Spring mvc Spring MVC中未在Aspect中注入自连线依赖项

我无法在Aspect中

@Autowire

服务层实例。在方面中，对

@Autowired

bean的引用为NULL，它抛出

NullPointerException

。任何帮助都将不胜感激。我想，我把配置搞砸了

以下是我的

servlet context.xml

：

<!-- Activates various annotations to be detected in bean classes -->
<context:annotation-config />
<context:spring-configured />       

<!-- Scans the classpath of this application for @Components to deploy as beans -->
<context:component-scan base-package="xx.yy" />

<!--  an @AspectJ aspect will be interpreted as an aspect by Spring AOP and beans in the context will be advised accordingly -->
<aop:aspectj-autoproxy />

<beans:bean id="loggingAspect" class="xx.yy.aop.aspects.LoggingAspect" />
<beans:bean id="authenticationAspect" class="xx.yy.aop.aspects.AuthenticationAspect" />

<!-- Enables the Spring MVC @Controller programming model -->
<annotation-driven />

这是我的控制器，它使用了上面定义的

@Authentication

注释：

@Controller
@RequestMapping("/user")
public class UsersController {

@Autowired
private UserService userService;

@Authenticate
@RequestMapping(value="/{userId}/profile", method=RequestMethod.GET)    
public String displayUser(WebRequest webRequest, @PathVariable("userId") String userId, Model model) {
    User user = userService.findUser(Long.valueOf(userId));  
    model.addAttribute("user", user);
    model.addAttribute("AccordionMenuTab","5");
    model.addAttribute("selectedLink","profile");
    return "profile";
}

我得到以下例外情况：

Oct 8, 2011 3:12:48 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet appServlet threw exception
java.lang.NullPointerException
    at xx.yy.controller.UsersController.displayUser_aroundBody1$advice(UsersController.java:28)
    at xx.yy.controller.UsersController.displayUser(UsersController.java:1)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Thread.java:662)

见：

7.8.3使用Spring IoC配置AspectJ方面

当在Spring应用程序中使用AspectJ方面时，很自然地希望和期望能够使用Spring配置这些方面。AspectJ运行时本身负责方面的创建，通过Spring配置AspectJ创建的方面的方法取决于方面使用的AspectJ实例化模型（“per xxx”子句）

大多数AspectJ方面都是单例方面。这些方面的配置非常简单：只需创建一个引用方面类型的bean定义，并包含bean属性'factory method=“aspectOf”'。这确保了Spring通过向AspectJ请求方面实例而不是试图自己创建实例来获得方面实例。例如：

---

对于任何想要基于java的bean配置的人，使用java反射，我可以存档相同的配置

@Bean
public ExceptionAspectHandler exceptionAspectHandler(){
    try
    {
        //noinspection JavaReflectionMemberAccess
        Method method = ExceptionAspectHandler.class.getMethod("aspectOf" );
        return (ExceptionAspectHandler) method.invoke(null);
    }
    catch( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
    {
       logger.log( Level.SEVERE, "Error creating bean : ", e );
    }
    return null;
}

由于

aspectOf（）

方法在编译时不可用，因此我们不能仅通过调用该方法来创建bean。这就是XML配置能够处理它的原因

或者更简单的方法

@Bean
public ExceptionAspectHandler exceptionAspectHandler()
{
    return Aspects.aspectOf( ExceptionAspectHandler.class );
}

---

这也行。

文档很庞大，但却是最重要的。添加factory method=“aspectOf”解决了我的问题，谢谢！！您好，您知道如何转换为java配置吗？

@Bean
public ExceptionAspectHandler exceptionAspectHandler(){
    try
    {
        //noinspection JavaReflectionMemberAccess
        Method method = ExceptionAspectHandler.class.getMethod("aspectOf" );
        return (ExceptionAspectHandler) method.invoke(null);
    }
    catch( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
    {
       logger.log( Level.SEVERE, "Error creating bean : ", e );
    }
    return null;
}

@Bean
public ExceptionAspectHandler exceptionAspectHandler()
{
    return Aspects.aspectOf( ExceptionAspectHandler.class );
}