JSP Scriptlets

Syntax of JSP Scriptlet is:

<%

//your java code here

%>

A JSP Scriptlet begins with the sign <% and ends with the sign%>. Java code can be embedded in the JSP Scriptlet. JSP Engine places the code present in the scriptlet tag in the _jspService() method of the JSP page. Variables that are available to the JSP Scriptlet are:

• request:
  request is used to represent the client's request and is a subclass of HttpServletRequest. This variable is used to retrieve the data which was submitted along the request.
  Example:
  <%
  //java code
  String name=null;
  name=request.getParameter("user_name");
  %>
• response:
  response is subclass of HttpServletResponse. This is used to send a response.
  Example:
  <% response.sendRedirect(“nextPage.jsp”);%>
• session:
  session represents the HTTP session object associated with the request.
  Example:
  <%session.getAttribute(“attribute_name”);%>
• out:
  out is an object of output stream and is used to send any output to the client.
  Example:
  <%out.println(“Hello World”);%>
  This will print Hello World on the web page.
  
  

Other variables that are available to the scriptlet are pageContext, application,config and exception.