Illustrate the Use of JEE for Work ow in Java

Creation Quick Response Code in Java Illustrate the Use of JEE for Work ow

Illustrate the Use of JEE for Work ow
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FIGURE 4-12
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a configuration resource file. This resource file defines the action mappings for the application. These mappings are used by the Controller, turning HTTP requests into application actions. At the very least, a mapping must specify a request path as well as what object type is to act upon the request. The action object either handles the request and responds to the client (usually a web browser) or indicates that control should be forwarded to another action. Because action objects are linked to the application s Controller, they have access to that servlet s methods. When an object is forwarding control, it can indirectly forward one or more shared objects, such as JavaBeans, by putting them in a standard collection shared by Java Servlets. Most of the business logic in a Struts application can be represented using JavaBeans. In addition, JavaBeans can be used to manage input forms, eliminating the common problem with retaining and validating user input between requests. Using Struts, data can be stored in a form bean. The bean can then be saved in a shared context collection, making it accessible to other objects, especially action objects.
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4: Applicability of JEE Technology
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It could be used by a JSP to collect data, by an action object to validate user input, and then by the JSP again to repopulate the form fields. In the case of validation errors, Struts has a shared mechanism for raising and displaying error messages. Struts form beans are defined in the configuration resource and then linked to an action mapping via a common property name. When a request calls for an action that utilizes a form bean, the controller servlet will either retrieve the form bean or create one. That form bean is passed to the action object. The action object checks the contents of the form bean before its input form is displayed, queuing messages that are to be handled by the form. When the action object is ready, it can return control by forwarding to its input form, which is usually a JSP. The controller is then able to respond to the HTTP request, directing the client to the JSP. Custom tags are included within the Struts framework. They have the ability to automatically populate fields from a form bean. Most JSPs must know only the proper field names and where to submit the form. Components such as messages set by the action object can be output using a single custom tag. Application-specific tags can be defined to hide implementation details from the JSP pages. These custom tags are designed to use the Java platform internationalization features. All field labels and messages can be retrieved from a message resource, with Java automatically providing correct resources for the client s country and language. Providing messages for another language requires only the addition of another resource file. Other benefits of custom tags are consistent labeling between forms and the ability to review all labels and messages from a central location. In most applications, action objects should pass requests to other objects, primarily JavaBeans. To enable reuse on other platforms, business logic JavaBeans should not refer to any web application objects. Action objects should translate required details from the HTTP request, passing those along to business-logic beans as regular Java variables. In database applications, business-logic beans may connect to and query the database, returning the result set to the action s servlet, where it is stored in a form bean and then displayed by the JSP.
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The Model
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The Model in an MVC-based application can be divided into two parts: the internal state of the system and the actions that can be taken to alter that state. A web application using the Struts framework typically represents the internal state of the system as a set of one or more JavaBeans with properties that represent the details of that state. These beans may be self-contained and able to save their
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