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You can use any MIME type passed into the third sendTempFile() method listed previously. It is convenient to use the DisplayChart servlet class that comes with JFreeChart to serve your images if possible.

JFreeChart supplies a helper servlet class named DisplayChart to serve chart images to the user. The portlet application s web.xml deployment descriptor must contain the DisplayChart servlet definition.

This XML document represents a list of employees. The <employees> element forms the document element and contains three <employee> child elements. The <employee> element has an attribute called employeeid and four subelements: <firstname>, <lastname>, <homephone>, and <notes>. The <notes> element contains descriptive data that is stored as CDATA. To create an XML file, you can enlist the help of the Visual Studio IDE, which enables you to quickly create XML documents by auto-completing end tags, putting attributes in quotes, and showing errors related to the document not being well formed. Because we will be using this file often, I recommend that you create it and keep it in a handy location on your hard disk.

if (String.IsNullOrEmpty(Request.Params["test1"])){ strTest1 = Request.Params["test1"]; } else { strTest = String.Empty; }

<servlet> <servlet-name>DisplayChart</servlet-name> <servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> </servlet> <servlet-mapping> <servlet-name>DisplayChart</servlet-name> <url-pattern>/servlet/DisplayChart</url-pattern> </servlet-mapping>

You should always check to see if the parameter is present (non-null entry in the array) before you load it into an internal data store, such as strTest1 in the preceding case. You should also sanitize all input parameters after loading them to avoid security holes through events such as SQL injections. The Request object supports much more than managing the parameters, including cookies and certificates. See http://msdn2.microsoft.com/en-us/library/system.web. httprequest(vs.80).aspx for more information.

To open an existing XML document, you need to use the XmlDocument class. The XmlDocument class allows you to open XML documents in three common ways: You can specify the path to, or URL of, the XML file. You can use a stream object such as FileStream that contains the XML data. You can hold a string in memory that contains the XML data. To see how each of the preceding approaches can be used, you need to develop a Windows application like the one shown in Figure 2-2.

The DisplayChart servlet expects to find the filename of the chart image in the filename request parameter. The portlet has to provide this parameter, or the DisplayChart servlet will throw an exception. The display servlet looks in the Java temporary directory for an image with that filename. The java.io.tmpdir system property defines the temporary directory, which you may need to configure in your portal or application server if you do not want the default. If the user is permitted to view the chart, the DisplayChart servlet puts the binary chart data into the servlet response using the sendTempFile() method on the ServletUtilities class.

NOTE In the current version of Pluto as of this writing, servlets running outside the portal but inside the same servlet container do not share a session with the portlets in the same portlet application, when we run on Tomcat (5.0.25). The DisplayChart servlet looks in its HttpSession for a ChartDeleter object, so it can determine whether to serve the chart to the user. To use these classes in our portlet application, we had to remove the DisplayChart servlet s dependency on the HttpSession. Unfortunately, this means that we also removed the servlet s security features. Other portals or future releases of Pluto may not have the same problem, and you will be able to use the DisplayChart class as-is. We commented out the security checks in the DisplayChart class s service() method. You can find the modified version of DisplayChart on our web site, www.portalbook.com.

As you can imagine, if you can handle requests, you can also handle responses. This is done using the Response object, which can be used to write new output to the response buffer or to redirect the user to another page or site.