[英]how to delegate struts2 action's instantiation to spring using annotations
您好我有一個Struts2應用程序,其中struts操作在struts.xml
文件中定義。 現在,我想將此委托給Spring,以便對會話范圍進行操作。
情況1:如果我使用注解@Repository("myAction")
我總是得到錯誤:無法實例化在命名空間/omb
doAction
為doAction
定義的Action
, myAction
情況2:如果我使用applicationContext.xml
,我在myService.callMethode();
上有一個NullPointerException
myService.callMethode();
我怎么能用注釋做到這一點? 因為重新定義applicationContext.xml
所有服務將太長
struts.xml
:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.devMode" value="false" />
<constant name="struts.action.extension" value="do" />
<constant name="struts.custom.i18n.resources" value="com.omb.i18n.StrutsResourceBundle" />
<constant name="struts.objectFactory" value="org.apache.struts2.spring.StrutsSpringObjectFactory" />
<constant name="struts.objectFactory.spring.autoWire" value="name" />
<constant name="struts.i18n.encoding" value="ISO-8859-1" />
<constant name="struts.i18n.reload" value="false" />
<constant name="struts.configuration.xml.reload" value="false" />
<constant name="struts.locale" value="fr" />
<constant name="struts.multipart.maxSize" value="100000000000" />
<constant name="struts.enable.SlashesInActionNames" value="true" />
<constant name="struts.mapper.alwaysSelectFullNamespace" value="false"/>
<constant name="struts.codebehind.classSuffix" value="Controller"/>
<constant name="struts.codebehind.action.checkImplementsAction" value="false"/>
<constant name="struts.codebehind.action.checkAnnotation" value="false"/>
<constant name="struts.codebehind.action.defaultMethodName" value="index"/>
<constant name="struts.configuration.classpath.defaultParentPackage" value="rest-default" />
<package name="default" extends="tiles-default" namespace="/">
<interceptors>
<interceptor name="params-filter"
class="com.opensymphony.xwork2.interceptor.ParameterFilterInterceptor" />
<interceptor-stack name="defaultStack">
<interceptor-ref name="exception" />
<interceptor-ref name="alias" />
<interceptor-ref name="servletConfig" />
<interceptor-ref name="i18n" />
<interceptor-ref name="chain" />
<interceptor-ref name="modelDriven" />
<interceptor-ref name="fileUpload">
<param name="maximumSize">11204928</param>
</interceptor-ref>
<interceptor-ref name="staticParams" />
<interceptor-ref name="conversionError" />
<interceptor-ref name="params" />
<interceptor-ref name="prepare" />
<interceptor-ref name="validation" />
<interceptor-ref name="workflow" />
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="defaultStack" />
<global-results>
<result name="technicalError" type="chain">
errorAction
</result>
<result name="sessionInvalidError" type="tiles">
sessionInvalid
</result>
<result name="blank" type="tiles">blank</result>
</global-results>
<global-exception-mappings>
<exception-mapping exception="java.lang.Exception"
result="technicalError" />
<exception-mapping
exception="com.omb.service.exception.UserSessionInvalidException"
result="sessionInvalidError" />
</global-exception-mappings>
</package>
<package name="omb" extends="default" namespace="/omb">
<action name="doAction.do" class="myAction" method="{1}">
<result name="success" type="redirectAction">
<param name="namespace">/omb</param>
<param name="actionName">displayResult</param>
</result>
<result name="error" type="redirectAction">
<param name="namespace">/error</param>
<param name="actionName">displayError</param>
</result>
</action>
</package>
</struts>
web.xml
:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>MyApplication</display-name>
<description>Application OMB</description>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:applicationContext.xml,
classpath:applicationContext-web.xml
</param-value>
</context-param>
<context-param>
<param-name>org.apache.tiles.DEFINITIONS_CONFIG</param-name>
<param-value>/WEB-INF/tiles/tiles-defs.xml</param-value>
</context-param>
<context-param>
<param-name>struts.ajax.debug</param-name>
<param-value>${struts.ajax.debug}</param-value>
</context-param>
<filter>
<filter-name>Acegi Filter Chain Proxy</filter-name>
<filter-class>
org.acegisecurity.util.FilterToBeanProxy
</filter-class>
<init-param>
<param-name>targetClass</param-name>
<param-value>
org.acegisecurity.util.FilterChainProxy
</param-value>
</init-param>
</filter>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>Acegi Filter Chain Proxy</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Java Melody filter mapping -->
<filter-mapping>
<filter-name>monitoring</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>
com.omb.listener.ApplicationListener
</listener-class>
</listener>
<listener>
<listener-class>
org.apache.struts2.tiles.StrutsTilesListener
</listener-class>
</listener>
<!-- listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener-->
<listener>
<listener-class>
org.springframework.web.context.request.RequestContextListener
</listener-class>
</listener>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
MyAction.java
:
package com.omb.actions;
@Repository("myAction")
@Scope("session")
public class MyAction extends ActionSupport {
@Qualifier("myService")
private MyService myService;
public String execute() throws Exception {
myService.callMethode();
return SUCCESS;
}
public MyService getMyService() {
return this.myService;
}
public void setMyService(MyService myService) {
this.myService = myService;
}
}
如果您正在使用Spring插件,那么struts與spring的集成是成功的,struts的objectFactory
將操作的構建委托給spring,因此它可以用來從spring應用程序上下文中注入依賴項。 但是動作bean由struts容器管理,所以它在內部保留了DI的可能性。 如果要完全委托要由spring管理的bean,則應在應用程序上下文中配置操作bean,並在操作配置中替換對spring ID的類引用。
在applicationContext.xml
<!--<context:annotation-config/>-->
<context:component-scan base-package="your.base.package"/>
指向spring以掃描包層次結構中的bean。
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