Document root elements “excel“,must match doctype root “null“-问题解决

Document root elements "excel",must match doctype root "null"

document is invalid:no gramar found

1.出问题的文档

<?xml version="1.0" encoding="UTF-8"?>
<excel>
</excel>

2.解决办法 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<excel>
</excel>

3.因为在struts.xml文件中缺少了DOCTYPE定义，在文件中加入DOCTYPE 就可以了