JSP Basic - Lesson 3 - JSP Elements Posted by Unknown , Saturday, May 14, 2011 at 12:58 AM, in

There are 3 main JSP Elements:

1. Scripting
2. Directive
3. Action

1. Scripting:
There are 3 items in scripting element:

• Scriptlet: Where you place your java code inside JSP page

Ex: <%
for(int i=0;i<10;i++){
...
}
%>

<jsp:scriptlet>
for(int i=0;i<10;i++){
...
}
</jsp:scriptlet>

These are the same but do try to mix them in single jsp page because its scriptlet has different jspc to compile jsp page to servlet java page => it will confuse the server.

• Declaration: when you want to declare a variable within class in jsp page but not inside the method in jsp page:

Ex:
<%!
private int i =0;
%>

<jsp:declaration>
private int i =0;
</jsp:declaration>

• Expression: is used to display from java code inside jsp page to html page.

Ex:
<%=
calculation(10,10)
%>

<jsp:expression>
calculation(10,10)
</jsp:expression>

1. Directive

There are number of directives and most of them are page directive and most of them are:

• page import

Ex:
<%@ page import = "java.io" %>
<jsp:directive.page import = "java.io" />