060_AOP
目录
什么是AOP
AOP在Spring中的作用
使用Spring实现AOP
导入依赖包
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.7</version>
</dependency>
配置文件详解
方式一：使用Spring的API接口
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>spring-study</artifactId>
<groupId>com.qing</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-07-aop</artifactId>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.7</version>
</dependency>
</dependencies>
</project>
package com.qing.service;
public interface UserService {
void add();
void delete();
void update();
void select();
}
package com.qing.service;
public class UserServiceImpl implements UserService {
public void add() {
System.out.println("新增用户");
}
public void delete() {
System.out.println("删除用户");
}
public void update() {
System.out.println("修改用户");
}
public void select() {
System.out.println("查询用户");
}
}
package com.qing.log;
import org.springframework.aop.MethodBeforeAdvice;
import java.lang.reflect.Method;
public class Log implements MethodBeforeAdvice {
/**
*
* @param method 要执行的目标对象的方法
* @param objects 参数
* @param o 目标对象
* @throws Throwable
*/
public void before(Method method, Object[] objects, Object o) throws Throwable {
System.out.println(o.getClass().getName() + "的" + method.getName() + "被执行了");
}
}
package com.qing.log;
import org.springframework.aop.AfterReturningAdvice;
import java.lang.reflect.Method;
public class AfterLog implements AfterReturningAdvice {
/**
*
* @param returnValue 返回值
* @param method
* @param args
* @param target
* @throws Throwable
*/
public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
System.out.println("执行" + method.getName() + "，返回结果为：" + returnValue);
}
}
<?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: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/aop https://www.springframework.org/schema/aop/spring-aop.xsd">
<!--注册bean-->
<bean id="userService" class="com.qing.service.UserServiceImpl"/>
<bean id="log" class="com.qing.log.Log"/>
<bean id="afterLog" class="com.qing.log.AfterLog"/>
<!--配置aop：需要导入aop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.qing.service.UserServiceImpl.*(..))"/>
<!--执行环绕增加，哪个类切入哪个切入点-->
<aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
<aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/>
</aop:config>
</beans>
import com.qing.service.UserService;
import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MyTest {
@Test
public void test01() {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
// 注意：动态代理代理的是接口
UserService userService = context.getBean("userService", UserService.class);
userService.add();
}
}
方式二：自定义实现AOP
package com.qing.diy;
public class DiyAspect {
public void before() {
System.out.println("方法执行前");
}
public void after() {
System.out.println("方法执行后");
}
}
<?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: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/aop https://www.springframework.org/schema/aop/spring-aop.xsd">
<!--注册bean-->
<bean id="userService" class="com.qing.service.UserServiceImpl"/>
<bean id="log" class="com.qing.log.Log"/>
<bean id="afterLog" class="com.qing.log.AfterLog"/>
<!--自定义类-->
<bean id="diy" class="com.qing.diy.DiyAspect"/>
<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.qing.service..*.*(..))"/>
<!--通知-->
<aop:before method="before" pointcut-ref="point"/>
<aop:after method="after" pointcut-ref="point"/>
</aop:aspect>
</aop:config>
</beans>
import com.qing.service.UserService;
import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MyTest {
@Test
public void test01() {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
// 注意：动态代理代理的是接口
UserService userService = context.getBean("userService", UserService.class);
userService.add();
}
}
方式三：使用注解实现AOP
package com.qing.diy;
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;
@Aspect // 标注这个类是一个切面
public class AnnotationAspect {
@Before("execution(* com.qing.service..*.*(..))")
public void before() {
System.out.println("方法执行前");
}
@After("execution(* com.qing.service..*.*(..))")
public void after() {
System.out.println("方法执行后");
}
// 在环绕增强中，我们可以给定一个参数，代表我们要获取处理切入的点
@Around("execution(* com.qing.service..*.*(..))")
public void around(ProceedingJoinPoint jp) throws Throwable {
System.out.println("环绕前");
jp.proceed();// 注：执行方法，必须写，否则不执行切入点方法
System.out.println("环绕后");
}
}
<?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: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/aop https://www.springframework.org/schema/aop/spring-aop.xsd">
<!--注册bean-->
<bean id="userService" class="com.qing.service.UserServiceImpl"/>
<bean id="log" class="com.qing.log.Log"/>
<bean id="afterLog" class="com.qing.log.AfterLog"/>
<bean id="annotationAspect" class="com.qing.diy.AnnotationAspect"/>
<!--开启注解支持 JDK(默认 proxy-target-class="false") cglib(proxy-target-class="true")-->
<aop:aspectj-autoproxy/>
</beans>
import com.qing.service.UserService;
import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MyTest {
@Test
public void test01() {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
// 注意：动态代理代理的是接口
UserService userService = context.getBean("userService", UserService.class);
userService.add();
}
}
使用Spring AOP修改请求、返回参数
参考：https://blog.csdn.net/weixin_33785108/article/details/91911138
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