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Let s begin with a scenario that is very common with modern web applications. A servlet calls out to a session bean to execute a query and receives a collection of entities in return. The servlet then places these entities into the request map and forwards the request to a JSP for presentation. This pattern is called Page Controller,1 a variation of the Front Controller 2 pattern in which there is a single controller for each view instead of one central controller for all views. In the context of the familiar Model-View-Controller (MVC) architecture, the session bean provides the model, the JSP page is the view, and the servlet is the controller.

Fowler, Martin. Patterns of Enterprise Application Architecture. Boston: Addison-Wesley, 2002.

Summary

The Geocoding service if freely available, but it does have some limitations, since it s a fairly processor-intensive request. It s currently limited to 2,500 geocode requests every 24 hours from a single IP address. That s not an insignificant amount of requests, so in most cases, this will more than suffice. It s not the end of the world if you exceed that limit once or twice, but repeated abuse can result in a permanent ban.

Alur, Deepak, John Crupi, and Dan Malks. Core J2EE Patterns: Best Practices and Design Strategies, Second Edition. Upper Saddle River, N.J.: Prentice Hall PTR, 2003.

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In this chapter, you learned how to build applications with Ant and J2ME Polish. You can equip your applications with specific resources without touching the source code, use obfuscators to minimize the application size, localize your application, and integrate a third-party API. In the next chapter, you will explore the possibilities of preprocessing. In contrast to the packaging solutions, preprocessing is used on the source code level of your application.

First consider the session bean that will produce the results that will be rendered by the JSP page. Listing 6-23 shows the bean implementation. In this example, we are looking at only the findAll() method, which returns all the Employee instances stored in the database. Listing 6-23. The EmployeeService Session Bean @Stateless public class EmployeeServiceBean implements EmployeeService { @PersistenceContext(unitName="EmployeeService") private EntityManager em; public List findAll() { return em.createQuery("SELECT e FROM Employee e") .getResultList(); } } // ...

Note The Geocoding service integrated in the Google Maps API is meant for dynamically geocoding addresses from user input. If you instead have a static list of addresses that you want to look up, you should use the Geocoding web service, which is better suited for that particular task. You can find it at http://code.google.com/apis/maps/documentation/geocoding/index.html.

Listing 6-24 shows the source code for a simple servlet that invokes the findAll() method of the EmployeeService session bean to fetch all the Employee entities in the database. It then places the results in the request map and delegates to the listEmployees.jsp JSP page to render the result. Listing 6-24. The View Employees Servlet public class EmployeeServlet extends HttpServlet { @EJB EmployeeService bean; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { List emps = bean.findAll(); request.setAttribute("employees", emps); getServletContext().getRequestDispatcher("/listEmployees.jsp") .forward(request, response); }

n this chapter: Learn why J2ME Polish uses preprocessing for its J2ME APIs. Control preprocessing with directives. Use the standard preprocessing variables supported by J2ME Polish. Define your own variables and symbols in J2ME Polish. Transform variable values using property functions. Explore some practical applications of preprocessing.

Finally, Listing 6-25 shows the last part of our MVC architecture, the JSP page to render the results. It uses the JavaServer Pages Standard Tag Library (JSTL) to iterate over the collection of Employee instances and display the name of each employee as well as the name of the department to which that employee is assigned. The employees variable accessed by the <c:forEach/> tag is the List of Employee instances that was placed in the request map by the servlet. Listing 6-25. JSP Page to Display Employee Information <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <html> <head> <title>All Employees</title> </head> <body> <table>

All the functionality for doing geocoding lookups is found in the Geocoder object. It doesn t take any arguments upon initialization and has only one method: gecode(). This makes it one of the smallest objects in the Google Maps API. To initialize the Geocoder object, simply call its constructor: var geocoder = new google.maps.Geocoder();

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