BS structure: B / S structure is the browser and server architecture. In this structure, the user interface is implemented by WWW browser, business logic implemented in a very small part of the front end (Browser), but the main business logic on the server side (Server), a so-called three 3-tier structure.
J2EE SSI architecture: ssi is Struts2 + spring + ibatis ibatis which is commonly referred to data mapper, a data access tool.
Velocity: Velocity is a java template engine (template engine) based. It allows anyone to use just a simple template language (template language) to reference objects defined by the java code.
Reproduced in: https: //my.oschina.net/dminter/blog/205044