标签:pac .sh 名称 poj const 任务 cat nbsp dem
(刚开始写东西,不足之处还请批评指正)
关于AOP的通知编写方式有两种,使用Schema-baesd或者使用AspectJ方式,本篇主要介绍Schema-baesd方式的代码实现。
(注:代码中没有添加任何业务逻辑,只是单纯的输出语句,若读者大人有什么业务逻辑希望本人实现作为参考的可以给我留言)
一. 实现通知方法
1.前置通知需要实现:MethodBeforeAdvice接口,并重写before方法
1 import java.lang.reflect.Method; 2 import org.springframework.aop.MethodBeforeAdvice; 3 4 public class BeforAdvice implements MethodBeforeAdvice { 5 6 @Override 7 public void before(Method method, Object[] objects, Object o) throws Throwable { 8 System.out.println("准备设备,准备武器弹药,组织救援人员"); 9 } 10 }
其中的几个参数:
1)Method method:切点方法
2)Object[] objects:切点方法参数(可能有多个或者没有)
3)Object o:切点所在类的对象
2.后置通知的实现需要实现:AfterReturningAdvice接口,并重写afterReturning方法
1 import java.lang.reflect.Method; 2 import org.springframework.aop.AfterReturningAdvice; 3 4 public class AfterAdvice implements AfterReturningAdvice { 5 6 @Override 7 public void afterReturning(Object o, Method method, Object[] objects, Object o1) 8 throws Throwable { 9 System.out.println("人员已救出,生命状态良好,无生命危险"); 10 } 11 }
其中的几个参数解释:
1)Object o:切点方法的返回值
2)Method method:切点方法
3)Object[] onjects:切点方法参数
4)Object o1:切点所在的类的对象
3.异常通知的实现需要实现:ThrowsAdice接口,由于ThrowsAdvice接口没有方法可重写,可以自己自定义一个方法,唯一要注意的是方法参数是切点将会抛出的异常名称,如果嫌麻烦可以使用Exception作为方法参数
1 import org.springframework.aop.ThrowsAdvice; 2 3 public class ErrorAdvice implements ThrowsAdvice { 4 public void afterThrowing(Exception e)throws Throwable{ 5 System.out.println("任务执行异常,任务失败"); 6 7 } 8 9 }
4.环绕通知的实现需要实现:MethodInterceptor接口,并重写invoke方法
1 import org.aopalliance.intercept.MethodInterceptor; 2 import org.aopalliance.intercept.MethodInvocation; 3 4 public class ArroundAdvice implements MethodInterceptor { 5 6 @Override 7 public Object invoke(MethodInvocation methodInvocation) throws Throwable { 8 //前置通知 9 System.out.println("环绕通知:准备设备,准备武器弹药,组织救援人员"); 10 //放行,调用切点方法 11 Object result=methodInvocation.proceed(); 12 //后置通知 13 System.out.println("环绕通知:人员已救出,生命状态良好,无生命危险"); 14 return result; 15 } 16 }
二. 实现切点所在的类
1 package com.xkx.pojo; 2 3 public class People { 4 private int age; 5 private String name; 6 private String sexual; 7 8 public int getAge() { 9 return age; 10 } 11 12 public void setAge(int age) { 13 this.age = age; 14 } 15 16 public String getName() { 17 return name; 18 } 19 20 public void setName(String name) { 21 this.name = name; 22 } 23 24 public String getSexual() { 25 return sexual; 26 } 27 28 public void setSexual(String sexual) { 29 this.sexual = sexual; 30 } 31 32 33 34 @Override 35 public String toString() { 36 return this.getAge()+"--"+this.getName()+"--"+this.getSexual(); 37 } 38 39 public People() { 40 } 41 42 public People(int age, String name, String sexual) { 43 this.age = age; 44 this.name = name; 45 this.sexual = sexual; 46 47 } 48 public void crraped(){ 49 System.out.println(this.getName()+"已被绑架"); 50 } 51 52 public void show(){ 53 System.out.println("切点执行:解救"+this.getName()+"任务"); 54 } 55 56 57 public void covert(){ 58 System.out.println("解救成功,召开新闻发布会"); 59 } 60 61 62 }
三. 在Spring的配置文件:applicationContext.xml中进行配置
1.添加aop依赖,可以去spring-framework中的Core technologies中搜索文档,搜索关键字:xmlns:aop
2.添加配置
<?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 ="beforeAdvice" class="com.xkx.adviceDemo.BeforAdvice"></bean> <bean id="afterAdvice" class="com.xkx.adviceDemo.AfterAdvice"></bean> <bean id="errorAdvice" class="com.xkx.adviceDemo.ErrorAdvice"></bean> <bean id="arroundAdvice" class="com.xkx.adviceDemo.ArroundAdvice"></bean> <aop:config> <aop:pointcut expression="execution(* com.xkx.pojo.People.show())" id="mypeople" ></aop:pointcut> <aop:advisor advice-ref="beforeAdvice" pointcut-ref="mypeople"></aop:advisor> <aop:advisor advice-ref="afterAdvice" pointcut-ref="mypeople"></aop:advisor> <aop:advisor advice-ref="errorAdvice" pointcut-ref="mypeople"></aop:advisor> <aop:advisor advice-ref="arroundAdvice" pointcut-ref="mypeople"></aop:advisor> </aop:config> <bean id ="people" class="com.xkx.pojo.People"> <constructor-arg index="0" name="age" type="int" value="22"></constructor-arg> <constructor-arg index="1" name="name" type="java.lang.String" value="吾先生"></constructor-arg> <constructor-arg index="2" name="sexual" type="java.lang.String" value="male"></constructor-arg> </bean> </beans>
四. 测试
1 package com.xkx.demotest; 2 3 import com.xkx.pojo.People; 4 import org.springframework.context.ApplicationContext; 5 import org.springframework.context.support.ClassPathXmlApplicationContext; 6 7 public class Test2 { 8 9 public static void main(String[] args) { 10 11 ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); 12 People people = ac.getBean("people",People.class); 13 people.crraped(); 14 people.show(); 15 people.covert(); 16 17 } 18 19 }
标签:pac .sh 名称 poj const 任务 cat nbsp dem
原文地址:https://www.cnblogs.com/Kaithy-Rookie/p/9783519.html