How can I store the results I received from the server to a textfile

Can anybody help me with this here.  I am working on a network application where I have to create a socket connection to the IP address and port that they already given me and then send XML message to the socket and finally include the ReadMe.txt file where I will save what I have received from the server
<pre>Send the following XML message to the socket, Please note there is no security, no certificates, just a plan TCP/IP connection. The
request message is formatted below. Please include a README.txt file where you saved what you have received from the server.
Without this file, your assignment will not be evaluated.
<request>
<EventType>Authentication</EventType>
<event>
<UserPin>12345</UserPin>
<DeviceId>12345</DeviceId>
<DeviceSer>ABCDE</DeviceSer>
<DeviceVer>ABCDE</DeviceVer>
<TransType>Users</TransType>
</event>
</request>

private static Socket socket;

public static void main(String args[])
{
    try
    {
        socket = new Socket( "196.37.22.179", 9011);

        //Send the message to the server
        //PrintStream outstrm = null;
        OutputStream os = socket.getOutputStream();
        OutputStreamWriter osw = new OutputStreamWriter(os);
        BufferedWriter bw = new BufferedWriter(osw);

        String str;
        str = "<request>";
        str += "<EventType>Authentication</EventType>";
        str += "<event>";
        str += "<UserPin>12345</UserPin>";
        str += "<DeviceId>12345</DeviceId>";
        str += "<DeviceSer>ABCDE</DeviceSer>";
        str += "<DeviceVer>ABCDE</DeviceVer>";
        str += "<TransType>Users</TransType>";
        str += "</event></request>";
        bw.write(str);
        bw.flush();
        System.out.println("Message sent to the server......! ");

        //Get the return message from the server
        InputStream is = socket.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);        
    }
    catch (Exception exception)
    {
        exception.printStackTrace();
    }
    finally
    {
        //Closing the socket
        try
        {
            socket.close();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}