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Date: Sat, 02 Oct 2004 20:16:56 +0200
From: Jason Novotny <novotny@aei.mpg.de>
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To: commons-httpclient-dev@jakarta.apache.org
Subject: convert usage if URLConnection to HttpClient
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Hi,

    I had been using some crufty code using URLConnection to perform 
basic auth to retrieve the list of applications using the Tomcat manager 
webapp. I'd like to convert this to use commons-httpclient-2.0.1.

    It should be pretty simple I think-- what is required is to invoke 
http://127.0.0.1/manager?list performing basic authentication using name 
and password and then I get back a response which has a specific format.
    My current code is shown below and I'd like to know what the 3 or 5 
magic lines are to do the same thing using HttpClient.

    Thanks very much, Jason

try {
            String serverName = req.getServerName();
            int serverPort = req.getServerPort();
            URL u = new URL("http://" + serverName + ":" + serverPort + 
"/manager" + command);
            URLConnection con = u.openConnection();

            String up = USERNAME + ":" + PASSWORD;
            String encoding = null;
            // check to see if sun's Base64 encoder is available.
            try {
                sun.misc.BASE64Encoder encoder =
                        (sun.misc.BASE64Encoder)
                        
Class.forName("sun.misc.BASE64Encoder").newInstance();
                encoding = encoder.encode(up.getBytes());
            } catch (Exception ex) { // sun's base64 encoder isn't available
                throw new TomcatManagerException("No 
sun.misc.BASE64Encoder availoable in JDK!");
            }

            con.setRequestProperty("Authorization", "Basic " + encoding);
            con.setDoInput(true);
            con.setUseCaches(false);
            con.connect();

            if (con instanceof HttpURLConnection) {
                HttpURLConnection httpConnection = (HttpURLConnection) con;
                // test for 401 result (HTTP only)
                if (httpConnection.getResponseCode() == 
HttpURLConnection.HTTP_UNAUTHORIZED) {
                    throw new TomcatManagerException("HTTP Authorization 
failure!");
                }
            }

            BufferedReader reader = new BufferedReader(new 
InputStreamReader(con.getInputStream()));

            // get first line
            // should be something like:
            // OK - some information text
            String line = null;

            line = reader.readLine();
            StringTokenizer tokenizer = new StringTokenizer(line, "-");
            if (tokenizer.countTokens() == 2) {
                String rc = tokenizer.nextToken();
                String description = tokenizer.nextToken();
                result = new TomcatWebAppResult(rc, description);
            }

            while ((line = reader.readLine()) != null) {
                result.addWebAppDescriptor(line);
            }
            reader.close();

        } catch (IOException e) {
            throw new TomcatManagerException("Unable to perform command: 
", e);
        }


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