SQL腳本：

DROP TABLE IF EXISTS user;
CREATE TABLE user
(
    id BIGINT(20) NOT NULL COMMENT '主鍵ID',
    name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名',
    age INT(11) NULL DEFAULT NULL COMMENT '年齡',
    email VARCHAR(50) NULL DEFAULT NULL COMMENT '郵箱',
    PRIMARY KEY (id)
);

DELETE FROM user;

INSERT INTO user (id, name, age, email) VALUES
(1, 'Jone', 18, 'test1@baomidou.com'),
(2, 'Jack', 20, 'test2@baomidou.com'),
(3, 'Tom', 28, 'test3@baomidou.com'),
(4, 'Sandy', 21, 'test4@baomidou.com'),
(5, 'Billie', 24, 'test5@baomidou.com');

生成的數(shù)據(jù)庫(kù)結(jié)構(gòu)：

user表

Maven依賴配置

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.1.tmp</version>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.1.tmp</version>
        </dependency>

<!--        Velocity（默認(rèn)）-->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.2</version>
        </dependency>
<!--        Freemarker-->
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.30</version>
        </dependency>
<!--        Beetl-->
        <dependency>
            <groupId>com.ibeetl</groupId>
            <artifactId>beetl</artifactId>
            <version>3.1.3.RELEASE</version>
        </dependency>

    </dependencies>

Tips:懶癌患者直接復(fù)制，建議按需添加

配置代碼生成器

public class CodeGenerator   {

    /**
     * <p>
     * 讀取控制臺(tái)內(nèi)容
     * </p>
     */
    public static String scanner(String tip) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder help = new StringBuilder();
        help.append("請(qǐng)輸入" + tip + "：");
        System.out.println(help.toString());
        if (scanner.hasNext()) {
            String ipt = scanner.next();
            if (StringUtils.isNotEmpty(ipt)) {
                return ipt;
            }
        }
        throw new MybatisPlusException("請(qǐng)輸入正確的" + tip + "！");
    }

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

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath + "/src/main/java");
        gc.setAuthor("jobob");
        gc.setOpen(false);
        // gc.setSwagger2(true); 實(shí)體屬性 Swagger2 注解
        mpg.setGlobalConfig(gc);

        // 數(shù)據(jù)源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://120.55.167.13:3306/demo1?useUnicode=true&useSSL=false&characterEncoding=utf8");
        // dsc.setSchemaName("public");
        dsc.setDriverName("com.mysql.cj.jdbc.Driver");
        dsc.setUsername("賬號(hào)");
        dsc.setPassword("密碼");
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setModuleName(scanner("模塊名"));
        pc.setParent("com.zz.mybatisplusdemo");
        mpg.setPackageInfo(pc);

        // 自定義配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
                // to do nothing
            }
        };

        // 如果模板引擎是 freemarker
        String templatePath = "/templates/mapper.xml.ftl";
        // 如果模板引擎是 velocity
        // String templatePath = "/templates/mapper.xml.vm";

        // 自定義輸出配置
        List<FileOutConfig> focList = new ArrayList<>();
        // 自定義配置會(huì)被優(yōu)先輸出
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定義輸出文件名 ， 如果你 Entity 設(shè)置了前后綴、此處注意 xml 的名稱會(huì)跟著發(fā)生變化??！
                return projectPath + "/src/main/resources/mapper/" + pc.getModuleName()
                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        /*
        cfg.setFileCreate(new IFileCreate() {
            @Override
            public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) {
                // 判斷自定義文件夾是否需要?jiǎng)?chuàng)建
                checkDir("調(diào)用默認(rèn)方法創(chuàng)建的目錄");
                return false;
            }
        });
        */
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();

        // 配置自定義輸出模板
        //指定自定義模板路徑，注意不要帶上.ftl/.vm, 會(huì)根據(jù)使用的模板引擎自動(dòng)識(shí)別
        // templateConfig.setEntity("templates/entity2.java");
        // templateConfig.setService();
        // templateConfig.setController();

        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
//        strategy.setSuperEntityClass("你自己的父類實(shí)體,沒(méi)有就不用設(shè)置!");
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(true);
        // 公共父類
//        strategy.setSuperControllerClass("你自己的父類控制器,沒(méi)有就不用設(shè)置!");
        // 寫于父類中的公共字段
//        strategy.setSuperEntityColumns("id");
        strategy.setInclude(scanner("表名，多個(gè)英文逗號(hào)分割").split(","));
        strategy.setControllerMappingHyphenStyle(true);
        strategy.setTablePrefix(pc.getModuleName() + "_");
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }
}

Tips：注意對(duì)數(shù)據(jù)源配置，目錄名等關(guān)鍵字段進(jìn)行修改
生成的目錄結(jié)構(gòu)：

目錄結(jié)構(gòu)

編寫分頁(yè)參數(shù)封裝類：

@Data
public class BaseRequestUtils implements Serializable {
    private static final long serialVersionUID = -7308084942201756448L;

    /*分頁(yè)頁(yè)號(hào)*/
    private Integer pageIndex;

    /*分頁(yè)大小*/
    private Integer pageSize;

    /*模糊查詢內(nèi)容*/
    private String context;

    /*額外參數(shù)*/
    private Map<String, Object> map;
}

編寫結(jié)果返回集：

public class Result<T> {
    public static final Integer SUCCESS = 200; //成功
    public static final Integer FAILD = 500;//失敗
    public static final Integer BAD_REQUEST = 400;//錯(cuò)誤請(qǐng)求

    //狀態(tài)碼
    private Integer status;
    //消息提示
    private String msg;
    //數(shù)據(jù)
    private T data;
    //分頁(yè)數(shù)據(jù)
    private List<T> rows;
    //分頁(yè)數(shù)據(jù)總量
    private Number total;

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public List<T> getRows() {
        return rows;
    }

    public void setRows(List<T> rows) {
        this.rows = rows;
    }

    public Number getTotal() {
        return total;
    }

    public void setTotal(Number total) {
        this.total = total;
    }

    /**
     * 判斷請(qǐng)求是否成功
     * @return
     */
    public Boolean isSuccess(){
        return  this.status.intValue() == SUCCESS.intValue();
    }
}

編寫Service層代碼：

接口：

public interface IUserService extends IService<User> {

    //分頁(yè)顯示記錄
    IPage<User> getUserByPage(BaseRequestUtils baseRequestUtils);

}

實(shí)現(xiàn)類：

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private UserMapper userMapper;

    @Override
    public IPage<User> getUserByPage(BaseRequestUtils baseRequestUtils) {
        //默認(rèn)配置為第0頁(yè)，展示十條記錄
        Long pageIndex = Long.valueOf(0);
        Long pageSize = Long.valueOf(10);

        if (baseRequestUtils.getPageIndex() != null && baseRequestUtils.getPageSize() != null) {
            pageIndex = Long.valueOf(baseRequestUtils.getPageIndex());
            pageSize = Long.valueOf(baseRequestUtils.getPageSize());
        }
        IPage<User> page = new Page<>(pageIndex, pageSize);
        LambdaQueryWrapper<User> wrapper = Wrappers.lambdaQuery(User.class);

        if (baseRequestUtils.getMap() != null) {
            if (StringUtils.isNotBlank(baseRequestUtils.getMap().get("name").toString())) {
                wrapper.eq(User::getName, baseRequestUtils.getMap().get("name"));
            }
        }

        return userMapper.selectPage(page, wrapper);
    }
}

編寫Controller層代碼：

@RestController
@RequestMapping("api")
public class UserController {

    @Resource
    private IUserService userService;

    @PostMapping("query")
    public ResponseEntity<IPage<User>> testQuery(@RequestBody BaseRequestUtils baseRequestUtils) {
        IPage<User> result = userService.getUserByPage(baseRequestUtils);
        return ResponseEntity.ok(result);
    }

}

PostMan測(cè)試：

請(qǐng)求參數(shù)

調(diào)用結(jié)果

同時(shí)可以通過(guò)Map傳入條件做條件查詢（代碼中只加入了name字段，可以自行添加其他字段）：

請(qǐng)求參數(shù)

調(diào)用結(jié)果