浅谈SpringMVC

SpringMVC

1、什么是SpringMVC

Spring Web MVC是基于Servlet API构建的原始Web框架，从一开始就已包含在Spring框架中。正式名称“ Spring Web MVC”来自其源模块（spring-webmvc）的名称，但更通常称为“ Spring MVC”。

2、SpringMVC做什么的？

代替Servlet完成控制器工作

3、SpringMVC的第一个案例

1、导包

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.3.1</version>
</dependency>

2、配置DispatcherServlet

<servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

3、编写springmvc.xml

<?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:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="com.blb"/>

</beans>

4、编写Controller（理解为Servlet）

@Controller
public class DemoController {

    @ResponseBody
    @RequestMapping("demo")
    public String demo(){
        return "hello springmvc";
    }
}

5、配置tomcat并启动

6、访问http://localhost:8080/demo