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WE ARE READY TO START developing our first portlet applications This chapter contains a quick primer on portlet development, packaging, and deployment descriptors The open source Apache Pluto portal supports the portlet API, and you will learn how to deploy and run portlets on Pluto We also cover the programming concepts we use in these first simple portlets, to get you up to speed on developing solutions with portals If you are familiar with servlet development, the details of portlet development will be pretty easy The authors of the portlet specification purposely made portlets similar to servlets so that developers would not have to stretch too far to learn the new API The hard part of portlet development is design and architecture for the portal and its portlets instead of working on one Java 2 Enterprise Edition (J2EE) application, multiple applications need to be integrated into a portal.

Figure 11-36. Design of Default.aspx Default.aspx contains two hyperlink controls titled Go to Admin Folder and Go to Nonexistent File, respectively. Set the NavigateUrl property of these hyperlink controls to ~/admin/default.aspx and ~/notexists.aspx, respectively. Note that we are deliberately setting NavigateUrl of the second hyperlink to a nonexistent file. Now drag and drop a LinkButton control and set its Text property to Throw Exception. Add the code shown in Listing 11-29 in its Click event handler. Listing 11-29. Throwing an Exception protected void LinkButton1_Click(object sender, EventArgs e) { throw new Exception("Unexpected Error"); }

sqlComm.Parameters.Add("@strZIP", strParamZIP);

For developers who are not familiar with JavaServer Pages (JSP), we recommend Beginning JSP 2: From Novice to Professional (Apress, May 2004) We use JSP and JSP tags for our portlet applications, so some experience with those is useful If you have not used the servlet API, you do not need to know it to do portlet development, or to understand our examples The portlets in this chapter will be portable to any JSR 168 compliant portal server Portlet deployment is going to vary based on your portal vendor s provided tools some may pick up portlet applications from a directory, others may need a command-line tool, and some may use a web-based GUI to allow remote deployment and administration In any case, the concepts used for development are the same We are going to use the terms portlet, portlet application, portlet container, and portal in this chapter.

The code simply throws a new exception Because this is an unhandled exception, we will get a chance to trap it by using a custom error page Now add a Label and a HyperLink control each on FileNotFoundaspx, UnAuthorizedaspx, and GlobalErrorPageaspx Set the Text property of the Label controls to a friendly error message Point the HyperLink to Defaultaspx so that users can easily navigate back to the home page Add the code shown in Listing 11-30 in the Page_Load event of the Admin/Defaultaspx web form Listing 11-30 Throwing an HttpException protected void Page_Load(object sender, EventArgs e) { throw new HttpException(403, "Unauthorized"); } The code raises an HttpException with a status code of 403 and a string message The HttpException class represents an HTTP-specific exception This way, we trigger an exception with status code 403 (unauthorized access) Now open web.

Portlets are individual classes that process requests from a user and return content for display inside a portal Portlet applications are standard J2EE web applications that include portlet classes and the portletxml portlet deployment descriptor The portlet container is part of a portal, and it instantiates and executes the portlet classes Portals aggregate the output of one or more portals into a portal page, which is served to a user When the user selects a link or submits a form on the portal page, the portal processes the request and then sends requests to all of the portlets on the page We explain more about portlet request handling in this chapter, so don t worry if this seems a little confusing now..

The value you ll assign to the parameterized postal code is contained in the variable strParamZIP. The value can be the result of text input, or, if you prefer, taken directly off the query string. The code to access it from the query string will look like this:

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