1、搭建工程，引入jar包依賴

<!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
        </dependency>
 

2、配置檔案generatorConfig.xml放在src/main/resources目錄下，檔名不要改

<?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">
<!-- 在專案根目錄下(pom.xml同級)開啟命令列工具：mvn mybatis-generator:generate -->
<generatorConfiguration>
    <!-- 引入配置檔案 -->
    <properties resource="application.properties"/>

    <!-- 指定資料連線驅動jar地址 -->
    <!-- 配置成你本地的mysql-connector-java jar -->
    <classPathEntry
            location="D:\maven\test\mysql\mysql-connector-java\5.1.44\mysql-connector-java-5.1.44.jar" />


    <context id="baseTradeTables" targetRuntime="MyBatis3">
        <!-- 註釋 -->
        <commentGenerator type="mybatis.MyCommentGenerator">
            <property name="suppressAllComments" value="false"/><!-- 是否取消註釋 -->
            <property name="suppressDate" value="false" /> <!-- 是否生成註釋代時間戳-->
        </commentGenerator>

        <!-- 資料庫地址、使用者名稱、密碼 -->
        <jdbcConnection driverClass="${jdbc.driver}"
                        connectionURL="${jdbc.url}" userId="${jdbc.username}"
                        password="${jdbc.password}">
        </jdbcConnection>

        <!-- 型別轉換 -->
        <javaTypeResolver>
            <!-- 是否使用bigDecimal， false可自動轉化以下型別（Long, Integer, Short, etc.） -->
            <property name="forceBigDecimals" value="true"/>
        </javaTypeResolver>

        <!-- 後臺生成 -->
        <!-- model -->
        <javaModelGenerator targetPackage="com.cmcc.open.base.po"
                            targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
            <!-- 是否針對string型別的欄位在set的時候進行trim呼叫 -->
            <property name="trimStrings" value="false"/>
        </javaModelGenerator>

        <!-- Mapper對映 -->
        <sqlMapGenerator targetPackage="mybatis"
                         targetProject="src/main/resources">
            <!-- 是否在當前路徑下新加一層schema,eg：fase路徑com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] -->
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- Mapper介面 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.cmcc.open.base.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- 表 -->
        <table tableName="mas_template" domainObjectName="MasTemplate" enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false">
            <generatedKey column="id" sqlStatement="MySql" identity="true"/>
        </table>
    </context>
</generatorConfiguration>
 

3、資料庫配置檔案application.properties 

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://12331
jdbc.username=121
jdbc.password=121

4、定製類MyCommentGenerator實現介面CommentGenerator（可以將資料庫欄位註釋對應寫到實體類的屬性上面）

5、main方法

public static void main(String[] args) {
        try {
            List<String> warnings = new ArrayList<String>();
            boolean overwrite = true;
            ClassLoader classloader = Thread.currentThread().getContextClassLoader();
            InputStream is = classloader.getResourceAsStream("generatorConfig.xml");
            ConfigurationParser cp = new ConfigurationParser(warnings);
            Configuration config = cp.parseConfiguration(is);
            DefaultShellCallback callback = new DefaultShellCallback(overwrite);
            MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
            myBatisGenerator.generate(null);
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (InvalidConfigurationException e) {
            e.printStackTrace();
        } catch (XMLParserException e) {
            e.printStackTrace();
        }