SpringBoot实现Restful服务，基于HTTP/JSON传输

一，数据库准备

1）创建数据库

CREATE DATABASE springbootdb;

2）创建表

DROP TABLE IF EXISTS  `city`;
CREATE TABLE `city` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '城市编号',
  `province_id` int(10) unsigned  NOT NULL COMMENT '省份编号',
  `city_name` varchar(25) DEFAULT NULL COMMENT '城市名称',
  `description` varchar(25) DEFAULT NULL COMMENT '描述',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

3）插入数据

INSERT city VALUES (1001 ,110,'福建','今天很开心');

二，项目结构

SpringBoot实现Restful服务，基于HTTP/JSON传输

项目结构解读

controller控制层
dao接口层
domain实体类
service业务逻辑接口类
service impl 业务逻辑实现类
application.properties 应用配置文件，应用启动会自动读取配置

代码实现

实体层

/**
 * 城市实体类
 *
 * Created by ws on 10/12/2018.
 *  
 */
public class City {

    /**
     * 城市编号
     */
    private Long id;

    /**
     * 省份编号
     */
    private Long provinceId;

    /**
     * 城市名称
     */
    private String cityName;

    /**
     * 描述
     */
    private String description;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Long getProvinceId() {
        return provinceId;
    }

    public void setProvinceId(Long provinceId) {
        this.provinceId = provinceId;
    }

    public String getCityName() {
        return cityName;
    }

    public void setCityName(String cityName) {
        this.cityName = cityName;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

接口层

/**
 * 城市 DAO 接口类
 *
 *Created by ws on 10/12/2018.
 */
public interface CityDao {

    /**
     * 获取城市信息列表
     *
     * @return
     */
    List<City> findAllCity();

    /**
     * 根据城市 ID，获取城市信息
     *
     * @param id
     * @return
     */
    City findById(@Param("id") Long id);

    Long saveCity(City city);

    Long updateCity(City city);

    Long deleteCity(Long id);
}

接口对应的mapper层

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="org.spring.springboot.dao.CityDao">
	<resultMap id="BaseResultMap" type="org.spring.springboot.domain.City">
		<result column="id" property="id" />
		<result column="province_id" property="provinceId" />
		<result column="city_name" property="cityName" />
		<result column="description" property="description" />
	</resultMap>

	<parameterMap id="City" type="org.spring.springboot.domain.City"/>

	<sql id="Base_Column_List">
		id, province_id, city_name, description
	</sql>

	<select id="findById" resultMap="BaseResultMap" parameterType="java.lang.Long">
		select
		<include refid="Base_Column_List" />
		from city
		where id = #{id}
	</select>

	<select id="findAllCity" resultMap="BaseResultMap" >
		select
		<include refid="Base_Column_List" />
		from city
	</select>

	<insert id="saveCity" parameterMap="City" useGeneratedKeys="true" keyProperty="id">
		insert into
			city(id,province_id,city_name,description)
		values
			(#{id},#{provinceId},#{cityName},#{description})
	</insert>

	<update id="updateCity" parameterMap="City">
		update
			city
		set
		<if test="provinceId!=null">
			province_id = #{provinceId},
		</if>
		<if test="cityName!=null">
			city_name = #{cityName},
		</if>
		<if test="description!=null">
			description = #{description}
		</if>
		where
			id = #{id}
	</update>

	<delete id="deleteCity" parameterType="java.lang.Long">
		delete from
			city
		where
			id = #{id}
	</delete>
</mapper>

业务逻辑接口层

/**
 * 城市业务逻辑接口类
 *
 * Created by ws on 10/12/2018.
 */
public interface CityService {

    /**
     * 获取城市信息列表
     *
     * @return
     */
    List<City> findAllCity();

    /**
     * 根据城市 ID,查询城市信息
     *
     * @param id
     * @return
     */
    City findCityById(Long id);

    /**
     * 新增城市信息
     *
     * @param city
     * @return
     */
    Long saveCity(City city);

    /**
     * 更新城市信息
     *
     * @param city
     * @return
     */
    Long updateCity(City city);

    /**
     * 根据城市 ID,删除城市信息
     *
     * @param id
     * @return
     */
    Long deleteCity(Long id);
}

业务逻辑接口实现类

/**
 * 城市业务逻辑实现类
 *
 * Created by ws on 10/12/2018.
 */
@Service
public class CityServiceImpl implements CityService {

    @Autowired
    private CityDao cityDao;

    /**
     * 查询所有
     * @return
     */
    public List<City> findAllCity(){
        return cityDao.findAllCity();
    }

    /**
     * 根据id查找相关
     * @param id
     * @return
     */
    public City findCityById(Long id) {
        return cityDao.findById(id);
    }

    /**
     * 新增
     * @param city
     * @return
     */
    @Override
    public Long saveCity(City city) {
        return cityDao.saveCity(city);
    }

    /**
     *修改 
     * @param city
     * @return
     */
    @Override
    public Long updateCity(City city) {
        return cityDao.updateCity(city);
    }

    /**
     * 删除
     * @param id
     * @return
     */
    @Override
    public Long deleteCity(Long id) {
        return cityDao.deleteCity(id);
    }

}

controller层代码

**
 * 城市 Controller 实现 Restful HTTP 服务
 *
 * Created by ws on 10/12/2018.
 */
@RestController
@RequestMapping(value = "/api/city")
public class CityRestController {

    @Autowired
    private CityService cityService;

    /**
     * 根据id来查找
     * @param id
     * @return
     */
    @RequestMapping(value = "/{id}", method = RequestMethod.GET)
    public City findOneCity(@PathVariable("id") Long id) {
        return cityService.findCityById(id);
    }

    /**
     * 查询所有
     * @return
     */
    @RequestMapping(value = "/", method = RequestMethod.GET)
    public List<City> findAllCity() {
        return cityService.findAllCity();
    }

    /**
     * 新增
     * @param city
     */
    @RequestMapping(value = "/", method = RequestMethod.POST)
    public void createCity(@RequestBody City city) {
        cityService.saveCity(city);
    }

    /**
     * 修改
     * @param city
     */
    @RequestMapping(value = "/", method = RequestMethod.PUT)
    public void modifyCity(@RequestBody City city) {
        cityService.updateCity(city);
    }

    /**
     * 删除
     * @param id
     */
    @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
    public void modifyCity(@PathVariable("id") Long id) {
        cityService.deleteCity(id);
    }
}

数据库配置文件

## 数据源配置
spring.datasource.url=jdbc:mysql://localhost:3306/springbootdb?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

## Mybatis 配置
mybatis.typeAliasesPackage=org.spring.springboot.domain
mybatis.mapperLocations=classpath:mapper/*.xml