Java-JSP & JavaBean

According to the general development mode, web applications can be divided into three layers: web layer, business layer, and data access layer. That is to say, the MVC (model, view, control) mode.

In this mode, JSP is only responsible for displaying data and dealing with client users. servlet is responsible for data collection and page forwarding.

Each page accessed by the user is forwarded by sevlet.

 

You must specify a bean for the from form on the JSP submission page to store data.
The data access layer must also specify a JavaBean for each type of data to decouple each level.

When Serlvet obtains form submission data, it first converts the request data to frombean. After a series of verification and other actions, it converts frombean into a database access bean.

// Copy webutils. copybean (formbean, user) of bean );