spring aop初学笔记

素颜马尾好姑娘i 2021-12-12 23:57 208阅读 0赞

1.spring配置文件

<?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:context="http://www.springframework.org/schema/context"
    	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/context
             http://www.springframework.org/schema/context/spring-context.xsd
             http://www.springframework.org/schema/aop   
    		 http://www.springframework.org/schema/aop/spring-aop.xsd">
    
    	<context:component-scan base-package="ty.jws" />
    	<aop:aspectj-autoproxy />
    
    </beans>

2.最简单的spring bean

package ty.jws.aop3;
    
    import org.springframework.stereotype.Component;
    
    @Component
    public class AopBean {
    	private String name;
    
    	public String getName() {
    		if (true) {
    			// throw new RuntimeException("不让你获取name属性");
    		}
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    }

3.aop类的编写

package ty.jws.aop3;
    
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.ProceedingJoinPoint;
    import org.aspectj.lang.annotation.After;
    import org.aspectj.lang.annotation.AfterReturning;
    import org.aspectj.lang.annotation.AfterThrowing;
    import org.aspectj.lang.annotation.Around;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    import org.aspectj.lang.annotation.Pointcut;
    import org.springframework.stereotype.Component;
    
    @Aspect
    @Component
    public class MIntercepter {
    
    	// 切入点：ty.jws下的所有类的所有方法
    	@Pointcut("execution(* ty.jws..*(..))")
    	public void pointcutAll() {
    	}
    
    	@Pointcut("execution(* ty.jws..get*(..))")
    	public void pointcutGet() {
    	}
    
    	@Pointcut("execution(* ty.jws..set*(..))")
    	public void pointcutSet() {
    	}
    
    	@Around("pointcutGet() or pointcutSet()")
    	public Object doAround(ProceedingJoinPoint jp) throws Throwable {
    		System.out.println(jp.getSignature().getName() + ",around begin");
    		Object ret = jp.proceed();
    		return ret;
    	}
    
    	@Before("pointcutAll() and args(String)")
    	public void doBefore(JoinPoint jp) throws Throwable {
    		System.out.println(jp.getSignature().getName() + ",before method");
    	}
    
    	@After("pointcutAll()")
    	public void doAfter(JoinPoint jp) throws Throwable {
    		System.out.println(jp.getSignature().getName() + ",after method");
    	}
    
    	@AfterReturning(pointcut = "pointcutAll()", returning = "retv")
    	public void doAfterReturning(JoinPoint jp, Object retv) {
    		System.out.println(jp.getSignature().getName() + ",after returning.retvalue=" + retv);
    	}
    
    	@AfterThrowing(pointcut = "pointcutAll()", throwing = "ex")
    	public void doAfterThrowing(JoinPoint jp, Exception ex) {
    		System.out.println(jp.getSignature().getName() + ",after throwing.exception=" + ex.getMessage());
    	}
    }

4.测试文件编写

package ty.jws.aop3;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Test {
    
    	public static void main(String[] args) throws Exception {
    		ApplicationContext context = new ClassPathXmlApplicationContext("aop3.xml");
    		AopBean bean = (AopBean) context.getBean(AopBean.class);
    		bean.setName("惊天危机");
    		bean.getName();
    	}
    
    }

5.运行结果

setName,around begin
    setName,before method
    setName,after method
    setName,after returning.retvalue=null
    getName,around begin
    getName,after method
    getName,after returning.retvalue=惊天危机