使用注解开发

1.注册一个DispatcnerServlet

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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <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-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

特别的配置：

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<init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:SpringMVC-servlet.xml</param-value>
        </init-param>

初始化，就是配置文件的位置；

2.配置注解支持和数据处理，视图解析

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<?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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!-- more bean definitions go here -->
    <mvc:annotation-driven/>
    <mvc:default-servlet-handler/>
    <context:component-scan base-package="com.saxon.controller"/>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver" >
        <property name="suffix" value=".jsp"/>
        <property name="prefix" value="/JSP/"/>
     </bean>
</beans>

mvc:annotation-driven:就是两个的注释 

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<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

mvc:default-servlet-handler:是否过滤静态资源；这样的话，静态请求（css,html,js）就不会走这里；

context:component-scan扫描这个包下的所有的controller；

internalResourceViewResolve视图解析器，会根据你返回的值进行一个字符串的拼接；

3.编写一个controller使用注解@controller

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package com.saxon.controller;


import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class MyController {
    @RequestMapping ("/hello")//详相当于servletmappering
    public String hello (Model model) {
        model.addAttribute ("msg", "Hello Mr Mo");
        return "Hello";
    }

    @RequestMapping ("/hello1")//详相当于servletmappering
    public String hello1 (Model model) {
        model.addAttribute ("msg", "Hello Mr Mo 2");
        return "Hello";
    }
}

@Controller:表名是一个controller可以被spring托管

@RequestMapping：访问的地址；