ssm框架的项目，使用maven管理，启动服务器报错

异常信息：

java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener

解决办法：

Open the project's properties (e.g., right-click on the project's name in the project explorer and select "Properties").

Select "Deployment Assembly".

Click the "Add..." button on the right margin.

Select "Java Build Path Entries" from the menu of Directive Type and click "Next".

Select "Maven Dependencies" from the Java Build Path Entries menu and click "Finish".