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Spring AOP编程实例

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一.通过注释实现切面编程

工程结构如下:


1.切面类Log.java,前置通知和后置通知以及环绕通知都在这里配置

package com.bijian.study.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Component
@Aspect //切面类
public class Log {
	
	/***
	 * 配置切入点,该方法无方法体
	 * 注意切入申明的格式,execution(Integer(返回的类型) com.bijian.study.service.UserService.add(String))
	 */
    @Pointcut("execution(* com.bijian.study.service..ad*(..))")//申明切人点,一个切入点会有很多的连接点
    public void aspectMethod(){};//配置切入点,该方法无方法体
    
    /***
     * 配置前置通知
     * @param joinpoint
     */
    @Before("aspectMethod()")
    public void dddbefore1(JoinPoint joinPoint){
    	System.out.println("before添加日志"+joinPoint);
    	
    }
    
     /***
     * 配置后置通知
     * @param joinpoint
     */
    @After("aspectMethod()")
    public void after(){
    	System.out.println("after添加日志");
    	
    }
    
     /***
     * 配置环绕通知
     * @param joinpoint
     */
    @Around("aspectMethod()")
    public void around(JoinPoint joinPoint){
    	System.out.println("开始around添加日志");
    	ProceedingJoinPoint pjp=(ProceedingJoinPoint)joinPoint;
    	try {
			pjp.proceed();
		} catch (Throwable e) {
			e.printStackTrace();
		}
    	System.out.println("结束around添加日志");
    }
}
2.业务接口类UserService.java
package com.bijian.study.service;

public interface UserService {
	
	public Integer add(String abc);

	public void aduser(String abc);
}
3.业务接口实现类UserServiceImpl.java
package com.bijian.study.service.impl;

import org.springframework.stereotype.Service;
import com.bijian.study.service.UserService;

@Service
public class UserServiceImpl implements UserService {
	
	@Override
	public Integer add(String abc) {
		System.out.println("添加用户信息1。"+abc);
		return 123;
	}

	@Override
	public void aduser(String abc) {
		System.out.println("添加用户信息2。");
	}
}
4.配置文件bean.xml
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

  <context:component-scan base-package="com"/>
  <!-- 采用了注释实现自动装配实现代理 -->
  <aop:aspectj-autoproxy/>
</beans>
5.测试类AopTest.java
package com.bijian.study.test;

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

import com.bijian.study.service.UserService;

public class AopTest {

	public static void main(String[] args) {
		
		ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
		UserService userService = (UserService) ac.getBean("userServiceImpl");
		userService.add("123oscar");
		// userService.aduser("456");
	}
}
运行结果:
开始around添加日志
before添加日志execution(Integer com.bijian.study.service.UserService.add(String))
添加用户信息1。123oscar
结束around添加日志
after添加日志

6.说明

  如果不采用spring的配置文件以及注释来申明的话,就需要实现很多的类。

  比如:

  通知类-用于说明切面类具有的功能.MethodBeforeAdvice

  切面类-用于说明具体的需要切入的功能,这个是重点要做的,比如添加日志的功能就在这里log。

  代理对象-用于申明要往哪里去切入日志功能的业务逻辑类proxyFactory。

  被代理对象-具体说明业务逻辑模块。比如Userserviceimpl 用于实现添加用户等功能。

 

二.通过aop配置文件来申明切面类,不用注释

工程结构如下:

  beans.xml配置文件,首先申明了切面类,然后申明了业务逻辑类,然后申明了AOP配置,配置切点和切面以及切入的方法。

1.配置文件bean.xml

<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
        
<!-- <context:component-scan base-package="com" /> <aop:aspectj-autoproxy/>-->
  <!-- 切面类 -->   
  <bean id="log" class="com.bijian.study.aop.Log"></bean>
  <!-- 用户管理 -->
  <bean id="userService" class="com.bijian.study.service.impl.UserServiceImpl"></bean>
  <!-- aop -->    
  <aop:config>
  <!-- 切点 -->
     <aop:pointcut expression="execution(* com.bijian.study.service..*.*(..))" id="pointcut"/>
     <aop:aspect ref="log">
     <!-- 通知 -->
          <aop:before method="dddbefore1" pointcut-ref="pointcut"/>
     </aop:aspect>
  </aop:config> 
</beans>

2.去掉注释的切面类Log.java

package com.bijian.study.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;

public class Log {

	/***
	 * 配置前置通知
	 * 
	 * @param joinpoint
	 */
	public void dddbefore1(JoinPoint joinPoint) {
		System.out.println("before添加日志:" + joinPoint);
		System.out.println("joinPoint.getTarget():" + joinPoint.getTarget());
	}

	/***
	 * 配置后置通知
	 * @param joinpoint
	 */
	public void after() {
		System.out.println("after添加日志");

	}

	/***
	 * 配置环绕通知
	 * @param joinpoint
	 */
	public void around(JoinPoint joinPoint) {
		
		System.out.println("开始around添加日志");
		ProceedingJoinPoint pjp = (ProceedingJoinPoint) joinPoint;
		try {
			pjp.proceed();
		} catch (Throwable e) {
			e.printStackTrace();
		}
		System.out.println("结束around添加日志");
	}
}

3.业务接口类UserService.java

package com.bijian.study.service;

public interface UserService {
	
	public Integer add(String abc);

	public void aduser(String abc);
}

4.业务接口实现类UserServiceImpl.java

package com.bijian.study.service.impl;

import com.bijian.study.service.UserService;

public class UserServiceImpl implements UserService {
	
	@Override
	public Integer add(String abc) {
		System.out.println("添加用户信息1。"+abc);
		return 123;
	}

	@Override
	public void aduser(String abc) {
		System.out.println("添加用户信息2。");
	}
}

5.测试类AopTest.java

package com.bijian.study.test;

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

import com.bijian.study.service.UserService;

public class AopTest {

	public static void main(String[] args) {
		
		ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
		UserService userService = (UserService) ac.getBean("userService");
		userService.add("123oscar");
		// userService.aduser("456");
	}
}

运行结果:

before添加日志:execution(Integer com.bijian.study.service.UserService.add(String))
joinPoint.getTarget():com.bijian.study.service.impl.UserServiceImpl@5762806e
添加用户信息1。123oscar

 

文章来源:https://my.oschina.net/u/2308739/blog/414702

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