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Middleware, such as the J2EE products discussed in this book, exists to overcome the differences between different computing platforms. It exposes a common set of services across platforms and provides a homogeneous computing environment in which distributed applications can be built. Software that relies solely on its middleware environment can be deployed on any platform to which the middleware has been ported. And since distributed systems must grow incrementally over a period of time in different financial, political, and business environments, the ability to run on a wide variety of platforms is crucial to the longevity of most systems. Middleware is an essential ingredient in distributed systems development. One of the most powerful aspects of J2EE is the broad range of middleware services it provides to developers. The set of service APIs that are currently a part of the J2EE specification is summarized in table 1.2. As you see, J2EE provides built-in support for publishing and locating resources, asynchronous messaging, transactions, and a host of other services. If you have worked with J2EE in the past, you are probably familiar with many of these. One API that is of particular interest to us in this book is JAXP, which we discuss in detail in the next chapter. You will also see XML as middleware for your data throughout the remaining chapters.

<input type="submit name="buttonPost id="buttonPost value="Click" onclick="javascript:WebForm_DoPostBackWithOptions( new WebForm_PostBackOptions("buttonPost", "", false, "", "target.aspx", false, false)) />

This means that we are only interested in <Provider> elements that have an attribute named Name with a value of Microsoft-Windows-Security-Auditing. This is the standard

Part I:

As a result, when the user clicks the button, the current form posts its content to the specified target page. What about the view state When the page contains a control that does cross-page posting, a new hidden field is created __PREVIOUSPAGE. The field contains the view state information to be used to serve the request. This view state information is transparently used in lieu of the original view state of the page being posted to. You use the PreviousPage property to reference the posting page and all of its controls. Here s a sample page that can access the content of the text box defined in the server form presented a moment ago:

public SimpleJavaBean(String name) { setName(name); } // accessor public String getName() { return name; } // modifier public void setName(String name) { this.name = name; } }

name of the auditing event provider in Windows. Pay very close attention, notice the right bracket (]) after the @Name clause. The next part of the query is an and . This means that we are done with the <Provider> element. The next part of the query tells us to match the <Task> child element of the <System> element. (Remember we finished with <Provider>.):

<%@ page language="C# %> <script runat="server"> void Page_Load(object sender, EventArgs e) { if (PreviousPage == null) { Response.Write( Invoke me only through cross-page posting. ); Response.End(); return; } // Retrieves the data textbox TextBox txt = (TextBox) PreviousPage.FindControl( Data ); Response.Write( <b>You passed:</b> + txt.Text); } </script> <html> <head runat="server"> <title>Target page</title> </head> <body> </body> </html>

and Task=12544]

If you have ever played with ASP.NET mobile controls, you should know about pagination. Pagination is a mobile page s ability to automatically display the contents of a form in pages according to the characteristics of the target device. The individual page to display is composed by dividing the overall markup into blocks of approximately the same size. ASP.NET 2.0 comes with a new control named Pager that adds similar functionality to all server controls, including mobile controls. The pager is capable of paginating container controls based on their weight or the number of items to display per page. The Pager control also displays its own user interface to let you move around the pages. Figure 1-9 shows a page with 50 text boxes that a pager displays a few at a time.

As you can see, this bean implements the JavaBeans contract of providing an accessor and modifier for its single property. We can save this bean to an XML file named simple.xml using the following code snippet:

It only matches Task elements with value 12544. Also note that we are matching the element value, not an attribute. Finally the bracket tells us that we are done with the <System> element we have to keep track of which bracket refers to which element. The next clause is a little more complex, but get used to it this is how you get to information in the Data section of events.

and EventData[

6

This tells us that we want to match the <EventData> child element of the <Event>. The next bit actually does almost all the work:

import java.beans.XMLEncoder; import java.io.*; ... XMLEncoder e = new XMLEncoder(new BufferedOutputStream( new FileOutputStream("simple.xml"))); e.writeObject(new SimpleJavaBean("Simpleton")); e.close();