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AOP
用Spring需要导入包
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
方式一：使用Spring接口
- 编写java
package com.kuang.log;
import org.springframework.aop.MethodBeforeAdvice;
import java.lang.reflect.Method;
public class Log implements MethodBeforeAdvice {
//method 要执行的目标对象的方法
//args 参数
//target 目标对象
public void before(Method method, Object[] args, Object target) throws Throwable {
System.out.println(target.getClass().getName() + "的" + method.getName() + "被执行了");
}
}
package com.kuang.log;
import org.aspectj.lang.annotation.AfterReturning;
import org.springframework.aop.AfterReturningAdvice;
import java.lang.reflect.Method;
public class AfterLog implements AfterReturningAdvice {
public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
System.out.println("执行了" + method.getName() + "返回结果为:" + returnValue);
}
}
- 编写xml文件
<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">
<!--注册bean-->
<bean id="userService" class="com.kuang.service.UserServiceImpl"/>
<bean id="log" class="com.kuang.log.Log"/>
<bean id="afterLog" class="com.kuang.log.AfterLog"/>
<!--方式一：使用原声Spring API接口-->
<!--配置opp：需要导入opp的约束-->
<aop:config>
<!--切入点：expression：表达式，execution(要执行的位置！* * * * *)-->
<aop:pointcut id="pointcut" expression="execution(* com.kuang.service.UserServiceImpl.*(..))"/>
<!--执行环绕增加-->
<aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
<aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/>
</aop:config>
</beans>
编写测试类
import com.kuang.pojo.User;
import com.kuang.service.UserService;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Mytest {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
UserService userService = (UserService)context.getBean("userService");
userService.add();
}
}
方式二：使用自定义类来实现AOP
package com.kuang.diy;
public class DiyPointCut {
public void before(){
System.out.println("===========方法执行前==========");
}
public void after(){
System.out.println("===========方法执行后==========");
}
}
xml配置文件
<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">
<!--方式二：自定义类-->
<bean id="diy" class="com.kuang.diy.DiyPointCut"/>
<aop:config>
<!--自定义切面，ref要引用的类-->
<aop:aspect ref="diy">
<!--切入点-->
<aop:pointcut id="point" expression="execution(* com.kuang.service.UserServiceImpl.*())"/>
<!--通知-->
<aop:before method="before" pointcut-ref="point"/>
<aop:after method="after" pointcut-ref="point"/>
</aop:aspect>
</aop:config>
</beans>
测试
import com.kuang.pojo.User;
import com.kuang.service.UserService;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Mytest {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
UserService userService = (UserService)context.getBean("userService");
userService.add();
}
}
方式三：使用注解实现
xml配置
<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">
<!--注册bean-->
<bean id="userService" class="com.kuang.service.UserServiceImpl"/>
<bean id="diy" class="com.kuang.diy.DiyPointCut"/>
<!--方式三：自定义类-->
<!--开启注解支持-->
<aop:aspectj-autoproxy/>
</beans>
package com.kuang.diy;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
@Aspect
public class DiyPointCut {
@Before("execution(* com.kuang.service.UserServiceImpl.*(..))")
public void before(){
System.out.println("===========方法执行前==========");
}
@After("execution(* com.kuang.service.UserServiceImpl.*(..))")
public void after(){
System.out.println("===========方法执行后==========");
}
//在环绕增强中，我们可以传入一个参数，代表我们要获取处理切入的点
@Around("execution(* com.kuang.service.UserServiceImpl.*(..))")
public void around(ProceedingJoinPoint jp) throws Throwable {
System.out.println("环绕前");
Signature signature = jp.getSignature();//获得签名
System.out.println("signature:" + signature);
Object proceed = jp.proceed();
System.out.println("环绕后");
}
}
测试
import com.kuang.pojo.User;
import com.kuang.service.UserService;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Mytest {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
UserService userService = (UserService)context.getBean("userService");
userService.add();
}
}
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