struts2--package配置

最新推荐文章于 2021-09-25 21:52:16 发布

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本文详细介绍了Struts2框架中的包配置概念，包括如何通过包来组织动作、拦截器等配置，实现继承与覆盖功能。文章还展示了具体的配置示例。

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Packages are a way to group actions, results, result types, interceptors, and interceptor-stacks into a logical configuration unit. Conceptually, packages are similiar to objects in that they can be extended and have individual parts that can be overridden by "sub" packages.

Packages

The package element has one required attribute, name, which acts as the key for later reference to the package. The extends attribute is optional and allows one package to inherit the configuration of one or more previous packages - including all interceptor, interceptor-stack, and action configurations.

Note that the configuration file is processed sequentially down the document, so the package referenced by an "extends" should be defined above the package which extends it.

The optional abstract attribute creates a base package that can omit the action configuration.(没有action定义)

Attribute	Required	Description
name	yes	key to for other packages to reference
extends	no	inherits package behavior of the package it extends
namespace	no	see Namespace Configuration
abstract	no	declares package to be abstract (no action configurations required in package)

Simple usage

Package Example (struts.xml)

 
         <struts>
        
         <
         package 
          name="employee" 
         extends
         ="struts-
         default
         " namespace="/employee">
        
         <
         default
         -interceptor-ref name="crudStack"/>
        
         <action name="list" method="list"
        
         class
         ="org.apache.struts2.showcase.action.EmployeeAction" >
        
         <result>/empmanager/listEmployees.jsp</result>
        
         <interceptor-ref name="basicStack"/>
        
         </action>
        
         <action name="edit-*" 
         class
         ="org.apache.struts2.showcase.action.EmployeeAction">
        
         <param name="empId">{
         1
         }</param>
        
         <result>/empmanager/editEmployee.jsp</result>
        
         <interceptor-ref name="crudStack">
        
         <param name="validation.excludeMethods">execute</param>
        
         </interceptor-ref>
        
         </action>
        
         <action name="save" method="save"
        
         class
         ="org.apache.struts2.showcase.action.EmployeeAction" >
        
         <result name="input">/empmanager/editEmployee.jsp</result>
        
         <result type="redirect">edit-${currentEmployee.empId}.action</result>
        
         </action>
        
         <action name="delete" method="delete"
        
         class
         ="org.apache.struts2.showcase.action.EmployeeAction" >
        
         <result name="error">/empmanager/editEmployee.jsp</result>
        
         <result type="redirect">edit-${currentEmployee.empId}.action</result>
        
         </action>
        
         </
         package
         >
        
         </struts>

Inherit from more than one package

Multi package Example (struts.xml)

 
         <struts>
        
         <
         package 
          name="employee" 
         extends
         ="struts-
         default
         , json-
         default
         " namespace="/employee">
        
         <action name="list" method="list" 
         class
         ="org.apache.struts2.showcase.action.EmployeeAction" >
        
         <result>/empmanager/listEmployees.jsp</result>
        
         <result type="json">
        
         <param name="root">employees</param>
        
         </result>
        
         </action>
        
         </
         package
         >
        
         </struts>