代码一键生成

源码地址：https://github.com/nongzihong/automatic

MyBatis-Plus 官网：https://mp.baomidou.com/

起源：

dao,entity，service，controller都要自己去编写。而这部分代码，都是有一定的规范，有需求，就有对应的产品应运而生,AutoGenerator 是 MyBatis-Plus 的代码生成器，通过 AutoGenerator 可以快速生成 Entity、Mapper、Mapper XML、Service、Controller 等各个模块的代码，极大的提升了开发效率。

环境

springboot 2.2.1.RELEASE
mybatis-plus 3.3.0
spring-boot-starter-swagger 1.5.1.RELEASE

项目结构图

sql脚本

create database pro;
use pro;


SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for student
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student`  (
  `id` int(111) NOT NULL AUTO_INCREMENT COMMENT '编号',
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '姓名',
  `age` int(11) NULL DEFAULT NULL COMMENT '年龄',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES (1, '社长', 18);
INSERT INTO `student` VALUES (2, '老王', 20);
INSERT INTO `student` VALUES (3, '兰陵王', 11);

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>automatic</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>automatic</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <!--web依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--junit测试-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>


        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.0</version>
        </dependency>


        <!--代码生成模式插件  3.0.3以后需要手动设置依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.1.tmp</version>
        </dependency>


        <!--简化代码插件-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!--代码生成模板-->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.2</version>
        </dependency>


        <!-- druid阿里巴巴数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.6</version>
        </dependency>

        <!-- 热部署 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

        <!--swagger2-->
        <dependency>
            <groupId>com.spring4all</groupId>
            <artifactId>spring-boot-starter-swagger</artifactId>
            <version>1.5.1.RELEASE</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.mariadb.jdbc/mariadb-java-client -->
        <dependency>
            <groupId>org.mariadb.jdbc</groupId>
            <artifactId>mariadb-java-client</artifactId>
            <version>2.3.0</version>
        </dependency>



    </dependencies>

    <build>

        <!--打包后的项目名-->
        <finalName>codeauto</finalName>
        <!--解决mapper文件不到class文件夹的问题-->
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src\main\java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>



        <plugins>


            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>


            <!-- 1、设置jar的入口类 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>lib/</classpathPrefix>
                            <mainClass>com.example.automatic.AutoApplication</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>





            <!-- 3、打包过程忽略Junit测试 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <configuration>
                    <skip>true</skip>
                </configuration>
            </plugin>

        </plugins>
    </build>

</project>

application.yml

server:
  port: 8888

spring:
  datasource:
    # 配置数据源
    driver-class-name: org.mariadb.jdbc.Driver
    # 使用druid连接池
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mariadb://127.0.0.1:3306/pro
    username: root
    password: 123

###增加日志输出，方便定位问题
logging:
  level:
    root : warn
    com.cxyxs.mybatisplus.dao: trace
  ###控制台输出格式
  pattern:
    console: '%p%m%n'

mybatis-plus:
  mapper-locations: classpath*:/com/example/automatic/mapper/xml/*.xml
  global-config:
    db-config:
      ###逻辑未删除的值
      logic-not-delete-value: 0
      ###逻辑已删除的值
      logic-delete-value: 1


  ####扫描swagger注解
  swagger:
    base-package: com.example

配置数据库的信息，以自己的配置为主
mapper-locations 是根据自动生成代码的规则而定义的
swagger 配置swagger注解，扫描范围

启动类

package com.example.automatic;

import com.spring4all.swagger.EnableSwagger2Doc;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@MapperScan("com.example.automatic.mapper")
@SpringBootApplication
@EnableSwagger2Doc
public class AutomaticApplication {

    public static void main(String[] args) {
        SpringApplication.run(AutomaticApplication.class, args);
    }

}

@MapperScan配置扫描dao包的位置(以我们常用的思维)，社长习惯以mapper命名
@EnableSwagger2Doc 启用swagger注解

代码自动生成

package com.example.automatic;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
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.po.TableFill;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

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

@SpringBootTest
@RunWith(SpringRunner.class)
class CodeGenerationTests {


    public static void main(String[] args) {

        //代码生成器

        AutoGenerator mpg = new AutoGenerator();

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        //当前路径
        String projectPath = System.getProperty("user.dir");
        //输出路径
        gc.setOutputDir(projectPath + "/src/main/java");
        gc.setAuthor("ZH");    //设置作者
        //生成代码后，是否打开文件夹
        gc.setOpen(false);
        gc.setFileOverride(false);  //是否覆盖原来代码，个人建议设置为false,别覆盖，危险系数太高
        gc.setServiceName("%sService");   //去掉service的I前缀,一般只需要设置service就行


        gc.setDateType(DateType.ONLY_DATE);   //日期格式
        gc.setSwagger2(true);       // 实体属性 Swagger2 注解,实体类上会增加注释
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mariadb://127.0.0.1:3306/pro");
        // dsc.setSchemaName("public");
        dsc.setDriverName("org.mariadb.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("123");
        dsc.setDbType(DbType.MYSQL);    //指定数据库的类型
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent("com.example.automatic");   //自定义包的路径
        //pc.setModuleName("module");   //模块名称  设置后,会生成com.example.automatic,里面存放之前设置的mapper,entity
        pc.setEntity("entity");
        pc.setMapper("mapper");
        pc.setService("service");
        pc.setController("controller");
        mpg.setPackageInfo(pc);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setInclude("student");    //设置映射的表名，可以设置多个表

        //表前缀设置  cxyxs_student
        //strategy.setTablePrefix(new String[]{"cxyxs_"});
        //包的命名规则，使用驼峰规则
        strategy.setNaming(NamingStrategy.underline_to_camel);
        //列的名称，使用驼峰规则
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        //是否使用lombok
        strategy.setEntityLombokModel(true);
        //驼峰命名
        strategy.setRestControllerStyle(true);
        strategy.setLogicDeleteFieldName("is_delete");   //逻辑删除,假删除会用到

        //自动填充字段,在项目开发过程中,例如创建时间，修改时间,每次，都需要我们来指定，太麻烦了,设置为自动填充规则，就不需要我们赋值咯
        TableFill fillInsert = new TableFill("create_time", FieldFill.INSERT);
        TableFill fillUpdate= new TableFill("update_time", FieldFill.UPDATE);
        List fillLists = new ArrayList();
        fillLists.add(fillInsert);
        fillLists.add(fillUpdate);
        strategy.setTableFillList(fillLists);
        //乐观锁
        //strategy.setVersionFieldName("version");
        mpg.setStrategy(strategy);

        mpg.execute();  //执行


    }

}

contoller，entity,mapper,service代码都给我们生成好

swagger注释都给我们生成好咯，而且代码也很规范，让我们自己来写，可能会遇到很多很低级的错误。
虽说，代码自动生成很智能，智能的前提，是有规范的，数据库命令，最高遵守相关的规范，这里就不过多阐述咯

controller类

package com.example.automatic.controller;


import com.example.automatic.entity.Student;
import com.example.automatic.mapper.StudentMapper;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * <p>
 * 前端控制器
 * </p>
 *
 * @author ZH
 * @since 2020-04-08
 */
@RestController
@RequestMapping("/student")
public class StudentController {

    @Autowired
    private StudentMapper studentMapper;


    @GetMapping("/test")
    @ApiOperation(value = "测试接口", notes = "测试")
    public List<Student> getStudent1(Student stu) {
        List<Student> lists = studentMapper.selectList(null);
        studentMapper.selectByMap();
        return lists;
    }

    @GetMapping("/count")
    @ApiOperation(value = "统计数量", notes = "测试")
    public int getCount(){
        return studentMapper.count();
    }

}