1.不正确引入springboot jstl的依赖包，可能会出现如下错误
The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application
2.在pom.xml中添加jstl的依赖包即可
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
3.更新maven即可
