What is the difference between forward() and include()

If you're curious how Git works under the hood, you'll enjoy this. It is a common practice that a controller redirects to another resource after processing a request, the resource could be either a view which displays the result of processing or even another controller which needs to do further processing on the request. In this tutorial, we explain the different ways of redirecting requests from servlet to another resource. Basically we talk about 3 methods forward , sendRedirect and include.

We define them, compare their usage and provide a situation for using each of them. A typical situation is when you redirect to another resource after processing a post request like form submission. In this case, if you use forward as a redirection mechanism, you will end up returning a result page with exactly the same address url and any additional attempt to reload the page would cause a double submit problem. This way, when end user refreshes the browser he will be just refreshing the result view.

In general, a forward request should be used if the operation can be safely repeated upon a browser reload of the resulting web page; otherwise, redirect is preferable. Typically, if the operation performs an edit on the data store, then a redirect not a forward is recommended, this is simply to avoid the possibility of inadvertently duplicating an edit to the database.

On the other hand, If you include a Servlet or JSP document, the included resource must not attempt to change the response status code or HTTP headers, any such request will be ignored. Feel free to comment, ask questions if you have any doubt. Pages Home core java spring online courses thread java 8 coding sql books oop interview certification free resources best. Tuesday, July 6, Difference between include and forward methods of RequestDispatcher in Servlert. What is the difference between include and forward methods of RequestDispatcher interface is one of the frequently asked Servlet questions from Java EE interviews and we'll see how you can answer this question on your interview.

You get the RequestDispatcher reference either from ServletContext or ServletRequest interface and even though both include and forward method allow a Servlet to interact with another servlet, the main difference between include and forward is that the include method is used to load the contents of the specified resource could be a Servlet, JSP, or static resource like HTML files directly into the Servlet's response, as if it is part of the calling Servlet.

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