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