<!-- 数据库驱动-->

    <dependency>

        <groupId>mysql</groupId>

        <artifactId>mysql-connector-java</artifactId>

        <version>8.0.19</version>

    </dependency>

    <!-- mybatis的依赖-->

    <dependency>

        <groupId>org.mybatis</groupId>

        <artifactId>mybatis</artifactId>

        <version>3.5.4</version>

    </dependency>

    <!-- mybatis-generator的依赖 -->

    <dependency>

        <groupId>org.mybatis.generator</groupId>

        <artifactId>mybatis-generator-core</artifactId>

        <version>1.3.6</version>

    </dependency>

<?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>

    <!--  数据库驱动的jar包 -->

    <!--<classPathEntry location="F:/maven/repository/mysql/mysql-connector-java/8.0.19/mysql-connector-java-8.0.19.jar" />-->

    <!-- context配置环境 -->

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

        <!-- xml文件不追加。配置同名文件覆盖时，默认只覆盖mapper接口、实体类，xml映射文件会以追加方式写入 -->

        <!-- 使用此插件后，不管生成多少次，同名xml映射文件都是直接覆盖 -->

        <plugin type="org.mybatis.generator.plugins.UnmergeableXmlMappersPlugin"></plugin>

        <!--配置生成的注释-->

        <commentGenerator>

            <!-- 去掉方法注释，默认会生成大量的方法说明注释，很不友好  -->

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

            <!-- 去掉注释中的时间戳 -->

            <property name="suppressDate" value="true"/>

        </commentGenerator>

        <!-- 数据库连接信息 -->

        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"

                        connectionURL="jdbc:mysql://localhost:3306/db_user?serverTimezone=UTC"

                        userId="chy"

                        password="abcd">

        </jdbcConnection>

        <!-- 配置表字段、java之间的类型转换-->

        <javaTypeResolver >

            <!-- 是否将Numeric、Decimal全部转换为BigDecimal类型，设置为false，会根据表字段的长度转换响应的类型，Short  <5，Integer 5~9，Long 10~18，BigDecimal  >18  -->

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

        </javaTypeResolver>

        <!-- 配置pojo类的生成规则，主要配置实体类存放的包、该包的位置 -->

        <!-- mapper、实体类这些包、文件夹不需要我们手动创建，会自动创建 -->

        <javaModelGenerator targetPackage="com.chy.mall.model" targetProject="src/main/java">

            <property name="enableSubPackages" value="true" />

            <!-- 是否去掉String两端的空格，这个可要可不要，缺省时默认为false -->

            <!--<property name="trimStrings" value="true" />-->

        </javaModelGenerator>

        <!-- 配置xml映射文件的生成规则 -->

        <sqlMapGenerator targetPackage="mapper"  targetProject="src/main/resources">

            <property name="enableSubPackages" value="true" />

        </sqlMapGenerator>

        <!-- 配置mapper接口的生成规则 -->

        <javaClientGenerator type="XMLMAPPER" targetPackage="com.chy.mall.dao"  targetProject="src/main/java">

            <property name="enableSubPackages" value="true" />

        </javaClientGenerator>

        <!-- 配置要使用的数据表，需要配置mapper接口、映射文件名以及实体类名，不然tb_user生成的是TbUserMapper、TbUser -->

        <!-- 默认会生成大量的example相关的东西，不需要，禁用所有的example选项 -->

        <!-- 字段会自动完成映射，比如user_id会自动映射为userId -->

        <!-- 写好一个，Ctrl+D复制到下一行 -->

        <table tableName="tb_user" mapperName="UserMapper" domainObjectName="User" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false" />

        <table tableName="tb_permission" mapperName="PermissionMapper" domainObjectName="Permission" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false" />

    </context>

</generatorConfiguration>

package test;

import org.mybatis.generator.api.MyBatisGenerator;

import org.mybatis.generator.config.Configuration;

import org.mybatis.generator.config.xml.ConfigurationParser;

import org.mybatis.generator.exception.InvalidConfigurationException;

import org.mybatis.generator.exception.XMLParserException;

import org.mybatis.generator.internal.DefaultShellCallback;

import java.io.IOException;

import java.io.InputStream;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

public class Test {

    public static void main(String[] args) throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {

        List<String> warnings = new ArrayList<String>();

        //生成文件时如果已存在同名文件，会覆盖

        boolean overwrite = true;

        //指定mybatis-generator配置文件的位置

        InputStream configFile = Test.class.getResourceAsStream("/generatorConfig.xml");

        ConfigurationParser cp = new ConfigurationParser(warnings);

        Configuration config = cp.parseConfiguration(configFile);

        DefaultShellCallback callback = new DefaultShellCallback(overwrite);

        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);

        myBatisGenerator.generate(null);

    }

}

    <build>

        <plugins>

            <plugin>

                <groupId>org.mybatis.generator</groupId>

                <artifactId>mybatis-generator-maven-plugin</artifactId>

                <version>1.4.0</version>

                <configuration>

                    <!-- 覆盖同名文件 -->

                    <overwrite>true</overwrite>

                </configuration>

            </plugin>

        </plugins>

    </build>

 <!--  数据库驱动的jar包 -->

 <classPathEntry location="F:/maven/repository/mysql/mysql-connector-java/8.0.19/mysql-connector-java-8.0.19.jar" />