Shiro+Struts2+Spring3 加上@RequiresPermissions 后@Autowired失效

2015/05/21 16:08
阅读数 41

今天一iteye网页在问答频道提问【Shiro+Struts2+Spring3 加上@RequiresPermissions 后@Autowired失效】,记录一下。

 

问题:

 

@ParentPackage("all") 
@Namespace("/project") 
public class ProjectAction extends BaseAction { 
public final static Logger logger = LoggerFactory 
.getLogger(ProjectAction.class); 

@Autowired(required=true) 
private ProjectService projectService;

 如上代码@Autowired注入不了

 

 

分析:

1、首先从如上代码可以看出 走的是struts2注解,而且使用了struts2 convention 插件,这个插件会扫描如下配置的actionPackages 寻找action

 

<filter> 
        <filter-name>struts2</filter-name> 
        <filter-classfilter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class> 
        <init-param> 
<param-name>actionPackages</param-name> 
<param-value>cn.javass</param-value> 
</init-param>

 

 

2、但此时并没有把action交给spring,

3、接下来,因为集成了spring(有struts2-spring-plugin),所以要使用StrutsSpringObjectFactory创建bean,代码分析

 

@Override 
    public Object buildBean(String beanName, Map<String, Object> extraContext, boolean injectInternal) throws Exception { 
        Object o; 
        
        if (appContext.containsBean(beanName)) { 
            o = appContext.getBean(beanName); //拿不到bean 
        } else { 
            Class beanClazz = getClassInstance(beanName); 
            o = buildBean(beanClazz, extraContext); //所以创建了一个 
        } 
        if (injectInternal) { 
            injectInternalBeans(o); 
        } 
        return o; 
    }

 

/** 
     * @param clazz 
     * @param extraContext 
     * @throws Exception 
     */ 
    @Override 
    public Object buildBean(Class clazz, Map<String, Object> extraContext) throws Exception { 
        Object bean; 

        try { 
            // Decide to follow autowire strategy or use the legacy approach which mixes injection strategies 
            if (alwaysRespectAutowireStrategy) {//默认false 
                // Leave the creation up to Spring 
                bean = autoWiringFactory.createBean(clazz, autowireStrategy, false); 
                injectApplicationContext(bean); 
                return injectInternalBeans(bean); 
            } else { 
                bean = autoWiringFactory.autowire(clazz, AutowireCapableBeanFactory.AUTOWIRE_CONSTRUCTOR, false); //只走构造器注入 
                bean = autoWiringFactory.applyBeanPostProcessorsBeforeInitialization(bean, bean.getClass().getName()); 
                // We don't need to call the init-method since one won't be registered. 
                bean = autoWiringFactory.applyBeanPostProcessorsAfterInitialization(bean, bean.getClass().getName()); 
                return autoWireBean(bean, autoWiringFactory); 
            } 
        } catch (UnsatisfiedDependencyException e) { 
            if (LOG.isErrorEnabled()) 
                LOG.error("Error building bean", e); 
            // Fall back 
            return autoWireBean(super.buildBean(clazz, extraContext), autoWiringFactory); 
        } 
    }

 

 我们在shiro里使用如下代码 去代理shiro的代理:

 

<bean id="proxyCreator" class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator"
          depends-on="lifecycleBeanPostProcessor">
        <property name="proxyTargetClass" value="true"/>
    </bean>

    <bean class="org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor">
        <property name="securityManager" ref="securityManager"/>
    </bean>

 

 

//StrutsSpringObjectFactory的如下代码将执行处理器的预处理

bean = autoWiringFactory.applyBeanPostProcessorsBeforeInitialization(bean, bean.getClass().getName());

 

//DefaultAdvisorAutoProxyCreator的postProcessBeforeInstantiation:将去完成代理bean 因此此时将返回代理Bean

 

//接着StrutsSpringObjectFactory的autoWireBean(bean, autoWiringFactory); 进行注入 所以此时注入到的是代理对象,因此如果字段注入 将注入不了。

 

 

解决方案

 

1、不使用actionPackages   而是 在类上加  @Controller @Scope 完全走spring  

2、使用setter注入 而不是字段 如 

  private ProjectService projectService; 

 

  @Autowired(required=true) 

  public void setProjectService() { 

  } 

 

 

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