It inherits all the properties but it supports one more additional method called getmethodkey for all those mappings. Dispatchaction provides a mechanism for grouping a set of related functions into a single action, thus eliminating the need to create seperate actions for each functions. The use dispatchaction we need to extend our action class to org. Difference between action and dispatchaction classes career ride.
Jul 08, 2011 struts picks up the name from this file and redirects it to the value specified in the map. Use dispatchaction when a set of actions is closely related and separating them into multiple actions would result in duplication. Struts dispatchaction class is used to group similar functionality into a single action, and execute the function depends on the given parameter value. Difference between action and dispatch action in struts dispatch action class is used to group related action into one class. Nov 20, 2010 difference between get and post difference between get and post. It eliminates the need of creating multiple independent actions for each function.
Difference between action and dispatchaction in struts. Dispatchaction is one of the struts builtin action that provides a mechanism that facilitates having a set of related functionality in a single action. Dispatchaction helps us in grouping a set of related functions into a single action. An abstract action that dispatches to a public method that is named by the request parameter whose name is specified by the parameter property of the corresponding actionmapping. I am going to continue explore the struts and struts2 within few posts. Best practice however should be to implement the action interface or extend actionsupport. May 05, 2010 struts mappingdispatchaction class is used to group similar functionality into a single action class, and execute the function depends on parameter attribute of the corresponding actionmapping. Lookupdispatchaction is subclass of dispatchaction. You can try these interview questions and answers on java, j2ee, struts, spring, svn, rad, maven, xml, design pattern.
In this tutorial you will learn how to group a set of related functions into a single action using struts lookupdispatchaction. Difference between action and dispatch action in struts. Dispatchaction dispatches the action based on the parameter value. How many types of action clases are there in stuts. If wrong means please explain how please refer dispatchaction which is subclass of action. You might be wondering what the difference between forward action and. Dispatchaction, while a regular action extends from org. But this comes as default in struts2, we need to provide the qualified methods in the action class no need. In this tutorial you will learn how to group a set of related functions into a single action using struts dispatchaction. What is the difference between dispatch action and lookup. Mappingdispatchaction class is much like the dispatchaction class except that it. What is the difference between session scope and request scope when saving formbean. Difference between action and dispatchaction classes grouping related actions into one class is possible.
Heres an example to show the use of dispatchaction. But in action class a group related action into one class is not possible. In struts 2 all the actions by default provide this functionality. Eventactiondispatcher apache struts 2 wiki apache software. In which method of action class the business logic is executed.
Where as lookupdispatchaction which is a subclass of it. At last page we have a submit button when we click it it will store all jsps data which we provide will store into database. It is commonly accepted that struts has no concept of events. One of the builtin actions provided by the struts framework. There are other variants out there mappingdispatchaction, simpledispatchaction, and now selectaction.
What is difference between dispatchaction and mappingdispatchaction in struts. The other new flavors mentioned have some merit, but since you asked about lookupdispatchaction ill reiterate again why i hate it. Struts interview questions struts faqs jsf interview. Because those who are familiar with struts1, must know these basic difference, which is big difference in architecture and framework. New operator is to create an instance of the class where we already know the class name at the beginning. Here we have the major classification of struts actions. Here in this example you will learn more about struts lookupdispatchaction that will help. Suppose we have a requirement where we do not know the class name at the beginning and we get the class at the run time in such case we have to go for newinstance method. Mappingdispatchaction class is much like the dispatchaction class except that it uses a unique action corresponding to a new request, to dispatch the methods. First create a new dynamic web project and configure it as maven project. Jan 27, 20 dispatch action lookupdispatchaction its a parent class of lookupdispatchaction subclass of dispatch action dispatchaction provides a mechanism for grouping a set of related functions into asingle action, thus eliminating the need to create separate actions for each function.
Struts 179 struts interview questions and 816 answers by expert members with experience in struts subject. Switchaction is useful only if you have multiple modules in your struts application. Dynaactionform is a subclass of actionform that allows the creation of form beans. This action is useful for developers who prefer to combine many similar actions into a single action class, in order to simplify their application design. We have following types of action classes in struts. The dispatchaction uses a hidden request parameter to determine which method to invoke.
What are the major differences between html tags and strut specific html tags. Look up dispatch action purpose is similar to dispatch action. Hi friends, lookupdispatchaction is subclass of dispactaction class. Mappingdispatchaction is one of the builtin actions provided along with the struts framework. See explain struts dispatch action with an example. The collection of related functions into a single action is possible using this action. The difference between a get and a post is the way data is transferred to a servlet. Go to struts tutorials new what is difference between lookupdispatchaction and dispatchaction. But unlike dispatchaction, you have to write different various handlers for each function in struts config. Lookupdispatchaction looks into the resource bundle file and find out the corresponding key name. Discuss each question in detail for better understanding and in depth knowledge of struts. Method which is dispatched to when there is no value for specified request parameter included in the request. Several changes need to be done, when one plans to group the related action using action class.
Here i would like to add few points to mastan answer. What is switch action the switchaction cl provides a means to switch from a resource in one module to another resource in a different module. Difference between action and dispatchaction classes. Several changes need to be done, when one plans to. The calling code in jsp however has multiple submit buttons only differing in their names. However, if you use internationalization, this wont work because the label of the button could be in any number of languages. Note unlike dispatchaction, mapping characteristics may differ. What is the dispatchaction struts1 equivalent in strtus2. Struts1 provided the facility of having related action methods in a single action class,depending on the method parameter, the mapped methods were executed. Dispatchaction, lookupdispatchaction and mappingdispatchaction. Dispatch action lookupdispatchaction its a parent class of lookupdispatchaction subclass of dispatch action dispatchaction provides a mechanism for grouping a set of related functions into asingle action, thus eliminating the need to create separate actions for each function.
The lookupdispatchaction class is used when you wants to add struts s internalization functionality. The actionmapping instance used to select a particular action is passed on to that action, thereby providing access to any custom configuration information included with the actionmapping object. Discuss each question in detail for better understanding and indepth knowledge of struts. The main constraint in the dispatchaction is the method name in the action class and the button name in the jsp page should be the same.
Struts picks up the name from this file and redirects it to the value specified in the map. Grouping related actions into one class is possible using dispatchaction class. This class enables a user to collect related functions into a single action class. What is the difference between dispatchaction and dynamic method invocation in struts2. What is the differnece between look up dispatch and dispatch. Which is the best website that has a collection of. What is the difference between struts 1 vs struts 2. Heres an example to show the use of mappingdispatchaction. How you can retrieve the value which is set in the jsp page in the case of dynaactionform. Difference between dispatchaction and lookupdisactaction. By using struts built in action we can achieve this i. Which are the frequently asked interview questions for struts. The logindispatchaction includes two methods loginuser and resetform.
You use the same expression for both getting and setting the value of a property. To achieve this we have to extend the dispatchaction class in struts1. What is difference between lookupdispatchaction and dispatchaction. This jar file is already included in example for this tutorial. Rick reumann without trying to open up a whole other can of worms since there have been a bunch of recent threads concerning the dispatchlookup concept, i would stay away from the lookupdispatchaction. It provides mechanism to collect related functions into a single action and eliminates the need of creating multiple independent actions for each function.
What is the difference between dispatchaction and lookupdispatchaction in struts framework. Struts mappingdispatchaction class is used to group similar functionality into a single action class, and. Struts, struts examples, struts i18n application, struts i18n sample program, struts internationalization example program, struts sample programs posted in struts 1. One of the most likely questions asked in javastruts interview questions. It needs to create multiple independent actions for each function. Lookupdispatchaction provides a mechanism for grouping a set of related functions into a single action, thus eliminating the need to create seperate actions for each functions. Step by step struts tutorials and struts interview questions.
Difference between dispatchaction and lookupdispatchaction. This class functionality is similar to dispatchaction. Aug 14, 2012 using mappingdispatchaction class, you can write multiple related functions in into one action class and removes the creation of multiple action classes. The different kinds of actions are done by the following.
Jan 27, 20 posts about dispatchaction in struts written by mallik. The difference between lookupdispatchaction and dispatchaction is that the actual method that gets called in lookupdispatchaction is based on a lookup of a key value instead of specifying the method name directly. So you need to add this jar file to your project class path. An struts 2 action may implement an action interface, along with other interfaces to enable optional and custom services. But in dispatchaction we can use all methods add, delete, edit in single class which extends dispatchaction class. This is useful for developers who prefer to combine many related actions into a single action class. The difference between lookupdispatchaction and dispatchaction is that the actual method that gets called in lookupdispatchaction is based on a lookup of a. But here in lookupdispatchaction, we can have different names for the buttons and the methods. If these files happen to be missing or corrupt, it. What is the difference between dispatchaction and lookupdispatchaction. Dispatchaction selects the method to execute depending on the request parameter valuewhich is configured in the xml file. Feb, 2015 what is the difference between dispatchaction and dynamic method invocation in struts2.
Dispatchaction selects the method to execute depending on the request parameter value which is configured in the xml file. We can map this key name to a method name by overriding the getkeymethodmap method. Dispatchaction and lookupdispatchaction both are used to combine related operations into a single class, so that they can share common resources like helper methods without exposing them to other classes. To configure the use of this action in your struts config. Personally, ive just stuck with dispatchaction and like it. Any pojo object with a execute signature can be used as an struts 2 action object. The difference between the includeaction and the forwardaction is that we need. Dispatch action dispatches to a public method that is named by the request parameter whose name is specified by the parameter property of the corresponding. The basic difference is that lookupdispatchaction uses a map and the message key to look up hence the lookup part of the class name which method to run, while dispatchaction uses the parameter value directly. To use this functionality we need to create different methods with the similar signature of the execute method, only the name of the method changes.
You could then use dispatchaction and code the methods add, update, and delete, and struts would forward to the appropriate method based on the button pressed. This aggregation extends mappingdispatchaction class. Dispatchaction is another useful built in struts action. Difference between jsf framework and struts framework. Struts mappingdispatchaction class is used to group similar functionality into a single action class, and execute the function depends on parameter attribute of the corresponding actionmapping. What are the differences between dispatchaction and. An abstract action that dispatches to a public method that is named by the parameter attribute of the corresponding actionmapping. Struts 2 uses reflection to find an appropriate method which by default is the execute method. Struts dispatch action tutorial,struts dispatchaction example. How many different ways can you retrive the request parameters from within interceptor.
This action is useful for developers who prefer to combine many similar actions into a single action class, in. At run time, this class manages to delegate the request to one of the methods of the derived action class. With a get, the url will show each namevalue pair on the query. Struts mappingdispatchaction example struts mappingdispatch action org.