Sendredirect will search the content between the servers. Oct 29, 2011 working with struts 2 interceptor with example struts on oct 29, 2011 9 comments by sivateja i n struts 1. Difference between getrequestdispatcher and getnameddispatcher difference between the requestdispatcher object and servletcontext object. What is the difference between requestprocessor and. The include method takes the content from another resource and includes it in the servlet. Hi manoj, you have mentioned one way of creating your own requestprocessor, but to locate services you should look at moduleconfig in detail. A requestdispatcher is an extremely important javas w class that allows for including content in a requestresponse or forwarding a requestresponse to a resource. What is differecne bw requestprocessor and requestdispatcher. How actionmapping tag is used for request forwarding in. This is the major difference between forward and sendredirect. There are three ways to obtain requestdispatcher object.
What are the classes used as part of struts framework. Let us make a table of differences include vs forward. 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 are the different cases for using sendredirect vs. In page x you have an include tag, this means that the control will be in the page x till it encounters include tag, after that the control will be transferred to page y. The requestdispatcher interface provides the facility of dispatching the request to another resource it may be html, servlet or jsp. In this case the control was in pagea til you called the include tag. What is request processor and how does it relates to action mapping. The request attribute under which the path information is stored for processing during a clude call. Difference between include, forward and sendredirect in. The request attribute under which the servlet path information is stored for processing during a clude call. There is a little difference between calling the forward and include method.
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 process the request from the controller. Struts is a open source implementation of mvc design pattern to develop large scale web applications. 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.
But in current version of struts, they have replaced requestprocessor with requestdispatcher. In order to dispatch the request we need to perform these tasks. Java requestdispatcher dispatching requests in java web. What is the difference between the request attribute and request parameter. Struts interview questions and answers for freshers and experienced in this series, we have covered all about. 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. Struts struts when submit a form and while submit is working,press the refresh. This interface can also be used to include the content of another resource also. Control can be forward to resources available within the server from where the call is made. Find answers to difference between getrequestdispatcher of servletcontext and servletrequest from the expert community at experts exchange. To understand the difference between these two methods, lets take an example. You cannot merge response output using this method. What is the difference between requestprocessor and requestdispatcher answer.
Introduction to resquest dispatcher in servlet studytonight. Mar 28, 2014 requestdispatcher is used whenever the programmer would like dispatch the request to another resource like html. Requestprocessor contains the processing logic that the struts controller servlet performs as it receives each servlet request from the container. What is the defferent between getnameddispatcher and. Difference between forward and sendredirect javapapers.
It instantiates each action once and allows others to be threaded through the original object. Struts 2 actions can still access the original request and response, if required. 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. Can anyone explain with a example and best usage of these methods with a real time exam. The difference between the two tags is that the way they work. What is the request processor in struts and how it works think.
Junior developers often get confused between the include and the forward methods of the requestdispatcher. What is the difference between requestdispatchers forward. 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. Struts framework makes it easier to design realible,scalable web applications in java. Java differecne between requestprocessor and requestdispatcher.
What is the request processor in struts and how it. Get a requestdispatcher object use the forward method or include method of requestdispatcher. Before explaining the difference between include,forward and sendredirect a small information on the request and response objects which is created by servlet container. Requestdispatacher interface with example programs and figurative explanation. It recieves the request from the client and makes decision where to send the request for further processing based on the. 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.
Controller is responsible for handling all the requests. What is the defferent between getnameddispatcher and getrequestdispatcher. 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. You can customize the request processing behavior by subclassing this class and overriding the methods whose behavior you are interested in.
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 difference between requestprocessor and request dispatcher. Struts basic questions and answers,struts subjective. Hi, i would like to know servlet requestdispatcher include and forward differences with good sample code examples. 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. The forward method intended for use in forwarding the request, meaning after the response of the calling servlet has been committed. Struts 1 binds objects into the page context by using the standard jsp mechanism. Requestdispatcher is an interface that enables the servlet container to dispatch the request from a web application to another within the same context. As a typical example, a servletw can use a requestdispatcher to include or forward a requestresponse to a jspw.
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. The requestdispatcher interface allows you to do a server side forwardinclude whereas sendredirect does a client side redirect. What is the difference between 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. Struts flow start with actionservlet then call to process method of requestprocessor. Struts main differences between struts 1 and struts 2 struts struts what is switchaction in struts. What is differecne betweenw requestprocessor and requestdispatcher. Well, i will say an example so that you can imagine it better.
Apr 08, 2008 what is differecne betweenw requestprocessor and requestdispatcher. Filterdispatcher is used in the early struts2 development, and its deprecated since struts 2. Where as request dispatcher will dispatchtransfer the. We can make a sublass of requestprocessor with our own version and modify how the request is processed. There are two methods defined in the requestdispatcher interface. It can be use to validate the data on the users browser as well as on the server side. A requestdispatcher object can be used to forward a request to the resource or to include the resource in a response. Struts framework provides the functionality to validate the form data. Or to say, used to connect to another web resource. The servlet delegates the handling of a request to a requestprocessor object. Struts framework emits the java scripts and it can be used validate the form data on the client browser.
What is the request processor in struts and how it works. We are going to describe requestdispatcher in java. This posting forward vs sendredirect discusses the difference between forward and sendredirect methods. Actionservlet treats all requests made to your struts application and delegates the heavy lifting stuff of handling the request to a requestprocessor object.