01_SpringMVC入门

张创琦

基础文件

pom.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <project xmlns="http://maven.apache.org/POM/4.0.0"
  3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5.     <modelVersion>4.0.0</modelVersion>
  7.     <groupId>com.kkb</groupId>
  8.     <artifactId>springmvc01</artifactId>
  9.     <version>1.0-SNAPSHOT</version>
  11.     <!-- web项目，需要引入war包 -->
  12.     <packaging>war</packaging>
  14.     <dependencies>
  15.         <dependency>
  16.             <groupId>org.springframework</groupId>
  17.             <artifactId>spring-webmvc</artifactId>
  18.             <version>5.2.13.RELEASE</version>
  19.         </dependency>
  20.         <dependency>
  21.             <groupId>javax.servlet</groupId>
  22.             <artifactId>javax.servlet-api</artifactId>
  23.             <version>4.0.1</version>
  24.             <!-- 不会运行上去 -->
  25.             <scope>provided</scope>
  26.         </dependency>
  27.     </dependencies>
  29.     <build>
  30.         <plugins>
  31.             <plugin>
  32.                 <groupId>org.apache.maven.plugins</groupId>
  33.                 <artifactId>maven-compiler-plugin</artifactId>
  34.                 <version>3.8.0</version>
  35.                 <configuration>
  36.                     <target>1.8</target>
  37.                     <source>1.8</source>
  38.                 </configuration>
  39.             </plugin>
  40.             <plugin>
  41.                 <groupId>org.apache.tomcat.maven</groupId>
  42.                 <artifactId>tomcat7-maven-plugin</artifactId>
  43.                 <version>2.2</version>
  44.                 <configuration>
  45.                     <path>/</path>
  46.                     <port>80</port>
  47.                 </configuration>
  48.             </plugin>
  49.         </plugins>
  50.     </build>
  52.     <properties>
  53.         <maven.compiler.source>8</maven.compiler.source>
  54.         <maven.compiler.target>8</maven.compiler.target>
  55.     </properties>
  57. </project>

applicationContext.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.        xmlns:context="http://www.springframework.org/schema/context"
  5.        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  6.     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
  8.     <!-- spring配置文件，除了控制器之外的bean对象都在这里扫描, model层 -->
  9.     <context:component-scan base-package="com.kkb.dao, com.kkb.service"/>
  11. </beans>

springmvc.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.        xmlns:context="http://www.springframework.org/schema/context"
  5.        xmlns:mvc="http://www.springframework.org/schema/mvc"
  6.        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  7.        http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
  8.        http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
  10.     <!-- springmvc的配置文件，控制器的bean对象都在这里扫描 -->
  11.     <context:component-scan base-package="com.kkb.controller"/>
  13.     <!--注解驱动-->
  14.     <mvc:annotation-driven/>
  15.     <!--视图解析器-->
  16.     <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  17.         <!--前缀-->
  18.         <property name="prefix" value="/jsp/"></property>
  19.         <!--后缀-->
  20.         <property name="suffix" value=".jsp"></property>
  21.     </bean>
  22. </beans>

TeamService.java

  1. package com.kkb.service;
  3. import org.springframework.stereotype.Service;
  5. @Service
  6. public class TeamService {
  7.     public void add(){
  8.         System.out.println("TeamService-----add--------");
  9.     }
  10. }

TeamController.java

  1. package com.kkb.controller;
  3. import com.kkb.service.TeamService;
  4. import org.springframework.beans.factory.annotation.Autowired;
  5. import org.springframework.stereotype.Controller;
  6. import org.springframework.web.bind.annotation.RequestMapping;
  7. import org.springframework.web.servlet.ModelAndView;
  9. @Controller
  10. public class TeamController {
  12.     @Autowired
  13.     public TeamService teamService;
  15.     //  /hello.do也可
  16.     @RequestMapping("hello.do")
  17.     public ModelAndView add(){
  18.         System.out.println("TeamController------add------");
  19.         teamService.add();
  20.         ModelAndView mv = new ModelAndView();
  21.         mv.addObject("teamName", "湖人队");  //相当于Request.setAttribute("","")
  22.         mv.setViewName("index");  //未来通过springmvc的视图解析器处理。转换成物理资源路径，相当于request.getRequestDispatcher("index.jsp").forward();
  23.         //经过InternalResourceViewResolver对象的处理之后加上前后缀就变成了 /jsp/index.jsp
  24.         return mv;
  25.     }
  27. }

web.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  5.          version="4.0">
  7.     <!-- Spring配置 -->
  8.     <context-param>
  9.         <param-name>contextConfigLocation</param-name>
  10.         <param-value>classpath:applicationContext.xml</param-value>
  11.     </context-param>
  13.     <listener>
  14.         <!-- ContextLoaderListener默认监听WEB-INF下面的applicationContext.xml文件，所以上面的spring配置必须写 -->
  15.         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  16.     </listener>
  18.     <!-- springmvc前端/核心/中央控制器 -->
  19.     <servlet>
  20.         <!-- 如果将servlet-name改为springmvc的话，那下面的mapping映射里的servlet-name也要改为springmvc，此时param-name找的是springmvc-servlet.xml -->
  21.         <servlet-name>dispatcherServlet</servlet-name>
  22.         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  23.         <init-param>
  24.             <param-name>contextConfigLocation</param-name> <!-- 会去找dispatcherServlet-servlet.xml -->
  25.             <param-value>classpath:springmvc.xml</param-value>
  26.         </init-param>
  27.         <!--没有写的话现用现创建，大于0的话表示立即创建对象，数字越小优先级越高，小于0的话不会立即创建对象 -->
  28.         <load-on-startup>1</load-on-startup>
  29.     </servlet>
  30.     <servlet-mapping>
  31.         <servlet-name>dispatcherServlet</servlet-name>
  32.         <url-pattern>*.do</url-pattern>
  33.     </servlet-mapping>
  35. </web-app>

index.jsp

  1. <%--
  2.   Created by IntelliJ IDEA.
  3.   User: DELL
  4.   Date: 2022/2/12
  5.   Time: 20:41
  6.   To change this template use File | Settings | File Templates.
  7. --%>
  8. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  9. <html>
  10. <head>
  11.     <title>index</title>
  12. </head>
  13. <body>
  14.     <h1>index----------${teamName}</h1>
  15. </body>
  16. </html>

说明：

1 整理创建web项目的流程（视频：SpringMVC入门程序）

2 JDK选择1.8

3 spring和springmvc版本号统一

5.2.13.RELEASE

4 springmvc的底层就是对servlet的底层封装

5 前端发送的请求将会去springmvc查找

6 方便配置文件的管理