Spring AOP 针对注解的AOP

我也忘记是从哪里扒来的代码，不过有了这个思路，以后可以自己针对 Controller 还有 Service层的任意 方法进行代理了

package pw.jonwinters.aop;

import java.lang.annotation.*;

/**

 *自定义注解 拦截Controller

 */

@Target({ElementType.PARAMETER, ElementType.METHOD})

@Retention(RetentionPolicy.RUNTIME)

@Documented

public  @interface SystemControllerLog {

    String description()  default "";

}    

package pw.jonwinters.aop;

import java.lang.annotation.Documented;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

@Target({ElementType.PARAMETER, ElementType.METHOD})

@Retention(RetentionPolicy.RUNTIME)

@Documented

public @interface SystemServiceLog {

    String description()  default "";

}

package pw.jonwinters.aop;

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.beans.factory.annotation.Qualifier;

import org.springframework.stereotype.Component;

import org.springframework.web.context.request.RequestContextHolder;

import org.springframework.web.context.request.ServletRequestAttributes;

import java.lang.reflect.Method;

import javax.servlet.http.HttpServletRequest;

import pw.jonwinters.service.*;

@Aspect

@Component

public class SystemLogAspect {

    @Autowired

    @Qualifier("baseLogger")

    private Logger log;

     @Pointcut("@annotation(pw.jonwinters.aop.SystemServiceLog)")    //拦截带有此类注解的方法

     public  void serviceAspect() {

    }

     @Pointcut("@annotation(pw.jonwinters.aop.SystemControllerLog)")

     public  void controllerAspect() {

    }

     @Before("controllerAspect()")

     public  void doBefore(JoinPoint joinPoint) throws Throwable {  //joinPoint

         log.info("aop is running!");

         log.info("请求方法:" + (joinPoint.getTarget().getClass().getName() + "." + joinPoint.getSignature().getName() + "()"));

         log.info("方法描述:" + getControllerMethodDescription(joinPoint));

            //请求的IP

         Thread.sleep(20000);

         HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();

            String ip = request.getRemoteAddr();

             try {

                //*========控制台输出=========*//

                log.info("=====前置通知开始=====");

                log.info("请求方法:" + (joinPoint.getTarget().getClass().getName() + "." + joinPoint.getSignature().getName() + "()"));

                log.info("方法描述:" + getControllerMethodDescription(joinPoint));

                log.info("请求IP:" + ip);

               // Thread.sleep(2000);

             }

             finally{

             }

        }

     @AfterThrowing(pointcut = "serviceAspect()", throwing = "e")

     public  void doAfterThrowing(JoinPoint joinPoint, Throwable e) {

     }

}    

public  static String getControllerMethodDescription(JoinPoint joinPoint)  throws Exception {

        String targetName = joinPoint.getTarget().getClass().getName();    //这是个工具类， 通过joinPoint对象 获得目标对象的引用 获得拦截对象的Class对象，然后获得Class对象的名称

        String methodName = joinPoint.getSignature().getName();  //获得拦截方法的名称

        Object[] arguments = joinPoint.getArgs();   //获得拦截方法的参数对象数组

        Class<?> targetClass = Class.forName(targetName);  //获得拦截对象的Class

        Method[] methods = targetClass.getMethods();  //获得拦截对象的所有方法

        String description = "";

         for (Method method : methods) {    //遍历方法

             if (method.getName().equals(methodName)) { //当此方法的名称与拦截方法的名称相同时候

                Class[] clazzs = method.getParameterTypes();   //获得这个方法的所有参数类型的 Class对象

                 if (clazzs.length == arguments.length) {  //确保拦截的方法的参数个数 与 解析到的参数个数相同

                    description = method.getAnnotation(SystemControllerLog.class).description();    //然后获得方法的注解的description字段的值 并且返回

                     break;

                }

            }

        }

         return description;

    }