遇到的问题
The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path index.jsp /SpringMVCHelloWorld/src/main/webapp
http://www.programcreek.com/2014/02/spring-mvc-helloworld-using-maven-in-eclipse/
sudo chmod 755 /Users/yifa007/Documents/Apps/apache-tomcat-8.5.4 * //授予执行权限
sudo sh /Users/yifa007/Documents/Apps/apache-tomcat-8.5.4/bin/startup.sh //必须加sh
sudo sh /Users/yifa007/Documents/Apps/apache-tomcat-8.5.4/bin/shutdown.sh //必须加sh