无法打开从套接字接收到的文件 android java

Question

我正在制作一个带有套接字的应用程序，我想在其中共享来自同一 wifi 中的两个设备的数据。使用我的代码，我可以在两个设备之间成功共享文件的确切大小，并以特定名称保存到设备存储中，但是当我尝试打开它时，它无法在文件管理器中打开。我已经用 mp4 文件和 apk 文件试过了

这是发件人的代码

        @Override
        public void run() {
            //File file = new File(src);
            File file = new File(Environment.getExternalStorageDirectory() + "/c.mp4");

            byte[] bytes = new byte[(int) file.length()];
       
            BufferedInputStream bis;
            try {
                bis = new BufferedInputStream(new FileInputStream(file));
                DataInputStream dis = new DataInputStream(bis);
                OutputStream os = socket.getOutputStream();
                DataOutputStream dos = new DataOutputStream(os);
                dos.writeUTF("anything");
                dos.writeLong(bytes.length);
                int read;
                while ((read = dis.read(bytes)) != -1){
                    dos.write(bytes,0,read);
                }


                //os.write(bytes, 0, bytes.length);  //commented
                //os.flush();   //commented
                socket.close();

                final String sentMsg = "File sent to: " + socket.getInetAddress();
                MainActivity.this.runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        Toast.makeText(MainActivity.this, sentMsg, Toast.LENGTH_LONG).show();
                    }});

            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally {
                try {
                    socket.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

这是接收器



        @Override
        public void run() {
            Socket socket = null;
            int bytesRead;
            InputStream in; //changed
            int bufferSize=0;

            try {
                socket = new Socket(dstAddress, dstPort);

                bufferSize = socket.getReceiveBufferSize();
                in = socket.getInputStream();
                DataInputStream clientData = new DataInputStream(in);
                File file = new File(Environment.getExternalStorageDirectory(), "c.mp4");
                OutputStream output = new FileOutputStream(file);
                byte[] buffer = new byte[bufferSize];
                int read;
                while ((read = clientData.read(buffer)) != -1){
                    output.write(buffer, 0 , read);
                }


                //bos.close();  //commented
                socket.close();

                MainActivity2.this.runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        Toast.makeText(MainActivity2.this, "Finished", Toast.LENGTH_LONG).show();
                    }});

            } catch (IOException e) {

                e.printStackTrace();

                final String eMsg = "Something wrong: " + e.getMessage();
                MainActivity2.this.runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        Toast.makeText(MainActivity2.this,
                                eMsg,
                                Toast.LENGTH_LONG).show();
                    }});

            } finally {
                if(socket != null){
                    try {
                        socket.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }

Answer 1

您需要像写入套接字输出流一样读取客户端数据（DataInputStream）。

uft-8 字符串，长期价值，序号字节数

您的 mp4 文件内容将以“任何内容”和长度为前缀。所以它将被视为损坏的文件。

不保存文件（“任何”和长度）

无法打开从套接字接收到的文件 android java

Can't open file received from socket android java

java

sockets

android

file-transfer