Question

我正在创建一个简单的文件传输应用程序。将所选文件从一个设备发送到另一个设备。如果我知道要接收的文件名，它工作正常。

但如果我不知道文件名，那么就不会使用FileOutputStream在指定位置写入文件。

这是我的代码：

发件人：

        try {
        // create socket
        // TODO: the port should match the one in Client
        ServerSocket servsock = new ServerSocket(5005);
        while (true) {
            Log.i("************", "Waiting...");

            Socket sock = servsock.accept(); // blocks until connection opened
            Log.i("************", "Accepted connection : " + sock);

            // sendfile

            // TODO: put the source of the file
            File myFile = new File ("/mnt/sdcard/download/1.html");
            byte [] mybytearray  = new byte [(int)myFile.length()];
            Log.i("####### file length = ", String.valueOf(myFile.length()) );
            FileInputStream fis = new FileInputStream(myFile);
            BufferedInputStream bis = new BufferedInputStream(fis);
            bis.read(mybytearray,0,mybytearray.length);
            OutputStream os = sock.getOutputStream();
            String text = "1.html";
            byte[] bytes = text.getBytes("UTF-8");
            os.write(bytes);
            Log.i("************", "Sending...");
            os.write(mybytearray,0,mybytearray.length);
            os.flush();
            sock.close();
        }
    } catch (IOException e) {
        Log.i("Io execption ", "e: " + e);
    }

在发件人代码中，我已经指定了要发送给其他设备的文件。这是1.html，使用这一行：

File myFile = new File ("/mnt/sdcard/download/1.html");

以下是我的接收者代码：

try {
        int filesize=900000; // filesize temporary hardcoded

        long start = System.currentTimeMillis();
        int bytesRead;
        int current = 0;
        // localhost for testing
        // TODO: server's IP address. Socket should match one above in server
        Socket sock = new Socket("192.168.43.139",5005);

        Log.i("************", "Connecting...");

        // receive file
        byte [] mybytearray  = new byte [filesize];
        InputStream is = sock.getInputStream();
        // TODO: Put where you want to save the file
                /* N.B.:
                 * * To view if the file transfer was successful:
                 *       * use `./adb shell`
                 *       * use the app: File Manager
                 *
                 * * If you downloaded to '/mnt/sdcard/download',
                 *   your download might not show up in 'Downloads'
                 *
                 * * You might not have '/mnt/sdcard/download' directory
                 *   if you have never downloaded anything on your iPhone
                 */




        FileOutputStream fos = new FileOutputStream("/mnt/sdcard/download/1.html");
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        bytesRead = is.read(mybytearray,0,mybytearray.length);
        current = bytesRead;
        do {
            bytesRead =
                    is.read(mybytearray, current, (mybytearray.length-current));
            if(bytesRead >= 0) current += bytesRead;
        } while(bytesRead > -1);

        bos.write(mybytearray, 0 , current);
        bos.flush();
        long end = System.currentTimeMillis();
        Log.i("** end-start = ", String.valueOf(end-start));
        bos.close();
        sock.close();
    } catch ( UnknownHostException e ) {
        Log.i("******* :( ", "UnknownHostException");
    } catch (IOException e){
        Log.i("Read has IOException", "e: " + e);
    }

仅当我将FileOutputStream设置为1.html时，才会存储已接收的文件。否则它不会被保存。

那么我该如何让这个过程变得动态。我的意思是，我可以保存发件人发送的任何文件，而不知道其确切名称的类型？

如果我向接收者提供文件名，此代码工作正常。

供参考，我正在关注this教程或代码。

请帮忙！谢谢！

无法通过TCP连接接收名称未知的文件

0 个答案: