Data Transfer Using Sockets. Java & Firefox Extension

I am trying to implement a data transfer between programs in Java (Client) and Firefox extension in JavaScript (Server). I can't send and receive using one socket only. Help me to

Solution 1:

Your problem may be related to the fact that you are not flushing the output stream in your client code:

PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
out.write(messageToServer);

while the PrintWriter has been created with autoflush=true, the autoflush only comes into effect if you are using the println, printf or format method (as per javadocs), so I'd change your code to:

PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
out.println(messageToServer);

or

PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
out.write(messageToServer);
out.flush();

EDIT:

While I've got no experience with the Firefox library, I also wonder whether the Javascript code that is reading the input is incomplete and I wonder whether you could try the following (which should read the input in 512-byte chunks):

var request = '';
while (sin.available()) {
    request = request + sin.read(512);
}

In addition, when reading your response in the Java client I would:

String line;
while ((line = reader.readLine()) != null) {
    System.out.println(line);
}

Solution 2:

Need to close the out in Java.

out.close();