Skip to main content

Server side HTTP Post using JSP

Ok, so I use a rapid application development technology (ColdFusion or PHP) most of the time because customers demand such quick turnaround.  This time I needed to go back to goold old Java and do some integration.

Our email list management service (Sound-Off 3) manages people's email lists and lets them schedule mailings, etc.  I needed to integrate a website build on JRun (using Java Server Pages aka jsp) so that when people register, it relays the info to Sound-Off 3.

In ColdFusion, you can easily do this with a CFHTTP tag.  In JSP it is a little more involved.  My struggle is your benefit, b/c here is the code that does it in JSP.

This code will do an HTTP POST from the WEB SERVER to the remote site, all behind the scenes on the server.  The "parameters" string contains the form values that will be sent to the remove server.  Note the leading/trailing &'s and that the form values must be URL encoded.

try

{

    String stuff = null;

    String pagecontent = "";

    String parameters = "&message=hello+world&";

    java.net.URL url = new java.net.URL(http://www.yourhost.com/page.cfm);

    java.net.HttpURLConnection conn = (java.net.HttpURLConnection)url.openConnection();

    conn.setRequestMethod("POST");

    conn.setRequestProperty("Content-Length", "" + Integer.toString(parameters.getBytes().length));

    conn.setRequestProperty("Content-Language", "en-US");

    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

    conn.setDoInput(true);

    conn.setDoOutput(true);

    conn.setUseCaches(false);

    conn.setAllowUserInteraction(true);

    java.io.DataOutputStream printout = new java.io.DataOutputStream (conn.getOutputStream ());

    printout.writeBytes (parameters);

    printout.flush ();

    printout.close ();

    java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader(conn.getInputStream()));

    while ((stuff = in.readLine()) != null)

    {

         pagecontent += stuff;

    }

    in.close();

    %>success! <%

}

catch (Exception e)

{

    %>error!<%

}

%>

And thats it!   You can (and should) do further error checking by examinging the contents of "pagecontent" which will have the html code returned from remote website.

Have fun...

Popular posts from this blog

Installing python 3.4.x on OSX El Capitan

I love "brew" package manager, but sometimes being too progressive breaks things.  I have several python apps that I maintain that get deployed to AWS using Elastic Beanstalk.  AWS eb can deploy with python 2.7 or 3.4.  Any recent 'brew install python3" will get 3.5.1. #annoying

Making Macbook Air with 128GB SSD usable with Bootcamp

I recently got a new Macbook Air 11" (the 2012 version) and loaded it with goodies like 8GB ram and 2GHz Core i7.  What I DIDN'T upgrade was the internal SSD.  My config came with 128GB SSD and I refused to pay $300+ to upgrade it to 256GB.  Yeah I know, some call me cheap, but SSds cost $75-$150 for 240GB, so adding another 128GB for $300 seemed way too steep for me.  I figured "ok, I'm going to make 128G work!"

Here is the story of how that went...

Election day plus 1: Social Media Nightmare

It is election day plus 1, and a very emotional day with no way to win for many.

Social media was a force to be reckoned with this election year.  No matter what position you take, the world is ready to pounce on you and tell you why YOU are evil, intolerant or a deplorable -- and the reason for all their woes.  This isn't a new problem, though...  All of the liberal vs conservative issues are causing rifts between otherwise civil people, and it seems to be the worst on Facebook and twitter.

If I say I am for Hillary:
i am part of the "corrupt system."

If I say I am against Hillary:
I am stupid and uneducated

If I say I am for Trump:
I am against women,
I am religiously intolerant,
I am a bigot

If I say I am against Trump:
I am against the 2nd amendment,
I don't have any idea how government works,
I am part of the problem with American society,
I am against the police

Stay with me now, this isn't meant to make people angry, but it is mean to shine some light on a social …