Question

im making a client server application in java using sockets
I’ve implemented the basic client and server, the client can send pictures to the server and the server stores them but i don’t know how to store multiple files. At the moment im using the following code to store the file received from the client

while(true)
    {
        Socket connectionSocket = serverSocket.accept();
        try (DataInputStream receivedFromClient = new DataInputStream(connectionSocket.getInputStream());
                FileOutputStream saveToServer = new FileOutputStream("files/file.jpg"))
        {    
            int i;
            while ((i = receivedFromClient.read()) > -1)
            {
                saveToServer.write(i);
            }
        }
    }

This is how im saving one file, and the file gets overwritten by any new file that the server receives. I want to store multiple files that the client sends, how would i do that? Also how would i set the names of the files that get received?

Answer 1

Add a file name argument to the method in which this code block exists that will allow you pass the filename. Or autoincrement the file name using a static counter, if that is appropriate.

The problem is you are using the same file name every time, as it is hardcoded here:

FileOutputStream saveToServer = new FileOutputStream("files/file.jpg"))

Instead, the string you are passing to FileOutputStream should be variable, ex.

FileOutputStream saveToServer = new FileOutputStream(yourStringVariable))