- aop基本概念
- aop操作准备
- 使用表达式配置切入点
aop操作基本概念
1 在spring里面进行aop操作,使用 aspectj(饿死怕死J)实现
(1)aspectj不是spring一部分,和spring一起使用进行aop操作
(2)Spring2.0以后新增了对AspectJ支持
2 使用aspectj实现aop有两种方式
(1)基于aspectj的xml配置
(2)基于aspectj的注解方式
aop操作准备
导入Maven依赖和aop约束
<!-- ioc编程 -->
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
使用表达式配置切入点
1 切入点:实际增强的方法
2 常用的表达式
execution(<访问修饰符>?<返回类型><方法名>(<参数>)<异常>)
(1)execution(* cn.itcast.aop.Book.add(..))
含义:任意修饰符,在cn.itcast.aop包下Book类中add方法(),有参数也包含
(2)execution(* cn.itcast.aop.Book.(..))
含义:任意修饰符,在cn.itcast.aop包下Book类中所有方法(),有参数也包含
(3)execution( .(..))
含义:任意修饰符,在所有类下所有方法,有参数也包含
(4) 匹配所有save开头的方法 execution(* save*(..))
含义:任意修饰符,以save开头的任意方法都增强,有参数也包含
3 AspectJ支持5种类型的通知注解:
@Before:前置通知,在方法执行之前返回
@After:后置通知,在方法执行后执行
@AfterRunning:返回通知,在方法返回结果之后执行
@AfterThrowing:异常通知,在方法抛出异常之后
@Around:环绕通知,围绕着方法执行
package com.neuedu.aop;
public class Book {
public void add() {
System.out.println("add...........");
}
}
package com.neuedu.aop;
public class MyBook {
public void before1() {
System.out.println("前置增强......");
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
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:aop="http://www.springframework.org/schema/aop"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
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/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<!-- 1.配置对象 -->
<bean id="book" class="com.neuedu.aop.Book"></bean>
<bean id="myBook" class="com.neuedu.aop.MyBook"></bean>
<!-- 2.配置Aop操作 -->
<aop:config>
<!-- 2.1配置切入点 -->
<aop:pointcut expression="execution(* com.neuedu.aop.Book.*(..))" id="qieru"/>
<!-- 2.2配置切面,把增强用到方法上面 -->
<aop:aspect ref="myBook">
<!-- 2.3配置增强类型method:增强类里面使用哪个方法作为前置-->
<aop:before method="before1" pointcut-ref="qieru"/>
</aop:aspect>
</aop:config>
</beans>
其他Aspectj的aop其他操作
package com.neuedu.aop;
import org.aspectj.lang.ProceedingJoinPoint;
public class MyBook {
public void before1() {
System.out.println("前置增强......");
}
public void after1() {
System.out.println("后置增强......");
}
//环绕通知
public void around1(ProceedingJoinPoint proceedingJoinPoint) throws Throwable{
//方法之前
System.out.println("方法之前...");
//执行被增强的方法
proceedingJoinPoint.proceed();
//方法之后
System.out.println("方法之后...");
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
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:aop="http://www.springframework.org/schema/aop"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
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/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<!-- 1.配置对象 -->
<bean id="book" class="com.neuedu.aop.Book"></bean>
<bean id="myBook" class="com.neuedu.aop.MyBook"></bean>
<!-- 2.配置Aop操作 -->
<aop:config>
<!-- 2.1配置切入点 -->
<aop:pointcut expression="execution(* com.neuedu.aop.Book.*(..))" id="qieru"/>
<!-- 2.2配置切面,把增强用到方法上面 -->
<aop:aspect ref="myBook">
<!-- 2.3配置增强类型method:增强类里面使用哪个方法作为前置-->
<aop:before method="before1" pointcut-ref="qieru"/>
<!-- 后置增强 -->
<aop:after-returning method="after1" pointcut-ref="qieru"/>
<!-- 环绕通知 -->
<aop:around method="around1" pointcut-ref="qieru"/>
</aop:aspect>
</aop:config>
</beans>