基于XML 配置文件的 Spring AOP 前置通知 后置通知 异常通知 返回通知 以及环绕通知

 

接口：ArithmeticCalculator.jav

package spring.aop.xml;

public interface ArithmeticCalculator {
	public int add(int i, int j);

	public int sub(int i, int j);

	public int mul(int i, int j);

	public int div(int i, int j);
}

　　

接口实现类： ArithmeticCalculatorImpl.java

package spring.aop.xml;

import org.springframework.stereotype.Component;

@Component
public class ArithmeticCalculatorImpl implements ArithmeticCalculator {

	@Override
	public int add(int i, int j) {
		int result = i + j;
		return result;
	}

	@Override
	public int sub(int i, int j) {
		int result = i - j;
		return result;
	}

	@Override
	public int mul(int i, int j) {
		int result = i * j;
		return result;
	}

	@Override
	public int div(int i, int j) {
		int result = i/j;
		return result;
	}
}

 

打Log的切面函数： LoggingAspect.java

package spring.aop.xml;

import java.util.Arrays;
import java.util.List;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.springframework.stereotype.Component;

//把这个类声明为一个切面：需要把该类放入到IOC容器中， 声明为一个切面

@Component
public class LoggingAspect {

	public void declareJoinPointExpression() {
	}

	public void beforeMethod(JoinPoint joinPoint) {
		String methodName = joinPoint.getSignature().getName();
		List<Object> args = Arrays.asList(joinPoint.getArgs());
		System.out.println("The " + methodName + " begins " + " args is: " + args);
	}

	public void afterMethod(JoinPoint joinPoint) {
		String methodName = joinPoint.getSignature().getName();
		List<Object> args = Arrays.asList(joinPoint.getArgs());
		System.out.println("The " + methodName + " ends " + methodName + " args is: " + args);
	}

	public void afterReturning(JoinPoint joinPoint, Object result) {
		String methodName = joinPoint.getSignature().getName();
		System.out.println("The " + methodName + " ends " + methodName + " return is: " + result);
	}

	public void afterThrowing(JoinPoint joinPoint, Exception ex) {
		String methodName = joinPoint.getSignature().getName();
		System.out.println("The " + methodName + " occurs exception " + ex);
	}

	/**
	 * 环绕通知需要携带ProceedingJoinPoint类型的参数 环绕通知类似于动态代理的全过程： ProceedingJoinPoint
	 * 类型的参数可以决定是否执行目标方法 且环绕通知必须有返回值，返回值即为目标方法的返回值
	 * 
	 * @param pjd
	 */
	public Object aroundMethod(ProceedingJoinPoint pjd) {
		Object result = null;
		String methodName = pjd.getSignature().getName();
		try {
			// 前置通知
			System.out
					.println("@Around before ----> The " + methodName + " begin with " + Arrays.asList(pjd.getArgs()));
			result = pjd.proceed();
			// 返回通知
			System.out.println("@Around return ----> The " + methodName + " return with " + result);
		} catch (Throwable e) {
			System.out.println("@Around exception ----> The " + methodName + " occurs exception " + e);
			throw new RuntimeException(e);
		}
		// 后置通知
		System.out.println("@Around after ----> The " + methodName + " ends");
		return result;
	}
}

 

验证结果的切面函数： ValidateResult.java

package spring.aop.xml;

import java.util.Arrays;
import java.util.List;

import org.aspectj.lang.JoinPoint;
import org.springframework.stereotype.Component;


@Component
public class ValidateResult {
	public void validateResult(JoinPoint joinPoint){
		String methodName = joinPoint.getSignature().getName();
		List<Object> args = Arrays.asList(joinPoint.getArgs());
		System.out.println("Validate " + methodName + args);
	}

}

　

Main.java

package spring.aop.xml;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
	public static void main(String[] args){
		int result;
		ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-xml.xml");
		ArithmeticCalculator arithmeticCalculator = (ArithmeticCalculator)ctx.getBean(ArithmeticCalculator.class);
		result = arithmeticCalculator.add(1, 2);
		System.out.println(result);
		
		result = arithmeticCalculator.div(4, 1);
		System.out.println(result);
	}

}

　　

配置文件：

applicationContext-xml.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"
	xmlns:context="http://www.springframework.org/schema/context"
	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-4.2.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">
	
    <bean id="arithmeticCalculatorImpl" class="spring.aop.xml.ArithmeticCalculatorImpl"></bean>
    <bean id="loggingAspect" class="spring.aop.xml.LoggingAspect"></bean>
    <bean id="validateResult" class="spring.aop.xml.ValidateResult"></bean>
    
    <!-- 配置AOP -->
    <aop:config>
        <!-- 配置切点表达式 -->
        <aop:pointcut expression="execution(* spring.aop.xml.ArithmeticCalculator.* (int, int))" id="pointcut"/>
        <!-- 配置切面通知 -->
        <aop:aspect ref="loggingAspect" order="2">
            <aop:before method="beforeMethod" pointcut-ref="pointcut"/>
            <aop:after method="afterMethod" pointcut-ref="pointcut"/>  
            <aop:after-throwing method="afterThrowing" pointcut-ref="pointcut" throwing="ex"/>
            <aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result"/>
            <aop:around method="aroundMethod" pointcut-ref="pointcut" />
        </aop:aspect>
        <aop:aspect ref="validateResult" order="1">
            <aop:before method="validateResult" pointcut-ref="pointcut"/>
        </aop:aspect>
    </aop:config>
</beans>