JavaServer Pages (JSP) is a technology based on the Java language and JSP is easy to learn and allows developers to quickly produce web sites and. Learn about Java Server Pages(JSP). JSP is a front end framework used in Java Enterprise applications. This tutorial teaches JSP by progressing from very. Declare initialization and finalization methods using JSP declaration %>. simple example of an HTTP Servlet. It responds to the GET. * method of .
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Java Server Pages (JSP) is a server-side programming technology that This tutorial has been prepared for the beginners to help them understand basic. JSP Tutorial in PDF - Learn JSP (Java Server Pages) in simple and easy steps starting from basic to advanced concepts with examples including Java JSP. Training Summary JSP (JavaServer Page) is a Java based server side In this tutorial, you will learn various concept of JSP like Java Servlets.
In Java server pages JSP, the execution is much faster compared to other dynamic languages. Java server pages JSP are always compiled before its processed by the server as it reduces the effort of the server to create process. The request is processed by a view layer which is JSP and then to servlet layer which is java servlet and then finally to a model layer class which interacts with the database. It is very much convenient to modify the regular HTML. We can write the servlet code into the JSP. It is only intended for simple inclusions which can use form data and make connections.
Reuse of components and tag libraries: The dynamic contents can be provided by reusable components such as JavaBean, Enterprise JavaBean EJB and tag libraries - you do not have to re-inventing the wheels. However, it is important to note that servlets and JSPs are complementary technologies, NOT replacement of each other. Servlet can be viewed as "HTML inside Java", which is better for implementing business logic - as it is Java dominant.
JSPs are often used for the View V , which mainly deals with presentation. We shall use the webapp called "hello" that we have created in our earlier exercise. From your browser, choose the "View Source" option to check the response message.
It should be either of the followings depending on the random number generated. The method request.
Check out the generated servlet for "first. The relevant part of the generated servlet is extracted as follows with some simplifications : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 out.
Hence, the expression will be evaluated, and the result of the evaluation written out as part of the response message. Subsequent accesses to the same JSP will be much faster, because they will be re-directed to the converted and compiled servlet directly no JSP-to-servlet conversion and servlet compilation needed again , unless the JSP has been modified.
Revisit Java Servlets A typical Java servlet as shown below contains three kinds of methods: init , destroy , and one or more service methods such as doGet and doPost. The service methods takes two arguments: request and response, corresponding to the HTTP request and response messages respectively. A PrintWriter called out is created for writing out the response to the network.
Any change to the web page's presentation such as background color and font size requires re-coding and re-compilation of servlet program. We can use all the features of the Servlet in JSP.
In addition to, we can use implicit objects, predefined tags, expression language and Custom tags in JSP, that makes JSP development easy.
In Servlet technology, we mix our business logic with the presentation logic. The Servlet code needs to be updated and recompiled if we have to change the look and feel of the application. Moreover, we can use EL, implicit objects, etc.
Initialization the container invokes jspInit method. Destroy the container invokes jspDestroy method. After that, Servlet page is compiled by the compiler and gets converted into the class file.
Moreover, all the processes that happen in Servlet are performed on JSP later like initialization, committing response to the browser and destroy. We have saved this file as index.