spring用Aop实现计算器验证（注解方式）

//抽象类：ArithnmeticCalulator

public interface ArithnmeticCalulator {

int add(int i,int j);

int sub(int i,int j);

int mul(int i,int j);

int div(int i,int j);

}

//实现抽象类：ArithnmeticCalulator类

@Component("arithnmeticCalulator")

public class ArithnmeticCalulatorImpl implements ArithnmeticCalulator {

实现方法省去.....

}

LogginAspect实现

//把这个类声明为一个切面，需要吧该类放入IOC容器中，在声明一个切面

@Aspect

@Component

public class LogginAspect {

// 定义一个方法，用于声明切入点的表达式，一般在放中不需要添加其他的代码

@Pointcut("execution(* com.wzq.spring.aop.impl.*.*(..))")

public void declareJoinPointExpression() {

}

@Before("declareJoinPointExpression()")

public void beforeMethod(JoinPoint joinPoint) {

//获取ArithnmeticCalulator的method方法

String methodName = joinPoint.getSignature().getName();

//获取ArithnmeticCalulator的method值

List<Object> args = Arrays.asList(joinPoint.getArgs());

System.out.println("The method " + methodName + "begins" + args);

}

// 后置通知：在目标方法执行后执行的通知，执行的通通知 //后置通知不会返回结果

@After("declareJoinPointExpression()")

public void afterMethod(JoinPoint joinPoint) {

String methodName = joinPoint.getSignature().getName();

System.out.println("The method " + methodName + "ends");

} 

// 异常通知

@AfterThrowing(value ="declareJoinPointExpression()", throwing = "ex")

public void afterThrowing(JoinPoint joinPoint, Exception ex) {

String methodName = joinPoint.getSignature().getName();

System.out.println("The method " + methodName + "execution" + ex);

}

}

XML配置

<!-- 配置bean -->

<bean class="com.wzq.spring.aop.xml.ArithnmeticCalulatorImpl" id="arithnmeticCalulator"></bean>

<!-- 配置切面的bean -->

<bean id="logginAspect" class="com.wzq.spring.aop.xml.LogginAspect"></bean>

main方法

public class Main {

public static void main(String[] args) {

ApplicationContext ctx = new ClassPathXmlApplicationContext(

"applicationContext.xml");

ArithnmeticCalulator arithnmeticCalulator = ctx

.getBean(ArithnmeticCalulator.class);

int result = arithnmeticCalulator.sub(6, 6);

System.out.println("result:" + result);

int result1=arithnmeticCalulator.div(10, 0);

System.out.println(result1);

}

}