配置WEB.XML的配置文件过程中发现：
直接红叉，鼠标放在红叉出信息如下：
cvc-complex-type.2.4.a: Invalid content was found starting with element 'init-param'. One of '{"http://
java.sun.com/xml/ns/javaee":enabled, "http://java.sun.com/xml/ns/javaee":async-supported, "http://
java.sun.com/xml/ns/javaee":run-as, "http://java.sun.com/xml/ns/javaee":security-role-ref, "http://
java.sun.com/xml/ns/javaee":multipart-config}' is expected.
将 <load-on-startup>1</load-on-startup>放在init-param下面，红叉消失：
