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Figure 2-2. Opening an XML document The application consists of three radio buttons for selecting the place from where the XML document is to be loaded. There is a text box for entering the file path, URL, or XML string. Finally, there is a button titled Open Document that opens the XML file depending on the selection and shows a message box with a success message.

One nice feature of the DisplayChart servlet is that it strips any .. directory references from the filename parameter, so you can prevent unauthorized access to files outside the temporary directory. In addition to this basic security, the display servlet checks the image to see if this user is allowed to access the chart, or if the chart is available to any user. This prevents users from viewing another user s chart by changing the filename parameter on the URL. If you use this servlet to display your charts, you will need to use the ChartDeleter class inside your portlet to manage the charts in the temporary directory. If the DisplayChart servlet meets your security needs, you can use it as-is. The source code for the servlet comes with JFreeChart, so it should be easy to make any necessary modifications.

So, for example, to write new content to the output buffer, you d simply call its Write method, like this:

The ChartDeleter class serves two purposes: disk space management and security for the DisplayChart servlet. Your portlet application should clean up the temporary chart image files that it creates. These can easily fill your hard drive, and you will need to come up with a strategy that minimizes disk space demands but that also does not erase an image that might be served to a user right now. One approach

Note I have not included any input validation code in the examples so as to keep the examples focused

14

Response.Write("New Content");

As you can see, this XML document uses the <MenuItem> element to represent a TreeView node. The Title and URL attributes represent the Text and NavigateUrlField properties of individual TreeView nodes. Now suppose that for some reason you want to bind the same TreeView to another XML document, as shown in Listing 11-13. Listing 11-13. XML Markup from the New XML File < xml version="1.0" encoding="utf-8" > <node text="Home" url="default.aspx"> <node text="Products" url="products.aspx"> <node text="Product 1" url="product1.aspx"></node> <node text="Product 2" url="product2.aspx"></node> <node text="Product 3" url="product3.aspx"></node> </node> <node text="Services" url="services.aspx"> <node text="Service 1" url="service1.aspx"></node> <node text="Service 2" url="service2.aspx"></node> <node text="Service 3" url="service3.aspx"></node> </node> <node text="About Us" url="about.aspx"></node> <node text="Contact Us" url="contact.aspx"></node> </node> You might have noticed that this is the same XML file that we used in the previous example. To cater to the change, you need to reconfigure the TreeView node data bindings to suit the new XML document. If the underlying data binding has complex nesting, this may not be an easy task. This situation can be avoided if you apply an XSLT style sheet to the XML from Listing 11-13 and transform it to match the XML in Listing 11-12. The XSLT style sheet that can do this transformation is shown in Listing 11-14. Listing 11-14. An XSLT Style Sheet for Transforming the New XML Markup < xml version="1.0" encoding="UTF-8" > <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="/"> <xsl:for-each select="."> <xsl:apply-templates/> </xsl:for-each> </xsl:template> <xsl:template match="node"> <xsl:element name="MenuItem"> <xsl:attribute name="Title"> <xsl:value-of select="@text"/> </xsl:attribute>

is to create a scheduled thread that deletes any chart images in the temporary directory over 24 hours old. A better approach is to ensure that any charts created for the user be available as long as the user has a valid session. The ChartDeleter class implements the HttpSessionBindingListener interface. Any attributes in the portlet session are also attributes in an HTTP session, so the standard servlet session binding listeners will work. The portlet that is responsible for charting should add an instance of the ChartDeleter object to the user s session if one does not already exist. When the portlet serves a content fragment that includes one or more charts embedded as <IMG> HTML tags, the portlet should register the chart s filename with the user s ChartDeleter using the addChart() method:

Or, to redirect the user to a new page, you can use this:

public void addChart(String filename)