JAVA SERVER PAGES -by Rubeena Memon Deepti Jain Jaya Thakar Jisha Vettuventra

What is JSP? JSP is a technology used to generate dynamic HTML on the server side. It lets you separate the dynamic part of your pages from the static HTML. You simply write the regular HTML in the normal manner, using whatever Web-page- building tools you normally use.

(Contd.) You then enclose the code for the dynamic parts in special tags, most of which start with " ". Although what you write often looks more like a regular HTML file than a servlet, behind the scenes, the JSP page just gets converted to a normal servlet, with the static HTML simply being printed to the output stream associated with the servlet's service method.

Types of JSP Constructs Aside from the regular HTML, there are three main types of JSP constructs that you embed in a page:. Scripting elements :They let you specify Java code that will become part of the resultant servlet. Directives :lets you control the overall structure of the servlet.

Steps of JSP Requests oClient Requests a JSP Page. oThe JSP engine compiles the JSP into a servlet oThe generated servlet is compiled and loaded. oThe compiled servlet services the request and sends a response back to the client.

(Contd.) Actions let you specify existing components that should be used, and otherwise control the behavior of the JSP engine

Syntax Summary JSP Expression JSP scriptlet JSP Declaration JSP page Directive JSP include Directive JSP Comment

(Contd.) The jsp:include Action The jsp:useBean Action or The jsp:setProperty Action

(Contd.) The jsp:getProperty Action The jsp:forward Action

Advantages of JSP vs. ASP: ASP is a similar technology from Microsoft. In JSP, dynamic part is written in Java, not Visual Basic or other MS-specific language, so it is more powerful and easier to use. Second, it is portable to other operating systems and non-Microsoft Web servers.

Vs. Servlets JSP doesn't give you anything that you couldn't in principle do with a servlet. But it is more convenient to write regular HTML than to have a zillion println statements that generate the HTML. Plus, by separating the look from the content you can put different people on different tasks.

Vs. Javascript JavaScript can generate HTML dynamically on the client. It only handles situations where the dynamic information is based on the client's environment. Since it runs on the client. JavaScript can't access server-side resources like databases, catalogs, pricing information, and the like.

Project Overview Aim: Generating students mess bills. Interfaces:.Student Interface : View Mess Bill View Balance in Bank After Authentication,. Mess Manager’s Interface : Compute Bills

Mess Manager’s Interface(contd.) Display Bills (With or Without Details) Update Bills Record Expenditure Display Expenditure Display Fines