Java socket programming header

Question

Hi,

I am trying to send a file through a java socket and receive it through another. However, this happens:

Send Content:

/* This is simply a file to transfer */

Received:

so basically I cannot escape the received content on stack overflow. It is basically a bunch of unreadable bytes (about 32 bytes worth) and then the message I sent.

OutputStream os = sock.getOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(os);
oos.writeObject(mybytearray);
oos.flush();
oos.close();

And for the client:

BufferedReader in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
FileOutputStream fos = new FileOutputStream("newfile.java");
BufferedOutputStream bos = new BufferedOutputStream(fos);
bytesRead = is.read(mybytearray,0,mybytearray.length);
current = bytesRead;
bos.write(mybytearray, 0 , current);
bos.flush();
bos.close();
sock.close();

Answer 1

It would help to see the code, but what you've got there looks like basic random data. Some things to check:

1. What type is the receive buffer?
2. How many characters do you seem to be sending and receiving?
3. Are you sure your print statement on the receive end is pointing at the right place?

Answer 2

Why go through ObjectOutputStream? Either use the OutputStream directly through the write method, or choose for instance DataOutputStream if you find it neccessary.

Besides, you should not use the Reader classes for transferring binary data. From the api of Reader:

Abstract class for reading character streams.

---

A complete "send file over socket" example can be found here:

Transfer a file via Socket.

Key server-side code:

  OutputStream os = sock.getOutputStream();
  System.out.println("Sending...");
  os.write(mybytearray,0,mybytearray.length);
  os.flush();
  sock.close();

Key client-side code:

bytesRead = is.read(mybytearray,0,mybytearray.length);

Answer 3

This doesn't make any sense. If you use an ObjectOutputStream you have to use an ObjectInputStream to read it. If you want to use a Reader to read it you have to use a Writer to write it.