An abstract action that dispatches to the subclass mapped executes method. Struts mappingdispatchaction example struts mappingdispatch action org. An actionmapping is designed to be the target of an html form. This jar file is already included in example for this tutorial. Lookupdispatchaction class can group the similar functions in to a single action.
Struts provides four important classes for this purpose. What is difference between lookupdispatchaction and. Dispatchaction actiondispatcher lookupdispatchaction and mappingdispatchaction. This is useful for developers who prefer to combine many related actions into a single action class. In case of dispatchaction, you have to declare the method name in the jsp page. In this type of aggregation the action class must extend dispatchaction class as shown. Our class useraction class extends lookupdispacthaction. This is useful in cases where an html form has multiple submit buttons with the same name. It contains dispatchaction lookupdispatchaction switchaction and baseaction. Dispatchaction selects the method to execute depending on the request parameter value which is configured in the xml file. Herewith we discussed in detail about the struts actions named. This object is a little more work to setup that the original dispatchaction, but lets you use this technique without using javascript as a crutch. In case of lookupdispatchaction there is no rule to same the button names and method names and in lookupdispatchaction there.
If javascript is not an option, another good alternative is the lookupdispatchaction org. It eliminates the need to create separate independent actions for each function. In case of dispatchaction, you have to declare the method name in the. 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. What is the difference between dispatch action and lookup. Lookupdispatchaction looks into the resource bundle file and finds out the corresponding key name. Lookupdispatchaction is subclass of dispatchaction in case of dispatchaction, we have to declare the method name in the jsp page. The important dispatchers that struts provides includes. Hi, dispatchaction dispatches the action based on the parameter value.
Note unlike dispatchaction, mapping characteristics may differ. Dispatchaction dispatches the action based on the parameter value. 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. Describe the main difference between lookupdispachaction and dispatchaction classes. Dispatchaction, actiondispatcher, lookupdispatchaction and mappingdispatchaction. You might be wondering what the difference between forward action and include. 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. What are the differences between dispatchaction and. Difference between action and dispatch action in struts. It eliminates the need of creating multiple independent actions for each function. What is the differnece between look up dispatch and. We can map this key name to a method name by overriding the getkeymethodmap method. The difference between lookupdispatchaction and dispatchaction is that the actual method that gets called in lookupdispatchaction is based on a lookup of a.
Struts defines several subclasses of action class that perform eventdispatching, like dispatchaction, lookupdispatchaction, mappingdispatchaction, eventdispatchaction. Any software application is defined by the things it can do for you. So you need to add this jar file to your project class path. This class does not provide an implementation for the execute method. Posts about dispatchaction in struts written by mallik. Programming, web development, and devops news, tutorials and tools for beginners to experts. This is useful for developers who prefer to combine many related actions. The message key is then mapped to the name of the dispatch method. Q1 what is difference between these classes dispatchaction vs lookupdispatchaction vs eventdispatchaction vs mappingdispatchaction. 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. Mappingdispatchaction class is much like the dispatchaction class except that it uses a unique action. Mappingdispatchaction is one of the builtin actions provided along with the struts framework. This class enables a user to collect related functions into a single action class.
Struts dispatchaction class is used to group similar functionality into a single action, and execute the function depends on the given parameter value. Includeaction dispatchaction switchaction downloadaction lookupdispatchaction mappingdispatchaction localedispatchaction execute method signature public actionforward execute actionmapping mapping. Struts 179 struts interview questions and 816 answers by expert members with experience in struts subject. Difference between dispatchaction and lookupdisactaction. What is difference between lookupdispatchaction and dispatchaction. Can anybody tell me whats difference between action and dispatchaction in struts. Grouping related message handlers in one action class reduces number of classes and often reduces number of mappings in strutsconfig. Switch action to switch between different modules in struts application the important dispatchers that struts provides includes. First create a new dynamic web project and configure it as maven project.
Difference between the dispatchaction and dispatchlookup action is that the latter does a reverse lookup to match the localized value submitted for the button back to the message key. Strutsmanualactionclasses apache struts 2 wiki apache. Hundreds of free publications, over 1m members, totally free. Heres an example to show the use of mappingdispatchaction. The method to execute on a dispatchaction is determined by struts based on the value of a specified request parameter. 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.
Actiondispatcher, lookupdispatchaction and mappingdispatchaction. Myknowledgebook a learning experience of java and j2ee. The apr based apache tomcat native library which allows optimal performance in. We have following types of action classes in struts. 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. What is the difference between dispatchaction and lookupdispatchaction. Dispatchaction, lookupdispatchaction and mappingdispatchaction. Lookupdispatchaction class is much like the dispatchaction. 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. Lookupdispatchaction apache struts api documentation. An abstract action that dispatches to a public method that is named by the request parameter whose name is specified by the. This class does not provide an implementation of the execute. Lookupdispatchaction is subclass of dispatchaction.
Try those examples and try to work with remaining actions also. Struts mappingdispatchaction class is used to group similar functionality into a single action class, and. Action will extends lookupdispatchaction and you have to override getkeymethodmap method like this below. Dispatchaction is nothing but combination of different actions into one action but in this case in form the button names and the method names must be same. The dispatchaction uses the execute method to manage delegating the request to the individual methods based on the incoming request parameter method. 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. Difference between action and dispatch action in struts i am working in struts project. View profile view forum posts private message junior member join date jul 2008 answers 1.
To configure the use of this action in your strutsconfig. This class does not provide an implementation for the execute method because dispatchaction class itself implements this method. Using dispatchaction class, you can write multiple actions in into one action class and removes the creation of multiple action classes. Look up dispatch action purpose is similar to dispatch action. 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. Eventactiondispatcher apache struts 2 wiki apache software. Forwardaction, includeaction, switchaction and dispatchaction in addition with lookupdispatchaction with some examples.
The use dispatchaction we need to extend our action class to org. It inherits all the properties but it supports one more additional method called getmethodkey for all those mappings. Discuss each question in detail for better understanding and indepth knowledge of struts. Lookupdispatchaction, eventdispatchaction, mappingdispatchaction. 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.
The button name is specified by the parameter property of the corresponding actionmapping. Read it clearly and dont get confused the functionalities. 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 simple action class will have only one method called execute. In this tutorial you will learn how to group a set of related functions into a single action using struts lookupdispatchaction. Dispatchaction class provides a mechanism for modularizing a set of related functions into a single action. Struts interview questions struts faqs jsf interview. Here in this example you will learn more about struts lookupdispatchaction that will help. Difference between dispatchaction and lookupdispatchaction. Here the program explained with the programs statistics.
An abstract action that dispatches to a public method that is named by the parameter attribute of the corresponding actionmapping. How many types of action clases are there in stuts. The method to execute on a lookupdispachaction is determined by an action itself based on the value of a specified request parameter. An abstract action that dispatches to the subclass mapped execute method.
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