Difference between dispatchaction and mappingdispatchaction in struts

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. 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. What is the difference between struts 1 vs struts 2. 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. This is useful for developers who prefer to combine many related actions into a single action class. Lookupdispatchaction looks into the resource bundle file and find out the corresponding key name. Step by step struts tutorials and struts interview questions.

It provides mechanism to collect related functions into a single action and eliminates the need of creating multiple independent actions for each function. Dispatchaction is one of the struts builtin action that provides a mechanism that facilitates having a set of related functionality in a single action. One of the builtin actions provided by the struts framework. But in dispatchaction we can use all methods add, delete, edit in single class which extends dispatchaction class. Struts mappingdispatchaction class is used to group similar functionality into a single action class, and. Here we have the major classification of struts actions. The difference between lookupdispatchaction and dispatchaction is that the actual method that gets called in lookupdispatchaction is based on a lookup of a. Nov 20, 2010 difference between get and post difference between get and post. 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. There are other variants out there mappingdispatchaction, simpledispatchaction, and now selectaction.

To achieve this we have to extend the dispatchaction class in struts1. If these files happen to be missing or corrupt, it. Dispatchaction helps us in grouping a set of related functions into a single action. What is the differnece between look up dispatch and dispatch. 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. The dispatchaction uses a hidden request parameter to determine which method to invoke. 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.

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 dispatchaction and dynamic method invocation in struts2. The use dispatchaction we need to extend our action class to org. The calling code in jsp however has multiple submit buttons only differing in their names. This class functionality is similar to dispatchaction. 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. The difference between the includeaction and the forwardaction is that we need. Dispatchaction selects the method to execute depending on the request parameter value which is configured in the xml file. Any pojo object with a execute signature can be used as an struts 2 action object.

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. This jar file is already included in example for this tutorial. 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. New operator is to create an instance of the class where we already know the class name at the beginning. But unlike dispatchaction, you have to write different various handlers for each function in struts config. Difference between action and dispatch action in struts. Struts dispatch action tutorial,struts dispatchaction example.

You can try these interview questions and answers on java, j2ee, struts, spring, svn, rad, maven, xml, design pattern. An struts 2 action may implement an action interface, along with other interfaces to enable optional and custom services. Several changes need to be done, when one plans to. If wrong means please explain how please refer dispatchaction which is subclass of action.

Mappingdispatchaction class is much like the dispatchaction class except that it uses a unique action corresponding to a new request, to dispatch the methods. To configure the use of this action in your struts config. 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. In which method of action class the business logic is executed. Struts1 provided the facility of having related action methods in a single action class,depending on the method parameter, the mapped methods were executed. Difference between dispatchaction and lookupdisactaction.

Here in this example you will learn more about struts lookupdispatchaction that will help. Where as lookupdispatchaction which is a subclass of it. One of the most likely questions asked in javastruts interview questions. We have following types of action classes in struts. How you can retrieve the value which is set in the jsp page in the case of dynaactionform. But in action class a group related action into one class is not possible.

Feb, 2015 what is the difference between dispatchaction and dynamic method invocation in struts2. What are the major differences between html tags and strut specific html tags. In this tutorial you will learn how to group a set of related functions into a single action using struts lookupdispatchaction. See explain struts dispatch action with an example. We can map this key name to a method name by overriding the getkeymethodmap method. 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. Mappingdispatchaction class is much like the dispatchaction class except that it. What is the dispatchaction struts1 equivalent in strtus2. Use dispatchaction when a set of actions is closely related and separating them into multiple actions would result in duplication.

The difference between a get and a post is the way data is transferred to a servlet. Here i would like to add few points to mastan answer. What is difference between dispatchaction and mappingdispatchaction in struts. 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. Eventactiondispatcher apache struts 2 wiki apache software. The other new flavors mentioned have some merit, but since you asked about lookupdispatchaction ill reiterate again why i hate it. Dynaactionform is a subclass of actionform that allows the creation of form beans.

Note unlike dispatchaction, mapping characteristics may differ. The lookupdispatchaction class is used when you wants to add struts s internalization functionality. An abstract action that dispatches to a public method that is named by the parameter attribute of the corresponding actionmapping. It needs to create multiple independent actions for each function. How many different ways can you retrive the request parameters from within interceptor. Method which is dispatched to when there is no value for specified request parameter included in the request. Difference between jsf framework and struts framework. Heres an example to show the use of mappingdispatchaction. What are the differences between dispatchaction and. First create a new dynamic web project and configure it as maven project. Struts 2 uses reflection to find an appropriate method which by default is the execute method.

How many types of action clases are there in stuts. You use the same expression for both getting and setting the value of a property. It is commonly accepted that struts has no concept of events. What is the difference between dispatch action and lookup. Struts dispatchaction class is used to group similar functionality into a single action, and execute the function depends on the given parameter value. Switchaction is useful only if you have multiple modules in your struts application. Discuss each question in detail for better understanding and in depth knowledge of struts. 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. This is the most useful type among the four types available. What is the difference between session scope and request scope when saving formbean. Struts 2 provides a base actionsupport class to implement commonly used interfaces. In struts 2 all the actions by default provide this functionality. The collection of related functions into a single action is possible using this action.

Because those who are familiar with struts1, must know these basic difference, which is big difference in architecture and framework. What is the difference between dispatchaction and lookupdispatchaction in struts framework. 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. Personally, ive just stuck with dispatchaction and like it. The different kinds of actions are done by the following. Look up dispatch action purpose is similar to dispatch action.

This aggregation extends mappingdispatchaction class. This class enables a user to collect related functions into a single action class. Discuss each question in detail for better understanding and indepth knowledge of struts. You might be wondering what the difference between forward action and. Struts 179 struts interview questions and 816 answers by expert members with experience in struts subject. It inherits all the properties but it supports one more additional method called getmethodkey for all those mappings. Difference between dispatchaction and lookupdispatchaction. Struts mappingdispatchaction example struts mappingdispatch action org. Struts picks up the name from this file and redirects it to the value specified in the map. It eliminates the need of creating multiple independent actions for each function.

Heres an example to show the use of dispatchaction. By using struts built in action we can achieve this i. Lookupdispatchaction is subclass of dispatchaction. Best practice however should be to implement the action interface or extend actionsupport. Struts interview questions struts faqs jsf interview. Difference between action and dispatchaction in struts. At run time, this class manages to delegate the request to one of the methods of the derived action class. But here in lookupdispatchaction, we can have different names for the buttons and the methods. Difference between action and dispatchaction classes. However, if you use internationalization, this wont work because the label of the button could be in any number of languages.

Dispatchaction dispatches the action based on the parameter value. Struts, struts examples, struts i18n application, struts i18n sample program, struts internationalization example program, struts sample programs posted in struts 1. But this comes as default in struts2, we need to provide the qualified methods in the action class no need. 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. Which are the frequently asked interview questions for struts.

Hi friends, lookupdispatchaction is subclass of dispactaction class. Difference between action and dispatchaction classes grouping related actions into one class is possible. 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. Which is the best website that has a collection of. What is difference between lookupdispatchaction and dispatchaction. 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. Dispatchaction selects the method to execute depending on the request parameter valuewhich is configured in the xml file. With a get, the url will show each namevalue pair on the query.

Jan 27, 20 posts about dispatchaction in struts written by mallik. Struts lookupdispatchaction example in this tutorial you will learn how to group a set of related functions into a single action using struts lookupdispatchaction. So you need to add this jar file to your project class path. Jul 08, 2011 struts picks up the name from this file and redirects it to the value specified in the map. 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. Grouping related actions into one class is possible using dispatchaction class. The logindispatchaction includes two methods loginuser and resetform. 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. Go to struts tutorials new what is difference between lookupdispatchaction and dispatchaction. What is the difference between dispatchaction and lookupdispatchaction.

I am going to continue explore the struts and struts2 within few posts. Dispatchaction is another useful built in struts action. 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. Dispatchaction, while a regular action extends from org. This action is useful for developers who prefer to combine many similar actions into a single action class, in.