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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.

The configuration in Listing 8-2 is ideal for web applications that require only one database. For anything other than a demo application, you should certainly use a full RDBMS. However, the DataSource and transaction-management configurations are perfectly suitable for small to medium-sized applications. You may need to tweak DataSource configurations for the pool of database connections as usage grows, however. Another alternative is to use a JNDI DataSource. As your needs grow, you might find it necessary to change the implementations of either the DataSource or the transaction manager. For example, your application server might provide DataSources that have greater failover capabilities. Doing so should not affect the initial

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5. If you wish to work with the finer features of the Location module, create a table called zipcodes using the file supported/zipcodes.mysql. Then, depending on which data dumps are available, import zip code data into this table. The supported/zipcodes.us.mysql file, for example, provides the data dump for the United States. If you intend to run multiple location-enabled sites on the same database server, you might consider putting the zipcodes table in a separate database and sharing it among all the sites. Since it is used only for looking up zip code information and is never written to, this is a safe and efficient approach. See 6 for details on running multiple sites and database table prefixing. 6. Navigate to administer modules (admin/modules) and enable the module. As with the Event module, your next steps are to configure the module and make some nodes location-enabled.

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.

Select administer settings location (admin/settings/location) to see the configuration settings for the Location module.

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.

assumptions you ve made, as Spring hides those implementation details very well behind interfaces. The benefits of this configuration are that you can scale your solution by changing only bean implementations. The wiring and configuration remain the same. We ve kept any web-related beans out of the global ApplicationContext. Let s now look at how to build a web application on top of the main MembershipService, which integrates the web application with the data-access layer.

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