Show List
Tutorials > JSP > JSP implicit objects

JSP implicit objects

JSP (JavaServer Pages) implicit objects are a set of pre-defined objects that are available in every JSP page without needing to be explicitly declared or initialized. These objects are automatically created by the JSP container at runtime and provide information about the environment, request, and response.

Here are some of the most commonly used implicit objects in JSP along with code examples:

  • request: The request object represents the client's request to the server and provides access to request parameters, headers, cookies, and more.
css
Copy code
<p>Client IP address: <%= request.getRemoteAddr() %></p>
  • response: The response object represents the server's response to the client and provides methods to set response headers, cookies, and more.
python
Copy code
<% response.setContentType("text/html"); %>
  • out: The out object represents the JSP writer and provides methods to write output to the client.
go
Copy code
<% out.println("Hello, world!"); %>
  • session: The session object represents a user's session and provides methods to store and retrieve session attributes.
python
Copy code
<% session.setAttribute("username", "John"); %>
  • application: The application object represents the JSP application and provides methods to store and retrieve application-wide attributes.
python
Copy code
<% application.setAttribute("siteName", "My Website"); %>
  • pageContext: The pageContext object provides access to all the other implicit objects as well as methods to handle page-level error handling.
makefile
Copy code
<% pageContext.include("/header.jsp"); %>

These implicit objects can be accessed directly in JSP pages using the syntax above. Keep in mind that some implicit objects may not be available in certain contexts or with certain containers, so it's important to check your environment's documentation to confirm which objects are available.



Next: JSP standard tag library

    Leave a Comment

  • captcha text