第一个SpringMVC程序

2021-06-23 09:05

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准备工作：

1、第一步先创建一个maven的工程，选择webapp项目

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2、取一个artificts名字spring-mvc一路下一步，反正是要配的，具体artifacts怎么用的我还没弄明白，后面再出个随笔

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3、设置目录，点击完成创建

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4、将默认的依赖删掉，自己添加springMVC的jar依赖

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5、添加相关依赖

dependencies>
        
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-coreartifactId>
            version>5.0.5.RELEASEversion>
        dependency>
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-beansartifactId>
            version>5.0.5.RELEASEversion>
        dependency>
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-contextartifactId>
            version>5.0.5.RELEASEversion>
        dependency>
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-expressionartifactId>
            version>5.0.5.RELEASEversion>
        dependency>

        
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-aopartifactId>
            version>5.0.5.RELEASEversion>
        dependency>
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-aspectsartifactId>
            version>5.0.5.RELEASEversion>
        dependency>

        
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-webartifactId>
            version>5.0.5.RELEASEversion>
        dependency>
        
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-jdbcartifactId>
            version>5.0.5.RELEASEversion>
        dependency>
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-txartifactId>
            version>5.0.5.RELEASEversion>
        dependency>

        
        dependency>
            groupId>org.mybatisgroupId>
            artifactId>mybatisartifactId>
            version>3.3.0version>
        dependency>
        dependency>
            groupId>org.mybatisgroupId>
            artifactId>mybatis-springartifactId>
            version>1.3.1version>
        dependency>

        
        dependency>
            groupId>org.springframeworkgroupId>
            artifactId>spring-webmvcartifactId>
            version>5.0.5.RELEASEversion>
        dependency>
       
       dependency>
            groupId>javax.servletgroupId>
            artifactId>javax.servlet-apiartifactId>
            version>3.1.0version>
      dependency>
       dependency>
           groupId>javax.servlet.jspgroupId>
           artifactId>jsp-apiartifactId>
           version>2.2version>
       dependency>
      dependency>
          groupId>jstlgroupId>
          artifactId>jstlartifactId>
          version>1.2version>
      dependency>  
dependencies>

这里需要注意有个小技巧，有的时候添加依赖的时候maven显示找不到，带红色波浪线，可以先去百度搜有没有这个版本号，修改版本号重新导入一下

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比如查到mybatis-spring的版本号有1.3.1，再在version一栏添加1.3.1

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springMVC执行过程：

一、配置核心控制器

在web.xml里面配置

xml version="1.0" encoding="UTF-8"?>
web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

    
    servlet>
        servlet-name>springMVCservlet-name>
        servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
        
        load-on-startup>1load-on-startup>
    servlet>
    servlet-mapping>
        servlet-name>springMVCservlet-name>
        url-pattern>/url-pattern>
    servlet-mapping>
web-app>

二、创建并配置核心配置文件

两种定义方式：

使用默认位置，在WEB-INF下面创建springMVC-servlet.xml
自定义位置，名称自定义

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/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    
    bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
    
    bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
    
    bean name="/hello" class="controller.HelloController"/>
    
    bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        property name="prefix" value="/WEB-INF/view/"/>
        property name="suffix" value=".jsp"/>
        
        property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    bean>

三、用实现接口的方式编写一个controller类

package controller;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @Description:处理请求，返回mav
 * @Authoor: hujian
 * @Date: 2018/9/19 13:02
 * @Version 1.0.0
 */
public class HelloController implements Controller {
    @Override
    public ModelAndView handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {
        String name = req.getParameter("name");
        ModelAndView mav = new ModelAndView();
        mav.addObject("msg","Hello"+name);
        mav.setViewName("hello");
        return mav;
    }
}

四、再新建一个hello.jsp

  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2018/9/19
  Time: 13:06
  To change this template use File | Settings | File Templates.
--%>Title
   msg:${msg}