Springmvc Getting Started

1 MVC Pattern Review

Spring MVC is an MVC -based Web application framework.

MVC is a design pattern, the application of MVC in B/s system:

To perform the steps:

1. Request, request to c,c in MVC to receive the request and cannot process the request, need to give the request to M
2. The model is used to process the request, and all the things used to deal with it are models, Pojo,action,service,dao
3. After processing, the results are returned to C
4. c requires some good-looking, rendered pages to respond, which is used in the V view
5. The controller renders the view, populating the model data into the request domain
6. When the request is ready, you can response.

Note: The model cannot populate the view with the data under the B/s system

Contact with SPRINGMVC: controllers, models, views how are these implemented in spring?

2 Spring MVC Framework

To perform the steps:

1 initiating a request to the front segment controller (dispatcherservlet)

2 Front-end controller request Handlermapping Find handler can be found based on XML configuration, annotations

3 Processor Mapper Handlermapping back to the front-end controller Handler

4 Front-end controller calls the processor adapter to perform handler

5 Processor adapter to perform handler

6 Handler The adapter returns Modelandview after execution

7 Processor Adapter Return to front end controller Modelandview,modelandview is an underlying object of the SPRINGMVC framework, including model and view

8 Front-End controller requests the view resolver to parse the view and parse it into a real view (JSP) based on the logical view name

9 View resolver returns view to front Controller

10 front-end controller for view rendering, view rendering fills the model data (in the Modelandview object) to the request field

11 front-end controller responds to user results

3 SPRINGMVC Main components

1 Front-end controller Dispatcherservlet (no program development required)

Function: Receive request, response result, equivalent to transponder, CPU

Reduces the coupling between other components.

2 Processor Mapper handlermapping (no program development required)

Function: Find handler based on the URL requested

3 Processor Adapter Handleradapter (no program development required)

Function: Execute handler According to the specific rules (Handleradapter requirements)

4 Processor Handler ( requires program development )

Note: When writing handler, follow the handleradapter requirements so that the adapter can execute correctly handler

5 View Parser View resolver (no program development required)

Function: Perform a view resolution, resolve to a real view based on the logical View name (view)

6 views View ( requires programmer to develop JSP)

View is an interface that implements classes that support different view types

41 Simple SPRINGMVC Case 4.1 configuring a front-end controller

1   <!--Configuring the SPRINGMVC front-end controller -2   <servlet>3       <Servlet-name>Springmvc</Servlet-name>4       <Servlet-class>Org.springframework.web.servlet.DispatcherServlet</Servlet-class>5    <Init-param>6         <Param-name>Contextconfiglocation</Param-name>7         <Param-value>Classpath:/*-servlet.xml</Param-value>8     </Init-param>9     <Load-on-startup>1</Load-on-startup>Ten   </servlet> One    A   <servlet-mapping> -       <Servlet-name>Springmvc</Servlet-name> -        <Url-pattern>/</Url-pattern> the   </servlet-mapping>

4.2 Configuration Processor: Configurator

1 <!--  -2<class = " Org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter "/>

4.3 Configuration Processor: Mapper

1 <!--  - 2   <class= " Org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping "/>

4.4 Configuring the View resolver

1 <!--Viewresolver -2 <Beanclass= "Org.springframework.web.servlet.view.InternalResourceViewResolver">3   < Propertyname= "Viewclass"value= "Org.springframework.web.servlet.view.JstlView"/>4   < Propertyname= "prefix"value= "/web-inf/jsp/"/>5   < Propertyname= "suffix"value= ". jsp"/>6 </Bean>

4.5 Processor Writing

1 <!-- Handler  - 2 <  name= "/hello"  class= "Com.inspur.handler.HelloWorldController" />

Java Code

1  Public classHelloworldcontrollerImplementsController {2 @Override3      PublicModelandview HandleRequest (httpservletrequest request,4HttpServletResponse response)throwsException {5        //back to Modelandview6Modelandview mv =NewModelandview ();7        //setattribute equivalent to request, which takes data through a message in a JSP page8Mv.addobject ("message", "Hello world!");9        //sets the logical view name that the view resolver resolves to a specific view page based on that nameTenMv.setviewname ("Hello"); One        returnMV; A     } -}

4.6 jsp Writing

1 <%@ Page Language="Java"ContentType="text/html; Charset=utf-8"pageencoding="UTF-8"%>2${message}

4.7 Visits

Http://localhost:8080/springmvctfirst/hello

Springmvc Getting Started