java - 如何将文件之前的字节数组读入OutputStream

Question

我想将文件大小和另一个整数(即 Android 平板电脑的平板电脑序列号)发送到运行 Windows 7 的服务器:

我的客户端代码有什么问题以及如何使服务器接受不同的字节流数据？

android平板客户端代码

   try {

                byte[] bytes = new byte[(int) length];
                fis = new FileInputStream(file2);
                bis = new BufferedInputStream(fis);
                bos = new BufferedOutputStream(socket.getOutputStream());

                int count;

                // convert integer to byte
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                DataOutputStream dos = new DataOutputStream(baos);
                dos.writeInt(1992);
                byte[] preByte = baos.toByteArray();

                // the first byte that sends the tablet serial number and the size of the next file it is going to send
                bis.read(preByte);

                // the next sent is the file itself which is a database file
                while ((count = bis.read(bytes)) > 0) {
                    bos.write(bytes, 0, count);
                }

                fis.close();
                bis.close();
                fis = null;
                bis = null;
                socket.close();

将接收两个文件的服务器代码

        fos = new FileOutputStream(file);
        bos = new BufferedOutputStream(fos);

        System.out.println("streams are setup from new thread\n");

        is = socket.getInputStream();
        bufferSize = socket.getReceiveBufferSize();

        buffer = new byte[bufferSize];

        while ((count = is.read(buffer)) > 0) {
            bos.write(buffer, 0, count);
        } // end while

        bos.flush();
        bos.close();
        is.close();

Answer 1

试试这个

dos = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
dos.writeLong(length);
dos.writeInt(1992);
for (int b; (b = bis.read()) != -1;) {
   dos.write(b);
}

...

dis = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
long length = dis.readLong();
int serialNumber = dis.readInt();
... read bytes