Difference between include, forward and sendredirect in. Oct 29, 2011 working with struts 2 interceptor with example struts on oct 29, 2011 9 comments by sivateja i n struts 1. Junior developers often get confused between the include and the forward methods of the requestdispatcher. What are the different cases for using sendredirect vs. Mar 28, 2014 requestdispatcher is used whenever the programmer would like dispatch the request to another resource like html. Struts 2 actions can still access the original request and response, if required. Introduction to resquest dispatcher in servlet studytonight. The forward method intended for use in forwarding the request, meaning after the response of the calling servlet has been committed. This is the major difference between forward and sendredirect. As a typical example, a servletw can use a requestdispatcher to include or forward a requestresponse to a jspw. The difference between the two methods is that the forward method will close the output stream after it has been invoked, whereas the include method leaves the output stream open. What is the difference between requestprocessor and requestdispatcher.
Filterdispatcher is used in the early struts2 development, and its deprecated since struts 2. But in current version of struts, they have replaced requestprocessor with requestdispatcher. What is difference between requestdispatcher and sendredirect hi mak, requestdispatcher forward method pass the control of the request to another servlet or jsp without telling anything about the request dispatch to the client browser. What is the difference between requestprocessor and. What is the difference between requestdispatchers forward. Get a requestdispatcher object use the forward method or include method of requestdispatcher. Let us make a table of differences include vs forward. Actionservlet treats all requests made to your struts application and delegates the heavy lifting stuff of handling the request to a requestprocessor object.
Find answers to difference between getrequestdispatcher of servletcontext and servletrequest from the expert community at experts exchange. Request dispatcher is an interface which supports for dispatching request from one page to another page in a applicationpage may be a servlet file,jsp. Requestprocessor contains the processing logic that the struts controller servlet performs as it receives each servlet request from the container. Example demonstrating usage of requestdispatcher in this example, we will show you how requestdispatcher is used to forward or include response of a resource in a servlet. You cannot merge response output using this method. Where as request dispatcher will dispatchtransfer the. What are the classes used as part of struts framework. Struts main differences between struts 1 and struts 2 struts struts what is switchaction in struts.
Struts interview questions and answers for freshers and experienced in this series, we have covered all about. Sendredirect will search the content between the servers. The key difference between the two is the fact that the forward method will close the output stream after it has been invoked, whereas the include method leaves the output stream open. What is the defferent between getnameddispatcher and. What is the defferent between getnameddispatcher and getrequestdispatcher. Struts framework emits the java scripts and it can be used validate the form data on the client browser. Difference between getrequestdispatcher of servletcontext. We can make a sublass of requestprocessor with our own version and modify how the request is processed. Struts is not only thread safe but also thread dependent. What is differecne bw requestprocessor and requestdispatcher. In a struts application you usually have your operations performed by creating action classes, each action taking care of its own different stuff. Request dispatcher is an interface which supports for dispatching request from one page to another page in a applicationpage may be a servlet file,jsp etc.
Java differecne between requestprocessor and requestdispatcher. It instantiates each action once and allows others to be threaded through the original object. Difference between getrequestdispatcher and getnameddispatcher difference between the requestdispatcher object and servletcontext object. Can anyone explain with a example and best usage of these methods with a real time exam. What is difference between requestprocessor and request dispatcher. Another difference between the two is that path of the getrequestdispatchestring path of the servletrequest interface cannot extend outside the current servlet context whereas getrequestdispatcherstring path of the servletcontext can use the getcontextstring uripath method to obtain requestdispatcher for resources in foreign contexts. Struts is a open source implementation of mvc design pattern to develop large scale web applications. It can be use to validate the data on the users browser as well as on the server side. The difference between the two tags is that the way they work. This interface can also be used to include the content of another resource also. What is the request processor in struts and how it works think. Before explaining the difference between include,forward and sendredirect a small information on the request and response objects which is created by servlet container. How actionmapping tag is used for request forwarding in struts configuration file.
What is the request processor in struts and how it works. Java requestdispatcher dispatching requests in java web. Requestdispatcher is an interface that transfers the control from current web resource to another web resource such as a servlet, html, jsp on the server. Struts framework makes it easier to design realible,scalable web applications in java. Controller is responsible for handling all the requests. This posting forward vs sendredirect discusses the difference between forward and sendredirect methods. Difference between filterdispatcher and strutsprepareandexecutefilter in struts 2 december, 20 by krishna srinivasan leave a comment if you are working on the struts 2 applications, you would have noticed that while configuring the struts 2 filter in your web.
It recieves the request from the client and makes decision where to send the request for further processing based on the. Struts basic questions and answers,struts subjective. What is differecne betweenw requestprocessor and requestdispatcher. What is the difference between the request attribute and request parameter. In order to dispatch the request we need to perform these tasks. The requestdispatcher interface allows you to do a server side forwardinclude whereas sendredirect does a client side redirect. A requestdispatcher object can be used to forward a request to the resource or to include the resource in a response. How actionmapping tag is used for request forwarding in. What is the difference between requestprocessor and requestdispatcher answer.
We are going to describe requestdispatcher in java. Struts framework provides the functionality to validate the form data. Struts struts when submit a form and while submit is working,press the refresh. Requestdispatacher interface with example programs and figurative explanation. What is the request processor in struts and how it. Apr 08, 2008 what is differecne betweenw requestprocessor and requestdispatcher. Struts 1 binds objects into the page context by using the standard jsp mechanism. Struts 2 uses a valuestack technology to make the values accessible to the taglibs without coupling the view to the object to which it is rendering. Sep 09, 2006 what is the request processor in struts and how it works posted on september 9, 2006 by sharat the requestprocessor class is the actual place where the request processing takes place in a struts controller environment. This transfer of control is done by the container internally and browser client is not involved. Hi, i would like to know servlet requestdispatcher include and forward differences with good sample code examples.
Struts flow start with actionservlet then call to process method of requestprocessor. To understand the difference between these two methods, lets take an example. In this case the control was in pagea til you called the include tag. You can customize the request processing behavior by subclassing this class and overriding the methods whose behavior you are interested in. The include method takes the content from another resource and includes it in the servlet. Requestprocessor process the request from the controller. Well, i will say an example so that you can imagine it better. The request attribute under which the path information is stored for processing during a clude call. Following figures give the visual difference you can grasp include vs forward. What is request processor and how does it relates to action mapping. Control can be forward to resources available within the server from where the call is made.
There are two methods defined in the requestdispatcher interface. There is a little difference between calling the forward and include method. The request attribute under which the servlet path information is stored for processing during a clude call. Hi manoj, you have mentioned one way of creating your own requestprocessor, but to locate services you should look at moduleconfig in detail. Difference between forward and sendredirect javapapers.
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