Thread: Important JSP tags

These types of tags are used primarily to import packages. Altenatively you can also use these tags to define error handling pages and for session information of JSP page.

1. Directives

These types of tags are used primarily to import packages. Altenatively you can also use these tags to define error handling pages and for session information of JSP page.

a- <%@page language="java" %>

b- <%@page language="java" session="true" %>

c- <%@page language="java" session="true" errorPage="error.jsp" %>

e- <%@page language="java" import="java.sql.*, java.util.*" %>

f- <%@ include file="/title.jsp"%>


2. Declarations

JSP declarations starts with '<%!' and ends with '%>'. In this you can make declarions such as int i = 1, double pi = 3.1415 etc. If needed, you can also write Java code inside declarations.

Example 1

Code: JSP

<%!

int radius = 7;
double pi = 3.1415;

%>

Example 2

Code: JSP

<%!

double radius = 7;
double pi = 3.1415;

double area()
{
return pi*radius*radius;
}

%>

3. Scriptlets

JSP Scriptlets starts with '<%' and ends with '%>'. This is where the important Java code for JSP page is written.

Example

Code: JSP

<%
String id, name, dob, email, address;

id = request.getParameter("id");
name = request.getParameter("name");
dob = request.getParameter("dob");
email = request.getParameter("email");
address = request.getParameter("address");

sessionEJB.addClient(id, name, dob, email, address);
%>

request, response, session and out are the variables available in scriptlets.