common java technology example urls

Spring mvc examlpe:

http://www.mkyong.com/spring-mvc/gradle-spring-mvc-web-project-example/

MyBatis example:

https://www.javacodegeeks.com/2012/11/mybatis-tutorial-crud-operations-and-mapping-relationships-part-1.html

Web Socket:

https://www.cnblogs.com/akanairen/p/5616351.html