SpringMVC详细内容（7）

阳光穿透心脏的1/2处 2023-09-24 20:12 63阅读 0赞

# 1.SpringMVC #

*  A Spring MVC is `a Java framework`which is used to `build web applications`.
 *  It follows the `Model-View-Controller` design pattern.
 *  It `implements` all the basic features of `a core spring framework`like `Inversion of Control`, `Dependency Injection`.
 *  A Spring MVC provides `an elegant solutio`n to use `MVC in spring framework`by the help of `DispatcherServlet`.
 *  `DispatcherServlet` is a class that receives the incoming request and maps it to the right resource such as`controllers, models, and views`.

## 1）Spring Web Model-View-Controller ##

![在这里插入图片描述][2514b4efc3014b3bbf094489757e4f2e.png]

*  `Model` \- A model contains the`data` of the application. A data can be a `single object or a collection of objects`.
 *  `Controller` \- A controller contains the `business logic` of an application. Here, the `@Controller annotation`is used to mark the class as the controller.
 *  `View` \- A view represents the `provided information` in a particular format. Generally, JSP+JSTL is used to create a view page. Although spring also supports other view technologies such as Apache Velocity, Thymeleaf and FreeMarker.
 *  `Front Controller` \- In Spring Web MVC, the `DispatcherServlet` class works as `the front controller`. It is responsible to manage the flow of the Spring MVC application.

## 2)the flow of Spring Web MVC ##

![在这里插入图片描述][5b6fa93bbfcc450796160cfedb2f21e7.png]

*  As displayed in the figure, `all the incoming request` is `intercepted` by the `DispatcherServlet` that works as `the front controller`.
 *  The `DispatcherServlet`gets an entry of `handler mapping` from the `XML file` and forwards the request to the controller.
 *  The `controller` returns an object of `ModelAndView`.
 *  The`DispatcherServlet` checks the entry of `view resolver` in the XML file and invokes the specified view component.

## 3)Advantages of Spring MVC Framework ##

*  `Separate roles`  
    The Spring MVC separates each role, where `the model object, controller, command object, view resolver, DispatcherServlet, validator`, etc. can be fulfilled by a specialized object.
 *  `Light-weight`  
    It uses light-weight servlet container to `develop` and `deploy` your application.
 *  `Powerful Configuration`  
    It provides `a robust configuration` for both framework and application classes that includes easy referencing across contexts, such as `from web controllers to business objects and validators`.
 *  `Rapid development`  
    The Spring MVC facilitates fast and parallel development.
 *  `Reusable business code`  
    Instead of creating new objects, it allows us to use the existing business objects.
 *  `Easy to test`  
    In Spring, generally we `create JavaBeans classes` that enable you to `inject test data using the setter method`.
 *  `Flexible Mapping`  
    It provides the specific annotations that easily `redirect the page`.

[2514b4efc3014b3bbf094489757e4f2e.png]: https://img-blog.csdnimg.cn/2514b4efc3014b3bbf094489757e4f2e.png
[5b6fa93bbfcc450796160cfedb2f21e7.png]: https://img-blog.csdnimg.cn/5b6fa93bbfcc450796160cfedb2f21e7.png