SpringMVC 学习（二）Hello SpringMVC

3. Hello SpringMVC

(1) 新建 maven 模块

springmvc-02-hellomvc

(2) 确认依赖的导入

在这里插入图片描述

(3) 配置 web.xml

<!--web/WEB-INF/web.xml-->
<?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"><!--1.注册DispatcherServlet--><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!--关联一个springmvc的配置文件:【servlet-name】-servlet.xml--><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc-servlet.xml</param-value></init-param><!--启动级别-1：与服务器同时启动--><load-on-startup>1</load-on-startup></servlet><!--/ 匹配所有的请求；（不包括.jsp）--><!--/* 匹配所有的请求；（包括.jsp）--><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>/</url-pattern></servlet-mapping>
</web-app>

(4) 编写 springmvc 配置文件

<!--resources/springmvc-servlet.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"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>

(5) 添加处理映射器

<!--resources/springmvc-servlet.xml-->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>

(6) 添加处理适配器

<!--resources/springmvc-servlet.xml-->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

(7) 添加视图解析器

<!--resources/springmvc-servlet.xml-->
<!--视图解析器:DispatcherServlet给他的ModelAndView-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver"><!--前缀--><property name="prefix" value="/WEB-INF/jsp/"/><!--后缀--><property name="suffix" value=".jsp"/>
</bean>

(8) 编写 Controller

// com/why/controller/HelloController
package com.why.controller;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//注意：这里我们先导入Controller接口
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。Modelmv.addObject("msg","HelloSpringMVC!");//封装要跳转的视图，放在ModelAndView中mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jspreturn mv;}
}

(9) 注册 Controller

<!--resources/springmvc-servlet.xml-->
<!--Handler-->
<bean id="/hello" class="com.why.controller.HelloController"/>

(10) 跳转 jsp 页面

<!--web/WEB-INF/jsp/hello.jsp-->
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Kuangshen</title>
</head>
<body>${msg}
</body>
</html>