AspectJ实现AOP（xml配置方式）

青旅半醒 2022-05-21 01:44 259阅读 0赞

#### 【例子】用户登录添加日志功能 ####

##### 一、导jar包 #####

项日结构如下：

![70][]

![70 1][]

##### 二、创建相关类 #####

User类

package com.aop;
    public class User {
    	private String userName;	
    	public User(){}
    	public User(String userName) {
    		super();
    		this.userName = userName;
    	}
    	public String getUserName() {
    		return userName;
    	}
    	public void setUserName(String userName) {
    		this.userName = userName;
    	}
    	public void login(){
    		System.out.println("【"+this.userName+"】"+"用户正在登录。");
    	}
    }

MyAspect类

package com.aop;
    import org.aspectj.lang.JoinPoint;
    public class MyAspect {
    	//此方法作为前置通知
    	public void before(JoinPoint joinPoint){
    		//获取被调用的类名
    		String targetClassName=joinPoint.getTarget().getClass().getName();
    		//获取被调用的方法名
    		String targetMethodName=joinPoint.getSignature().getName();
    		//日志格式字符串
    		System.out.println("【前置通知】"+targetClassName+"类的"+targetMethodName+"方法开始执行。");
    	}
    }

测试类

package com.aop;
    import org.springframework.aop.BeforeAdvice;
    import org.springframework.aop.framework.ProxyFactory;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    public class Test {
    	public static void main(String[] args) {
    		//加载SpringAop.xml配置
    		ApplicationContext context=new ClassPathXmlApplicationContext("SpringAop.xml");
    		//获取配置中的user实例
    		User user=(User) context.getBean("user");
    		user.setUserName("马向林");
    		user.login();
    	}
    }

##### 三、配置SpringAop.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" 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.xsd"> 
    <bean id="user" class="com.aop.User"></bean>
    <bean id="myAspect" class="com.aop.MyAspect"></bean>
    <aop:config>
    	
    	<aop:aspect ref="myAspect">
    		
    		<aop:pointcut expression="execution(* com.aop.User.login(..))" id="myPointcut"/>
    		
    		<aop:before method="before" pointcut-ref="myPointcut"/>
    	</aop:aspect>
    </aop:config>
    </beans>

运行结果：

![70 2][]

[70]: /images/20220521/40382802139e48119bd377b0bf078916.png
[70 1]: /images/20220521/8e91474d1a6044a692c9086903023aca.png
[70 2]: /images/20220521/79fabf6898904e88a18af82a6b99f7d9.png