一. Spring集成web环境

1. 基本三层架构环境搭建

1.1 添加依赖

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>javax.servlet.jsp-api</artifactId>
    <version>2.2.1</version>
    <scope>provided</scope>
</dependency>

1.2 创建web层

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2. ApplicationContext应用上下文获取方式

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3. Spring提供获取应用上下文的工具

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4. 导入Spring集成web的坐标

这样就可以配置监听器了

<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-web</artifactId>
	<version>5.0.5.RELEASE</version>
</dependency>

5. 配置ContextLoaderListener监听器

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<!--全局参数-->
<context-param>
	<param-name>contextConfigLocation</param-name>
	<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!--Spring的监听器-->
<listener>
	<listener-class>
		org.springframework.web.context.ContextLoaderListener
	</listener-class>
</listener>

6. 通过工具获得应用上下文对象

public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
        ServletContext servletContext = this.getServletContext();
        ApplicationContext app = WebApplicationContextUtils.getWebApplicationContext(servletContext);
        UserService userService = app.getBean(UserService.class);
        userService.save();
    }
}

ApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
Object obj = applicationContext.getBean("id");

二. SpringMVC的简介

1. SpringMVC概述

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2. SpringMVC快速入门

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2.1 导入Spring和SpringMVC的坐标和Servlet和Jsp的坐标

<!--Spring坐标-->
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-context</artifactId>
	<version>5.0.5.RELEASE</version>
</dependency>
<!--SpringMVC坐标-->
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-webmvc</artifactId>
	<version>5.0.5.RELEASE</version>
</dependency>
<!--Servlet坐标-->
<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>servlet-api</artifactId>
	<version>2.5</version>
</dependency>
<!--Jsp坐标-->
<dependency>
	<groupId>javax.servlet.jsp</groupId>
	<artifactId>jsp-api</artifactId>
	<version>2.0</version>
</dependency>

2.2 在web.xml配置SpringMVC的核心控制器

<servlet>
	<servlet-name>DispatcherServlet</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>
	</init-param>
	<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
	<servlet-name>DispatcherServlet</servlet-name>
	<url-pattern>/</url-pattern>
</servlet-mapping>