SpringMVC-第一个MVC程序的搭建需要

1.首先先创建一个maven项目SpringMVC 以便以后做的小案例都在这个项目里

2.在导入项目一些所需的jar包（pom.xml），有了这些jar包后面做的项目就不需要再次导了因为再创建的项目都是SpringMVC的子项目。

 <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
    </dependencies>

3.新建一个Moudle ， springmvc-01-test，添加web的支持，配置web.xml ，注册DispatcherServlet。

注意：刚创建的Moudle没有web 我们要调用出来

步骤：右击springmvc-01-test --->选择Add Frameworks Support-->

选中Web Application 右侧4.0版本 -->OK

此时web就生成了

<?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servlet-->
   <servlet>
       <servlet-name>SpringMVC</servlet-name>
       <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
       <!--通过初始化参数指定SpringMVC配置文件的位置，进行关联-->
       <init-param>
           <param-name>contextConfigLocation</param-name>
           <param-value>classpath:springmvc-servlet.xml</param-value>
       </init-param>
       <!-- 启动顺序，数字越小，启动越早 -->
       <load-on-startup>1</load-on-startup>
   </servlet>

   <!--所有请求都会被springmvc拦截 -->
   <servlet-mapping>
       <servlet-name>SpringMVC</servlet-name>
       <url-pattern>/</url-pattern>
   </servlet-mapping>

</web-app>

4.在resource上创建springmvc-servlet.xml文件并编写代码

<?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">

    <!-- 自动扫描包，让指定包下的注解生效,由IOC容器统一管理 -->
    <context:component-scan base-package="com.gao.controller"/>
    <!-- 让Spring MVC不处理静态资源 -->
    <mvc:default-servlet-handler />

    <mvc:annotation-driven />

    <!-- 视图解析器 -->
    <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>

        
</beans>

5.创建com.gao.controller包和ControllerTest1.class (这里采用的是注解版最为简便的一种方法减少了代码量)

package com.gao.controller;

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

@Controller
public class ControllerTest1 {

    @RequestMapping("/ts1")
    public String test1(Model model){
        model.addAttribute("msg","hello test1");
        return "test";
    }

}

6.在WEB-INF下创建jsp文件夹并在其中创建test.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020/5/7 0007
  Time: 15:32
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${msg}
</body>
</html>

7.配置配置Tomcat 启动测试

接下来我们把controllerTest1页面再添加一个方法 ts2 来观察一下

package com.gao.controller;

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

@Controller
public class ControllerTest2 {

    @RequestMapping("/ts1")
    public String test1(Model model){
        model.addAttribute("msg","hello test1");
        return "test";
    }

    @RequestMapping("/ts2")
    public String test2(Model model){
        model.addAttribute("msg","hello test2");
        return "test";
    }

}