Sending files from server to client...

[Steven Wolf]

We want to transfer a file from a server socket to a client socket (a file, not a string).
We are students and work for a school-project.
We wrote the following Code, but it doesn't work properly. We work with Threads. The file exists, so this can't be the problem.

Client:

...
try {
Socket socket = new Socket("192.168.10.10", 4000);
InputStream in = socket.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
BufferedOutputStream bos = new BufferedOutputStream(baos);
byte[] buffer = new byte[10];
int c, readed = 0;
while((c = in.read(buffer, 0, 10)) != -1) {
  readed += c;
  bos.write(buffer, 0, c);
  String s = nwe String(baos.toByteArray());
}
}catch(Exception) {}
...

Server:

...
try {
ServerSocket = new ServerSocket(4000);
Socket client;
client = server.accept();
int clientPort = client.getPort();
FileInputStream in = new FileInputStream("C:\\test.exe");
FileOuputStream out = (FileOuputStream) client.getOutputStream();
byte[] buffer = new byte[10];
int c;
while((c = in.read(buffer)) != -1) {
  out.write(buffer, 0, c);
}
}
catch(Exception) {}
...

Thank You
Steven & Adrian
[ June 17, 2003: Message edited by: Steven Wolf ]

[Michael Morris]

Hi Steven,
Welcome to JavaRanch. What exactly do you want to do here? Do you want to create a copy of the file sent from the server onto the client machine? All it appears that you are doing now is creating a String (you need to change nwe to new) that grows by ten bytes on each read and then doing nothing with the String.

[Steven Wolf]

Hi Michael
What we want to do is: The client should be able to find a specific file on the server and download a copy of it.
The nwe was a misstake

[Michael Morris]

Originally posted by Steven Wolf:
Hi Michael
What we want to do is: The client should be able to find a specific file on the server and download a copy of it.
The nwe was a misstake

In that case, you will need to open both input and output streams on both ends of the socket for communication. It is usually best for the server to start the conversation and it is genereally best to get the server up and running before starting the client code. You can test the server using telnet. The basic scenario would be:

Client connects to Server

Server sends greeting banner to Client

Client acknowledges greeting and sends request for file

Sever receives Client request and tries to locate file

Server sends status of request to Client (file found or not)

Client acknowledges status receipt and if file was found sends ready for transfer notice to Server

Server sends the file and closes the connection

Client receives the file and stores it locally