With Struts 1. What are the classes used in struts? What is strut Web XML? What is struts2 framework? What is interceptor struts2? Are struts outdated? How do you use struts? What is the difference between a strut and a shock absorber?
What is the latest version of Struts framework? Prior Releases. What are construction struts? Architecture and construction. What is strut action mapping? What is form bean in struts? Which pattern is the Struts framework based?
Struts2 with I18N. Zero Configuration. By convention By annotation. Struts2 with Tiles2. Hibernate with Struts2. Spring with Struts2. DateTimePicker Iterator Tag. Struts 2 Configuration File Elements of struts. Reinforcement Learning. R Programming. React Native. Python Design Patterns.
Python Pillow. Python Turtle. Verbal Ability. Interview Questions. Objects using value inject must define the the static attribute. They specify which Bean should be chosen, among multiple implementations of a given type.
Constants can be declared in multiple files. By default, constants are searched for in the following order, allowing for subsequent files to override by the previous ones:.
In the struts. In the web. In the various XML variants, the constant element has two required attributes : name and value. Toggle navigation. Home Struts Struts2 Struts Configuration file - struts. Tutorials Login form in Struts2 version 2. Download Struts 2. Struts Configuration file - struts. In this section we will introduce you with the struts. These resources include: Interceptors that can preprocess and postprocess a request Action classes that can call business logic and data access code Results that can prepare views using JavaServer Pages, Velocity and FreeMarker templates At runtime, there is a single configuration for an application.
Features of struts 2 configuration file: The struts. This value may consist of any combination of the following:. Set to true if you want the input parameters of action elements to be the names of local or global forward elements used to calculate the ultimate URLs. Set to false the default to treat the input parameters of action elements as module-relative paths to the resources used for the input form.
This attribute is not required; the default value is true. The maximum size in bytes of a file to be accepted as a file upload. This attribute is not required; the default value is M.
The maximum size in bytes of a file whose contents will be retained in memory after uploading. Files larger than this threshold will be written to some alternative storage medium, typically a hard disk. The default value is K. The fully qualified Java class name of the multipart request-handler class to be used. This attribute is not required; the default value is the CommonsMultipartRequestHandler class in the org.
A replacement pattern defining how the page attributes of custom tags using it are mapped to context-relative URLs of the corresponding resources. The fully qualified Java class name of the request-processor class to be used to process requests. The value specified here should be a descendant of org. RequestProcessor , which is the default value. Specifies the temporary working directory that is used when processing file uploads.
This attribute is not required; the servlet container will assign a default value for each web application. ControllerConfig class is used to represent the information configured in the controller element in memory. The following fragment shows an example of how to configure the controller element:. The message-resources element specifies characteristics of the message resource bundles that contain the localized messages for an application.
Each Struts configuration file can define one or more message resource bundles; therefore, each module can define its own bundles. The message-resources element contains only a set-property element:. Table lists the attributes supported by the message-resources element.
The implementation class of the configuration bean that will hold the message-resources information. MessageResourcesConfig , which is the default class when no value is specified. The fully qualified Java class name of the MessageResourcesFactory class that should be used.
The PropertyMessageResources class of the package org. The servlet context attribute with which this message resource bundle will be stored. The default value is specified by the string constant Globals. Only one resource bundle can be the default bundle. A Boolean value indicating how the MessageResources subclass should handle the case when an unknown message key is used. If this value is set to true , an empty string will be returned.
If set to false , a message that looks something like "??? The actual message will contain the bad key. The default value is true. The base name of the resource bundle. For example, if the name of your resource bundle is ApplicationResources. If your resource bundle is within a package, you must provide the fully qualified name in this attribute.
The following example shows how to configure multiple message-resources elements for a single application. Notice that the second element had to specify the key attribute, because only one can be stored with the default key:. The concept of a plug-in was added in Struts 1. This powerful feature allows your Struts applications to discover resources dynamically at startup. To use a plug-in, create a Java class that implements the org. PlugIn interface and add a plug-in element to the configuration file.
The PlugIn mechanism itself will be discussed further in Chapter 9. The plug-in element specifies a fully qualified class name of a general-purpose application plug-in module that receives notification of application startup and shutdown events.
An instance of the specified class is created for each element; the init method is called when the application is started, and the destroy method is called when the application is stopped. The class specified here must implement the org. PlugIn interface and implement the init and destroy methods. The plug-in element may contain zero or more set-property elements, so that extra configuration information may be passed to your PlugIn class:. The allowed attribute for the plug-in element is shown in Table 2.
The fully qualified Java class name of the PlugIn class. It must implement the PlugIn interface. The ValidatorPlugIn shown in the second plug-in element displays how the Struts framework initializes the Validator. The Validator framework is discussed in Chapter Example provides a complete listing. With Struts 1. Although the application modules are part of the same web application, they act independently of one another.
You also can switch back and forth between application modules if you like. Using multiple application modules allows for better organization of the components within a web application. For example, you can assemble and configure one application module for everything that deals with catalogs and items, while another module can be organized with the configuration information for a shopping cart and ordering. Separating an application into components in this way facilitates parallel development.
The first step is to create the additional Struts configuration files. Suppose we created a second configuration file named struts-order-config. We must modify the web. Example shows the servlet instance mapping from before with an additional init-param for the second Struts configuration file. Example A partial web. With the current version of the Struts framework, only extension mapping is supported when using multiple application modules.
Path mapping is not yet supported. Pay special attention to the configuration attributes available in the various Struts XML elements. Some of them, as mentioned in this chapter, have a profound effect on how an application operates in a multiapplication module environment. To ensure that your Struts configuration file is valid, it can and should be validated against the Struts DTD.
This is no longer the case, as Struts now provides local copies of the DTDs. This allows you to specify an absolute path instead of a relative one. Although this may solve a short-term problem, it creates more long-term ones. You probably are better off not using it. However, if you decide that you need to do so, it should look something like the following:.
As you can see, the location of the DTD is an absolute path. This is why this approach is not recommended. Skip to main content. Programming Jakarta Struts, Second Edition by.
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