1 解析
2 代码演练
2.1 类的方式实现各种通知
1 解析
2 代码演练
2.1 类的方式实现各种通知
测试类:
package com.imooc.test.aop; import org.junit.Test; import org.junit.runner.RunWith; import org.junit.runners.BlockJUnit4ClassRunner; import com.imooc.aop.api.BizLogic; import com.imooc.test.base.UnitTestBase; @RunWith(BlockJUnit4ClassRunner.class) public class TestAOPAPI extends UnitTestBase{ public TestAOPAPI() { super("classpath:spring-aop-api.xml"); // TODO Auto-generated constructor stub } @Test public void testSave(){ BizLogic bLogic = super.getbean("bizLogicImpl"); bLogic.save(); } }
配置文件:(可以细细看这篇详细内容)
<?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" xmlns:context="http://www.springframework.org/schema/context" 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-4.0.xsd 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" > <bean id="moocBeforeAdvice" class="com.imooc.aop.api.MoocBeforeAdvice"></bean> <bean id="moocAfterReturningAdvice" class="com.imooc.aop.api.MoocAfterReturningAdvice"></bean> <bean id="moocMethodInterceptor" class="com.imooc.aop.api.MoocMethodInterceptor"></bean> <bean id="moocThrowsAdvice" class="com.imooc.aop.api.MoocThrowsAdvice"></bean> <bean id="bizLogicImplTarget" class="com.imooc.aop.api.BizLogicImpl"></bean>
<!-- 执行所有sa打头的方法,都会引入切面 --><!-- 实现之一:NameMatchMethodPointcut,根据方法名字进行匹配 ,自带方法 -->
<bean id="pointcutBean" class="org.springframework.aop.support.NameMatchMethodPointcut">
<property name="mappedNames">
<list>
<value>sa*</value>
</list>
</property>
</bean>
<bean id="defaultAdvisor" class="org.springframework.aop.support.DefaultPointcutAdvisor">
<property name="advice" ref="moocBeforeAdvice"></property>
<property name="pointcut" ref="pointcutBean"></property>
</bean>
<!-- 从这里开始,引入多个通知 --><!-- 引入的业务类不是ProxyFactoryBean ,而是getObject返回的,即 target==》bizLogicImplTarget -->
<bean id="bizLogicImpl" class="org.springframework.aop.framework.ProxyFactoryBean">
<!-- 具体业务类 -->
<property name="target">
<ref bean="bizLogicImplTarget"/>
</property>
<!-- list通知不是按照顺序执行的,而是按照通知的先后顺序执行的,先执行前置通知,然后执行环绕通知,最后执行后置通知 -->
<property name="interceptorNames">
<list>
<value>defaultAdvisor</value>
<value>moocAfterReturningAdvice</value>
<value>moocMethodInterceptor</value>
<value>moocThrowsAdvice</value>
</list>
</property>
</bean>
</ beans >实体类:
package com.imooc.aop.api; public class BizLogicImpl implements BizLogic{ @Override public String save() { System.out.println("syso save"); return "BizLogicImpl save"; } }
接口类:
package com.imooc.aop.api; public interface BizLogic { String save(); }
前置通知:
package com.imooc.aop.api; import java.lang.reflect.Method; import org.springframework.aop.MethodBeforeAdvice; public class MoocBeforeAdvice implements MethodBeforeAdvice{ /** * 实现MethodBeforeAdvice接口,可以在连接点之前执行 * * * 作用是什么? * 将前一章中的xml配置方式改为了实现接口的实现方式 具体细节和使用参考开发文档 * */ @Override public void before(Method method, Object[] aobj, Object obj) throws Throwable { System.out.println("MoocBeforeAdvice:"+method.getName()+" "+ obj.getClass().getName()); } }
后置通知:
package com.imooc.aop.api; import java.lang.reflect.Method; import org.springframework.aop.AfterReturningAdvice; /** * 实现AfterReturningAdvice接口,可以在连接点之后执行 * @author weijingli * */ public class MoocAfterReturningAdvice implements AfterReturningAdvice{ /** * obj 作为输出 */ @Override public void afterReturning(Object obj, Method method, Object[] aobj, Object obj1) throws Throwable { System.out.println("MoocAfterReturningAdvice:"+method.getName()+ " 类的名称:"+obj1.getClass().getName()+" "+obj); } }
环绕通知:
package com.imooc.aop.api; import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; /** * 引入环绕通知 * * 实现 MethodInterceptor 接口 * @author weijingli * */ public class MoocMethodInterceptor implements MethodInterceptor{ @Override public Object invoke(MethodInvocation methodinvocation) throws Throwable { //实现前置通知的方法 //得到方法 得到类 System.out.println("MoocMethodInterceptor1:"+methodinvocation.getMethod().getName()+" " +methodinvocation.getStaticPart().getClass().getName()); Object obj = methodinvocation.proceed(); //实现后置通知方法 System.out.println("MoocMethodInterceptor2:"+obj); return obj; } }
异常通知:
package com.imooc.aop.api; import java.lang.reflect.Method; import org.springframework.aop.ThrowsAdvice; /** * 引入spring aop jar包 ,实现 ThrowsAdvice 接口 * 实现异常通知 * * 可以一参,可以多参 * @author weijingli * */ public class MoocThrowsAdvice implements ThrowsAdvice{ /** * * @param ex * @throws Throwable */ public void afterThrowing(Exception ex) throws Throwable{ System.out.println("MoocThrowAdvice afterThrowiing1"); } public void afterThrowing(Method method,Object[] args,Object target,Exception ex) throws Throwable{ System.out.println("MoocThrowAdvice afterThrowiing2:"+method.getName()+" " +target.getClass().getName()); } }
打印日志:
四月 21, 2019 6:16:29 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5abce07: startup date [Sun Apr 21 18:16:28 CST 2019]; root of context hierarchy 四月 21, 2019 6:16:29 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 信息: Loading XML bean definitions from class path resource [spring-aop-api.xml] MoocBeforeAdvice:save com.imooc.aop.api.BizLogicImpl MoocMethodInterceptor1:save java.lang.reflect.Method 四月 21, 2019 6:16:30 下午 org.springframework.context.support.ClassPathXmlApplicationContext doClose 信息: Closing org.springframework.context.support.ClassPathXmlApplicationContext@5abce07: startup date [Sun Apr 21 18:16:28 CST 2019]; root of context hierarchy syso save MoocMethodInterceptor2:BizLogicImpl save MoocAfterReturningAdvice:save 类的名称:com.imooc.aop.api.BizLogicImpl BizLogicImpl save