Hierarchical Java Web Development

Jsp: data page rendering, collection of client data Servlet: accept user data, call the business, accept data from the business, jump to the business: accept the data transmitted by the servlet, PASS Parameters to get data, process business rules and accept Dao data

Dao: receives business data, operates databases, and transmits the data to the business.

Tomcat: a jsp and servlet container, responsible for instantiating and calling jsp and servlet

	Commonality	Non-commonality
Jsp	Single class single object	The Code does not need to be compiled or configured. It is a java code snippet.
Servlet		Need to be compiled, is a complete Class

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