SqlSessionFactory sqlMapper =new SqlSessionFactoryBuild...
A.主要就涉及到了三个类SqlSessionFactoryBuilder、XMLConfigBuilder、XPathParser
B.Build方法首先都是用XML配置文件构建一个XMLConfigBuilder类,XMLConfigBuilder通过parse方法返回一个Configuration配置类
C.Configuration设置到SqlSessionFactory默认实现DefaultSqlSessionFactory的configuration属性并返回
D.创建SqlSessionFactory对象是通过SqlSessionFactoryBuilder的build方法,他会返回它的默认实现类SqlSessionFactory