Therefore, you can pass data between them using request. Dec 07, 2014 java requestdispatcher in servlet example instance of java requestdispatcher in servlet instanceofjava this is the java programming blog on oops concepts, servlets jsp freshers and 1, 2,3 years expirieance java interview questions on java with explanation for interview examination. The following are top voted examples for showing how to use javax. Requestdispatcher object, difference between include and forward method. Behind the scenes struts will use a requestdispatcher, where the target servletjsp receives the same requestresponse objects as the original servletjsp. Mar 28, 2015 you have to do two things to implement custom request processor in struts. The requestdispatcher object has two methods, include and forward. In this example we have used jsp requestdispatcher. We are going to discuss about requestdispatcher in jsp. There are two methods defined in the requestdispatcher interface.
What is the difference between requestprocessor and. Get, post, doget, dopost, java servlet, request response by thakur arjun singh duration. The collection of static configuration information that describes a struts based module. Requestprocessor contains the processing logic that the struts controller servlet performs as it receives each servlet request from the container. Requestprocessor contains the processing logic that the actionservlet performs as it receives each servlet request from the container. What is the difference between requestprocessor and requestdispatcher. It is used to include the content of another resource also. What is the request processor in struts and how it works. Let us see a practical example of requestdispatcher include method. Create a class for example ownrequestprocessor extending class requestprocessor and override the method processpreprocess for example.
Java requestdispatcher dispatching requests in java web. It forwards the request from one servlet to another resource such as. Please suggest me how to add jsp files under this folder. The actionservlet and requestdispatcher are main players in the struts framework. Requestdispatcher interface can be used to forward and include resources such as jsp, servlets, html etc.
This is what javadoc says about requestdispatcher include. The requestprocessor class is the actual place where the request processing takes place in a struts controller environment. Multiple modules are identified by a prefix at the beginning of the context relative portion of the request uri. The response will not be sent back to the client and the web container for example, tomcat internally redirects the request to the other jspservlet. In struts framework we wil call request processor from doget. What are the differences bw requestprocessor and actionservlet. The servlet container creates the requestdispatcher object, which is used as a wrapper around a server resource located at a particular path or given by a particular name. Collected java questions class computer programming. Collected java questions free download as word doc. Java j2ee java interview questions free ebook download as pdf file. What is the request processor in struts and how it. Migrate from struts to spring mvc in 6 steps dzone java. I further extended the requestdispatcher class and implemented my own doforward method. I decided to start on a little personal project, mostly as a way to get on board with some techn.
Sep 09, 2006 but in current version of struts, they have replaced requestprocessor with requestdispatcher. The requestdispatcher interface provides the facility of dispatching the request to another resource it may be html, servlet or jsp. The requestdispatcher class enables your servlet to call another servlet from inside another servlet. If matching then it will take the type attribute value and load that class.
Behind the scenes struts will use a requestdispatcher, where the target servletjsp receives the same. 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 dopost or doget methods receive a request and invoke the process. Migrating from struts 1 to struts 2 raible designs. What is the use of requestprocessor, if we are having. The request attribute under which the path information is stored for processing during a clude call.
You can customize the request processing behavior by subclassing this class and overriding the methods whose behavior you are interested in changing. Actionservlet treats all requests made to your struts application and delegates the heavy lifting stuff of handling the request to a requestprocessor object. What is the difference between requestdispatchers forward. Requestdispatcher is an interface, implementation of which defines an object which can dispatch request to any resources. It provides an interface through which the servlets can collaborate with each other. Defines an object that receives requests from the client and sends them to any resource such as a servlet, html file, or jsp. This process method then looks into the struts config. This storefront application will demonstrate an ecommerce automotive parts supplier, but you.
Requestdispatcher are okay because the container does not intercept and cross check internal. Interview questions answers in servlets, struts, core java. This interface is intended to wrap servlets, but a servlet container can create requestdispatcher objects to wrap any type of resource. Dec 11, 20 requestdispatcher include method comes to the rescue. Struts user using forward and include using requestprocessor. This is more or less same as struts implementation but also calls includes. Actionservlet treats all requests made to your struts.
In essence, this method enables programmatic serverside includes. What is the use of requestprocessor, if we are having actionservlet in struts answer sk niloufer by default struts framework provides applicationcontroller design pattern in the form of requestprocessor whereas actionservlet is a replacement of frontcontroller design pattern implementation. Filterdispatcher is used in the early struts2 development, and its deprecated since struts 2. This bug also applies to files in the root dir, not just under webinf. Extending struts actionservlet and requestprocessor stack overflow.
Struts uses the requestprocessor class to perform the processing for all requests received by the actionservlet. Requestdispatcher the requestdispacher interface provides the facility of dispatching the request to another resource like html, servlet or jsp. Java j2ee java interview questions inheritance object. Oct 29, 2011 working with struts 2 interceptor with example struts on oct 29, 2011 9 comments by sivateja i n struts 1. Now i want to add jsp files under distportalinfjsp folder. The forward method of requestdispatcher will forward the servletrequest and servletresponse that it is passed to the path that was specified in getrequestdispatcherstring path. Jsp files i recently found a file in my my documents directory with a. These examples are extracted from open source projects. A requestdispatcher is created and the forward method is invoked on it. Strutsuser advice for struts expert wanting to try. I barely have a handle on j2se and have no idea how to deal with jsp files. Includes the content of a resource servlet, jsp page, html file in the response.
Hi manoj, you have mentioned one way of creating your own requestprocessor, but to locate services you should look at moduleconfig in detail. Requestprocessor vs actionservlet struts forum at coderanch. Java differecne between requestprocessor and requestdispatcher. Apr 08, 2008 requestdispatcher object, difference between include and forward method. The requestdispatcher interface defines an object that receives the request from client and dispatches it to the resource such as servlet, jsp, html file. Requestprocessor checks whether any tag is available in struts config. Actionservlet which intercept the request and calls requestprocessors process method for further processing requestprocessor read xml file, find the appropriate handler and handles request. If no module prefix can be matched, the default configuration with a prefix equal to a zerolength string is. This interface can also be used to include the content of another resource also. Hi, in general when you craeate jspdynpage the corresponding jsp file will be created i.