aop 初探

1、首先是配置文件：

上图是让aop配置正确，不报红；

完整代码：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"

       xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:cache="http://www.springframework.org/schema/cache"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-4.0.xsd
		http://www.springframework.org/schema/mvc
		http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
		http://www.springframework.org/schema/aop
		http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
		http://www.springframework.org/schema/cache
		http://www.springframework.org/schema/cache/spring-cache.xsd">

    <description>Spring MVC Configuration</description>

    <!-- 启用spring mvc 注解 -->
    <context:annotation-config/>

    <!-- 设置使用注解的类所在的jar包 -->
    <context:component-scan base-package="com.credi****mony.adapter"></context:component-scan>

    <!-- 完成请求和注解POJO的映射 -->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>

    <!-- 加载配置属性文件 -->
    <context:property-placeholder ignore-unresolvable="true" location="classpath*:/application.properties"/>
    <context:property-placeholder location="classpath:log4j.properties"/>
    <!-- UTF8解决乱码问题 -->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>text/html;charset=UTF-8</value>
                        </list>
                    </property>
                </bean>
            </list>
        </property>
    </bean>

    <mvc:annotation-driven/>
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
            </list>
        </property>
    </bean>
    <!-- 定义视图文件解析 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="${web.view.prefix}"/>
        <property name="suffix" value="${web.view.suffix}"/>
    </bean>

    <!-- 对静态资源文件的访问， 将无法mapping到Controller的path交给default servlet handler处理 -->
    <mvc:default-servlet-handler/>

    <!-- 静态资源映射 -->
    <mvc:resources mapping="/static/**" location="/static/" cache-period="31536000"/>

    <!-- 定义无Controller的path<->view直接映射 -->
    <mvc:view-controller path="/" view-name="redirect:${web.view.index}"/>


    <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="org.apache.shiro.authz.UnauthorizedException">error/403</prop>
                <prop key="java.lang.Throwable">error/500</prop>
            </props>
        </property>
    </bean>

    <!-- 开启自动切面代理 -->
    <aop:aspectj-autoproxy/>
</beans>

　　2、对应的class文件，exection里的表达式要正确：

package com.creditharmony.adapter.service.baffle;

import com.creditharmony.common.util.DateUtils;
import org.apache.ibatis.binding.MapperMethod;
import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.util.Date;

@Aspect
@Component
public class InterceptorBaffle {
    private static final Logger logger = Logger.getLogger(InterceptorBaffle.class);

    // 一分钟，即60000ms
    private static final long ONE_MINUTE = 60000;

    // service层的统计耗时切面，类型必须为final String类型的,注解里要使用的变量只能是静态常量类型的
    public static final String POINT = "execution (* com.cred####ony.adapter.service..*.*(..))";


    /**
     *  进入方法后打印日志
     * @param joinPoint
     */
    @Before(POINT)
    public void before(JoinPoint joinPoint) {
        logger.debug(this.getMethodName(joinPoint)+" start "+  DateUtils.formatDateTime(new Date()));
    }

    /**
     * 方法结束打印日志
     * @param joinPoint
     */
    @After(POINT)
    public void after(JoinPoint joinPoint) {
        logger.debug(this.getMethodName(joinPoint)+" after"+ DateUtils.formatDateTime(new Date()));
    }

    /**
     * 统计方法执行耗时Around环绕通知
     * @param joinPoint
     * @return
     */
    @Around(POINT)
    public Object timeAround(ProceedingJoinPoint joinPoint) {
        // 定义返回对象、得到方法需要的参数
        Object obj = null;
        Object[] args = joinPoint.getArgs();
        long startTime = System.currentTimeMillis();

        try {
            obj = joinPoint.proceed(args);
        } catch (Throwable e) {
            logger.error("统计某方法执行耗时环绕通知出错", e);
        }

        // 获取执行的方法名
        long endTime = System.currentTimeMillis();
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        String methodName = signature.getDeclaringTypeName() + "." + signature.getName();

        // 打印耗时的信息
        this.printExecTime(methodName, startTime, endTime);

        return obj;
    }

    /**
     * 打印方法执行耗时的信息，如果超过了一定的时间，才打印
     * @param methodName
     * @param startTime
     * @param endTime
     */
    private void printExecTime(String methodName, long startTime, long endTime) {
        long diffTime = endTime - startTime;
        if (diffTime > ONE_MINUTE) {
            logger.warn("-----" + methodName + " 方法执行耗时：" + diffTime + " ms");
        }
    }


    /**
     * 获取方法名(类的详细包路径)
     * @param joinPoint
     * @return
     */
    private String getMethodName(JoinPoint joinPoint){
        return joinPoint.getSignature().getDeclaringTypeName() +
                "." + joinPoint.getSignature().getName();
    }

}