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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",