传输Android设备之间的文件吗？ [英] Transfer a file between Android devices?

问题描述

我在做一个code，我想送一个MP4文件到另一台Android设备。我已经达到了通过无线连接两个机器人从一个简单的周期，从1-20和其他Android设备读取，并显示被发送的数量写。

I'm making a code and I want to send a mp4 file to another Android device. I have reached to connect both Androids via Wifi and write from one a simple for cycle from 1-20 and the other Android device reads and displays the number that is sent.

这是发件人的有趣的部分：

Here it is the interesting part of the "sender":

                InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
                Log.d("ClientActivity", "C: Connecting...");
                Socket socket = new Socket(serverAddr, port);
                connected = true;
                while (connected) {
                    try {
                        Log.d("ClientActivity", "C: Sending command.");
                        PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket
                                    .getOutputStream())), true);


                        for (int i = 1; i < 20; i++) {


                            out.println(i);

                            i=i++;

和接收器：

serverSocket = new ServerSocket(SERVERPORT);

                        // listen for incoming clients
                        Socket client = serverSocket.accept();
     BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()),8*1024);

这个伟大的工程！但我想从一个设备发送文件到另一台，而不是一个int。我怎样才能让这个?????

This works great! But I want to send a file from one device to another instead of an int. How can I make this?????

推荐答案

您需要通过某种数据格式的数据流中包。这样做的一种方式是使用其通常用于在电子邮件发送附件的共同MIME数据格式。

You need to package the data to the stream through a some kind of data format. One way to do this is to use the common MIME data format which is commonly used to send attachment in email.

我已经回答了有关使用这种格式<一个通过套接字发送二进制其他问题href="http://stackoverflow.com/questions/7374481/android-add-filename-to-bytestream/7374554#7374554">the SO问题如下 - 机器人添加文件名以字节流。你可以检查接受答案这个问题。

I have answered other question related to sending binary via socket using this format in the following SO Question - android add filename to bytestream. You could check the accepted answer for that question.

有关您参考，我只是复制了code发送和通过接口从下面这个问题接受。

For your reference, I just copied the code for sending and receiving through socket from that question below.

File  f = new File(path);
BufferedOutputStream out = new BufferedOutputStream( socket.getOutputStream() );
String filename=path.substring(path.lastIndexOf("/")+1);

// create a multipart message
MultipartEntity multipartContent = new MultipartEntity();

// send the file inputstream as data
InputStreamBody isb = new InputStreamBody(new FileInputStream(f), "image/jpeg", filename);

// add key value pair. The key "imageFile" is arbitrary
multipartContent.addPart("imageFile", isb);

multipartContent.writeTo(out);
out.flush();
out.close();

而code读回用下面的 MimeBodyPart 即JavaMail的的一部分。

And the code to read it back below using MimeBodyPart that is part of JavaMail.

MimeMultipart multiPartMessage = new MimeMultipart(new DataSource() {
    @Override
    public String getContentType() {
        // this could be anything need be, this is just my test case and illustration
        return "image/jpeg";
    }

    @Override
    public InputStream getInputStream() throws IOException {
        // socket is the socket that you get from Socket.accept()
        BufferedInputStream inputStream = new BufferedInputStream(socket.getInputStream());
        return inputStream;
    }

    @Override
    public String getName() {
        return "socketDataSource";
    }

    @Override
    public OutputStream getOutputStream() throws IOException {
        return socket.getOutputStream();
    }
});

// get the first body of the multipart message
BodyPart bodyPart = multiPartMessage.getBodyPart(0);

// get the filename back from the message
String filename = bodyPart.getFileName();

// get the inputstream back
InputStream bodyInputStream = bodyPart.getInputStream();

// do what you need to do here....

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