandlerDemo test = new TopLevelTransferHandlerDemo(); test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); if (DEMO) { test.setSize(493, 307); } else { test.setSize(800, 600); } test.setLocationRelativeTo(null); test.setVisible(true); test.list.requestFocus(); } public static void main(final String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { //Turn off metal's use of bold fonts UIManager.put("swing.boldMetal", Boolean.FALSE); createAndShowGUI(args); } }); } private JToolBar createDummyToolBar() { JToolBar tb = new JToolBar(); JButton b; b = new JButton("New"); b.setRequestFocusEnabled(false); tb.add(b); b = new JButton("Open"); b.setRequestFocusEnabled(false); tb.add(b); b = new JButton("Save"); b.setRequestFocusEnabled(false); tb.add(b); b = new JButton("Print"); b.setRequestFocusEnabled(false); tb.add(b); b = new JButton("Preview"); b.setRequestFocusEnabled(false); tb.add(b); tb.setFloatable(false); return tb; } private JMenuBar createDummyMenuBar() { JMenuBar mb = new JMenuBar(); mb.add(createDummyMenu("File")); mb.add(createDummyMenu("Edit")); mb.add(createDummyMenu("Search")); mb.add(createDummyMenu("View")); mb.add(createDummyMenu("Tools")); mb.add(createDummyMenu("Help")); JMenu demo = new JMenu("Demo"); demo.setMnemonic(KeyEvent.VK_D); mb.add(demo); thItem = new JCheckBoxMenuItem("Use Top-Level TransferHandler"); thItem.setMnemonic(KeyEvent.VK_T); demo.add(thItem); nullItem = new JCheckBoxMenuItem("Remove TransferHandler from List and Text"); nullItem.setMnemonic(KeyEvent.VK_R); demo.add(nullItem); copyItem = new JCheckBoxMenuItem("Use COPY Action"); copyItem.setMnemonic(KeyEvent.VK_C); demo.add(copyItem); return mb; } private JMenu createDummyMenu(String str) { JMenu menu = new JMenu(str); JMenuItem item = new JMenuItem("[Empty]"); item.setEnabled(false); menu.add(item); return menu; }}