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As explained earlier in this chapter, IIS hands off requests for ASP pages to the ASP ISAPI extension and sends requests for ASP.NET pages to the ASP .NET ISAPI extension. Furthermore, you have seen that IIS decides the designated ISAPI extension based on the filename extension of the requested URL. Actually, you can configure these file mappings on a per virtual directory basis. When ASP .NET is installed, it modifies the IIS metabase to add the mappings for file types that it needs to

process. To view these file mappings, click the Configuration button on the Virtual Directory tab. You ll see the window shown in Figure 18-12.

To manage the security of all your application with groups, roles, and permissions, for example, you only have to inject some classes into the Spring security framework Spring supports all major data access technologies such as JDBC, Hibernate, JPA, and Ibatis For example, to query a database you don t have to create the code to manage the connection, process the result set, and release the connection itself All these processes are handled by Spring The typical architecture of a Spring application comprises a presentation layer that uses a service layer to communicate to the data access layer, which can deal with database, mail servers, or any other data containers, as shown in Figure 1-1..

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Figure 18-12. File mappings Table 18-3 lists the ASP.NET file mappings. Table 18-3. The ASP .NET File Mappings

You ll probably notice that we are using a new object that we haven t defined, serviceConnection. This we ll take care of in a moment. We also need to finish off the onClick method. Since our new Button has its onClickListener set to be the activity, we should handle that case as well and close out the onClick method.

These are ASP.NET web pages. These are ASP.NET user controls. User controls are similar to web pages, except that they can t be accessed directly. Instead, they must be hosted inside an ASP.NET web page. These are ASP.NET web services, which allow you to expose useful functionality to other applications over HTTP. This extension is used for the global application file, which you can use to react to global events, such as when a web application first starts. This extension is used for HTTP handlers, which allow you to process requests without using the full-fledged ASP.NET web-page model. This extension is used for the trace.axd application extension, which allows you to view trace messages while debugging. These extensions identify that IIS is hosting an object that can be called by .NET remoting. The remoting technology is similar to web services, but it s a proprietary .NET solution that doesn t have the same features for cross-platform capability. These file types are used by ASP.NET, but they can t be directly requested by clients. However, ASP .NET registers them so that it can explicitly prevent users from accessing these files, regardless of the IIS security settings.

Is there any reason you should explicitly change an ASP.NET file mapping Probably not. If you have multiple versions of ASP.NET installed at one time, you may want to configure the mappings differently in different directories. That way, each website can use the version of ASP .NET that it was compiled with. However, there s no reason to make this sort of change by hand. Instead, you can use the aspnet_regiis.exe command-line utility. In other cases, you might want to add a file mapping. For example, you could specify that the ASP .NET service will handle any requests for GIF images by adding a mapping for the .gif file type that points to the aspnet_isapi.dll file. This would allow you to use ASP.NET security services for GIF file requests. (Note that this sort of change can slow down performance for GIF requests, because these requests will need to trickle through more layers on the server.)

else if (v == haveFunButton) { baService.haveFun(); } }

You should never remove any of the ASP.NET file type mappings! If you remove the .aspx or .asmx file types, web pages and web services won t work. Instead of being processed by the ASP.NET service, the raw file will be sent directly to the browser. If you remove other files types such as .vb or .config, you ll compromise security. ASP.NET will no longer process requests for these types of files, which means that malicious users will be able to request them through IIS and inspect the code and configuration information for your web application.

The Spring architecture is divided into different modules, organized with the upper modules dependent on the lower modules, as shown in Figure 4-1. Table 4-1 describes the most important of these modules.

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