Calling a servlet from another servlet

[sravs]

Hi everyone, 

Is there any possibility that we can call a servlet from another servlet after receiving the response from the first servlet.

Note: Both the servlets are of POST method and both are of Path based servlets.

Please provide your inputs on this.

Regards,

Sravani

[Ganthimathi_R · Accepted solution]

@sravs 

You can call the servlet programmatically from another servlet in one of two ways, as per [1].

• To include another servlet's output, use the include() method from the RequestDispatcher interface. This method calls a servlet by its URI and waits for it to return before continuing to process the interaction. The include() method can be called multiple times within a given servlet.

  For example:

   RequestDispatcher dispatcher =
       getServletContext().getRequestDispatcher("/servlet/ShowSupplies");
    dispatcher.include(request, response);

• To handle interaction control to another servlet, use the RequestDispatcher interfaces forward() method with the servlet's URI as a parameter.

  This example shows a servlet using forward():

   RequestDispatcher dispatcher =
       getServletContext().getRequestDispatcher("/servlet/ShowSupplies");
    dispatcher.forward(request, response);

         

Here is the reference

[1] https://docs.oracle.com/cd/E19146-01/819-2634/abxbn/index.html

[2] https://www.geeksforgeeks.org/servlet-collaboration-java-using-requestdispatcher-httpservletresponse...

Hope this help!

[arunpatidar]

Hi,

Generally we don't do that. The best way to handle this kind of situation to encapsulate the logic in osgi service/component and reference these services in servlet.

So no need to make additional request.

Now Your servlet can refer both services