springBoot+mybatisPlus小demo

项目介绍：采用restful api进行接口规范 / 项目框架SpringBoot+mybatis Plus / 采用mysql进行数据存储 / 采用swaggerUI进行前后端业务分离式开发。

开发环境：JDK1.8+Mysql8.0.12+IDEAL

实现功能：springboot搭建整体框架，MybatisPlus动态生成Dao+Services+Entity+Controller结构

项目介绍：无实际的业务操作，都是测试功能。其中为了区别mybastis和mybatisPlus，特意写了两个接口分别采用mapper.xml进行dao层操作和采用Iservice提供的CRUD操作进行数据查询。

ps:如果对springboot和mybayisPlus已了解，可直接访问码云进行demo下载 https://gitee.com/xc199534/SpringBootMybatisPlus/

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1.项目整体结构

其中Config中包括MybatisPlusConfig和SwaggerConfig两个类，分别用于初始化MybatisPlus和Swagger基础设置。

数据库结构，采用navicat进行可视化管理。

2.配置文件application.properties

也可采用.yml格式进行配置文件设置，本项目是使用.properties。

spring.application.name=spring-boot-config

server.port=8080
server.context-path=/#mybatis mapper文件的位置
mybatis.mapper-locations=classpath*:mapper/*.xml
#扫描pojo类的位置,在此处指明扫描实体类的包，在mapper中就可以不用写pojo类的全路径名了
mybatis.type-aliases-package=com.example.demo
#可以通过mybatis.config-location属性来指定mybatis的配置文件的位置，
#mybatis.config-location=classpath:mybatis-config.xml

#数据库参数设置
jdbc.type=mysql
spring.datasource.url=jdbc:mysql://localhost:3306/demo
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

3.pom.xml内容（所有不上项目完整pom.xml的demo都是耍流氓）

<dependencies><!-- Springboot--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.data</groupId><artifactId>spring-data-elasticsearch</artifactId></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><!-- <version>2.1.3</version>   --></dependency><dependency><groupId>net.java.dev.jna</groupId><artifactId>jna</artifactId><!-- <version>3.0.9</version> --></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId><scope>provided</scope></dependency><!-- 阿里巴巴druid数据库连接池 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency><!-- mysql驱动 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!-- mybatisplus与springboot整合 --><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>2.3</version></dependency><!-- 模板引擎 --><dependency><groupId>org.apache.velocity</groupId><artifactId>velocity</artifactId><version>1.7</version></dependency><!--swagger--><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>2.9.2</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>2.9.2</version></dependency></dependencies>

3.自动生成代码(Dao/service/Entity)

调用MpGenerator.java的主函数生成定义好MVC层结构(MpGenerator定义了文件位置，文件名称，依赖关系等属性)。

Dao层：生成*Dao.java文件和*Dao.xml，后者可理解为Dao层的数据库映射操作,mybatis支持在.xml文件中写数据库CURD语句，但myatisPlus支持使用内置的CRUD操作，避免了复杂的数据库语句。

Service层：生成一个接口文件，一个接口实现类。

Entity层：生成实体类，对应到数据库的表结构。

SchoolDao.java

package com.example.demo.dao;import com.baomidou.mybatisplus.mapper.BaseMapper;
import com.example.demo.entity.School;
import org.apache.ibatis.annotations.Param;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;public interface SchoolDao extends BaseMapper<School> {School getSchoolById(@Param("id") int id);
}

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SchoolService.java

import com.baomidou.mybatisplus.service.IService;
import com.example.demo.entity.School;
import org.elasticsearch.index.query.QueryStringQueryBuilder;public interface SchoolService extends IService<School> {public School getSchoolById(int id);// public Iterable<School> searchByES(QueryStringQueryBuilder builder);

}

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SchoolServiceImpl.java

import com.baomidou.mybatisplus.service.impl.ServiceImpl;
import com.example.demo.dao.SchoolDao;
import com.example.demo.entity.School;
import com.example.demo.services.SchoolService;
import org.elasticsearch.index.query.QueryStringQueryBuilder;
import org.springframework.stereotype.Service;import java.util.List;@Service
public class SchoolServiceImpl extends ServiceImpl<SchoolDao, School> implements SchoolService {@Overridepublic School getSchoolById(int id) {return baseMapper.selectById(id);}
}

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School.java

import com.baomidou.mybatisplus.annotations.TableField;
import com.baomidou.mybatisplus.annotations.TableId;
import com.baomidou.mybatisplus.annotations.TableName;
import org.springframework.data.elasticsearch.annotations.Document;import java.io.Serializable;@TableName("school")
@Document(indexName = "education", type = "school")
public class School implements Serializable {@TableId("ID")private int id;@TableField("NAME")private String name;@TableField("RANGE")private int range;@TableField("AGE")private int age;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getRange() { return range; }public void setRange(int range) { this.range = range; }public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "School{" +"id=" + id +", name='" + name +", range=" + range +", age=" + age +'}';}
}

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4、Controller层

@RestController
@RequestMapping("/")
public class SampleController {@Autowiredprivate UserService userService;@Autowiredprivate SchoolService schoolService;@Autowiredprivate testDao testdao;@Autowiredprivate ElasticsearchTemplate elasticsearchTemplate;@ApiOperation(value = "测试")@GetMapping("/home")String home() {return "Hello World!";}@RequestMapping(value = "/getUser", method = RequestMethod.GET)public User helloUser() {User user = userService.getUserById(1);System.out.println(user);return user;}@ApiOperation(value = "采取mybatis方式查询")@ApiImplicitParam(name = "id", value = "用户id", paramType = "path", required = true)@GetMapping("/getSchool/maybatis/{id}")public School helloSchool1(@PathVariable("id") int id) {School school = schoolService.getSchoolById(id);System.out.println(school);return school;}@ApiOperation(value = "采取mybatis-plus方式查询")@ApiImplicitParam(name = "id", value = "用户id", paramType = "path", required = true)@GetMapping("/getSchool/maybatis-plus/{id}")public School helloSchool2(@PathVariable("id") int id) {School school = schoolService.selectById(id);System.out.println(school);return school;}@ApiOperation(value = "插入数据")@ApiImplicitParam(name = "school", value = "学校信息", paramType = "body", required = true)@PostMapping("/insert/school")public Boolean insertSchool(@RequestBody School school) {Boolean tag = schoolService.insert(school);System.out.println(tag);return tag;}
}

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5、调用主程序启动

@SpringBootApplication
@MapperScan("com.example.demo.dao")
@ComponentScan(basePackages = {"com.example.demo.config","com.example.demo.controller","com.example.demo.services"})
public class DemoApplication {public static void main(String[] args) {//System.setProperty("es.set.netty.runtime.available.processors", "false");SpringApplication.run(DemoApplication.class, args);}
}