Why is My Java File Transfer Over Sockets Generating an Empty File?

Java File Transfer over Sockets: Resolving Corrupted File Issue

Your Java program aims to transfer a file between a client and a server via sockets. However, the server is currently generating an empty file. To rectify this, let's inspect both the server and client code.

Server Code:

Starting with the server code, the issue stems from reading the file bytes all at once using in.read(bytes). This approach may not capture all the bytes if the file is large. Instead, we should read the bytes in a loop:

<code class="java">int count;
byte[] buffer = new byte[8192]; // or 4096, or more
while ((count = in.read(buffer)) > 0) {
    fos.write(buffer, 0, count);
}</code>

Client Code:

Next, in the client code, you are not actually writing the file bytes to the output stream out. The line out.write(bytes) should be used:

<code class="java">out.write(bytes);</code>

With these modifications, the program should correctly send and receive the file as intended.

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