<!DOCTYPE generatorConfiguration 
      PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
      "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!-- 数据库驱动-->
    <classPathEntry  location="C:\Users\lijia\.m2\repository\com\microsoft\sqlserver\sqljdbc4\4.0\sqljdbc4-4.0.jar"/>

    <context id="VenueGenerator"  targetRuntime="MyBatis3">
        <commentGenerator>
            <!--关闭时间注释 -->
            <property name="suppressDate" value="true"/>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据库链接URL，用户名、密码 -->
        <jdbcConnection driverClass="com.microsoft.sqlserver.jdbc.SQLServerDriver" 
       connectionURL="jdbc:sqlserver://localhost:1433;databaseName=ssm" userId="sa" password="123456">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成model的包名和位置-->
        <javaModelGenerator targetPackage="org.first.entity" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成映射XML文件的包名和位置-->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成Mapper文件包名和位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="org.first.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 要生成哪些表-->
        <table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" 
       enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
            <property name="useActualColumnNames" value="true" />
            <generatedKey column="username" sqlStatement="SqlServer" type="post" identity="true"/>
        </table>
    </context>
</generatorConfiguration>

在pom.xml加插件

  <plugins>  
    <plugin>  
      <groupId>org.mybatis.generator</groupId>  
      <artifactId>mybatis-generator-maven-plugin</artifactId>  
      <version>1.3.2</version>  
      <configuration>  
        <verbose>true</verbose>  
        <overwrite>true</overwrite>  
      </configuration>  
    </plugin>  
  </plugins> 

右键maven build goals: mybatis-generator:generate -e