Spring AOP 的实现
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1 使用 API 实现 AOP
新建一个用户接口：UserService
1 package com.cqvie.aop.api; 2 3 public interface UserService { 4 5 public void add(String name); 6 public void update(String name); 7 public void delete(String name); 8 public void select(String name); 9 }
实现接口类：UserServiceImpl
1 package com.cqvie.aop.api; 2 3 public class UserServiceImpl implements UserService { 4 5 @Override 6 public void add(String name) { 7 System.out.println("Add User " + name + " SUCCESS!"); 8 } 9 10 @Override 11 public void update(String name) { 12 System.out.println("Update User " + name + " SUCCESS!"); 13 } 14 15 @Override 16 public void delete(String name) { 17 System.out.println("Delete User " + name + " SUCCESS!"); 18 } 19 20 @Override 21 public void select(String name) { 22 System.out.println("Select User " + name + " SUCCESS!"); 23 } 24 25 }
写一个日志类，包括前置通知和后置通知：Log
1 package com.cqvie.aop.api; 2 3 import java.lang.reflect.Method; 4 5 import org.springframework.aop.AfterReturningAdvice; 6 import org.springframework.aop.MethodBeforeAdvice; 7 8 public class Log implements MethodBeforeAdvice, AfterReturningAdvice { 9 10 /** 11 * 前置通知 12 * @param method 被调用方法对象 13 * @param args 被调用的方法参数 14 * @param target 被调用的方法的目标对象 15 */ 16 @Override 17 public void before(Method method, Object[] args, Object target) throws Throwable { 18 System.out.println(target.getClass().getName() + " 的 " + 19 method.getName() + "方法被执行···"); 20 } 21 22 /** 23 * 后置通知 24 * @param returnValue 返回值 25 * @param method 被调用的方法对象 26 * @param args 被调用的方法对象的参数 27 * @param target 被调用的方法对象的目标对象 28 */ 29 @Override 30 public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable { 31 System.out.println(target.getClass().getName() + " 的 " + 32 method.getName() + "方法已成功执行！返回值为：" + returnValue); 33 System.out.println(); 34 } 35 }
配置 Spring 的配置文件：applicationContext01.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:aop="http://www.springframework.org/schema/aop" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans 7 http://www.springframework.org/schema/beans/spring-beans.xsd 8 http://www.springframework.org/schema/context 9 http://www.springframework.org/schema/context/spring-context.xsd 10 http://www.springframework.org/schema/aop 11 http://www.springframework.org/schema/aop/spring-aop.xsd"> 12 13 <bean id="userService" class="com.cqvie.aop.api.UserServiceImpl"></bean> 14 <bean id="log" class="com.cqvie.aop.api.Log"></bean> 15 <aop:config> 16 <aop:pointcut expression="execution(* com.cqvie.aop.api.UserServiceImpl.*(..))" id="pointcut"/> 17 <aop:advisor advice-ref="log" pointcut-ref="pointcut"/> 18 </aop:config> 19 20 </beans>
添加一个测试类：Test
1 package com.cqvie.aop.api; 2 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.support.ClassPathXmlApplicationContext; 5 6 public class Test { 7 8 public static void main(String[] args) { 9 10 @SuppressWarnings("resource") 11 ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext01.xml"); 12 UserService userService = (UserService) ac.getBean("userService"); 13 userService.update("AngeYu"); 14 userService.delete("AngeYu"); 15 16 } 17 18 }
运行结果：
2 自定义类实现 AOP
接口和接口的实现类不变，依旧是上面所提到的 UserService 和 UserServiceIpml
自己写一个日志类 Log，包含前置通知和后置通知
1 package com.cqvie.aop.custom; 2 3 public class Log { 4 5 public void before() { 6 System.out.println("----- method start -----"); 7 } 8 9 public void after() { 10 System.out.println("----- method end -----"); 11 } 12 13 }
配置 Spring 的配置文件：applicationContext02.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:aop="http://www.springframework.org/schema/aop" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans 7 http://www.springframework.org/schema/beans/spring-beans.xsd 8 http://www.springframework.org/schema/context 9 http://www.springframework.org/schema/context/spring-context.xsd 10 http://www.springframework.org/schema/aop 11 http://www.springframework.org/schema/aop/spring-aop.xsd"> 12 13 <bean id="userService" class="com.cqvie.aop.custom.UserServiceImpl"></bean> 14 <bean id="log" class="com.cqvie.aop.custom.Log"></bean> 15 <aop:config> 16 <aop:aspect ref="log"> 17 <aop:pointcut expression="execution(* com.cqvie.aop.custom.UserServiceImpl.*(..))" id="pointcut"/> 18 <aop:before method="before" pointcut-ref="pointcut"/> 19 <aop:after method="after" pointcut-ref="pointcut"/> 20 </aop:aspect> 21 </aop:config> 22 23 </beans>
添加一个测试类：Test
1 package com.cqvie.aop.custom; 2 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.support.ClassPathXmlApplicationContext; 5 6 public class Test { 7 8 public static void main(String[] args) { 9 10 @SuppressWarnings("resource") 11 ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext02.xml"); 12 UserService userService = (UserService) ac.getBean("userService"); 13 userService.update("AngeYu"); 14 15 } 16 17 }
运行结果：
3 使用注解实现 AOP
接口和接口的实现类不变，依旧是上面所提到的 UserService 和 UserServiceIpml
自己写一个日志类 Log，包含前置通知、后置通知、环绕通知
1 package com.cqvie.aop.annotation; 2 3 import org.aspectj.lang.ProceedingJoinPoint; 4 import org.aspectj.lang.annotation.After; 5 import org.aspectj.lang.annotation.Around; 6 import org.aspectj.lang.annotation.Aspect; 7 import org.aspectj.lang.annotation.Before; 8 9 @Aspect 10 public class Log { 11 12 @Before("execution(* com.cqvie.aop.annotation.UserServiceImpl.*(..))") 13 public void before() { 14 System.out.println("----- method start -----"); 15 } 16 17 @After("execution(* com.cqvie.aop.annotation.UserServiceImpl.*(..))") 18 public void after() { 19 System.out.println("----- method end -----"); 20 } 21 22 @Around("execution(* com.cqvie.aop.annotation.UserServiceImpl.*(..))") 23 public Object around(ProceedingJoinPoint pj) throws Throwable { 24 System.out.println("--- around start ---"); 25 System.out.println("方法签名：" + pj.getSignature()); 26 Object result = pj.proceed(); 27 System.out.println("--- around end ---"); 28 return result; 29 } 30 31 }
配置 Spring 的配置文件：applicationContext03.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:aop="http://www.springframework.org/schema/aop" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans 7 http://www.springframework.org/schema/beans/spring-beans.xsd 8 http://www.springframework.org/schema/context 9 http://www.springframework.org/schema/context/spring-context.xsd 10 http://www.springframework.org/schema/aop 11 http://www.springframework.org/schema/aop/spring-aop.xsd"> 12 13 <bean id="userService" class="com.cqvie.aop.annotation.UserServiceImpl"></bean> 14 <bean id="log" class="com.cqvie.aop.annotation.Log"></bean> 15 <aop:aspectj-autoproxy></aop:aspectj-autoproxy> 16 17 </beans>
添加一个测试类：Test
1 package com.cqvie.aop.annotation; 2 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.support.ClassPathXmlApplicationContext; 5 6 public class Test { 7 8 public static void main(String[] args) { 9 10 @SuppressWarnings("resource") 11 ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext03.xml"); 12 UserService userService = (UserService) ac.getBean("userService"); 13 userService.update("AngeYu"); 14 15 } 16 17 }
运行结果：
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