Ch04 JavaServer Pages (JSP)

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1 Ch04 JavaServer Pages (JSP) Introduce concepts of JSP Web components Compare JSP with Servlets Discuss JSP syntax, EL (expression language) Discuss the integrations with JSP Discuss the Standard Tag Library, Custom Tag Library Discuss JSP syntax, EL Discuss JSP debugging and testing Provide step by step tutorials on building, deploying, and using JSP components

2 Java Server Pages (JSP) The Java Server Pages (JSP) technology allows Web developers to generate static and dynamic HTTP contents. The JSP is just like the ordinary Web pages with some additional embedded Java code. For example, a simplest JSP page can just be a simple HTML page with a.jsp extension. <HTML> <BODY> <H1> This is a simplest JSP page <H1> </BODY> <HTML> This is the simplest JSP page, without any embedded Java code. It can be treated just like an HTML page.

3 Java Server Pages (JSP) (cont.) Of course almost all JSP pages have embedded Java code. This allows access to server-side data and implements busines logic. Java Server Pages are an extension of Java Servlet technology. JSP can not work without Servlet container support. When a Web server gets a JSP request from a client the JSP engine converts the JSP page into a Java Servlet code and compiles it into Servlet classes.

4 Java Server Pages (JSP) (cont.) The generated Servlet code is run on the Sevlet container and finally sends the results back to the Web client. The advantage of JSP is that it separates the HTTP presentation authoring and business logic process coding. JSP focuses on the data presentation while the other Web components such as Servlets, JavaBeans, custom tags, and EJB take care of business logic processing.

5 Java Server Pages (JSP) (cont.) With the JSP support two different type developers, Web page designers and Java code programmers, can work on different aspects of the same Web application and incorporate static contents and dynamic elements such as JSP action tags and JSP scripting elements. These JSP tags and JSP elements can easily access shared data; forward flow controls to other Web components, and include the outputs of other Web components. It greatly reduces coding compared with Java Servlet technology.

6 Java Server Pages (JSP) (cont.) JSP also makes the tag library extensible so that developers can develop their own reusable custom tags. The new features of JSP 2.0 such as Expression Language (EL) make Web server page authoring even easier. JSP provides a more consistent way for Web developers to access different types of data such as implicit server objects, JavaBeans, Servlets, and even other remote distributed data.

7 Java Server Pages (JSP) (cont.) JSP plays a role very similar to Microsoft ASP.NET and PHP in Web application development. ASP.NET only works on MS Windows platforms. JSP is a platform independent technology that almost all platforms and Web servers. JSP is extensible in that it supports a custom tag library but ASP does not. Also, JSP supports many more component technologies such as JavaBean components, EJB components, Tag components, and Web components.

8 Java Server Pages (JSP) (cont.) Both Servlets and JSP can produce Web dynamic contents via the HTTP protocol. Servlets handle the control processing in the middle tier of three tier Web application architectures. Examples where Servlets are the preferred choice are authentication, dispatching requests, and database connections. Servlet technology is the Java server programming language.

9 Java Server Pages (JSP) (cont.) JSP is a text-document based technology which supports two formats: JSP standard format and HTML/XML format. JSP is suitable to handle data presentation and Web page authoring. In the Model-View-controller (MVC) architecture JSP plays the role of View to present data to clients; Servlets play the role of Controller to take client requests, get request parameters, analyze the requests, make decisions based on the request, and transfer flow controls to other Web components. You should also know that Servlets and JSP need to work together with other Web components in a real world Web application.

10 JSP Basics JSP Life Cycle JSP is a Web server side programming technology based on Servlet technology. The JSP specification is built on the top of the Servlet API. Any JSP page is translated into a Java Servlet by a JSP engine at runtime so that the JSP life cycle is determined by Servlet technology. The JSP engine is a JSP specification implementation which comes with web servers that implement JSP. Tomcat is one example. When a request comes to a JSP page, it may come from client browser or come from another Web component such as a Servlet or JSP.

11 JSP Life Cycle (cont.) The Web server asks the JSP engine to check whether the JSP page has never been accessed before, or it has been modified since its last access. If this is the case the JSP engine will 1. Parse the JSP document to translate into a Servlet Java file 2. Compile the Servlet Java file into a class file. Then the Servlet container loads the Servlet class for execution and sends the results back to the client.

12 JSP Life Cycle (cont.) Process of a JSP page

13 JSP Life Cycle (cont.) JSP initialization The jspinit() method is executed first after the JSP is loaded. If the JSP developer needs to perform any JSPspecific initialization such as database connections at the beginning this method can be specified. <%!... %> is a JSP declaration element which is used to declare variable or methods. The jspinit() is only called once during any JSP component life time. <%! public void jspinit(){... } %>

14 JSP Life Cycle (cont.) JSP execution public _service(httpservletrequest req, HttpServletResponse res) is a JSP service method the same as the service() method of a Servlet class. This method never needs to be customized. All Java code defined in scripting elements are inserted in this method by JSP engine. JSP termination <%! public void jspdestroy(){... } %> This method allows developers to specify resource cleanup jobs such as database disconnections.

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