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Visual Studio will then create a special type of class called a proxy. This is simply a local representation of the remote service, allowing you to call methods as if they were implemented on your local computer. However, under the covers, ASP.NET will forward all of the proxy method calls to the remote service for execution. If Visual Studio interprets the file successfully, you will see a list of available methods (GetStockQuotes in the example in Figure 2-14). You can then create a name for the web reference and add the reference to your project. At this point in your project, you can create an instance of the web reference proxy class and call the method on it to get data back from the web service. In fact, let s do that now so that we can call a remote web service to obtain stock quotes for our example. Right-click the project name and select Add Web Reference. When the Add Web Reference dialog box appears, type http://services.xmethods.net/ soap/urn:xmethods-delayed-quotes.wsdl into the URL field and click Go. We ll be using a service provided by XMethods (www.xmethods.com) that reports delayed stock quotes given a stock ticker symbol. You can see this in Figure 2-14. After clicking Go, Visual Studio contacts XMethods, downloads the WSDL, and displays the available methods it finds for you to review. Note the value in the Web reference name field (net.xmethods.services), which will ultimately form the namespace of the proxy class you ll be using. Change the value you find there to QS for quote service, and then click Add Reference. At this point,

If your portlet needs to run in an SSL connection, use the secure attribute to force the portlet to use the HTTPS protocol if available. The portlet can also be told to use a normal, insecure connection by setting the secure attribute to false. The secure attribute is optional, and takes either true or false as possible values. If there

ajaxRequest.onreadystatechange=DisplayPic; ajaxRequest.send(); }

XSD schemas represent the most recent effort to provide standardization for defining XML structures. The XSD schema specification is a W3C recommendation. One of the key benefits of XSD schemas is that they support data types. They are XML documents themselves and overcome most of the limitations of DTDs. If you are building new schemas for your XML documents, you should create them by using XSD instead of the DTD or XDR standards.

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is no secure attribute on the <actionURL> or <renderURL> tag, the portlet must maintain its current connection (HTTP or HTTPS). If the portlet doesn t support HTTPS or another secure protocol, a JSP exception will be thrown. This could be a problem if the portlet is used with non-HTTP protocols, or with clients that support a very limited network stack (no SSL). If we needed to secure confidential information from network snooping, we could use the secure attribute here in the <actionURL> tag:

This is a simple Ajax function, constructing a URL to the GetPicture service using the value that was passed into it. It performs an HTTP-GET to that URL, and specifies DisplayPic as the callback function for state changes. The DisplayPic function then checks for readyState being 4 (i.e., download complete), and loads the <div> with an <img> tag pointing to the same URL. As the image has already been downloaded, it will be instantly pulled from the cache. Note that the browser looks at the URI of a resource and determines if the current version is cached. If it is, it loads it from the cache; if it isn t, it downloads it.

Now that you know the possible ways to define XML structure, let s put each of the ways to use. In this section, you will create a formal structure for the same Employees.xml document by using the DTD and XSD standards. Because XDR and XSD are closely matching standards, and XSD supersedes XDR, I will not cover XDR here.

<portlet:actionURL secure="true"> <portlet:param name="mvcAction" value="viewBillingAccountInfo"/> </portlet:actionURL>

function DisplayPic() { var divPic = document.getElementById("pic"); if(ajaxRequest.readyState == 4) { divPic.innerHTML = "<img alt='not present' src='" + theURL + "' />"; } GetPic(currentPic+1); GetPic(currentPic+2); GetPic(currentPic-1); GetPic(currentPic-2); }

You can create a URL for a portlet render request with the <renderURL> tag. This tag is very similar to the <actionURL> tag, except that it creates a render request for the current portlet instead of an action request. It uses the same portlet attributes as the <actionURL> tag, and is used in a similar manner. Here is an example that uses a render request to display an e-mail in the portlet:

You already know how our Employees.xml file looks. Our aim is to define the structure of the document by using the DTD and XSD standards so that you can validate the document later. The structure of Employees.xml is as follows:

<portlet:renderURL> <portlet:param name="emailID" value="689"/> <portlet:param name="mvcAction" value="viewEmail"/> </portlet:renderURL>