Springmvc:(二)第一个程序

一、创建流程

1. 创建maven项目，添加web支持

2. 导入spring-webmvc依赖

3. 解决maven静态资源过滤的问题

       <build>
           <resources>
               <resource>
                   <directory>src/main/java</directory>
                   <includes>
                       <include>**/*.properties</include>
                       <include>**/*.xml</include>
                   </includes>
                   <filtering>false</filtering>
               </resource>
               <resource>
                   <directory>src/main/resources</directory>
                   <includes>
                       <include>**/*.properties</include>
                       <include>**/*.xml</include>
                   </includes>
                   <filtering>false</filtering>
               </resource>
           </resources>
       </build>
   

4. File---Project Structure---Artifacts-----WEB-INF----右键新建lib文件夹----单击加号，添加jar包

5. 编写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>
           <!--关联springMVC配置-->
           <init-param>
               <param-name>contextConfigLocation</param-name>
               <param-value>classpath:springmvc.xml</param-value>
           </init-param>
           <!--执行优先级顺序-->
           <load-on-startup>1</load-on-startup>
       </servlet>
       <servlet-mapping>
           <servlet-name>springmvc</servlet-name>
           <url-pattern>/</url-pattern>
       </servlet-mapping>
   </web-app>
   

6. 创建springmvc.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"
          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-->
       <context:component-scan base-package="com.ruanyuan.Controller"/>
       <!-- 让Spring MVC不处理静态资源 js、css、img -->
       <mvc:default-servlet-handler/>
       <!--注册默认梳理请求，返回值，参数的类-->
       <mvc:annotation-driven/>
       <!--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>
   </beans>
   

7. 创建HelloController

   package com.ruanyuan.Controller;
   
   import org.springframework.stereotype.Controller;
   import org.springframework.ui.Model;
   import org.springframework.web.bind.annotation.RequestMapping;
   import org.springframework.web.servlet.ModelAndView;
   
   import java.lang.annotation.Annotation;
   
   @Controller
   @RequestMapping("/HelloController")
   public class HelloController {
   
       //真实访问地址 : 项目名/HelloController/hello
       @RequestMapping("/hello")
       public String sayHello(Model model) {
           //向模型中添加属性msg与值，可以在JSP页面中取出并渲染
           model.addAttribute("msg", "hello,SpringMVC");
           //web-inf/jsp/hello.jsp
           return "hello";
       }
   }
   

8. 创建hello.jsp

   <%--
     Created by IntelliJ IDEA.
     User: zbp
     Date: 2020/3/3
     Time: 15:35
     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>
   
   

9. 执行结果

二、拓展

1. 解决中文乱码问题

   <!-- 配置过滤器，解决中文乱码的问题 -->
   <filter>
   	<filter-name>characterEncodingFilter</filter-name>
   	<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-
   class>
   <!-- 指定字符集 -->
   <init-param>
   	<param-name>encoding</param-name>
   	<param-value>UTF-8</param-value>
   </init-param>
   </filter>
   	<filter-mapping>
   	<filter-name>characterEncodingFilter</filter-name>
   	<url-pattern>/*</url-pattern>
   </filter-mapping>