Java Server Page

JSP tag is used to execute the java code in JSP program. Four main Tag is-

• Declaration Tag (Syntax: <%! ........ %>)
• Expression Tag (Syntax: <%= ........ %>)
• Directive Tag (Syntax: <%@ .......%>)
• Scriptlet Tag (Syntax: <% ........ %>)
• Action Tag:

1. JavaBeans

   (Syntax:<jsp:useBean id=" " scope="page" class="
   " type=" " beanName=" " />)
   id="beanInstanceName"
   scope="page|request|session|application"
   		page:  valid until page is complete.
   request: bean instance lasts for the client request.
   session: bean lasts for the client session. 
   application: bean instance created and lasts
   until application ends.
    class & type ="package.class"
    beanName="{package.class | <%= expression %>}"
    type="package.class".
   

2. Dynamic JSP Include

    (Syntax:   <%@include file="" %>)
   This is used to include common pages that are shared,
   and include at the compile time.
   <jsp:include page="page.html/page.jsp"
   flush="false/true" >
       This is used to include page at the run time.