message from server = null?

[kelvin cheung]

Hi.
I am trying to send some messages from the server to the client program.

Here are some my code for the server:

 
try {
        s=new ServerSocket(5000);
        System.out.println("Server: Waiting for clients");
        con = s.accept();
        
        InputStreamReader leseforbindelse=new InputStreamReader(con.getInputStream());
        BufferedReader leser=new BufferedReader(leseforbindelse);
        PrintWriter skriver=new PrintWriter(con.getOutputStream());
        
        skriver.println("Server connection established");
        
        String enLinje=leser.readLine();
        
            System.out.println("A client wrote: " + enLinje);
            try {
            FileReader file=new FileReader(enLinje);
            BufferedReader contents=new BufferedReader(file); 
            String dataFromFile=contents.readLine();
            skriver.println(dataFromFile);
            System.out.println(dataFromFile);
            }
            catch (FileNotFoundException e) {
                System.out.println(e.getMessage());
                skriver.println("Could not find the file: " + enLinje);
            }
        
        con.close(); System.out.println("Server connection closed");
        } 

Here are some of the code of the client:

try {
            Socket con = new Socket("10.0.0.2", 5000);
            
            InputStreamReader leseforbindelse=new InputStreamReader(con.getInputStream());
            BufferedReader leser=new BufferedReader(leseforbindelse);
            PrintWriter skriver=new PrintWriter(con.getOutputStream(), true);
            
           //System.out.println("Message from server: " + leser.readLine());
            skriver.println(filename);
            System.out.println("Message from server: " + leser.readLine());
        }
        catch (IOException ex) {
        }  

I get this :

Message from server: null

I have tested the contents of "dataFromFile". It's not "null".

I should also have seen this :

Server connection established

How comes??

[David Harkness]

What happens if you flush the PrintWriter before closing the Socket?

[B]skriver.flush();[/B]
con.close();
System.out.println("Server connection closed");

[kelvin cheung]

Hello.

I get this when I write flush() :

Server connection established

But I should also have got the contents of :

 
skriver.println(dataToSend); 

[David Harkness]

You only read one line from the server before exiting as the first readLine() is commented out. What happens if you uncomment that line? Even better, try putting this in your client:

...
BufferedReader leser=new BufferedReader(leseforbindelse);
PrintWriter skriver=new PrintWriter(con.getOutputStream(), true);
 
String line;
while ( (line = leser.readLine()) != null ) {
    System.out.println("Server: " + line);
}

This will print out every line sent by the server.