What is the class used in Struts 2 for a filter as defined in Web xml?

What is the class used in Struts 2 for a filter as defined in Web xml?

In the web. xml file, Struts defines its FilterDispatcher, the Servlet Filter class that initializes the Struts framework and handles all requests.

What is filter dispatcher in struts?

1. 3. FilterDispatcher was the filter that was provided by Struts 2 for handling all request which needs to be controlled by struts framework. After Struts 2.1. 3 use of this filter was deprecated.

Which tag is used to configure Frontcontroller filter in Struts 2 framework?

In Struts 2 a filter called FilterDispatcher is used as the Front Controller. To use the FilterDispatcher it has to be registered in the deployment descriptor (web. xml) as below.

Which of the following are elements of Struts configuration?

The configuration file basically contains three main elements:

What is Struts2 basic flow?

Struts 2 standard flow (Struts 2 architecture) Container invokes the controller (StrutsPrepareAndExecuteFilter or FilterDispatcher). Since struts2. ActionProxy gets the information of action and interceptor stack from the configuration manager which gets the information from the struts. xml file.

What is action name Struts 2?

Struts 2 “action” tag is used to call action class directly from a JSP page. if the “executeResult” attribute is set to true, the content of the result page will be rendered directly in the current page.

Which config files are used in struts?

The struts application contains two main configuration files struts. xml file and struts. properties file. The struts.

What is filterfilter in Struts 2 framework?

Filter is a part of Servlet API so Struts 2 Framework uses the concept of Interceptors to share the solution for some common concerns by different actions. Also you can easily write test cases for Interceptor and Action class.

Should I use interceptors or filters in Struts 2?

If you are using Struts 2, you should use interceptors for wrapping functionality around your Struts 2 actions. If you are trying to wrap functionality around requests coming to your webapp, but not being handled by Struts 2, then a filter might be more appropriate.

How does the FilterDispatcher work in struts?

The request is first sent from the browser to the server. Then the server loads the web.xml and if the request pattern matches then it is forwarded to the FilterDispatcher. In struts 2 the FilterDispatcher is the Front Controller. Based on the request url and it’s mapping in the struts.xml the appropriate action class to be executed is decided.

How to deploy the entire Struts 2 framework?

BTW, the entire Struts 2 Framework is deployed inside a filter configured in your web app, declared in your webapp’s deployment descriptor ( web.xml ) like: This filter, which is configured to catch all requests URL patterns, is the entry point into the entire Struts 2 framework.

Can we have multiple filters in Web xml?

Multiple filters associated with a web resource are executed in the order of tag, which is specified in the deployment descriptor file(web. xml).

What is struts-config xml and its use?

The controller servlet uses a struts-config. xml file to map incoming requests to Struts Action objects, and instantiate any ActionForm objects associated with the action to temporarily store form data. The Action object processes requests using its execute method, while making use of any data stored in the form bean.

How do I read struts-config xml?

The struts-config. xml configuration file is a link between the View and Model components in the Web Client. It plays an important role in building both Controller components and Application-specific configurations. In Web NMS, this file is created specific to every application in the format as -struts-config.

What is Struts xml?

xml File. The struts. xml file contains the configuration information that you will be modifying as actions are developed. This file can be used to override default settings for an application, for example struts. devMode = false and other settings which are defined in property file.

How do I register a filter in Web xml?

Configuring a Filter

  1. Open the web. xml deployment descriptor in a text editor or use the Administration Console.
  2. Add a filter declaration.
  3. Specify one or more initialization attributes inside a element.
  4. Add filter mappings.
  5. To create a chain of filters, specify multiple filter mappings.

What are filters in Web xml?

2 Answers. It allows you to declare servlet filters, which are aspects for HTTP requests. A filter chain can intercept an incoming request and/or an outgoing response and modify it as needed. A common example is to have a filter that performs a GZIP compression on a response stream if the user’s browser can accept it.

How can we configure the Web xml file for Struts?

How to configure Struts framework in web. xml

  1. – Define Struts action servlet and its initialization parameters.
  2. – Specify servlet mapping for the action servlet.
  3. – Declaration of the filter dispatcher.
  4. – URL mapping for the filter dispatcher.

What is Struts-config xml and its use?

How to configure web XML for struts?

Configuring web.xml for the framework is a matter of adding a filter and filter-mapping. Filter Example (web.xml) As from Struts 2.5 all filters were moved to top package, if you are using older version you must use the old package, see example:

Do I need a taglib for filtering in struts?

Since Struts 2.1.7, you are able to provide a comma separated list of patterns for which when matching against the request URL the Filter will just pass by. This is done via the configuration option struts.action.excludePattern, for example in your struts.xml: Typically, configuring a taglib is neither required nor recommended.

What is the use of Struts2 configuration file?

It is not strictly a Struts2 configuration file, but it is a file that needs to be configured for Struts2 to work. As discussed earlier, this file provides an entry point for any web application. The entry point of Struts2 application will be a filter defined in deployment descriptor (web.xml).

What is Web Application Descriptor in struts?

The web.xml web application descriptor file represents the core of the Java web application, so it is appropriate that it is also part of the core of the Struts framework. In the web.xml file, Struts defines its FilterDispatcher, the Servlet Filter class that initializes the Struts framework and handles all requests.