$1、首先下载maven

1）、然后将apache-maven-3.5.3-bin.zip解压到当前文件夹，最好放置在D或者E盘根目录

2）、在上一个文件所在的根目录下新建一个文件夹，名字叫做MavenRepository，这个文件夹是maven下载jar包自动存放的文件夹

3）、修改D:\apache-maven-3.5.3\conf目录下的settings.xml文件，将localRepository中的内容修改为MavenRepository的路径，例如：D:/MavenRepositor，作用是指定maven下载jar包的存放路径

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4）、任然是修改D:\apache-maven-3.5.3\conf目录下的settings.xml文件，修改为下图的样式，因为我们如果直接在原来的路径上，是国外的网站，下载jar包速度会比较慢，所以我们使用aliyun网站，从这里下载

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5）、配置环境变量

配置环境变量分为2步
第一步：配置一个叫做M2_HOME的环境变量

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第二步：修改path，在path的最前面加上%M2_HOME%\bin;

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配置完成以后，打开cmd测试一下是否配置完成，输入： mvn -version测试环境变量是否配置好

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5）、在IntelliJ IDEA中配置maven

打开-File-Settings

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6）、新建maven项目

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参考图片中给所选项，点击下一步

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点击下一步

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点击下一步
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完成

7）、在main下面新建一个resouces目录，转成资源目录

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8）、修改pom.xml

<?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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>neusoft</groupId>
  <artifactId>neusoft</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>neusoft Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <!-- spring版本号 -->
    <spring.version>4.0.2.RELEASE</spring.version>
    <!-- mybatis版本号 -->
    <mybatis.version>3.2.6</mybatis.version>
    <!-- log4j日志文件管理包版本 -->
    <slf4j.version>1.7.7</slf4j.version>
    <log4j.version>1.2.17</log4j.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <!-- 导入java ee jar包（可以去除index.jsp报错） -->
    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-api</artifactId>
      <version>7.0</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <!-- 表示开发的时候引入，发布的时候不会加载此包 -->
      <scope>test</scope>
    </dependency>
    <!-- spring核心包 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-oxm</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!-- mybatis核心包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!-- mybatis/spring包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.2</version>
    </dependency>
    <!-- 导入Mysql数据库链接jar包 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.30</version>
    </dependency>
    <!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.2.2</version>
    </dependency>
    <!-- JSTL标签类 -->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- 日志文件管理包 -->
    <!-- log start -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>${log4j.version}</version>
    </dependency>
    <!-- 格式化对象，方便输出日志 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.1.41</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <!-- log end -->
    <!-- 映入JSON -->
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-mapper-asl</artifactId>
      <version>1.9.13</version>
    </dependency>
    <!-- 上传组件包 -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.9</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.9</version>
    </dependency>
  </dependencies>

  <build>
    <finalName>ssm_maven_demo</finalName>
    <resources>
      <resource>
        <directory>src/main/java</directory>
        <!-- 此配置不可缺，否则mybatis的Mapper.xml将会丢失 -->
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
      <!--指定资源的位置-->
      <resource>
        <directory>src/main/resources</directory>
      </resource>
    </resources>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.0.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.7.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.20.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
          <plugin>
              <!--Mybatis-generator插件,用于自动生成Mapper和POJO-->
              <groupId>org.mybatis.generator</groupId>
              <artifactId>mybatis-generator-maven-plugin</artifactId>
              <version>1.3.2</version>
              <configuration>
                  <!--配置文件的位置-->
                  <configurationFile>src/main/resources/mybatis/generatorConfig.xml</configurationFile>
                  <verbose>true</verbose>
                  <overwrite>true</overwrite>
              </configuration>
              <executions>
                  <execution>
                      <id>Generate MyBatis Artifacts</id>
                      <goals>
                          <goal>generate</goal>
                      </goals>
                  </execution>
              </executions>
              <dependencies>
                  <dependency>
                      <groupId>org.mybatis.generator</groupId>
                      <artifactId>mybatis-generator-core</artifactId>
                      <version>1.3.2</version>
                  </dependency>
              </dependencies>
          </plugin>
      </plugins>
    </pluginManagement>
  </build>


</project>

选择右下角的import changes

9）、将webapp下面的内容全部删除，然后将建立以下的目录结构，配置对应的web.xml

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10）、resorces对应ssm框架的config目录，目录结构如下：

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11）、在main下创建一个java目录，然后转换成，再在java下创建一个com.neusoft包，然后将我之前写在ssm框架里面的src里面的包，同样从com.neusoft包里面复制过来，结构如下

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12）、配置tomcat服务器

13）、配置mybatis自动生成器

首先创建一个generatorConfig.xml，写在mybatis下面,注意configurationFile属性里面的值是否对应generatorConfig.xmll的真实路径

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
  <!-- 引入配置文件 -->
    <!--TODO 注意！！！自动生成代码 要把这句放开,链接数据库-->
<!-- 指定数据连接驱动jar地址 -->
    <classPathEntry  location="D:\MavenRepository\mysql\mysql-connector-java\5.1.30\mysql-connector-java-5.1.30.jar"/>
    <context id="DB2Tables"  targetRuntime="MyBatis3">
        <commentGenerator>
<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressDate" value="true"/>
            
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!-- 数据库的相关配置 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/mybatis" userId="root" password="root">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 实体类生成的位置 -->
        <javaModelGenerator targetPackage="com.neusoft.domain" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
       <!-- *Mapper.xml 文件的位置 ，targetPackage：包名，targetProject：项目下的路径-->
        <sqlMapGenerator targetPackage="com.neusoft.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
       <!-- Mapper 接口文件的位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.neusoft.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 配置表信息 -->
        <!--第三方服务类型-->
        <table tableName="emp" domainObjectName="Emp" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
        <table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
        <table tableName="salgrade" domainObjectName="Salgrade" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<!--xxtable-->
        <!--如果生成n个表，那就将上面的那段table代码copy n份-->
    </context>
</generatorConfiguration>

IntelliJ IDEA中使用mybatis-generator，代码自动生成器：
https://www.jianshu.com/p/d019c9880d25