eclipse使用问题记录

运行java ee项目时候报错：
The server cannot be started because one or more of the ports are invalid. Open the server editor and correct the invalid ports.
解决方案：
修改shutdown端口号

参考链接

https://blog.csdn.net/qq_43290288/article/details/102693127

Eclipse切换成package explorer
windows=》show views=》package explorer
Top Level Elements=》Working Sets

设置字体大小
https://jingyan.baidu.com/article/546ae185f6e87e1149f28c1c.html

The superclass “javax.servlet.http.HttpServlet” was not found on the Java
https://www.cnblogs.com/theWinter/p/10743401.html