1、pom.xml中新增plugin

    <plugin>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-maven-plugin</artifactId>
        <version>1.3.7</version>

        <configuration>
               <overwrite>true</overwrite>
        </configuration>
    </plugin>

2、新建resources/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>
    <!--    windows下路径, D:\downloads\xxx.jar-->
    <classPathEntry location="C:\Users\Administrator\Desktop\mysql-connector-java-5.1.6.jar" />

    <context id="DB2Tables" targetRuntime="MyBatis3">

        <!--        不再追加xml内容-->
        <plugin type="org.mybatis.generator.plugins.UnmergeableXmlMappersPlugin" />

        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/mall?characterEncoding=utf-8"
                        userId="root"
                        password="">
        </jdbcConnection>

        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <javaModelGenerator targetPackage="com.imooc.mall.pojo" targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
            <!--            <property name="trimStrings" value="true" />-->
        </javaModelGenerator>

        <sqlMapGenerator targetPackage="mappers"  targetProject="src/main/resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <javaClientGenerator type="XMLMAPPER" targetPackage="com.imooc.mall.dao"  targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--        <table tableName="mall_order" domainObjectName="Order" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false"/>-->
        <!--        <table tableName="mall_order_item" domainObjectName="OrderItem" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false"/>-->
        <!--        <table tableName="mall_user" domainObjectName="User" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false"/>-->
        <!--        <table tableName="mall_category" domainObjectName="Category" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false"/>-->
        <!--        <table tableName="mall_product" domainObjectName="Product" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false">-->
        <!--            <columnOverride column="detail" jdbcType="VARCHAR" />-->
        <!--            <columnOverride column="sub_images" jdbcType="VARCHAR" />-->
        <!--        </table>-->
        <table tableName="mall_shipping" domainObjectName="Shipping" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false"/>

    </context>
</generatorConfiguration>

注意：

        context 中内容是有顺序的

        commentGenerator在前面s

3、idea中的terminal中执行mybatis自动生成命令 

mvn mybatis-generator:generate