用XML方式配置重用切入点

待我称王封你为后i 2021-07-25 00:40 383阅读 0赞

**一 配置**

<?xml version="1.0" encoding="GBK"?>
    <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-4.0.xsd
         http://www.springframework.org/schema/aop
         http://www.springframework.org/schema/aop/spring-aop-4.0.xsd">
         <aop:config>
               
               <aop:pointcut id="myPointcut"
                    expression="execution(*  org.crazyit.app.service.impl.*.*(..))"/>
               <aop:aspect id="afterThrowingAdviceAspect"
                    ref="afterThrowingAdviceBean">
                    
                    <aop:after-throwing pointcut-ref="myPointcut"
                         method="doRecoveryActions" throwing="ex"/>
               </aop:aspect>
         </aop:config>
         
         <bean id="afterThrowingAdviceBean"
               class="org.crazyit.app.aspect.RepairAspect"/>
         <bean id="hello"  class="org.crazyit.app.service.impl.HelloImpl"/>
         <bean id="world"  class="org.crazyit.app.service.impl.WorldImpl"/>
    </beans>

**二 切面类**

package org.crazyit.app.aspect;
    
    public class RepairAspect
    {
         // 定义一个普通方法作为Advice方法
         // 形参ex用于访问目标方法中抛出的异常
         public void doRecoveryActions(Throwable ex)
         {
               System.out.println("目标方法中抛出的异常:" + ex);
               System.out.println("模拟Advice对异常的修复...");
         }
    }

**三 接口**

Hello

package org.crazyit.app.service;
    
    public interface Hello {
         // 定义一个简单方法，模拟应用中的业务逻辑方法
         void foo();
         // 定义一个addUser()方法，模拟应用中的添加用户的方法
         int addUser(String name, String pass);
    }

World

package org.crazyit.app.service;
    
    public interface World {
         // 定义一个简单方法，模拟应用中的业务逻辑方法
         public void bar();
    }

**四 实现类**

HelloImpl

package org.crazyit.app.service.impl;
    
    import org.springframework.stereotype.Component;
    
    import org.crazyit.app.service.*;
    
    @Component("hello")
    public class HelloImpl implements Hello
    {
        // 定义一个简单方法，模拟应用中的业务逻辑方法
        public void foo()
        {
            System.out.println("执行Hello组件的foo()方法");
        }
        // 定义一个addUser()方法，模拟应用中的添加用户的方法
        public int addUser(String name , String pass)
        {
            System.out.println("执行Hello组件的addUser添加用户：" + name);
            if(name.length() < 3 || name.length() > 10)
            {
                throw new IllegalArgumentException("name参数的长度必须大于3，小于10！");
            }
            return 20;
        }
    }

WorldImpl

package org.crazyit.app.service.impl;
    
    
    import org.springframework.stereotype.Component;
    import org.crazyit.app.service.*;
    
    @Component("world")
    public class WorldImpl implements World {
        // 定义一个简单方法，模拟应用中的业务逻辑方法
        public void bar() {
            System.out.println("执行World组件的bar()方法");
        }
    }

**五 测试类**

package lee;
    
    
    import org.springframework.context.*;
    import org.springframework.context.support.*;
    
    
    import org.crazyit.app.service.*;
    
    public class BeanTest
    {
        public static void main(String[] args)
        {
            // 创建Spring容器
            ApplicationContext ctx = new
                ClassPathXmlApplicationContext("beans.xml");
            Hello hello = ctx.getBean("hello" , Hello.class);
            hello.foo();
            hello.addUser("悟空" , "7788");
            World world = ctx.getBean("world" , World.class);
            world.bar();
    
    
        }
    }

**六 测试结果**

执行Hello组件的foo()方法
    执行Hello组件的addUser添加用户：悟空
    目标方法中抛出的异常:java.lang.IllegalArgumentException: name参数的长度必须大于3，小于10！
    模拟Advice对异常的修复...
    Exception in thread "main" java.lang.IllegalArgumentException:  name参数的长度必须大于3，小于10！
         at  org.crazyit.app.service.impl.HelloImpl.addUser(HelloImpl.java:27)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native  Method)
         at  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
         at  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
         at java.lang.reflect.Method.invoke(Method.java:498)
         at  org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
         at  org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
         at  org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
         at  org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:58)
         at  org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
         at  org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
         at  org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
         at  org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
         at com.sun.proxy.$Proxy2.addUser(Unknown Source)
         at lee.BeanTest.main(BeanTest.java:26)