The Code for the HTML Page that Calls the JSP - Java
In this excerpt from chapter 4 of Joel Murach's Java Servlets and JSP, you'll learn how to develop a web application that consists of HTML pages and JavaServer Pages (JSPs). As you will see, JSPs work fine as long as the amount of processing that's required for each page is limited. When you complete this chapter, you should be able to use JSPs to develop simple web applications of your own.
Figure 2 presents the code for the HTML page that calls the JSP. If you've read chapter 3, you shouldn't have any trouble following it. Here, the Action attribute of the Form tag calls a JSP named show_email_entry.jsp that's stored in the same directory as the HTML page, and the Method attribute specifies that the HTTP Get method should be used with this action. Then, when the user clicks on the Submit button, the browser will send a request for the JSP.
Figure 2:The code for the HTML page that calls the JSP
<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>Chapter 4 - Email List application</title> </head> <body> <h1>Join our email list</h1> <p>To join our email list, enter your name and email address below. <br> Then, click on the Submit button.</p>
You should also notice the Name attributes of the three text boxes that are used in the table within this HTML page. These are the names of the parameters that are passed to the JSP when the user clicks on the Submit button. In Figure 1, the parameter names are firstName, lastName, and emailAddress and the parameter values are John, Smith, and email@example.com.
Figure 3 presents the code for the JSP. As you can see, much of the JSP code is HTML. In addition, though, Java code is embedded within the HTML code in the form of JSP scriptlets and expressions. Typically, a scriptlet is used to execute one or more Java statements while a JSP expression is used to display text. To identify scriptlets and expressions, JSPs use tags. To distinguish them from HTML tags, you can refer to them as JSP tags.
Figure 3:The Code for the JSP
<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>Chapter 4 - Email List application</title> </head> <body>