What is Struts Frame Work Architecture(With Diagram) ?
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Model Components
Model components provide a "model" of the business logic or
data behind a Struts program. For example, in a Struts
application that manages customer information, it may be
appropriate to have a "Customer" Model component that
provides program access to information about customers.
It's very common for Model components to provide interfaces
to databases or back-end systems. For example, if a Struts
application needs to access employee information that is
kept in an enterprise HR information system, it might be
appropriate to design an "Employee" Model component that
acts as an interface between the Struts application and the
HR information system.
Model components are generally standard Java classes. There
is no specifically required format for a Model component,
so it may be possible to reuse Java code written for other
projects.
View Components
View components are those pieces of an application that
present information to users and accept input. In Struts
applications, these correspond to Web pages.
View components are used to display the information
provided by Model components. For example, the "Customer"
Model component discussed above would need a View component
to display its information. Usually, there will one or more
View components for each Web page in a Struts application.
View components are generally built using JavaServer Page
(JSP) files. Struts provides a large number of "JSP Custom
Tags" (sometimes referred to as Struts Tags) which extend
the normal capabilities of JSP and simplify the development
of View components.
Controller Components
Controller components coordinate activities in the
application. This may mean taking data from the user and
updating a database through a Model component, or it may
mean detecting an error condition with a back-end system
and directing the user through special error processing.
Controller components accept data from the users, decide
which Model components need to be updated, and then decide
which View component needs to be called to display the
results.
One of the major contributions of Controller components is
that they allow the developer to remove much of the error
handling logic from the JSP pages in their application.
(After all, if errors in processing occur, the Controller
component forwards to an error-processing View component,
not the primary results View component.) This can
significantly simplify the logic in the pages and make them
easier to develop and maintain.
Controller components in Struts are Java classes and must
be built using specific rules. They are usually referred to
as "Action classes."
I unable to draw here........hope this will help you
| Is This Answer Correct ? | 17 Yes | 8 No |
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1.Which of the following can be performed using interceptors by the developer? 1. Provide pre-processing logic before invoking the action 2. Interact with the action and set the request parameter on the action 3. Provide post-processing logic after invoking the action 4. Modify the result 1, 2, 3 2, 3, 4 1, 2, 4 1, 2, 3, 4 2.Interceptors can be used for which of the following tasks? 1. Checking security and bottleneck 2. Tracing the log 3. Validating user input 4. Uploading file 1, 2, 3 2, 3, 4 1, 2, 4 1, 2, 3, 4 3.The ValueStack is made up of which of the following objects? 1. Temporary Objects 2. Model Object 3. Action Object 4. Permanent Object 1, 2, 3 2, 3, 4 1, 2, 4 1, 2, 3, 4 4.Which of the following statements are correct? Apache Struts is a Java based framework that separates the application logic from the presentation layer. Action is based on pull-MVC framework which means that the data to be displayed is pulled from the action class which is a POJO class acting as a model in the Web application. OGNL is a powerful expression language that allows you to refer and manipulate the data present on the ValueStack. Declarative architecture enables you to integrate the different components present in the Web application either using XML files or Annotations. 5.Which of the following are the examples of helpers? 1. Action Interface 2. ActionSupport Class 3. ActionImplement Interface 1, 2 2, 3 1, 3 1, 2, 3 6.The Struts 2 filter performs which of the following tasks? 1. Installation of the Action class 2. Execution of the method specified in the configuration file 3. Reading of the control string 1, 2 2, 3 1, 3 1, 2, 3 7.Which of the following value for the debug parameter displays an OGNL console to test OGNL expressions against the value stack? xml console command All of the above. 8.Which of the following are correct statements? The execute () method of the action class defines business logic implementations. ActionSupport class adds useful utilities to the class that extends it. Set of Interceptors are grouped into a stack known as Interceptor Stack. All of the above. 9.Which of the following annotation helps to set the path of the action URL? It is placed before the action class and it applies to all actions defined in the class, even if the fully qualified URLs are not supplied. @Namespace @Result @Results @ParentPackage 10.Which of the following statements are correct related to OGNL and Annotations? OGNL is an expression and binding language that is used for getting and setting the properties of the Java objects. Annotations acts as an alternative to HTML and Java properties configuration file. Action Annotations are available when the framework scans the classpath for action classes. Lifecycle callback annotations are invoked at any time during the processing of an action. 11.Which of the following are the features of the new unified Expression Language? Deferred evaluation of expression Support expressions that can set values and invoke methods Provides a pluggable API for resolving expressions All of the above. 12.By introducing the new feature by JSF, improvements have been made in which of the following areas? Set of standard converter messages Addition of requiredMessage, converterMessage, and validatorMessage attribute for input components. Displaying the error message using the input component name with the help of label attribute added to the input components All of the above. 13.Which of the following statements are correct about the 'label' attribute? In JSF 2.1, the label attribute have been introduced with the input components. The label attribute can accept literal or value expressions. The Literal or value expressions accepted by label attribute is prefixed before the components error message. All of the above. 14.Which of the following statements are correct? EL allows developers to use simple expressions to dynamically access data from JavaBeans components. EL supports only deferred evaluation. A value expression can either yield a value or set a value and can be used for both read and write. In immediate evaluation, the expression is evaluated immediately. 15.Which of the following statements are correct? Method expression invokes as arbitrary private method of an arbitrary object by passing a specified set of parameters and returning results from the calling method. JSTL is a part of Java EE 5 platform. JSF 1.2 includes a set of messages for standard converters. The requiredMessage, converterMessage, or the validatorMessage attribute of the input components are used to provide custom error messages.
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In struts.xml, what does the attribute "method" stands for in the "action" tag?
How does struts work?
Core Java 
