idea ----- idea of "can not resolve symbol servlet" solution

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The first time you use IntelliJ IDEA I have a problem "can not resolve symbol servlet", the reason for this problem is the lack of servlet-api.jar package caused.
Solution:

1. Check tomcat package is configured servlet-api.jar
   steps: run-> edit Configuration-> tomcat server- > Unnamed-> configure

   2. Right Item -> open module setting, as shown in FIG.

3.libraries-> + -> Java-> select the path (Tomcat installation directory lib-> tomcat-api.jar)

After completing the no can not resolve symbol servlet tips mistake