This chapter will introduce you to all the results and its types used in struts 2 web application development. Struts dispatchaction can group similar action classes into a single action class having different methods. The form tags in struts 2 are used to provide the user interface and these types of tags help in making the user interface appearance in a proper and clear manner. In the deployment descriptor first setup the tiles definition file. There are a few things that need to be done in order to use json with struts 2.
We can simply integrate the struts 2 application with hibernate, spring, tiles etc. What is struts action class in java j2ee how to use java67. The view part of struts 2 is highly configurable and it supports different resulttypes such as velocity, freemarker, jsp, etc. Struts 2 actions actions are the core of the struts2 framework, as they are for any mvc model view controller framework. Basically, struts provides you with a few result types. For configuring struts 2 in your eclipse ide please refer configuring struts 2 link. The struts2 validation framework is one of the most comprehensive ones that struts 2 core is composed of. Struts 2 struts2 also comes with power apis to configure interceptors that reduce greatly the coupling in application. Hope the struts 2 team can design more userfriendly tag in future. Struts 2 provides support for both serverside and clientside validation. The parameters are same given by struts framework mapping,form,request,response.
Struts 2, param tag is a really confusing tag, many new struts 2 developers are fall into this silly trap, and wonder why a simple string setter method is not work. Some of the data tags include action, include, date, param, property, set, uri, text and many others. I am using struts2 to implement the server side processing. A lot of predefined validators and ability to create and plug in custom validators adds to the validation prowess of the framework. The reason is that input is the default result returned by struts 2 whenever there is a problem with validating the parameters passed to an action. Welcome download releases announcements license thanks. Action in action class, declared an inputstream data type and. Struts 2 in action introduces the apache struts 2 web application framework and shows you how to quickly develop professional, productionready modern web applications. In the first attack scenario, three struts result types are unsafe when used without a namespace, as defined in either in the struts configuration file or in java code if the struts convention. Apache struts 2 is an opensource web application framework for developing java ee web applications. Results and result types in struts 2 struts tutorial by. Customizestreamresult which is defined in the result annotation on the class class action. The apache struts web framework is a free opensource solution for creating java web applications.
Use the links below to download a release of apache struts from one of our mirrors. Here we use action and result annotations just to show you how to use them, for simple example like this you can use the intelligent defaults provided by the. Struts allow you to use other markup languages for the view technology to present the results and popular choices include velocity, freemaker, xslt and tiles. Heres an example that shows how to define this result type inside an element in struts. Each package may set a default result type to be used if none is specified in a result element.
Action class in struts framework is used to define the business logic it handles the client request prepare the response or tell where the response should be forward, basically its receive the data from the view layer and forward that data to specific business layer or process the data. Apache tiles is a templating framework built for the cause of the development of web application user interfaces. In this section we will download and install the struts 2. Struts2 also comes with power apis to configure interceptors that reduce greatly the coupling in application. The data tags in struts 2 help the data and display of data related work on a page. Action in action class, declared an inputstream data type and its getter method. For json, you will require a new result type, because, obviously, since the response is a json response, you dont have.
But, i am not getting how to send the result type as string and the mapping which should be done to send the string from the struts2 action class to the ajax response. This is a special form of inversion of control which is not supported in struts 1. It took a decent amount of time to figure out how to set up struts 2 with json. The action class manages the applications state, and the result type. It is available in a full distribution, or as separate library, source, example and documentation distributions. Result tag body content assist will also work in the location param tag.
Most often, results are nested with the action element. Contribute to apachestruts site development by creating an account on github. In this action excluding the execute method we can write our own user defined methods. Stream result apache struts 2 wiki apache software. In a secure application, a client might try to access a page without being authorized, and many actions may need access to a logon result.
Struts 2 provides efficient way to support file uploads. Or download some of distributions for fully offline development. There are two options with action tag, if the value for the executeresult is set to true, then the result is displayed to the page as it is defined in that target view. An action mapping will often have a set of results representing different possible. It uses and extends the java servlet api to encourage developers to adopt a modelviewcontroller mvc architecture. A struts 2 example to show the use of custom result type to allow user to download file. I want to send string as a response to the ajax xhrpost method. Easy steps to learn struts 2 difference between struts and spring apache struts 2. It will be automatically added to your manning account within 24 hours of purchase. We can restrict user to upload certain content types, certain file extensions and maximum size of files.
Struts 2 no result defined for action and result input. Struts 1 supports only one result type that is jsp while struts 2 supports many other result types like jsp, xml, velocity, freemarker etc. You will notice that in any struts 2 application, there is an action class associated with different type of client action. Result interface, ready to use in your own applications. Create dynamic web project named struts2firstproject. And the target view page will be displayed after last action. Working with struts 2 tiles, struts 2 tiles example. Result configuration apache struts apache software. The struts 2 framework can be used for specifying how the framework is to handle exceptions that. This is the method where we define the behavior of the current action. Return string result type from struts2 stack overflow.
Struts 2 action tag is helpful for executing an action and inserting the result in a particular location of the web page. Errors can be displayed on ui which is required by the user. Get more with manning an ebook copy of the previous edition, struts in action, is included at no additional cost. Redirect action result apache struts apache software. In struts 2, action class is pojo plain old java object pojo means you are not forced to implement any interface or extend any class. Unlike struts, struts 2 action class are plain pojo objects thus simplifying the testing of the code. In this chapter, we will deal with integrating the tiles framework with struts 2. The framework provides several implementations of the com.
First, we need to change or query the applications state, and then we need to present an updated view of the application. What is struts action class in java j2ee how to use. Remove the action tag and user result name as success to redirect to view page without using controller. The action class manages the applications state, and the result type manages the view. Action can be simply forwarded to one page to another view page without using controller, take a look at this simple example. The following example shows how to integrate struts 2 and tiles using the struts2 tiles plugin. No result defined for action and result input, struts2 404 error, fix for no result defined for action and result input, struts 2 input result success name. The action is responsible for executing the business logic. Each url is mapped to a specific action, which provide. In the chain result type, the target resource will be any action which is already configured in struts. It is the process of embedding an external dependency into the application component.
Struts comes with a number of predefined result types and whatever weve already seen that was the default result type dispatcher, which is used to dispatch to jsp pages. Actually tiles applications is little different than other applications we worked up to now, let us see what are the changes need to do before going to the application. Architecture of struts 2 struts 2 architecture is based on webwork 2. There are a few ways to handle exceptions in struts 2. Struts 2 provides various types of tags such as ui tags, data tags, control tags etc to ease the development of struts. The webwork framework spun off from apache struts aiming to offer enhancements and refinements while retaining the same general architecture of the original struts framework. I hope this quick solution will save someones time when working with struts 2. Very useful for allowing users to download content. Handling exceptions in a struts 2 application mr bool. Hyperlinks package tag extends attribute hyperlink. Generally, execute method should be specified that represents the business logic. Struts 2 provides interceptor to apply required constraints for file upload.
1203 1297 529 902 866 927 883 1626 969 914 329 843 562 1488 700 189 963 665 586 410 306 932 1323 1123 1400 346 1248 1625 20 8 635 380 884 1022 1325 1070 275 168