初识springMVC

HelloSpringMVC配置版：

1. 新建一个Moudle ， springmvc-02-hello ， 添加web的支持！

2. 确定导入了SpringMVC 的依赖！

3. 配置web.xml ， 注册DispatcherServlet

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
         version="5.0">

    
    <servlet>
        <servlet-name>springmvcservlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
    
    <init-param>
        <param-name>contextConfigLocationparam-name>
        <param-value>classpath:springmvc-servlet.xmlparam-value>
    init-param>
    
    <load-on-startup>1load-on-startup>
servlet>
        
        
    <servlet-mapping>
        <servlet-name>springmvcservlet-name>
        <url-pattern>/url-pattern>
    servlet-mapping>


web-app>

4. 编写SpringMVC 的 配置文件！名称：springmvc-servlet.xml : [servletname]-servlet.xml 说明，这里的名称要求是按照官方来的

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

5. 添加 处理映射器

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

6. 添加 处理器适配器

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

7. 添加 视图解析器

<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="InternalResourceViewResolver">

<property name="prefix" value="/WEB-INF/jsp/"/>

<property name="suffix" value=".jsp"/>
bean>

8. 编写我们要操作业务Controller ，要么实现Controller接口，要么增加注解；需要返回一个 ModelAndView，装数据，封视图；

package com.kuang.controller;


import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class HelloController implements Controller {
    public ModelAndView handleRequest(HttpServletRequest request,
                                      HttpServletResponse response) throws Exception {
//ModelAndView 模型和视图
        ModelAndView mv = new ModelAndView();
//封装对象，放在ModelAndView中。Model
        mv.addObject("msg","HelloSpringMVC!");
//封装要跳转的视图，放在ModelAndView中
        mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jsp
        return mv;
    }

}

9. 将自己的类交给SpringIOC容器，注册bean

<bean id="/hello" class="com.kuang.controller.HelloController"/>

10. 写要跳转的jsp页面，显示ModelandView存放的数据，以及我们的正常页面；

<%--
  Created by IntelliJ IDEA.
  User: 临易
  Date: 2022/2/17
  Time: 11:42
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$KuangShen$title>
  head>
  <body>
  $msg$
  body>
html>

11. 配置Tomcat 启动测试！