Calling Servlet from Servlets in Java

I gathered information from environment and sharing you this information with all.
When Ever you want to call any servlet from another servlet We can use two ways:-

• A servlet can make an HTTP request of another servlet. Opening a connection to a URL
• A servlet can call another servlet’s public methods directly, if the two servlets run within the same server.

I will let you know the second way to calling the servlet. To call another servlet’s public methods directly, you must:

• You Should know the name of servlet that you want to call.
• Acquire access to that servlet’s Servlet object
• Calling the servlet’s public method

To get the object of servlet, use the ServletContext object’s getServlet method. Get the ServletContext object from the ServletConfig object stored in the Servlet object. An example should make this clear. When the EmployeeDetail servlet calls the BookDB servlet, the EmployeeDetail servlet obtains the EmployeeDB servlet’s Servlet object like this:

Once you have the servlet object, you can call any of that servlet’s public methods. For example, the EmployeeDetail servlet calls the EmployeeDB servlet’s get getEmployeeDetail method:

You Should take care of the few things.If your servlet is following the singlethreadedModel interface then your call violate that single threaded model. Then you should implement the first way..

public class EmployeeDetail extends HttpServlet {

public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
...
EmployeeDBdatabase = (EmployeeDB)
getServletConfig().getServletContext().getServlet(employeedB);
EmployeeDetail bd = database.getEmployeeDetails(empId);
...
}
}