mybatis配置文件头部声明

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mybatis 的配置文件顶部的申明，否则，启动时候报错org.xml.sax.SAXParseException; lineNumber: 4; columnNumber: 49; 文档根元素 "mapper" 必须匹配 DOCTYPE 根 "null"

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">