spring AOP

1.spring AOP 前置通知

package com.zixue.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/emp")
public class EmpController {

    /**
     * 查询员工
     * */
    @RequestMapping("/findEmp.do")
    public String find(){
        //模拟查询员数据
        System.out.println("查询员工数据，发送至列表页面");
        return "emp/emp_list.jsp";
        
    } 
}

package com.zixue.aspect;
/**
 * 用于记录日志的方面组件，演示Spring AOP的各种通知类型
 * 
 * */
public class OperateLogger {
/**
 * 前置通知 后置通知 最终通知使用的方法
 * */
    public void log1(){
        //记录日志
        System.out.println("-->记录用户操作信息");
        
    }
}

<?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:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd     
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
     

        <!-- 开启注解扫描 -->
        <context:component-scan base-package="com.zixue"/>
        <!-- 开启RequestMapping注解 -->
        <mvc:annotation-driven/>
        <!-- 处理请求转发 -->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/jsp/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
     
        
     <!-- 声明方面组件 -->
     <bean id="operateLogger" class="com.zixue.aspect.OperateLogger"/>
     
     <!-- 配置AOP -->
     <aop:config>
         <aop:aspect ref="operateLogger">
            <aop:before method="log1"         
              pointcut="within(com.zixue.controller..*)"/>
         </aop:aspect>
     </aop:config>
        </beans>

package com.zixue.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zixue.controller.EmpController;

public class TestEmpController {
    @Test
    public void test1(){
        ApplicationContext ac =new ClassPathXmlApplicationContext("applicationContext.xml");
        EmpController ctl =ac.getBean(EmpController.class);
        System.out.println(ctl.find());
        
    }
}

2.spring AOP 环绕通知

package com.zixue.aspect;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.aspectj.lang.ProceedingJoinPoint;

/**
 * 用于记录日志的方面组件，演示Spring AOP的各种通知类型
 * 
 * */
public class OperateLogger {
/**
 * 前置通知 后置通知 最终通知使用的方法
 * */
    public void log1(){
        //记录日志
        System.out.println("-->记录用户操作信息");
        
    }
    /**
     * 环绕通知使用方法
     * @throws Throwable 
     * */
    public Object log2(ProceedingJoinPoint p) throws Throwable{
        //目标组件的类名
        String className =p.getTarget().getClass().getName();
        //调用的方法名
        String method=p.getSignature().getName();
        //当前系统时间
        String date =new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(new Date());
        //拼日志信息
        String msg="-->用户在"+date+",执行了"+className+"."+method+"()";
        //记录日志
        System.out.println(msg);
        //执行目标组件的方法
        Object obj =p.proceed();
        //在调用目标组件业务方法后也可以做一些业务处理
        System.out.println("--->调用目标组件业务方法后...");
        return obj;
    }
}

<?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:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd     
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
     

        <!-- 开启注解扫描 -->
        <context:component-scan base-package="com.zixue"/>
        <!-- 开启RequestMapping注解 -->
        <mvc:annotation-driven/>
        <!-- 处理请求转发 -->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/jsp/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
     
        
     <!-- 声明方面组件 -->
     <bean id="operateLogger" class="com.zixue.aspect.OperateLogger"/>
     
     <!-- 配置AOP -->
     <aop:config>
         <aop:aspect ref="operateLogger">
            <aop:before method="log1"         
              pointcut="within(com.zixue.controller..*)"/>
         </aop:aspect>
         
         <aop:aspect ref="operateLogger">
              <aop:around method="log2" 
               pointcut="within(com.zixue.controller..*)"/>
         </aop:aspect>
     </aop:config>
     
    
        </beans>

3.spring AOP 异常通知

	/**
	 * 异常通知使用的方法
	 * */
	public void log3(Exception e){
		StackTraceElement[] elems =e.getStackTrace();
		//将异常信息记录
		System.out.println("-->"+elems[0].toString());
	}

　　

<!-- 声明方面组件 -->
     <bean id="operateLogger" class="com.zixue.aspect.OperateLogger"/>
     
	 <!-- 配置AOP -->
	 <aop:config>
	 	<aop:aspect ref="operateLogger">
			<aop:before method="log1" 		
	 		 pointcut="within(com.zixue.controller..*)"/>
	 	</aop:aspect>
	 	
	 	<aop:aspect ref="operateLogger">
	 	 	<aop:around method="log2" 
	 	 	 pointcut="within(com.zixue.controller..*)"/>
	 	</aop:aspect>
	 	
	 	<aop:aspect ref ="operateLogger">
	 		<aop:after-throwing method="log3" throwing="e" 
	 		 pointcut="within(com.zixue.controller..*)"/>
	 	</aop:aspect>
	 </aop:config>

4.sping AOP 注解使用

--@Aspect:用于声明方面组件

  @Before：用于声明前置通知

  @AfterReturning：用于声明后置通知

  @After：用于声明最终通知

  @Around：用于声明环绕通知

  @AfterThrowing：用于声明异常通知