第一个SpringMVC程序(注解实现)
Spring MVC 的核心包是：
- spring-web
- spring-webmvc
目录结构：
1、配置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">
<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:spring-mvc.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>
- 在上述
web.xml文件中主要配置了<servlet>和<servlet-mapping>。- 配置了前端控制器DispatcherServlet
- 绑定了springmvc配置文件的位置
load-on-startup元素中的 1 表示容器（Tomcat）在启动时立即加载这个 DispatcherServleturl-pattern元素的/，会对所有 URL 拦截（不包括 jsp / html 等），并交由 DispatcherServlet 处理
2、编写Spring mvc的配置文件
<?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
http://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">
<context:component-scan base-package="com.xu.controller"/><!--自动包扫描-->
<mvc:default-servlet-handler/><!--让spring不处理请求静态资源的请求-->
<mvc:annotation-driven/><!--代替了：HandlerMapping 和 HandlerAdapter-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/><!--前缀-->
<property name="suffix" value=".jsp"/><!--后缀-->
<!--到时候我们直接返回逻辑视图名就ok了！-->
</bean>
</beans>
3、编写视图(hello.jsp)
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page isELIgnored="false" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>第一个MVC程序(注解实现)</title>
</head>
<body>
<h1>${msg}</h1>
</body>
</html>
4、编写Controller
package com.xu.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloController {
@RequestMapping("/hello") //括号里写请求的路径
public String hellomvc1(Model model ){
model.addAttribute("msg","第一个Spring-MVC程序(注解实现)");
return "hello"; //直接返回视图名
}
