Create a login and registration system in Apache Geronimo, part 2nd: Building a registration system with JSP

Brief introduction

In the 1th part, a fictitious web Apps company created a Web site for customers that allows different levels of user authentication. Infrastructure development is done by creating database tables and security deployment plans for the application. In Geronimo's built-in Derby database, user tables and grouped tables are created through the Geronimo console. It then implements security by connecting to the sqlloginmodule of the Geronimo built-in Derby database, and matches the user name, password, and group with the information provided by the user at logon, allowing users in the table to access the forum.

In this article, the simple login system created in part 1th is expanded to include a user registration system that uses JSP. This allows new visitors to the customer's Web site to register and access the forum. First, you will learn about JSP and how they are implemented and their relationship to Geronimo. A Java servlet is then created to display forms that allow users to register by providing a user name, password, and e-mail address. The information is then submitted to the same servlet, which connects to the database and inserts a new record that contains information about the new user, allowing the user to log in.

Set up

Please refer to the beginning section in part 1th of this series for this part. Also, see the README.txt file in the compressed source file in the download section to get the modified directory structure.

In addition to the prerequisites listed in part 1th and the Java 2 SDK Standard Edition (J2SDK), you will also need to have EE 1.4 and JSP 2.0. JSP 2.0 is packaged with Java EE 1.4 and can be downloaded free of charge on the Sun Microsystems Web site.

Now it's time to start. Let's start with the introduction JSP.

Java Server Page

JSP is a form of Java technology for scripting languages. You can embed the Java language inside a Web page or create a Java class to act as a servlet. Like other scripting languages, JSP allows dynamic content to be generated based on content submitted to a Web page. However, the JSP and Servlet are written in the Java language, so they have the power of Cross-platform, Cross-platform portability using the Java language.

To fully understand the power of Geronimo, it is important to understand both JSP and servlet when building an application for Geronimo. You will now learn how to write simple. jsp files by writing the first script in JSP. Later in this article, you will learn how to write a servlet. The servlet is similar to the script written in JSP, but it is more secure because it is precompiled.

Scripting with JSP

The first JSP script will display the date and is written entirely in the Java language. Please create the jspscript.jsp file and define it as shown in Listing 1.

Listing 1. Scripting with JSP

<%
System.out.println("The　script　has　started");
java.util.Date　d　=　new　java.util.Date();

out.println(" out.println("This　is　my　first　script　written　in　JSP!<br>");
out.println("The　historic　time　of　this　event　is:　");
out.println(String.valueOf(d)　+　"<br>");
%>
Text　displayed　outside　of　the　JSP　script.<br>
<%
out.println("You　can　mix　and　match　how　you　display　text.");
out.println("</body> %>