详解原生Spring当中的事务_百度小程序

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一：Spring事务处理

1：什么是事务？

保证业务操作完整性的数据库操作，就是数据库中的操作要么一起成功要么一起失败，而且不能产生响应的影响，事务这个概念是数据库的范畴，我们通过Java代码只是完成对这种机制的调用

2：事务的ACID

1、原子性：一起成功一起失败

2、一致性：与实际发生相一致

3、隔离性：事务之间不可以相互访问

4、持久性：持久到数据库

3：如何来控制事务

这里我们先不考虑Spring

JDBC控制事务

Connection.setAutoCommit(false)开启事务

ConnectIon.commit()提交事务

Connection.rollback()回滚事务

其核心就是控制Connection链接对象来控制事务

Mybatis控制事务

Mybatis自动开启事务

sqlSession.commit()提交事务

sqlSession.rollback()回滚事务

总结：开启-提交-回滚

Mybatis底层的SqlSession底层也是封装的Connection，底层也是调用的是Connection.commit，不论是当前的jdbc还是Mybatis当中的sqlSession还是将来的jta，底层都是调用的Connection.commit，封装的都是COnnection对象，所有的技术，我们看到

的表象是不一样的，但是底层都是一样的，以上的都是不讨论Spring的事务控制的前提下。**

二：Spring控制事务开发

1：开发步骤

事务是业务开发过程中的额外功能，因为是额外功能所以我们可以采用Aop的方式来进行开发，Spring当中的事务是通过Aop的方式来进行控制事务开发的

(一)：原始对象

（1）这里的原始对象就是XXXUserServiceImpl中的方法，核心功能（业务功能+Dao的调用）

（2）我们要把Dao作为Service的成员边量，通过Spring的方式进行依赖注入的方式进行赋值，并为他提供get、set方法。

(二)：额外功能

（1）第一种实现MethodInterceptor，在里面的invoke方法中调用原始对象原始方法，并进行额外功能编写，如果原始方法抛出异常，我们就进行事务的回滚。

（2）@Aspect @Around这种方式呢实现原理是一样的，我们可以把开启提交回滚的代码写在额外功能当中，所以Spring也会写，所以呢，Spring框架就直接把这个代码给写了，给分装好了，我们直接用即可，那我们在org.springframework.jdbc.datasourceDataSourceTransactionManager这里边把这个给封装好了，这里边就是事务控制的额外功能，只需要用好这个类就行，要想这个类起作用，就需要在额外功能中对这个连接对象的支持和配合，所以说DataSourceTranSactionManager依赖连接对象，我们需要给她注入连接，但是我们现在引入了连接池，现在呢连接来自于连接池，所以把连接池注入给她即可，这样这个类就可以基于连接池对象完成对事物的控制。在这里我们需要注意两个要点，第一个代码不用我们写了，Spring已经帮我们写好了，第二个要点，我们是用Spring进行实物控制的时候需要为这个类注入连接池对象，有了连接池对象就等效于有了链接，就可以控制事务了。

(三)：切入点

@Transactionl就可以控制事务了。应用这个注解就可以给业务方法加入事务控制了。

1、用在类上：类中所有方法都会加入事务

2、用在方法上：这个方法会加入事务

(四)：组装切面

切面一定是有两个部分组成的，切入点+额外功能。在Spring进行实物控制的时候，他的组装切面的时候是通过标签来控制的，在标签当中会体现这两个元素。

这个属性适用于获取额外功能，切入点他自己会直接扫描注解来组装注解信息，引入这个标签我们就组装好了事务的切面

三：Spring控制事务的编码

1：搭建开发环境

引入相应的jar包，Spring引入事务控制的时候，他有开发了一个jar包需要我们引入进来，Spring-tx，引入这个jar包就把Spring与事务整合的Jar包引入了进来

        
            org.springframework
            spring-tx
            5.1.14.RELEASE

2：原始对象和切入点

package com.dashu.service;
import com.dashu.Dao.UserDao;
import com.dashu.entity.User;
import org.springframework.transaction.annotation.Transactional;
/**
 * @Auther: DaShu
 * @Date: 2021/7/26 22:36
 * @Description:
 */
/*定义切入点*/
@Transactional
public class UserServiceImpl implements UserService{
    private UserDao userDao;
    public UserDao getUserDao() {
        return userDao;
    }
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }
    public void register(User user) {
        userDao.save(user);
    }
}

3：额外功能和切面组装

4：测试Spring事务处理

   @Test
    public void test2(){
        ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");
        UserService userService = (UserService) ctx.getBean("userService");
        User user = new User();
        user.setName("张晓哎");
        user.setAge(21);
        userService.register(user);
        
    }

5：测试结果打印

2021-07-26 22:54:34 DEBUG ClassPathXmlApplicationContext:590 - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@66d33a
2021-07-26 22:54:34 DEBUG XmlBeanDefinitionReader:396 - Loaded 10 bean definitions from class path resource [applicationContext.xml]
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'scanner'
2021-07-26 22:54:34 DEBUG LogFactory:135 - Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter.
2021-07-26 22:54:34 DEBUG ClassPathMapperScanner:437 - Identified candidate component class: file [D:\giteesource\jdbc\spring-mybatis\target\classes\com\dashu\dao\UserDao.class]
2021-07-26 22:54:34 DEBUG ClassPathMapperScanner:49 - Creating MapperFactoryBean with name 'userDao' and 'com.dashu.Dao.UserDao' mapperInterface
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.transaction.config.internalTransactionalEventListenerFactory'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.aop.config.internalAutoProxyCreator'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'dataSource'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0'
2021-07-26 22:54:34 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'sqlSessionFactoryBean'
2021-07-26 22:54:34 DEBUG SqlSessionFactoryBean:49 - Property 'configuration' or 'configLocation' not specified, using default MyBatis Configuration
2021-07-26 22:54:35 DEBUG SqlSessionFactoryBean:49 - Parsed mapper file: 'file [D:\giteesource\jdbc\spring-mybatis\target\classes\com.dashu.mapper\UserDaoMapper.xml]'
2021-07-26 22:54:35 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'userService'
2021-07-26 22:54:35 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'userDao'
2021-07-26 22:54:35 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'dataSourceTransactionManager'
2021-07-26 22:54:35 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.transaction.interceptor.TransactionInterceptor#0'
2021-07-26 22:54:35 DEBUG DataSourceTransactionManager:372 - Creating new transaction with name [com.dashu.service.UserServiceImpl.register]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
2021-07-26 22:54:35 INFO  DruidDataSource:1003 - {dataSource-1} inited
2021-07-26 22:54:35 DEBUG DataSourceTransactionManager:265 - Acquired Connection [com.mysql.jdbc.JDBC4Connection@273444fe] for JDBC transaction
2021-07-26 22:54:35 DEBUG DataSourceTransactionManager:282 - Switching JDBC Connection [com.mysql.jdbc.JDBC4Connection@273444fe] to manual commit
2021-07-26 22:54:35 DEBUG SqlSessionUtils:49 - Creating a new SqlSession
2021-07-26 22:54:35 DEBUG SqlSessionUtils:49 - Registering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1972e513]
2021-07-26 22:54:35 DEBUG SpringManagedTransaction:49 - JDBC Connection [com.mysql.jdbc.JDBC4Connection@273444fe] will be managed by Spring
2021-07-26 22:54:35 DEBUG save:159 - ==>  Preparing: Insert into tree (name,age) values (?,?) 
2021-07-26 22:54:35 DEBUG save:159 - ==> Parameters: 张晓哎(String), 21(Integer)
2021-07-26 22:54:35 DEBUG save:159 - <==    Updates: 1
2021-07-26 22:54:35 DEBUG SqlSessionUtils:49 - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1972e513]
2021-07-26 22:54:35 DEBUG SqlSessionUtils:49 - Transaction synchronization committing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1972e513]
2021-07-26 22:54:35 DEBUG SqlSessionUtils:49 - Transaction synchronization deregistering SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1972e513]
2021-07-26 22:54:35 DEBUG SqlSessionUtils:49 - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1972e513]
2021-07-26 22:54:35 DEBUG DataSourceTransactionManager:743 - Initiating transaction commit
2021-07-26 22:54:35 DEBUG DataSourceTransactionManager:327 - Committing JDBC transaction on Connection [com.mysql.jdbc.JDBC4Connection@273444fe]
2021-07-26 22:54:36 DEBUG DataSourceTransactionManager:385 - Releasing JDBC Connection [com.mysql.jdbc.JDBC4Connection@273444fe] after transaction

6：事务编码细节

上述测试实例并不能证明事务加进来了，因为原有逻辑可以完成插入操作的，事务加上没有一定是加上了，以下是验证细节

package com.dashu.service;
import com.dashu.Dao.UserDao;
import com.dashu.entity.User;
import org.springframework.transaction.annotation.Transactional;
/**
 * @Auther: DaShu
 * @Date: 2021/7/26 22:36
 * @Description:
 */
/*定义切入点*/
@Transactional
public class UserServiceImpl implements UserService{
    private UserDao userDao;
    public UserDao getUserDao() {
        return userDao;
    }
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }
    public void register(User user) {
        userDao.save(user);
        throw new RuntimeException("测试异常");
    }
}

D:\DevelopPackage\jdk8\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\DevelopPackage\idea\IntelliJ IDEA 2020.2.2\lib\idea_rt.jar=58943:D:\DevelopPackage\idea\IntelliJ IDEA 2020.2.2\bin" -Dfile.encoding=UTF-8 -classpath "D:\DevelopPackage\idea\IntelliJ IDEA 2020.2.2\lib\idea_rt.jar;D:\DevelopPackage\idea\IntelliJ IDEA 2020.2.2\plugins\junit\lib\junit5-rt.jar;D:\DevelopPackage\idea\IntelliJ IDEA 2020.2.2\plugins\junit\lib\junit-rt.jar;D:\DevelopPackage\jdk8\jre\lib\charsets.jar;D:\DevelopPackage\jdk8\jre\lib\deploy.jar;D:\DevelopPackage\jdk8\jre\lib\ext\access-bridge-64.jar;D:\DevelopPackage\jdk8\jre\lib\ext\cldrdata.jar;D:\DevelopPackage\jdk8\jre\lib\ext\dnsns.jar;D:\DevelopPackage\jdk8\jre\lib\ext\jaccess.jar;D:\DevelopPackage\jdk8\jre\lib\ext\jfxrt.jar;D:\DevelopPackage\jdk8\jre\lib\ext\localedata.jar;D:\DevelopPackage\jdk8\jre\lib\ext\nashorn.jar;D:\DevelopPackage\jdk8\jre\lib\ext\sunec.jar;D:\DevelopPackage\jdk8\jre\lib\ext\sunjce_provider.jar;D:\DevelopPackage\jdk8\jre\lib\ext\sunmscapi.jar;D:\DevelopPackage\jdk8\jre\lib\ext\sunpkcs11.jar;D:\DevelopPackage\jdk8\jre\lib\ext\zipfs.jar;D:\DevelopPackage\jdk8\jre\lib\javaws.jar;D:\DevelopPackage\jdk8\jre\lib\jce.jar;D:\DevelopPackage\jdk8\jre\lib\jfr.jar;D:\DevelopPackage\jdk8\jre\lib\jfxswt.jar;D:\DevelopPackage\jdk8\jre\lib\jsse.jar;D:\DevelopPackage\jdk8\jre\lib\management-agent.jar;D:\DevelopPackage\jdk8\jre\lib\plugin.jar;D:\DevelopPackage\jdk8\jre\lib\resources.jar;D:\DevelopPackage\jdk8\jre\lib\rt.jar;D:\giteesource\jdbc\spring-mybatis\target\classes;D:\DevelopPackage\repository\junit\junit\4.12\junit-4.12.jar;D:\DevelopPackage\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;D:\DevelopPackage\repository\com\alibaba\druid\1.1.18\druid-1.1.18.jar;D:\DevelopPackage\repository\mysql\mysql-connector-java\5.1.48\mysql-connector-java-5.1.48.jar;D:\DevelopPackage\repository\org\mybatis\mybatis\3.4.6\mybatis-3.4.6.jar;D:\DevelopPackage\repository\org\springframework\spring-jdbc\5.1.14.RELEASE\spring-jdbc-5.1.14.RELEASE.jar;D:\DevelopPackage\repository\org\springframework\spring-beans\5.1.14.RELEASE\spring-beans-5.1.14.RELEASE.jar;D:\DevelopPackage\repository\org\springframework\spring-core\5.1.14.RELEASE\spring-core-5.1.14.RELEASE.jar;D:\DevelopPackage\repository\org\springframework\spring-jcl\5.1.14.RELEASE\spring-jcl-5.1.14.RELEASE.jar;D:\DevelopPackage\repository\org\springframework\spring-tx\5.1.14.RELEASE\spring-tx-5.1.14.RELEASE.jar;D:\DevelopPackage\repository\org\springframework\spring-context\5.1.4.RELEASE\spring-context-5.1.4.RELEASE.jar;D:\DevelopPackage\repository\org\springframework\spring-aop\5.1.4.RELEASE\spring-aop-5.1.4.RELEASE.jar;D:\DevelopPackage\repository\org\springframework\spring-expression\5.1.4.RELEASE\spring-expression-5.1.4.RELEASE.jar;D:\DevelopPackage\repository\org\mybatis\mybatis-spring\2.0.2\mybatis-spring-2.0.2.jar;D:\DevelopPackage\repository\org\slf4j\slf4j-log4j12\1.7.25\slf4j-log4j12-1.7.25.jar;D:\DevelopPackage\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;D:\DevelopPackage\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 com.dashu.test.TestMybatisSpring,test2 2021-07-26 23:00:29 DEBUG ClassPathXmlApplicationContext:590 - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@66d33a 2021-07-26 23:00:29 DEBUG XmlBeanDefinitionReader:396 - Loaded 10 bean definitions from class path resource [applicationContext.xml] 2021-07-26 23:00:29 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'scanner' 2021-07-26 23:00:29 DEBUG LogFactory:135 - Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter. 2021-07-26 23:00:29 DEBUG ClassPathMapperScanner:437 - Identified candidate component class: file [D:\giteesource\jdbc\spring-mybatis\target\classes\com\dashu\dao\UserDao.class] 2021-07-26 23:00:29 DEBUG ClassPathMapperScanner:49 - Creating MapperFactoryBean with name 'userDao' and 'com.dashu.Dao.UserDao' mapperInterface 2021-07-26 23:00:29 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor' 2021-07-26 23:00:29 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor' 2021-07-26 23:00:29 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.transaction.config.internalTransactionalEventListenerFactory' 2021-07-26 23:00:29 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.aop.config.internalAutoProxyCreator' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'dataSource' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'sqlSessionFactoryBean' 2021-07-26 23:00:30 DEBUG SqlSessionFactoryBean:49 - Property 'configuration' or 'configLocation' not specified, using default MyBatis Configuration 2021-07-26 23:00:30 DEBUG SqlSessionFactoryBean:49 - Parsed mapper file: 'file [D:\giteesource\jdbc\spring-mybatis\target\classes\com.dashu.mapper\UserDaoMapper.xml]' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'userService' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'userDao' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'dataSourceTransactionManager' 2021-07-26 23:00:30 DEBUG DefaultListableBeanFactory:213 - Creating shared instance of singleton bean 'org.springframework.transaction.interceptor.TransactionInterceptor#0' 2021-07-26 23:00:30 DEBUG DataSourceTransactionManager:372 - Creating new transaction with name [com.dashu.service.UserServiceImpl.register]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT 2021-07-26 23:00:30 INFO DruidDataSource:1003 - {dataSource-1} inited 2021-07-26 23:00:31 DEBUG DataSourceTransactionManager:265 - Acquired Connection [com.mysql.jdbc.JDBC4Connection@273444fe] for JDBC transaction 2021-07-26 23:00:31 DEBUG DataSourceTransactionManager:282 - Switching JDBC Connection [com.mysql.jdbc.JDBC4Connection@273444fe] to manual commit 2021-07-26 23:00:31 DEBUG SqlSessionUtils:49 - Creating a new SqlSession 2021-07-26 23:00:31 DEBUG SqlSessionUtils:49 - Registering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1972e513] 2021-07-26 23:00:31 DEBUG SpringManagedTransaction:49 - JDBC Connection [com.mysql.jdbc.JDBC4Connection@273444fe] will be managed by Spring 2021-07-26 23:00:31 DEBUG save:159 - ==> Preparing: Insert into tree (name,age) values (?,?) 2021-07-26 23:00:31 DEBUG save:159 - ==> Parameters: xi(String), 21(Integer) 2021-07-26 23:00:31 DEBUG save:159 - <== Updates: 1 2021-07-26 23:00:31 DEBUG SqlSessionUtils:49 - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1972e513] 2021-07-26 23:00:31 DEBUG SqlSessionUtils:49 - Transaction synchronization deregistering SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1972e513] 2021-07-26 23:00:31 DEBUG SqlSessionUtils:49 - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1972e513] 2021-07-26 23:00:31 DEBUG DataSourceTransactionManager:836 - Initiating transaction rollback 2021-07-26 23:00:31 DEBUG DataSourceTransactionManager:342 - Rolling back JDBC transaction on Connection [com.mysql.jdbc.JDBC4Connection@273444fe] 2021-07-26 23:00:31 DEBUG DataSourceTransactionManager:385 - Releasing JDBC Connection [com.mysql.jdbc.JDBC4Connection@273444fe] after transaction java.lang.RuntimeException: 测试异常 at com.dashu.service.UserServiceImpl.register(UserServiceImpl.java:28) 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:343) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) at com.sun.proxy.$Proxy18.register(Unknown Source) at com.dashu.test.TestMybatisSpring.test2(TestMybatisSpring.java:35) 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.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner.run(ParentRunner.java:290) at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access

0(ParentRunner.java:58) at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53) Process finished with exit code -1

第二个细节，是 --proxy-target-这是默认属性，默认是false，可以设置成true,设置成true就是使用cglib动态代理。

完成动态代理底层的切换

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