【Mybatis源码】XMLConfigBuilder构建器 - 加载XML与创建Configuration对象的过程

XMLConfigBuilder是Mybatis中定义的进行构建Configuration对象的类，此类用于读取XML配置文件创建并初始化Configuration对象；本篇我们主要介绍加载XML文件与创建Configuration对象的过程。

一、Configuration对象的创建过程

下面是从Configuration类中取到的代码片段：

public class Configuration {
protected Properties variables = new Properties();
  protected final TypeHandlerRegistry typeHandlerRegistry = new TypeHandlerRegistry();
  protected final TypeAliasRegistry typeAliasRegistry = new TypeAliasRegistry();
  protected final LanguageDriverRegistry languageRegistry = new LanguageDriverRegistry();
  public Configuration() {
    typeAliasRegistry.registerAlias("JDBC", JdbcTransactionFactory.class);
    typeAliasRegistry.registerAlias("MANAGED", ManagedTransactionFactory.class);

    typeAliasRegistry.registerAlias("JNDI",