Action mappings are configured in the configuration file struts-config.xml under the tag <action-mapping> as follows:
[xml]
<pre><action-mappings>
<action path=”/login”
type=”login.loginAction”
name=”loginForm”
input=”/login.jsp”
scope=”request”
validate=”true”>
<forward name=”success” path=”/index.jsp”/>
<forward name=”failure” path=”/login_error.jsp”/>
</action>
</action-mappings>
[/xml]
Struts should be used when any or some of the following conditions are true:
A highly robust enterprise level application development is required.
A reusable, highly configurable application is required.
A loosely coupled, MVC based application is required with clear segregation of different layers.
In Struts framework, actionServlet acts as a controller and all the requests made by users are controlled by this controller. ActionServlet is based on singleton design patter as only one object needs to be created for this controller class. Multiple threads are created later for each user request.
Following Steps are required to setup validator framework in Struts: –
In WEB-INF directory place valdator-rules.xml and validation.xml files.
Enable validation plugin in struts-config.xml files by adding following:
[xml]
<plug-in className=”org.apache.struts.validator.ValidatorPlugIn”>
<set-property property=”pathnames” value=”/WEB-INF/validator-rules.xml,
/WEB-INF/validation.xml”/>
</plug-in>
[/xml]
In Struts, we can use any of the following technologies in view layer:
JSP
HTML
XML/XSLT
WML Files
Velocity Templates
Servlets
