spring aop的两种写法aspect和advisor

  • Z时代
  • 2024-01-10
  • 分类：综合

本文内容纲要：

- 本文转自：https://www.cnblogs.com/leiOOlei/p/3709607.html
- 1. 第一种方法aop:config中配置aop:pointcut和aop:aspect
- 2. 第二种方法aop:config中配置aop:pointcut和aop:advisor

本文转自：https://www.cnblogs.com/leiOOlei/p/3709607.html

首先看个例子，如下

接口代码：

package com.lei.demo.aop.schema;
public interface IHello {
    public void sayHello();
}

接口实现：

package com.lei.demo.aop.schema;
public class HelloService implements IHello {
    public void sayHello() {
        System.out.println("-----Hello World!-----");
    }
}

接下来我们要实现AOP，即调用sayHello方法时切入通知。

1. 第一种方法aop:config中配置aop:pointcut和aop:aspect

定义一个切面支持类HelloAspect.java

package com.lei.demo.aop.schema;
/*
 * 切面支持类
 */
public class HelloAspect {
    //前置通知  
    public void beforeAdvice() {  
        System.out.println("===========before advice");  
    }
    //后置最终通知  
    public void afterFinallyAdvice() {  
        System.out.println("===========after finally advice");
    }
}

Xml配置：Spring-AOP-Schema.xml

<?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  
           http://www.springframework.org/schema/beans/spring-beans-3.2.xsd  
           http://www.springframework.org/schema/aop  
           http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">
    <!-- 目标类 -->
    <bean id="helloService" class="com.lei.demo.aop.schema.HelloService" />
    <bean id="helloAspect" class="com.lei.demo.aop.schema.HelloAspect" />
    <!-- 配置切面 -->
    <!-- aop:advisor，是有顺序的，必须放在aop:pointcut之后 -->
    <aop:config>
        <aop:pointcut id="helloPointcut" expression="execution(* com.lei.demo.aop.schema..*.*(..))" />
        <aop:aspect ref="helloAspect">
            <!—以下使用了两种方法定义切入点  pointcut-ref和pointcut-->
            <aop:before pointcut-ref="helloPointcut" method="beforeAdvice" />
            <aop:after pointcut="execution(* com.lei.demo.aop.schema..*.*(..))" method="afterFinallyAdvice" />
        </aop:aspect>
    </aop:config>
</beans>

以上配置中method=*"beforeAdvice"**、method="afterFinallyAdvice"*对应helloAspect中的方法

测试，App.java

package com.lei.demo.aop.schema;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App {
    private static ApplicationContext ctx;
    public static void main(String[] args) {
        ctx = new ClassPathXmlApplicationContext("Spring-AOP-Schema.xml");
        IHello helloService = ctx.getBean("helloService",IHello.class);
        helloService.sayHello();
    }
}

运行App.java，结果如下：

===========before advice

-----Hello World!-----

===========after finally advice

2. 第二种方法aop:config中配置aop:pointcut和aop:advisor

实现org.aopalliance.intercept.MethodInvocation接口，

HelloAroundAdvice.java如下：

package com.lei.demo.aop.schema;
import java.lang.reflect.Method;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
public class HelloAroundAdvice implements MethodInterceptor {
    public Object invoke(MethodInvocation arg0) throws Throwable {
        System.out.println("++++++before advice");
        arg0.proceed();
        System.out.println("++++++after advice");
        return null;
    }
}

Xml配置：Spring-AOP-Schema.xml

<?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  
           http://www.springframework.org/schema/beans/spring-beans-3.2.xsd  
           http://www.springframework.org/schema/aop  
           http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">
    <!-- 目标类 -->
    <bean id="helloService" class="com.lei.demo.aop.schema.HelloService" />
    <bean id="helloArroundAdvice" class="com.lei.demo.aop.schema.HelloAroundAdvice" />
    <!-- 配置切面 -->
    <aop:config>
        <aop:pointcut id="helloPointcut" expression="execution(* com.lei.demo.aop.schema..*.*(..))" />
        <aop:advisor advice-ref="helloArroundAdvice" pointcut-ref="helloPointcut"/>
    </aop:config>
</beans>

仍然运行App.java，结果如下：

++++++before advice

-----Hello World!-----

++++++after advice

本文内容总结：本文转自：https://www.cnblogs.com/leiOOlei/p/3709607.html，1. 第一种方法aop:config中配置aop:pointcut和aop:aspect，2. 第二种方法aop:config中配置aop:pointcut和aop:advisor，

原文链接：https://www.cnblogs.com/flying607/p/7833700.html

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