创建xml的时候没有这句代码，加上这串代码就可以了
<?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">
Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 40; 文档根元素 "mapper" 必须匹配 DOCTYPE 根 "null"
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Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber
Caused by: org.xml.sax.SAXParseException; lineNumber: 4; columnNumber: 134; 文档根元素 "beans" 必须匹配 DOCTYPE 根 "null"，解决方案
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