前言

因为我不太会讲原理这些，所以只有一些步骤，配置文件放在哪里都是本人的习惯，如果想改的话需要修改一些其他的配置，如果不太懂就可以照着我的步骤来，或者评论区问也是可以的，谢谢大家！

1.创建Maven项目

创建Maven项目在我的另一篇博客Maven项目创建

2.导入依赖包

项目创建完后弹出一个选项，点击Enable Auto-Import后，添加依赖包后会自动导入
（在pom.xml中粘贴需要用到的依赖包） 项目加载完之后pom.xml会有很多没用的代码，清除后结构大概为：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <packaging>war</packaging>

    <name>ssm-demo</name>
    <groupId>com.demo</groupId>
    <artifactId>ssm-demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.8</version>
        </dependency>
        <!-- spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>

        <!--数据源-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.2</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>

</project>

3.配置web.xml

在src\main\webapp\WEB-INF目录中找到web.xml，将内容替换为

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
         xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>


  <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:springmvc.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

4.配置springmvc.xml

在src\main\resouces目录新建文件springmvc.xml文件，内容如下

<?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:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.2.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

    <context:component-scan base-package="com.demo" />

    <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="url" value="jdbc:mysql://localhost:3306/testuseUnicode=true&amp;characterEncoding=utf-8" />
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="username" value="root" />
        <property name="password" value="111111" />
    </bean>

    <bean name="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="mapperLocations" value="classpath:xml/*.xml" />
    </bean>

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sessionFactory" />
        <property name="basePackage" value="com.demo.dao" />
    </bean>

    <mvc:annotation-driven />
    <mvc:default-servlet-handler />
</beans>

5.数据库连接

首先开启MySQL服务，然后在IDEA上操作MySQL数据库
点击Mysql

6.生成实体类

在main目录新建java文件夹，然后停留Mark Directory as，点击这个蓝色的，之后新建包com.demo.entity

在界面右侧，右击表，即可生成实体类，选中这个，然后放到src\main\java\com\demo\entity

生成实体类后需要把类的第一句修改成相应的包

7.dao层

在java目录新建com.demo.dao包，在包内新建StudentDao接口，内容如下：

package com.demo.dao;

import com.demo.entity.Student;

import java.util.List;

public interface StudentDao {
    /**
     * 查询Student表全部数据
     * @return
     */
    public List<Student> selectStudent();
}

8.service业务层

在java目录新建com.demo.service包，在包内新建StudentService接口，内容如下：

package com.demo.service;

import com.demo.entity.Student;

import java.util.List;

public interface StudentService {
    /**
     * 查询Student表全部数据
     * @return
     */
    public List<Student> selectStudent();
}

在com.demo.service包中新建impl包，在包内新建StudentServiceImpl实现类，内容如下：

package com.demo.service.impl;

import com.demo.dao.StudentDao;
import com.demo.entity.Student;
import com.demo.service.StudentService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

/**
 * 实现类
 */
@Service
public class StudentServiceImpl implements StudentService {
    //需要调用dao层的方法
    @Resource
    private StudentDao dao;

    public List<Student> selectStudent() {
        return dao.selectStudent();
    }
}

9.Controller控制层

在com.demo包中新建controller包，在包中新建控制类StudentController，内容如下：

package com.demo.controller;

import com.demo.entity.Student;
import com.demo.service.StudentService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.annotation.Resource;
import java.util.List;

/**
 * 说明这是个控制器类
 */
@Controller
public class StudentController {
    /**
     * 数据源
     */
    @Resource
    private StudentService studentService;

    /**
     * service拿到数据放到model并且传到index.jsp页面
     * @param model
     * @return
     */
    @RequestMapping("index")
    public String index(Model model){
        List<Student> students = studentService.selectStudent();
        model.addAttribute("list",students);
        return "index.jsp";
    }
}

10.编写映射文件

在resouces目录新建xml目录，然后在xml目录新建Student.xml文件，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.demo.dao.StudentDao">
    <select id="selectStudent" resultType="com.demo.entity.Student">
        select * from student
    </select>
</mapper>

11.jsp页面

在webapp目录新建index.jsp页面，内容如下：
<%@ page contentType=“text/html;charset=UTF-8” language=“java” %>
<%@ taglib uri=“http://java.sun.com/jstl/core_rt” prefix=“c” %>

<html>
<head>
    <title>学生信息列表</title>
</head>
<body>
<table border="1">
    <tr>
        <td>姓名</td>
        <td>年龄</td>
        <td>性别</td>
        <td>手机号码</td>
        <td>邮箱</td>
        <td>班级ID</td>
    </tr>
    <c:forEach var="list" items="${list}">
        <tr>
            <td>${list.name}</td>
            <td>${list.age}</td>
            <td>${list.gender}</td>
            <td>${list.telephone}</td>
            <td>${list.email}</td>
            <td>${list.classId}</td>
        </tr>
    </c:forEach>
</table>
</body>
</html>

12.配置tomcat

配置Tomcat可以参考 使用IntelliJ IDEA配置Tomcat（入门）

13.运行项目

配置好Tomcat后，点击运行

运行后在浏览器地址栏追加index

运行结果：

14.总结

如果按照步骤写完项目后遇到BUG，评论区可以问我。