JSP BASICS PDF

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Introduction to JSP. JavaServer Pages (JSP) is a technology based on the Java language and enables the development of dynamic web sites. JSP was. ronaldweinland.info JSP Lifecycle. Browser generated Servlet. Compiled Servlet. JSP Page. Server Web. JSP: The Complete Reference . Part IV JSP and Other Web Components. 20 Communicating with Other Clients. .. A Simple JDBC Example.


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Java Server Pages (JSP) is a server-side programming technology that enables this tutorial you will find yourself at a moderate level of expertise in using JSP. 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. Figure 8: Output of simple ronaldweinland.info file with expressions and counter. west. ronaldweinland.info

Each EL expression evaluates to a single value that is then expressed as text in the output of the JSP when used in template text , or passed as a value to a JSP action. So those familiar with JavaScript should find the syntax familiar. Not so! Literals represent fixed values such as 3, 4, 's' and '' the empty string. Literal Values, Continued Numeric literals can be expressed as integer values such as 3 or , or as floating point values such as 2.

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.

Introduction to Developing Web Applications

Destroy the container invokes jspDestroy method. After that, Servlet page is compiled by the compiler and gets converted into the class file. Literal Values, Continued Numeric literals can be expressed as integer values such as 3 or , or as floating point values such as 2. Exponential notation such as 1. Integer literals are, by far, the most commonly used.

Text literals are delimited using either the single-quote character ' or the double-quote character ".

The same character must be used to delimit the beginning and the end of the literal. For example: "Hi there! There are two more types of literals: the Boolean literals, which consist of the values true and false, and the Null Literal consisting of the value null. Be aware that when an EL expression is used within the value of the attribute to a standard or custom action, quoting gets complicated as the attribute value itself is quoted using one of the single or double-quote characters.

Luckily, when using the EL in template text, these quoting issues rarely raise their head. Section 4 Introducing Scoped Variables Fixed values are all well and good, but the true strength of the EL lies in expressing dynamic values.

These values can be generated from a number of sources, but are always represented by scoped variables. The concept of a variable should be familiar: a named element that represents a dynamic value that can be assigned to it. But the concept of the JSP scopes may be new. These scopes define the order in which variable names are resolved, the lifetime of the variable, and its purview.

The scopes, in their default search order, are: page, request, session and application.

Basics pdf jsp

In Java code, these scoped variables are created by the setAttribute method of their respective Java classes. Lifetime of the application context. Scoped variables can be created in many places, but a very common scenario is for the page controller servlet to create scoped variables in request scope, then forward to a JSP page in order to display that data.

Introduction to JSP | JSP Tutorial | Studytonight

For example: This statement creates a request-scoped variable named greeting with the string value Hi there!.

Now let's see how we can use that variable in a JSP. Application scope is a very handy place to store information that needs to be made available to all resources within a web application. It's easy to establish such data whenever a web application starts up by doing so in context listener.

They provide global Debugging is the process to trace the error in the application. It is not very easy to trace bugs Following Spring interview questions are for freshers and experienced users 1 What is a spring?

Basics pdf jsp

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