How to parse a web page and use same session(?) to post ?

Question

hi,
lets say there a web page requesting:
-username
-password
-sequence of letters ( assume its not an image, it is just plain text)
i can get the source of page and parse and find the sequence.
however i couldnt manage to post it. (the sequence changes)
any help would be great, thx..
        try {
            int statusCode;
            String urlAddress =  "mywebpage";
            HttpClient client = new org.apache.commons.httpclient.HttpClient();
            String key ="";
            URL url = new URL(urlAddress);
            URLConnection conn = url.openConnection();
            DataInputStream in = new DataInputStream ( conn.getInputStream (  )  ) ;
            BufferedReader d = new BufferedReader(new InputStreamReader(in));
            StringBuffer buffer = new StringBuffer();
            while(d.ready())
               buffer.append(d.readLine());
            int index = -1;
            String contents =buffer.toString();
            index = contents.indexOf("operation");
            while (index  > -1) {
                key  = key + contents.substring(index+10,index+11);
                index = contents.indexOf("operator", index+11);
            System.out.println(contents);
            System.out.println(key);
            /*GetMethod getMethod = new GetMethod(urlAddress);
            getMethod.getParams().setCookiePolicy(CookiePolicy.RFC_2109);
            statusCode = client.executeMethod(getMethod);
            if (statusCode != -1) {
                contents = getMethod.getResponseBodyAsString();
                index = -1;
                index = contents.indexOf("mp3sesler");
                while (index  > -1) {
                    key  = key + contents.substring(index+10,index+11);
                    index = contents.indexOf("operation", index+11);
                System.out.println(contents);
                System.out.println(key);
            PostMethod method = new PostMethod(urlAddress);
            // Configure the form parameters
            method.addParameter("user", "test");
            method.addParameter("pwd", key);
            // Execute the POST method
            statusCode = client.executeMethod(method);
            if (statusCode != -1) {
                contents = method.getResponseBodyAsString();
                method.releaseConnection();
                System.out.println(contents);
        } catch (Exception e) {
            e.printStackTrace();
        }

Answer 1

perhaps the website checks its source? What HTTP response do you get back?