1.简单生成

  1.添加依赖和插件

<dependencies>

  <!-- MyBatis核心依赖包 -->
  <dependency>
     <groupId>org.mybatis</groupId>
     <artifactId>mybatis</artifactId>
     <version>3.5.9</version>
  </dependency>

  <!-- MySQL驱动 -->
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.49</version>
   </dependency>

  <!-- log4j日志 -->
  <dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
  </dependency>
</dependencies>

<!-- 控制Maven在构建过程中相关配置 -->
<build>

  <!-- 构建过程中用到的插件 -->
  <plugins>

    <!-- 具体插件，逆向工程的操作是以构建过程中插件形式出现的 -->
    <plugin>
       <groupId>org.mybatis.generator</groupId>
       <artifactId>mybatis-generator-maven-plugin</artifactId>
       <version>1.3.0</version>

       <!-- 插件的依赖 -->
       <dependencies>

         <!-- 逆向工程的核心依赖 -->
         <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
         </dependency>

         <!-- 数据库连接池 -->
         <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.2</version>
         </dependency>

         <!-- MySQL驱动 -->
         <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
         </dependency>
       </dependencies>
     </plugin>
  </plugins>
</build>

  2.创建MyBatis的核心配置文件

    mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <properties resource="jdbc.properties"/>
    <typeAliases>
        <package name=""/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <package name=""/>
    </mappers>
</configuration>

  3.创建逆向工程的配置文件

    generatorConfig.xml

<?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>
    <!--
    targetRuntime: 执行生成的逆向工程的版本
    MyBatis3Simple: 生成基本的CRUD（清新简洁版）
    MyBatis3: 生成带条件的CRUD（奢华尊享版）
    -->
    <context id="DB2Tables" targetRuntime="MyBatis3Simple">

        <!-- 数据库的连接信息 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://192.168.2.18:3306/test"
                        userId="root"
                        password="root">
        </jdbcConnection>

        <!-- javaBean的生成策略-->
        <javaModelGenerator targetPackage="org.example.mybatis.pojo" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!-- SQL映射文件的生成策略 -->
        <sqlMapGenerator targetPackage="org.example.mybatis.mapper"
                         targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- Mapper接口的生成策略 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="org.example.mybatis.mapper"
                             targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- 逆向分析的表 -->
        <!-- tableName设置为*号，可以对应所有表，此时不写domainObjectName -->
        <!-- domainObjectName属性指定生成出来的实体类的类名 -->
        <table tableName="t_emp" domainObjectName="Emp"/>
        <table tableName="t_dept" domainObjectName="Dept"/>
    </context>
</generatorConfiguration>

  mybatis.orgdtdmybatis-generator-config_1_0.dtd标红

解决方案：左边有红色小灯泡，点击Fetch external resource即可解决

  4.最后的目录结构

  5.执行MBG插件的generate目标

  6.生成的目录