D:\Java\IdeaProjects\JavaProj\SpringHelloWorld\src\aop.xml
<context:component-scan base-package="com.xiya.spring.aop"/>
在xml配置了这个标签后，spring可以自动去扫描base-pack下面或者子包下面的Java文件，
如果扫描到有@Component @Controller@Service等这些注解的类，则把这些类注册为bean
com/xiya/spring/aop/advice/LoggingAspect.java
package com.xiya.spring.aop.advice;
/**
* Created by N3verL4nd on 2017/3/24.
*/
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;
import java.util.Arrays;
import java.util.List;
/**
* 如何把这个类声明为一个切面：
* 1、把该类放入IOC容器中
* 2、再声明为一个切面
*/
@Aspect
@Component
public class LoggingAspect {
//声明该方法是一个前置通知：在目标方法执行之前执行
@Before("execution(public int com.xiya.spring.aop.service.impl.ArithmeticCalculatorImpl.*(int,int))")
public void doBefore(JoinPoint joinPoint) {
String methodName = joinPoint.getSignature().getName();
List args = Arrays.asList(joinPoint.getArgs());
System.out.println("The method " + methodName + " begins with " + args);
}
//后置通知：在目标方法执行后（无论是否发生异常）执行的通知
//在后置通知中还不能访问目标方法执行的结果
@After("execution(* com.xiya.spring.aop.service.impl.ArithmeticCalculatorImpl.*(int,int))")
public void doAfter(JoinPoint joinPoint) {
String methodName = joinPoint.getSignature().getName();
System.out.println("the method " + methodName + " ends!");
}
}
com/xiya/spring/aop/service/ArithmeticCalculator.java
package com.xiya.spring.aop.service;
/**
* Created by N3verL4nd on 2017/3/24.
*/
public interface ArithmeticCalculator {
int add(int x, int y);
int sub(int x, int y);
int mul(int x, int y);
int div(int x, int y);
}
com/xiya/spring/aop/service/impl/ArithmeticCalculatorImpl.java
package com.xiya.spring.aop.service.impl;
import com.xiya.spring.aop.service.ArithmeticCalculator;
import org.springframework.stereotype.Component;
/**
* Created by N3verL4nd on 2017/3/24.
*/
@Component
public class ArithmeticCalculatorImpl implements ArithmeticCalculator {
@Override
public int add(int x, int y) {
int result = x + y;
//int z = 1 / 0;
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 div(int x, int y) {
int result = x / y;
return result;
}
}
com/xiya/spring/aop/test/Main.java
package com.xiya.spring.aop.test;
import com.xiya.spring.aop.service.ArithmeticCalculator;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* Created by N3verL4nd on 2017/3/24.
*
*/
public class Main {
public static void main(String[] args) {
//1、创建Spring的IOC容器
ApplicationContext context = new ClassPathXmlApplicationContext("aop.xml");
//2、从IOC容器中获取bean实例
ArithmeticCalculator calculator = context.getBean(ArithmeticCalculator.class);
//3、使用bean
int result = calculator.add(10, 20);
System.out.println("result = " + result);
result = calculator.div(10, 2);
System.out.println("result = " + result);
}
}
Original: https://www.cnblogs.com/lgh1992314/p/6616192.html
Author: N3verL4nd
Title: Spring基于注解配置AOP
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