基于xml的AOP开发

开发明确

• 编写核心业务类代码（目标类的目标方法）
• 编写切面类，切面类中有增强方法
• 在配置文件中，配置织入关系

1、快速入门

原先代码可查看https://blog.csdn.net/weixin_35798336/article/details/112466111。期间有用底层实现的动态代理，实际上也就是把代理对象的工厂用配置形式实现。

1. 导入AOP相关坐标

   
   <project xmlns="http://maven.apache.org/POM/4.0.0"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
       <modelVersion>4.0.0modelVersion>
   
       <groupId>com.chengroupId>
       <artifactId>SpringartifactId>
       <packaging>pompackaging>
       <version>1.0-SNAPSHOTversion>
       <modules>
           <module>05spring-accountmodule>
           <module>06spring-aopmodule>
       modules>
   
       <dependencies>
           <dependency>
               <groupId>junitgroupId>
               <artifactId>junitartifactId>
               <version>4.13.1version>
           dependency>
   
           
           <dependency>
               <groupId>org.springframeworkgroupId>
               <artifactId>spring-contextartifactId>
               <version>5.0.2.RELEASEversion>
           dependency>
   
           
           <dependency>
               <groupId>org.aspectjgroupId>
               <artifactId>aspectjweaverartifactId>
               <version>1.8.4version>
           dependency>
   
           <dependency>
               <groupId>org.springframeworkgroupId>
               <artifactId>spring-testartifactId>
               <version>5.0.2.RELEASEversion>
           dependency>
   
           <dependency>
               <groupId>commons-dbutilsgroupId>
               <artifactId>commons-dbutilsartifactId>
               <version>1.4version>
           dependency>
   
           <dependency>
               <groupId>com.mchangegroupId>
               <artifactId>c3p0artifactId>
               <version>0.9.5.2version>
           dependency>
   
           <dependency>
               <groupId>mysqlgroupId>
               <artifactId>mysql-connector-javaartifactId>
               <version>5.1.6version>
           dependency>
       dependencies>
   
       <properties>
           <maven.compiler.source>8maven.compiler.source>
           <maven.compiler.target>8maven.compiler.target>
       properties>
   
   project>
   

2. 创建目标接口(可自行创建)和目标类

3. 创建切面类（内部增强方法）

4. 将目标接口和切面类的创建交给spring

5. 在配置文件中配置织入关系

   
   <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.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd">
   
   
        
       
       <bean id="accountService" class="com.chen.service.impl.AccountServiceImpl">
           
           <property name="accountDao" ref="accountDao">property>
       bean>
   
       
       
       <bean id="txManager" class="com.chen.utils.TransactionManager">
           
           <property name="connectionUtils" ref="connectionUtils">property>
       bean>
   
       
       <aop:config>
           <aop:aspect id="txManagerAdvice" ref="txManager">
               <aop:pointcut id="pt1" expression="execution(* com.chen.service.impl.*.*(..))"/>
               <aop:before method="beginTransaction" pointcut-ref="pt1">aop:before>
               <aop:after method="commit" pointcut-ref="pt1">aop:after>
               <aop:after-throwing method="rollback" pointcut-ref="pt1">aop:after-throwing>
               <aop:after-returning method="release" pointcut-ref="pt1">aop:after-returning>
           aop:aspect>
       aop:config>
   
       
       <bean id="accountDao" class="com.chen.dao.impl.AccountDaoImpl">
           
           <property name="runner" ref="runner">property>
           
           <property name="connectionUtils" ref="connectionUtils">property>
       bean>
   
       
       <bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">bean>
   
       
       <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
           
           <property name="driverClass" value="com.mysql.jdbc.Driver">property>
           <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/nba">property>
           <property name="user" value="root">property>
           <property name="password" value="root">property>
       bean>
   
       
       <bean id="connectionUtils" class="com.chen.utils.ConnectionUtils">
           
           <property name="dataSource" ref="dataSource">property>
       bean>
   
   
   beans>
   

2、细节详解

1. 声明配置：

   <aop:config>aop:config>
   

2. aspect配置切面

   <aop:config>
       <aop:aspect id="txManagerAdvice" ref="txManager">aop:aspect>
   aop:config>
   

   id：给切面提供一个唯一标识。 ref：引用配置好的通知类 bean 的 id。

3. aop:pointcut配置切入点表达式

   <aop:config>
       <aop:before method="beginTransaction" pointcut-ref="pt1">aop:before>
               <aop:after-returning method="commit" pointcut-ref="pt1">aop:after-returning>
               <aop:after method="release" pointcut-ref="pt1">aop:after>
               <aop:after-throwing method="rollback" pointcut-ref="pt1">aop:after-throwing>
   aop:config>
   

   pointcut：切入点表达式，指对类的哪些方法进行增强

   method：指定通知中方法的名称。 pointct：定义切入点表达式 pointcut-ref：指定切入点表达式的引用

4. aop:xxx配置通知类型

   1. aop:before：用于配置前置通知。指定增强的方法在切入点方法之前执行
   2. aop:after-throwing：用于配置异常通知
   3. aop:after-returning：用于配置后置通知
   4. aop:after：用于配置最终通知