springboot：10-集成AOP

1. Spring中使用AOP

1.1 引入Aspect

<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>${aspectj.version}</version>
</dependency>

1.2 创建用于拦截的bean

public class TestBean {
    private String message = "test bean";

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public void test(){
        System.out.println(this.message);
    }
}

1.3 创建Advisor

@Aspect
public class AspectJTest {
    @Pointcut("execution(* *.test(..))")
    public void test(){
    }
    
    @Before("test()")
    public void beforeTest(){
        System.out.println("beforeTest");
    }
    
    @Around("test()")
    public Object aroundTest(ProceedingJoinPoint p){
        System.out.println("around.....before");
        Object o = null;
        try{
            o = p.proceed();
        }catch(Throwable e){
            e.printStackTrace();
        }
        System.out.println("around.....after");
        return o;
    }
    
    @After("test()")
    public void afterTest()
    {
        System.out.println("afterTest");
    }
 }

1.4 创建配置文件

要在Spring中开启AOP功能，还需要在配置文件中作如下声明，开启AOP：

<?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
        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.xsd">

    <aop:aspectj-autoproxy/>
    <bean id="test" class="com.yhl.myspring.demo.aop.TestBean">
        <property name="message" value="这是一个苦逼的程序员"/>
    </bean>
    <bean id="aspect" class="com.yhl.myspring.demo.aop.AspectJTest"/>
</beans>

1.5 注解开启AOP

开启AOPaop:aspectj-autoproxy/也可以使用注解的方式，如下，使用@EnableAspectJAutoProxy配置在任何一个@Configratrion或者@Component上

2. SpringBoot集成AOP

2.1 添加pom依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
</dependency>

引入了AOP的场景启动器，我们点击去看看

还是引入了spring-aop和aspectj的依赖，和我们Spring集成AOP是引入了相同的包，接着我们直接就可以创建Advisor了，如上AspectJTest这个类，但是我们并没有通过**@EnableAspectJAutoProxy开启AOP呢？那是因为AOP的自动配置类帮我们开启了**

2.2 AopAutoConfiguration

一旦导入了spring-boot-starter-aop依赖后，SpringBoot就会启动AOP的自动配置类AopAutoConfiguration：

我们来看看AopAutoConfiguration这个自动配置类

@Configuration
@ConditionalOnClass({ EnableAspectJAutoProxy.class, Aspect.class, Advice.class })
@ConditionalOnProperty(prefix = "spring.aop", name = "auto", havingValue = "true", matchIfMissing = true)
public class AopAutoConfiguration {

    @Configuration
    //使用注解开启AOP功能
    @EnableAspectJAutoProxy(proxyTargetClass = false)
    @ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "false", matchIfMissing = true)
    public static class JdkDynamicAutoProxyConfiguration {

    }

    @Configuration
    //使用注解开启AOP功能
    @EnableAspectJAutoProxy(proxyTargetClass = true)
    @ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true", matchIfMissing = false)
    public static class CglibAutoProxyConfiguration {

    }

}