Struts 2 SYSTEM INTRODUCTION

The system of Struts 2 differs greatly from that of Struts 1 because Struts2 uses the design core of WebWork, rather than Struts1. Struts2 uses a large number of interceptors to process user requests, allowing the user's business logic controller to be separated from the Servlet API.

The general process of Struts 2 framework is as follows.

(1) The browser sends requests, such as/mypage. action,/reports/myreporttables.

(2) The core controller FilterDispatcher decides to call the appropriate Action based on the request.

(3) the interceptor chain of Struts 2 automatically applies common functions to requests, such as workflow, validation, and file upload.

(4) The execute method of the callback Action. The execute method first obtains the user request parameters and then performs a database operation to save the data to the database or retrieve information from the database. In fact, because Action is only a controller, it calls the business logic component to process user requests.

(5) The result information of Action's execute method will be output to the browser, which can be HTML pages, images, PDF documents, or other documents. In this case, many view technologies are supported, including JSP and template technologies such as Velocity and FreeMarker.

 

Reproduced in: http://tech.hexun.com/2009-05-27/118118544.html