CODEWITHSUNDEEP
javaservlets
TCM
TCM

Reputation: 16920

How do i get ServletContext object in a simple class file?

I am creating a simple web application. I need to get reference to ServletContext object in that class. How can i get it?

Upvotes: 9

Views: 26948

Answers (2)

Ted Cahall
Ted Cahall

Reputation: 196

I had this issue, but since I had called the class from a JSP, I simply passed the HttpServletRequest "request" reference from the JSP to the class and made the call in the class to:

String appPath = request.getServletContext().getRealPath("");

Upvotes: -1

Bozho
Bozho

Reputation: 597382

You'd better pass it as argument to the constructor of your object, or set it using a setter method.

In fact, you may obtain the context attribute that is relevant to your object and pass only it via constructor/setter. For example:

YourClass obj = 
    new YourClass((AnotherClass) servletContext.getAttribute("yourAttribute"));

A much worse and more complication option is to:

  1. Create a ServletContextListener
  2. register it in web.xml with <listener><listener-class></listener-class></listener>
  3. on contextInitialized(..) get the ServletContext from the event and store it in a singleton - a static field somehwere.

Alternatively, you can do this on each request, using a ServletRequestListener and store it in a ThreadLocal instead.

Then you can obtain the value via calling your singleton/threadlocal holder like this:

ServletContextHolder.getCurrentServletContext()

Upvotes: 16

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