Spring -- 基于XML的AOP通知配置

上一篇博客，我们学习了基于注解配置AOP。

下面我们基于XML来配置AOP。

看代码

public interface Calculation {

    public int add(int x, int y);

    public int sub(int x, int y);

    public int mul(int x, int y);

    public int dev(int x, int y);
}

public class CalculationImpl implements Calculation {

    @Override
    public int add(int x, int y) {
        int result = x + y;
        System.out.println("executeing ...");
        return result;
    }

    @Override
    public int sub(int x, int y) {
        int result = x - y;
        return result;
    }

    @Override
    public int mul(int x, int y) {
        int result = x * y;
        return result;
    }

    @Override
    public int dev(int x, int y) {
        int result = x / y;
        System.out.println("executeing ...");
        return result;
    }

}

public class CalculationAspect {

    public void afterReturnMethod(JoinPoint joinPoint, Object ret) {
        String name = joinPoint.getSignature().getName();
        List<Object> list = Arrays.asList(joinPoint.getArgs());
        System.out.println("@AfterReturning ... ,method=" + name + ", args = "
                + list + ", return = " + ret);
    }

    public Object aroundMethod(ProceedingJoinPoint pjd) {
        String name = pjd.getSignature().getName();
        List<Object> list = Arrays.asList(pjd.getArgs());
        Object obj = null;

        System.out.println("前置通知 ... ,method=" + name + ", args = "
                + list);
        try {
            obj = pjd.proceed();
            System.out.println("返回通知 ... ,method=" + name + ", args = "
                    + list);
        } catch (Throwable e) {
            System.out.println("异常通知 ... , exception = " + e);
            e.printStackTrace();
        }
        System.out.println("后置通知 ... ,method=" + name + ", args = "
                + list);
        return obj;
    } 
}

第一个切入方法，我们其中有后置返回通知、环绕通知两个方法。

public class ValidateAspect {

    public void validate(){
        System.out.println("验证方法 com.gp.spring.aop.impl.ValidateAspect");
    }
}

第二个切入方法。

public class ValidateAspect {

    public void validate(){
        System.out.println("验证方法 com.gp.spring.aop.impl.ValidateAspect");
    }
}

<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" xmlns:cache="http://www.springframework.org/schema/cache" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-4.1.xsd">

    <bean id="calculationImpl" class="com.gp.spring.aop.impl.xml.CalculationImpl"></bean>

    <bean id="calculationAspect" class="com.gp.spring.aop.impl.xml.CalculationAspect"></bean>

    <bean id="validateAspect" class="com.gp.spring.aop.impl.xml.ValidateAspect"></bean>

    <aop:config>
        <aop:pointcut  expression="execution(public int com.gp.spring.aop.impl.xml.Calculation.*(int, int))" id="pointcut" />

        <aop:aspect ref="calculationAspect" order="1">
            <aop:after-returning method="afterReturnMethod" pointcut-ref="pointcut" returning="ret" />
            <aop:around method="aroundMethod" pointcut-ref="pointcut" />
        </aop:aspect>

        <aop:aspect ref="validateAspect" order="2">
            <aop:before method="validate" pointcut-ref="pointcut" />
        </aop:aspect>

    </aop:config>
</beans>

核心的东西来了
这里我们用XML配置代理了注解

执行测试方法

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext-xml.xml");
        Calculation calculation = (Calculation)context.getBean("calculationImpl");
        int result = calculation.add(1, 3);
        System.out.println(result);
    }

输出结果

前置通知 … ,method=add, args = [1, 3]
验证方法 com.gp.spring.aop.impl.ValidateAspect
executeing …
@AfterReturning … ,method=add, args = [1, 3], return = 4
返回通知 … ,method=add, args = [1, 3]
后置通知 … ,method=add, args = [1, 3]
4