Java 7：如何在Java中实现拖放？

Question

I am currently experimenting with drag&drop using Java 7 Update 21.

My target operating systems are:

• Windows 7
• Ubuntu 12.04
• Mac OSX 10.6 / 10.8

The requirements are:

• drag files from the filesystem and drop it to my Java application (making a copy of the file to a temporary directory) -> works for Linux & MacOSX & Windows

• drag e-mails from Thunderbird and drop them to my Java application (saving them as complete *.eml file on the filesystem)

The following code works with simple file drops to my application for Windows, MacOSX and Ubuntu. A further requirement is to drop e-mails from Thunderbird to my Java application (the mail is automatically converted to an *.eml file and stored to disk). This also works fine for Windows but I get a "Data Flavor not supported exception" in Ubuntu and MacOSX...

EDIT: I tried it with OpenJDK 7 on Ubuntu, but with that, even normal file drops doesn't work. Only with the JDK version of Oracle.

Does somebody has an idea how to fix / achieve that?

Many thanks in advance!

Here's a simple executeable sample:

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.DropTargetDropEvent;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.List;


public class DragDropTest extends javax.swing.JFrame {


    public DragDropTest() {
        initComponents();
        initDragAndDrop();
    }

    private void initDragAndDrop() {
        this.setDropTarget(new DropTarget(){
            @Override
            public synchronized void drop(DropTargetDropEvent dtde) {
                try {
                    Transferable transfer = dtde.getTransferable();
                    if(transfer.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                        dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                        List objects = (List)transfer.getTransferData(DataFlavor.javaFileListFlavor);
                        for(Object object : objects) {
                            if(object instanceof File) {
                                File source = (File)object;
                                File dest = new File(System.getProperty("user.home")+File.separator+source.getName());
                                Files.copy(Paths.get(source.getAbsolutePath()), Paths.get(dest.getAbsolutePath()), StandardCopyOption.REPLACE_EXISTING);
                                System.out.println("File copied from "+source.getAbsolutePath()+" to "+dest.getAbsolutePath());
                            }
                        }
                    } else if(transfer.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                        dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                        String type = (String)transfer.getTransferData(DataFlavor.stringFlavor);
                        System.err.println("Data flavor not supported: "+type);
                    } else {
                        System.err.println("Data flavor not supported.");
                    }
                } catch(UnsupportedFlavorException ex) {
                    System.err.println(ex.getMessage());
                } catch(IOException ex) {
                    System.err.println(ex.getMessage());
                } catch(Exception ex) {
                    System.err.println(ex.getMessage());
                } finally {
                    dtde.dropComplete(true);
                }
            }
        });
    }

    @SuppressWarnings("unchecked")                      
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Drag & Drop");
        setResizable(false);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 200, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 200, Short.MAX_VALUE)
        );

        pack();
    }                       

    public static void main(String args[]) {
        new DragDropTest().setVisible(true);
    }

}

Answer 1

Actually the problem is not in your Java code... It's a bug in ubuntu itself while Ubuntu Unity doesn't support Drag and Drop across two Windows (In your application between Mozilla Thunderbird and Java App). while it's possible to a drag and drop a file from the file system to a window..

To confirm this try to drag a mail file from Thunderbird to a browser windows as Gmail Attachment,,, it will not work.

To keep up with this bug review Bug updates in Ubuntu Bugs Launchpad from: https://bugs.launchpad.net/unity/+bug/995039

Answer 2

Instead of throwing, why not print out what data flavors you get on the transferable, and see if there is one you can use. Something like,

 else { 
      for(DataFlavor f : transfer.getTransferDataFlavors()) {
             System.out.println("flavor f:" + f + " type:" + f.getMimeType() + " javaClas:" + f.getDefaultRepresentationClass());  
      }
 }

Given the output of that, there is a good chance you can see how to save it to a file.

Answer 3

I guess the following link will give you idea about the problem :-

http://softwareisart.blogspot.in/2011/11/drag-and-drop-of-complex-custom-objects.html

Answer 4

Here's a work-around how I finally solved the problem for the moment.

1. if file-list-flavor is not supported, get imap URL from drop-event
2. open an imap connection with the provided information from the imap URL
3. open imap-store, imap-folder, search message by UID and finally fetch message
4. convert to *.eml format

Required libraries: Apache Commons I/O and Java Mail API

The following is the drop event implementation:

scrDocuments.setDropTarget(new DropTarget() {
        @Override
        public synchronized void drop(DropTargetDropEvent evt) {
            try {
                Transferable transfer = evt.getTransferable();
                if(transfer.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                    evt.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                    List objects = (List)transfer.getTransferData(DataFlavor.javaFileListFlavor);
                    for(Object object : objects) {
                        if(object instanceof File) {
                            File file = (File)object;
                            // store file ...
                        }
                    }
                } else {
                    try {
                        String url = fetchURL(evt, transfer);
                        ImapMessage eml = new ImapMessage(url);
                        File file = eml.fetchMessage();
                        // store file ...
                    } catch(Exception ex) {
                        System.err.println(ex.getMessage());
                    }
                }
            } catch(Exception ex) {
                System.err.println(ex.getMessage());
            } finally {
                evt.dropComplete(true);
            }
        }
    });

private String fetchURL(DropTargetDropEvent evt, Transferable transfer) throws IOException, UnsupportedEncodingException, UnsupportedFlavorException {
    for(DataFlavor flavor : transfer.getTransferDataFlavors()) {
        if(flavor.isRepresentationClassInputStream()) {
            if(flavor.getHumanPresentableName().equals("application/x-moz-file-promise-url")) {
                evt.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                BufferedReader reader = new BufferedReader(new InputStreamReader((InputStream)transfer.getTransferData(flavor), "ISO-8859-1"));
                String fAddress = reader.readLine();
                reader.close();
                return fAddress;
            }
        }
    }
    throw new IOException("No transferable object or stream found.");
}

And the following class looks-up the imap server and fetches the mail:

public class ImapMessage {

    private String authority;
    private String protocol;
    private String host;
    private int port;
    private String username;
    private String password;
    private String foldername;
    private long msgid;
    private String filename;
    private Message message;

    public ImapMessage(String url) throws IOException, MessagingException {
        parseURL(decodeURL(url));
    }

    @Override
    public String toString() {
        return "protocol: "+protocol+"\n"+
               "host: "+host+"\n"+
               "port: "+port+"\n"+
               "username: "+username+"\n"+
               "password: "+password+"\n"+
               "folder: "+foldername+"\n"+
               "msgid: "+msgid+"\n"+
               "filename: "+filename;
    }

    private String decodeURL(String url) throws IOException {
        if(url!=null && !url.isEmpty()) {
            String newurl = "";
            for(int i=0; i<url.length(); i+=2) {
                newurl+=url.substring(i, i+1);
            }
            newurl = StringUtils.replace(newurl, "%3E", ">");
            newurl = StringUtils.replace(newurl, "%20", " ");
            return newurl;
        } else {
            throw new IOException("The given URL is empty or invalid.");
        }
    }


    private void parseURL(String url) throws IOException, MalformedURLException {
        if(url!=null && !url.isEmpty()) {
            //<editor-fold defaultstate="collapsed" desc="Parse Protocol">
            if(url.startsWith("imaps")) {
                url = StringUtils.replace(url, "imaps", "http", 1);
                protocol = "imaps";
            } else if(url.startsWith("imap")) {
                url = StringUtils.replace(url, "imap", "http", 1);
                protocol = "imap";
            } else {
                throw new IOException("Unsupported protocol: "+url.substring(0, url.indexOf("://")));
            }

            try {
                URL newurl = new URL(url);
                String path = newurl.getPath();
                String query = newurl.getQuery();
                authority = newurl.getAuthority();
                host = newurl.getHost();
                port = newurl.getPort();
                username = newurl.getUserInfo();
                password = "provide your password here";
                foldername = path.substring(path.indexOf(">/")+2, path.lastIndexOf(">"));
                msgid = Long.parseLong(path.substring(path.lastIndexOf(">")+1, path.length()));
                filename = query.substring(query.indexOf("=")+1, query.length());
            } catch (MalformedURLException ex) {
                throw ex;
            }
        } else {
            throw new IOException("The given URL is empty or invalid.");
        }
    }

        public File fetchMessage() throws IOException, FileNotFoundException, MessagingException {

            Store store = null;
            Folder folder = null;
            File filepath = new File("/destination/directory");
            try {
                Properties props = System.getProperties();
                props.setProperty("mail.store.protocol", protocol);
                Session session = Session.getDefaultInstance(props, null);
                // session.setDebug(true);
                store = session.getStore(protocol);
                store.connect(host, port, username, password);
                folder = store.getFolder(foldername);
                folder.open(Folder.READ_ONLY);
                UIDFolder ufolder = (UIDFolder)folder;
                message = ufolder.getMessageByUID(msgid);
                if(message!=null) {
                    File file = null;
                    if(filename.equals("null")) {
                        file = new File(filepath.getAbsolutePath()+File.separator+Long.toString(System.nanoTime())+".eml");
                    } else {
                        file = new File(filepath.getAbsolutePath()+File.separator+filename);
                    }
                    message.writeTo(new FileOutputStream(file));
                    return file;
                } else {
                    throw new MessagingException("The requested e-mail could not be found on the mail server.");
                }
            } catch(Exception ex) {
                throw ex;
            } finally {
                if(folder!=null) {
                    folder.close(true);
                }
                if(store!=null) {
                    store.close();
                }
            }
        }

    }