java - Spring MVC 与 AspectJ

Question

我有一个正在运行的 spring mvc 项目。我想使用 AspectJ 通过我的 Controller 记录每个请求。相关代码:

Controller :(在 hu.freetime.controller 包中)

@Controller
@RequestMapping("/")
public class BaseControllerImpl {
    @RequestMapping(method = RequestMethod.GET)
    public String index(Model model) {
        return "index";
    }
}

方面:

@Aspect
public class ControllerAspectImpl {
    Logger logger = LoggerFactory.getLogger(ControllerAspectImpl.class);

    @Pointcut("execution(public * hu.freetime.controller.BaseControllerImpl.*(..))")
    public void logController() {
    }


    @Around("logController()")
    public void log(final ProceedingJoinPoint pjp) {
        MethodSignature signature = (MethodSignature) pjp.getSignature();
        Method method = signature.getMethod();
        logger.info("Calling Controller method: " + method.getName() + "()");
        try {
            pjp.proceed();
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }
}

WebAppInitializer:

public class CashflowWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class<?>[] { RootConfig.class };
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class<?>[] { WebConfig.class };
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }
}

WebConfig 类:

@Configuration
@EnableWebMvc
@EnableAspectJAutoProxy
@ComponentScan(basePackages = { "hu.freetime.controller", "hu.freetime.aspect" })
public class WebConfig extends WebMvcConfigurerAdapter {

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setExposeContextBeansAsAttributes(true);
        return resolver;
    }

    @Bean
    public ControllerAspectImpl getControllerAspect() {
        return new ControllerAspectImpl();
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
}

问题是，这两个组件中只有一个在工作。如果我“关闭”AOP，MVC 工作得很好，但是当我“打开”并且我想转到主页时，我收到此错误:

HTTP Status 404 - .../WEB-INF/views/.jsp
The requested resource is not available.

奇怪的是，它想要映射“.jsp”而不是“index.jsp”，正如我在 Controller 的index()方法中所写的那样。我在运行时调试，它确实停在 Controller 方法处。

我怎样才能让它发挥作用？

Answer 1

您的周围建议不会返回 pjp.proceed() 的结果。这是建议方法的返回值，并且必须由建议返回!否则您也会将建议方法变成无效。

public **Object** log(final ProceedingJoinPoint pjp) {
...
    try {
        **return** pjp.proceed(); <<< !
    } catch (Throwable e) {
        e.printStackTrace();
    }    
}