I am making a servlet for attendance. So in the doGet() method all the front end is displayed and if any error is generated ; i.e., something is left blank then the doPost() method should call the doGet() again for completing the blank spaces.
How can I call doGet() method from the same servlet's doPost()?
If I take your question literally (i.e. invoke doGet() from doPost()), you can just invoke the doGet() method... it's a standard method like any other.
Here's a tip: When the doPost() and doGet() methods share a common set of logic, it's a good practice to isolate that logic into a separate (private) method that is to be invoked by all relevant do***() methods. For example:
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// GET-based logic
processCommonLogic();
// Other GET-based logic
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// POST-based logic
processCommonLogic();
// Other POST-based logic
}
private void processCommonLogic() /* throws ServletException and/or IOException if needed */ {
// Common logic
}
You can use this pattern to create a processError() method that can be invoked wherever you need it.
However, if the scope your question goes beyond invoking doGet() from doPost(), I suggest you have a look at the references pointed by Alain O'Dea.
You can do that, it's a simple
this.doGet(req, resp);
return;
However, it's not a best practice. Generally better to implement view logic as a JSP, and dispatch to it from the post logic...
this. getServletConfig().getRequestDispatcher("my_view.jsp")
.forward(req,resp);;
return;
Or use include(), or an MVC framework like Struts...
