spring的AOP应用输出日志

摘要: spring的AOP应用输出日志

1.ArithmeticCalculator.java

package com.huanlgiusong.spring.aop.impl;

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

int sub(int i, int j);

int mul(int i, int j);

int div(int i, int j);
}

2.ArithmeticCalculatorImpl.java

package com.huanlgiusong.spring.aop.impl;

import org.springframework.stereotype.Component;

@Component("arithmeticCalculator")
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;
}

}

3.LoggingAspect.java

package com.huanlgiusong.spring.aop.impl;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

//吧这个类声明为一个切面 需要把这个类放入到IOC容器中去再声明为一个切面 然后要声明before让它在哪个方法之前执行
@Aspect
@Component
public class LoggingAspect {
//声明方法是一个前置通知 在目标方法开始之前执行
@Before("execution(public  int com.huanlgiusong.spring.aop.impl.ArithmeticCalculator.add(int , int ))")
public void beforeMethod(){
System.out.println("the method begins");
}

}

4.TestAop.java

package com.huanlgiusong.spring.aop.impl;

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

public class TestAop {
@Test
public void test1() {
// 1.创建Spring的IOC容器
ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
// 2.从IOC容器中获取bean的实例
ArithmeticCalculator arithmeticCalculator = (ArithmeticCalculator) ctx
.getBean("arithmeticCalculator");
// 3.使用bean
int result = arithmeticCalculator.add(1, 100);
System.out.println(result);
}
}

5.applicationContext.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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd"> <!-- 配置扫描包 -->
<context:component-scan base-package="com.huanlgiusong.spring.aop.impl"></context:component-scan>
<!--使用AspectJ 注解起作用 ：自动为匹配的类生成代理对象  -->
<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>