spring aop拦截自定义注解的切入点表达式

来源：互联网发布：java知识点重点和难点编辑：程序博客网时间：2024/05/16 18:00

@within(com.cxh.study.aop.controller.UserAccessAnnotation)
表示拦截含有com.cxh.study.aop.controller.UserAccessAnnotation这个注解的类中所有方法

@annotation(com.cxh.study.aop.controller.UserAccessAnnotation)
表示拦截含有这个注解的方法

注意:如果在方法参数上需要该注解,则在表达式中不写类名,而是写参数名; 如果拦截的方法上有注解,则可以直接在方法上加入参数就可以取得,如果注解在Class上则需要使用ProceedingJoinPoint通过反射取得注解

示例

package com.cxh.study.aop.controller;import org.apache.commons.logging.LogFactory;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.*;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;/** * Created by Jackie on 2015/4/20. * Email : cxh5060@163.com */@Aspect@Componentpublic class LoginInterceptor {    /**     * A Join Point is defined in the action layer where the method needs     * a permission check.     */    @Autowired    private HttpServletRequest httpServletRequest;    @Pointcut("@annotation(com.cxh.study.aop.controller.UserAccessAnnotation)")    public void userAccess() {}    /**     * 这里需要取得userAccessAnnotation,     * 如果注解是在方法上,可以得到,如果注解在类上则为null     * @param proceedingJoinPoint     * @param userAccessAnnotation     * @throws Throwable     */    @Around(value = "@within(userAccessAnnotation) || " +            "@annotation(userAccessAnnotation)")    public void beforeMethod(ProceedingJoinPoint proceedingJoinPoint, UserAccessAnnotation userAccessAnnotation)  throws Throwable{        System.out.println("method starts");        proceedingJoinPoint.proceed(proceedingJoinPoint.getArgs());        proceedingJoinPoint.getTarget().getClass();    }    /**     * 这里不需要取得userAccessAnnotation     * @param proceedingJoinPoint     * @throws Throwable     */    @Around(value = "@within(com.cxh.study.aop.controller.UserAccessAnnotation) || " +            "@annotation(com.cxh.study.aop.controller.UserAccessAnnotation)")    public void beforeMethod1(ProceedingJoinPoint proceedingJoinPoint)  throws Throwable{        System.out.println("method starts");        proceedingJoinPoint.proceed(proceedingJoinPoint.getArgs());        proceedingJoinPoint.getTarget().getClass();    }    @AfterReturning("userAccess()")    public void afterMethod(){        System.out.println("method  ends");    }    @Before(value = "@within(com.cxh.study.aop.controller.UserAccessAnnotation) || @annotation(com.cxh.study.aop.controller.UserAccessAnnotation)")    public void before(JoinPoint joinPoint) throws Throwable {        LogFactory.getLog(this.getClass()).info("monitor.before, class: " + joinPoint.getSignature().getDeclaringType().getSimpleName() + ", method: " + joinPoint.getSignature().getName());    }    @After(value = "@within(com.cxh.study.aop.controller.UserAccessAnnotation) || @annotation(com.cxh.study.aop.controller.UserAccessAnnotation)")    public void after(JoinPoint joinPoint) throws Throwable {        LogFactory.getLog(this.getClass()).info("monitor.after, class: " + joinPoint.getSignature().getDeclaringType().getSimpleName() + ", method: " + joinPoint.getSignature().getName());    }}

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