Syntax for calling HTTP Servlet from Flex

Question

Just trying to figure out the proper syntax for making a POST to an HTTP Servlet from Flex. A Java developer gave me this URL to call:

http://myUrl:myPort/myProject/test/getFile/?fileId=1225

I want to build the the HTTPService url dynamically, meaning I pass the '1225' at the end.

My question is regarding how to translate that to MXML. Does that mean my HTTPService object looks like this?

<mx:HTTPService
    id="rawFileServlet"
    url="http://myUrl:myPort/myProject/test/getFile/?fileId="
    method="POST"
    showBusyCursor="true">

    <mx:request xmlns="">
        <fileId>

        </fileId>
    </mx:request>

</mx:HTTPService>

And my call is this:

params["fileId"] = 1225; httpServ.send(params);

Is that right? Something seems strange about it.

Here's updated code that works but doesn't allow me to trap remote errors nicely:

var url:String = model.fileUploadServletUrl;

        var request:URLRequest = new URLRequest();
        request.method = 'POST';
        request.url = url;

        var uvar:URLVariables = new URLVariables();
        uvar.fileId = evt.fileId;

        request.data = uvar;

        try{
            navigateToURL( request );
        }
        catch( e:Error ){
            ErrorManager.processRemoteError( 'Download Excel failed' );
        }

Constantiner · Accepted Answer · 2011-06-08 17:04:18Z

3

If you form your parameters in ActionScript in send() method use the following:

<mx:HTTPService
    id="rawFileServlet"
    url="http://myUrl:myPort/myProject/test/getFile/"
    method="POST"
    showBusyCursor="true" />

And you can use simple object for params:

var params:Object = {fileId: 1225};
rawFileServlet.send(params);

answered Jun 8, 2011 at 17:04

Constantiner

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7 Comments

J_A_X Over a year ago

This is the correct way. It should also be mentioned that if the URL is different than where your swf is located, you'll need a crossdomain policy file on the web server.

fumeng Over a year ago

thank you, it worked like a charm. One addendum, this URL should prompt me to download a file. It works if I copy and paste link in browser, but launching it locally from IDE, all I get is result msg back from HTTP service call. Is there a network setting I need to change or s/thing?

Constantiner Over a year ago

You need URLLoader for that.

fumeng Over a year ago

I'm not sure about that. I'm calling a script on a Java Servlet, not pointing to a specific file to download.

Constantiner Over a year ago

If result is a file it doesn't matter. Try to use URLLoader. It accepts URLVariables as data of URLRequest.

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