<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-generator</artifactId>
    <version>3.4.1</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>
<dependency>
    <groupId>org.apache.velocity</groupId>
    <artifactId>velocity-engine-core</artifactId>
    <version>2.0</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-boot-starter</artifactId>
    <version>3.0.0</version>
</dependency>
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
</dependency>

package com.changlu.demo;

import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.converts.MySqlTypeConvert;
import com.baomidou.mybatisplus.generator.config.rules.DbColumnType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;

/**
 * @author ChangLu
 * @date 2021/09/22 16:38
 * @Desc 封裝之后的代碼生成器，僅需填寫幾個(gè)核心配置即可
 * 
 *  核心依賴
    *  <dependency>       
    *      <groupId>com.baomidou</groupId>       
    *      <artifactId>mybatis-plus-generator</artifactId>       
    *      <version>3.4.1</version>       
    *  </dependency>       
    *  <dependency>       
    *      <groupId>mysql</groupId>       
    *      <artifactId>mysql-connector-java</artifactId>       
    *      <scope>runtime</scope>       
    *  </dependency>       
    *  <dependency>       
    *      <groupId>org.apache.velocity</groupId>       
    *      <artifactId>velocity-engine-core</artifactId>       
    *      <version>2.0</version>       
    *  </dependency>       
 *  其他依賴如：lombok、swagger3
 **/
public class MyCodeGenerator {

    //核心配置
    private static String targetDatabaseName = "dj.svublog.rdb";//目標(biāo)數(shù)據(jù)庫(kù)名
    private static String username = "root";//用戶名
    private static String password = "123456";//密碼
    private static String[] tihuan_table_prefix = {"sys_"}; //表替換前綴，可多個(gè)
    private static String[] paichu_table_name = {"sys_member_role","sys_role_permission"}; //排除指定表，可多個(gè)
    private static String referenceModule = "com.changlu.demo"; //當(dāng)前的引用模塊，如com.changlu.demo
    private static String targetModule = "test"; //輸出指定文件目錄的包名 如：test

    public static void main(String[] args) {
        // 代碼生成器
        AutoGenerator mpg = new AutoGenerator();

        //全局配置（若是多模塊的話傳入對(duì)應(yīng)模塊的工程名！）
        mpg.setGlobalConfig(createGlobalConfig(null));
//        mpg.setGlobalConfig(createGlobalConfig(common));
        //數(shù)據(jù)庫(kù)源
        mpg.setDataSource(createDataSourceConfig());
        //包配置
        mpg.setPackageInfo(createPackageConfig());
        //策略配置
        mpg.setStrategy(createStrategyConfig());
        //默認(rèn)Velocity模板生成
//        mpg.setTemplateEngine(new FreemarkerTemplateEngine());  //其他模板Freemarker

        //執(zhí)行操作
        mpg.execute();
    }
    // 1、全局配置  若是多模塊，傳入指定父模塊名稱
    private static GlobalConfig createGlobalConfig(String parentModuleName){
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");//獲取到當(dāng)前工程路徑地址，若是多模塊情況就會(huì)有問(wèn)題
        if(parentModuleName != null){
            projectPath = projectPath + "/"+parentModuleName+ "/src/main/java";
        }else{
            projectPath = projectPath + "/src/main/java";
        }
        gc.setOutputDir(projectPath)
                .setAuthor("ChangLu") //設(shè)置作者
                .setOpen(false) //不打開輸出目錄
                .setSwagger2(true) //添加swagger2注解
                .setBaseResultMap(true) //每個(gè)mapper文件中都生成通用結(jié)果映射集
                .setFileOverride(true) //下次生成文件時(shí)進(jìn)行覆蓋(不設(shè)置的話當(dāng)進(jìn)行第二次生成就會(huì)在同一個(gè)目錄產(chǎn)生相同的文件)
                .setEntityName("%sModel") //生成實(shí)體類文件名，如：%sModel 生成 UserModel
                .setMapperName("%sMapper") //生成dao，這里我們配置生成如 UserMapper
                .setMapperName("%sMapper") //生成mapper.xml文件，這里生成如 UserMapper.xml
                .setServiceName("%sService") //生成service接口
                .setServiceImplName("%sServiceImpl");//生成service實(shí)現(xiàn)類
        return gc;
    }

    // 2、數(shù)據(jù)庫(kù)源
    private static DataSourceConfig createDataSourceConfig(){
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://127.0.0.1:3306/+"+targetDatabaseName+"+?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai")
            .setDriverName("com.mysql.cj.jdbc.Driver")
            .setUsername(username)
            .setPassword(password);
        //轉(zhuǎn)換類型  LocalDateTime=>Date
        dsc.setTypeConvert((globalConfig, fieldType) -> {
            String t = fieldType.toLowerCase();
            if(t.contains("datetime")){   //若是匹配到數(shù)據(jù)庫(kù)類型為"datetime"，就返回Date類型（轉(zhuǎn)為Java的）
                return DbColumnType.DATE;
            }
            //其它字段采用默認(rèn)轉(zhuǎn)換（非mysql數(shù)據(jù)庫(kù)可以使用其它默認(rèn)的數(shù)據(jù)庫(kù)轉(zhuǎn)換器）
            return new MySqlTypeConvert().processTypeConvert(globalConfig,fieldType);
        });
        return dsc;
    }

    //3、包配置
    private static PackageConfig createPackageConfig(){
        PackageConfig pc = new PackageConfig();
        pc.setModuleName(targetModule) //生成的模塊名，也就是生成目標(biāo)指定文件名的路徑下
          .setParent(referenceModule); //父包名。如果為空，將下面子包名必須寫全部， 否則就只需寫子包名
        return pc;
    }

    //4、策略配置
    private static StrategyConfig createStrategyConfig(){
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel) //表名生成策略：下劃線轉(zhuǎn)駝峰，如pms_pro=>PmsPro
                .setColumnNaming(NamingStrategy.underline_to_camel) //字段名生成策略，同上，如last_name=>lastName
                .setEntityLombokModel(true) //支持lombok注解
                .setTablePrefix(tihuan_table_prefix) //設(shè)置表的替換前綴：這里就是起到過(guò)濾作用
                .setEntityTableFieldAnnotationEnable(true) //生成表、字段映射注解
                .setExclude(paichu_table_name); //排除指定表
        return strategy;
    }
}