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插件安装
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搜索 tomcat 

The Tomcat plugin for Intellij IDEA
The SmartTomcat will auto load the Webapp classes and libs from project and module, 
You needn't copy the classes and libs to the WEB-INF/classes and WEB-INF/lib. 
The Smart Tomcat plugin will auto config the classpath for tomcat server. 
The Smart Tomcat support Tomcat 6+

https://plugins.jetbrains.com/plugin/9492-smart-tomcat

1.In Run/Debug, choose SmartTomcat
2.config the run/debug config
  Tomcat Server : config or choose tomcat server
  
  
  Deployment : choose the webapp folder, e.g. "src/main/webapp"
  Context Path : input the contextPath, e.g. "/mycontextpath" or /
  Server Port : input the server port, e.g. "8080"
  VM Options : input the vm options, e.g. "-DENV=DEV"
  
3.start run/debug

web例子项目 helloweb
https://gitee.com/dyyx/hellocode/tree/master/demo/helloweb

dbview测试ok