SpringMCV Introduce ：

Spring MVC It's based on Java Realized. MVC Design pattern request driven type lightweight Web frame , That is to use MVC The idea of architecture pattern , take web Layer to decouple responsibilities , Based on request driven , That is to use the request - Response model , The goal of the framework is to help us simplify development

MVC Pattern ：

MVC  The framework provides the model - View - Control architecture and can be used to develop flexible 、 Loosely coupled  web  Components of the application .MVC  Patterns lead to different aspects of the application ( Input logic 、 Business logic and  UI  Logic ) The separation of , It also provides loose coupling between these elements .

Model Model

Encapsulates application data , And usually they are made up of POJO form .

View View

Mainly used to present model data , And usually it generates what the client's browser can interpret HTML Output .

controller Controller

It is mainly used to process user requests , And build the appropriate model and pass it to the view rendering .

What are the frameworks of the control layer ：

Struts 1.0 1.1

Spring mvc

Struts2   be based on webwork

In terms of performance ：

Jsp+servlet > struts1.1 > spring mvc > struts2

establish demo

1 , Create a dynamic web engineering .

2 , Join in Jar package .

3 ,   stay web.xml Middle configuration DispatcherServlet.

4 ,   Join in Spring MVC Configuration file for .

5 , The processor that writes the request , And marked as processor .

6, Authoring views .

create profile ：springmvc.xml 

2、 Selective dependency ：mvc、contxet、aop（ See what you need ）

end ： The specific content

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">

<!-- Scanning package -->
<context:component-scan base-package="com.jd.springmvc"></context:component-scan>

<!-- view resolver -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"></property> --- Match under which address
<property name="suffix" value=".jsp"></property> --- suffix
</bean>

</beans>

stay web.xml Middle configuration DispatcherServlet： Front controller

<!-- register springmvc -->
<servlet>
<servlet-name>bookstore</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:Spring-mvc.xml</param-value>---spring Lu Jin
</init-param>
<load-on-startup>1</load-on-startup>---- in 1 The value of 1,2,3,4,5 It means that the lower the value of the priority positive number is , The servlet The higher the priority , The more the app is loaded at startup
</servlet>
<servlet-mapping>
<servlet-name>bookstore</servlet-name>
<url-pattern>/</url-pattern>--- Filter all requests
</servlet-mapping>

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