只需两步，教你使用Mybatis-Plus代码生成器

一、添加maven依赖

<dependency>
    <groupId>com.baomidougroupId>
    <artifactId>mybatis-plus-boot-starterartifactId>
    <version>3.1.2version>
dependency>

<dependency>
    <groupId>mysqlgroupId>
    <artifactId>mysql-connector-javaartifactId>
    <version>8.0.16version>
dependency>

<dependency>
    <groupId>com.baomidougroupId>
    <artifactId>mybatis-plus-generatorartifactId>
    <version>3.1.2version>
dependency>

<dependency>
    <groupId>org.apache.velocitygroupId>
    <artifactId>velocity-engine-coreartifactId>
    <version>2.1version>
dependency>

二、调用生成代码的类

调用以下的代码生成代码，你只需要修改对应的main类中的你的对应数据库信息。

package com.credithc.framework.generator;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.FileOutConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.TemplateConfig;
import com.baomidou.mybatisplus.generator.config.po.TableFill;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.VelocityTemplateEngine;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class MybatisPlusGenerator {
    public static String scanner(String tip) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder help = new StringBuilder();
        help.append(tip + "：");
        System.out.println(help.toString());
        if (scanner.hasNext()) {
            String ipt = scanner.next();
            if (StringUtils.isNotEmpty(ipt)) {
                return ipt;
            }
        }
        throw new MybatisPlusException("请输入正确的" + tip + "！");
    }

    /**
     *
     * @param author 生成代码的作者
     * @param dbIP 数据库Ip
     * @param dbPort 数据库的端口号
     * @param dbName 数据库的名字
     * @param dbUser 数据库的账号
     * @param dbPwd 数据库的密码
     * @param projectPath 代码的绝对根目录
     * @param basePackageName 代码的包名目录
     * @param moduleName 表隶属的模块名
     * @param tableNames 表的名字，可以多表
     */
    public static void generate(String author, String dbIP, String dbPort, String dbName, String dbUser, String dbPwd, String projectPath, String basePackageName, String moduleName, String... tableNames) {
        // 自定义需要填充的字段
        List<TableFill> tableFillList = new ArrayList<TableFill>();
        // 每张表都有一个创建时间、修改时间
        TableFill createField = new TableFill("create_time", FieldFill.INSERT);
        TableFill modifiedField = new TableFill("update_time", FieldFill.INSERT_UPDATE);
        tableFillList.add(createField);
        tableFillList.add(modifiedField);

        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 选择引擎需要指定如下加，注意 pom 依赖必须有！
        mpg.setTemplateEngine(new VelocityTemplateEngine());

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        gc.setOutputDir(projectPath + "/src/main/java");
        gc.setAuthor(author);
        gc.setOpen(false);
        gc.setActiveRecord(true);
        gc.setSwagger2(true);
/*
        gc.setMapperName("%sDao");// 设置Mapper接口的名字
*/
        gc.setFileOverride(true);// 重新生成的时候，会覆盖之前的
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://" + dbIP + ":" + dbPort + "/" + dbName + "?useUnicode=true&useSSL=false&characterEncoding=utf8");
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername(dbUser);
        dsc.setPassword(dbPwd);
        mpg.setDataSource(dsc);

        // 模块配置
        PackageConfig pc = new PackageConfig();
        pc.setModuleName(moduleName);
        pc.setParent(basePackageName);
        mpg.setPackageInfo(pc);

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
            }
        };
        List<FileOutConfig> focList = new ArrayList<>();
        focList.add(new FileOutConfig("/templates/mapper.xml.vm") {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定义输入文件名称
                return projectPath + "/src/main/resources/mapper/" + pc.getModuleName()
                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);
        mpg.setTemplate(new TemplateConfig().setXml(null));

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
/*
        strategy.setSuperEntityClass("com.baomidou.mybatisplus.samples.generator.common.BaseEntity");
*/
        strategy.setEntityLombokModel(true);
        strategy.setEntityBuilderModel(true);
        strategy.setTableFillList(tableFillList);
/*
        strategy.setSuperControllerClass("com.baomidou.mybatisplus.samples.generator.common.BaseController");
*/
        strategy.setInclude(tableNames);
        strategy.setEntityTableFieldAnnotationEnable(true);
/*
        strategy.setSuperEntityColumns("id");
*/
        strategy.setControllerMappingHyphenStyle(true);
        strategy.setTablePrefix(pc.getModuleName() + "_");
        mpg.setStrategy(strategy);
/*
        mpg.getPackageInfo().setMapper("dao");
*/
        mpg.execute();
    }

    public static void main(String[] args) {
        String author = "jxl";
        String dbIP = "127.0.0.1";
        String dbPort = "3306";
        String dbName = "test";
        String dbUser = "test";
        String dbPwd = "test";
        String projectPath = System.getProperty("user.dir");
        String packageName = "com.framework.generator";
        String moduleName = "user";
        generate(author, dbIP, dbPort, dbName, dbUser, dbPwd, projectPath, packageName, moduleName, "user", "class", "job");
    }
}

三、看我们生成的效果