＜Spring Boot＞开发基于三层架构设计：Dao层、Service层、Controller层及案例一

三层架构设计：基于Spring Boot开发要使用三层架构：

数据访问层（Dao）、业务逻辑层（Service）、控制层（Control-ler）

（1）数据访问层（Dao）：Dao层是最底层的设计，用户操作数据库。通过MyBatis持久化实现接口开发，XML文件。Dao层的设计步骤：1、在数据库中生成数据库表 2通过XML文件实现数据库的映射和操作。

（2）业务逻辑层（Service）：Service层是中间层，在Dao层和Controller层之间进行逻辑处理工作。考虑到程序 的耦合度问题，为了降低各个模块的关联，每个接口都封装有各自的业务处理方法。

（3）控制层（Controller）：Controller是第三层，通过调用Service层，与前端页面交互。

CRUD案例如下：

Controller层：

@Slf4j
@RestController
@RequestMapping("/xxxList")
public class XxxListController {

    @Autowired
    private XxxListService xxxListService;
	
	/**
     * 查询：配置
     * 权限-管理员
     *
     * @param param
     * @return
     */
    @PostMapping(value = "/selectXxxConfig")
    @AuthInterceptor("mg:getXxx:selectXxxConfig")
    public Result selectXxxConfig(@RequestBody String param) {
        try {
            Map<String, Object> paramMap = JsonUtils.readValue(param, Map.class);
            return Result.success().result(xxxListService.selectXxxConfig(paramMap));
        } catch (Exception e) {
            log.error("XxxListController selectXxxConfig is error===:" + e.getMessage(), e);
            return Result.failure("查询失败");
        }
    }
	
	/**
     * 新增/修改：配置
     * 权限-管理员
     *
     * @param param
     * @return
     */
    @PostMapping(value = "/addOrModifyXxxConfig")
    @AuthInterceptor("mg:getXxx:addOrModifyXxxConfig")
    public Result addOrModifyXxxConfig(@RequestBody String param) {
        try {
            Map<String, Object> paramMap = JsonUtils.readValue(param, Map.class);
            xxxListService.addOrModifyXxxConfig(paramMap);
        } catch (Exception e) {
            log.error("XxxListController addOrModifyXxxConfig is error===:" + e.getMessage(), e);
            return Result.failure("更新失败");
        }
        return Result.success().result(null);
    }
	
	/**
     * 删除：表单数据
     * 权限-管理员
     *
     * @param param
     * @return
     */
    @PostMapping(value = "/deleteData")
    @AuthInterceptor("mg:getXxx:deleteData")
    public Result deleteFormData(@RequestBody String param) {
        try {
            Map<String, Object> paramMap = JsonUtils.readValue(param, Map.class);
            xxxListService.deleteData(paramMap);
        } catch (Exception e) {
            log.error("XxxListController deleteData is error===:" + e.getMessage(), e);
            return Result.failure("数据删除失败");
        }
        return Result.success().result(null);
    }
    
}	

Servicer层：

	
public interface XxxListService {

    //查询：配置
    PageInfo<Map<String, Object>> selectXxxConfig(Map<String, Object> paramMap);
	
    //新增/修改：配置
    Result addOrModifyXxxConfig(Map<String, Object> paramMap);
	
	//删除：表单数据
    void deleteData(Map<String, Object> paramMap);

}

ServicerImpl层：

	
@Slf4j
@Service
public class XxxListServiceImpl implements XxxListService {

	@Autowired
    private XxxListMapper xxxListMapper;
	
	/*
     * 查询：配置
     *
     */
    @Override
    public PageInfo<Map<String, Object>> selectXxxConfig(Map<String, Object> paramMap) {；
        CommonUtil.getPageHelper(paramMap);
        List<Map<String, Object>> list = xxxListMapper.selectXxxConfig(paramMap);
        PageInfo<Map<String, Object>> result = new PageInfo<>(list);
        return result;
    }	
	
	/*
     * 新增/修改：配置
     *
     */
    @Override
    public Result addOrModifyXxxConfig(Map<String, Object> paramMap) {
        String addOrModify = String.valueOf(paramMap.get("addOrModify"));
        if(addOrModify.equals("add")){
            paramMap.remove("addOrModify");
            List<Map<String,String>> reg = getRegionList();  // 获取地域信息
            List<Map<String,String>> list = xxxListMapper.selectXxxRegAll();  // 查询本数据库地域信息
            Iterator<Map<String, String>> iterator = reg.iterator();
            while (iterator.hasNext()){
                Map<String, String> next = iterator.next();
                String name = String.valueOf(next.get("name"));
                String code = String.valueOf(next.get("code"));
                next.put("isEnable","1");
                Iterator<Map<String, String>> iterator2 = list.iterator();
                while (iterator2.hasNext()){
                    Map<String, String> next2 = iterator2.next();
                    String regionName = String.valueOf(next2.get("name"));
                    String RegionCode = String.valueOf(next2.get("code"));
                    if(name.equals(regionName) && code.equals(RegionCode)){
                        iterator.remove();
                    }
                }
            }
            if(reg.size() > 0){
                xxxListMapper.addXxxConfig(reg);
            }
        }
        else if(addOrModify.equals("modify")){  // "isEnableVal",1:"使用",2:"停用"
            String sortId = String.valueOf(paramMap.get("sortId"));
            String isEnable = String.valueOf(paramMap.get("isEnable"));
            if(!sortId.equals("null") && !sortId.equals("") || !isEnable.equals("null") && !isEnable.equals("")){
                xxxListMapper.modifyXxxConfig(paramMap);
            }
        }
        return Result.success().result(null);
    }
	
	/*
     * 删除：表单数据
     *
     */
    @Override
    public void deleteData(Map<String, Object> paramMap) {
        xxxListMapper.deleteData(paramMap);
    }
    
}

Mapper层（又称Dao层）：

	
@Mapper
public interface XxxListMapper {

	//查询：所有配置(先查所有配置)
    List<Map<String, String>> selectXxxRegAll();

    //查询：配置
    List<Map<String, Object>> selectXxxConfig(Map<String, Object> paramMap);
	
	//新增：配置
    void addXxxConfig(List<Map<String, String>> paramList);
	
	//修改：配置
    void modifyXxxConfig(Map<String, Object> paramMap);
	
	//删除：表单数据
    void deleteData(Map<String, Object> paramMap);
	
}

Mapper.xml层（MyBatis层）：文章来源地址https://www.toymoban.com/news/detail-612904.html

	
<?xml version="1.0" encoding="UTF-8"?>
<!--约束条件-->
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--命名空间：找到所在的XxxListMapper接口的位置-->
<mapper namespace="com.itheima.service.mapper.XxxListMapper">

<!--sql语句代码-->
	
	<!-- 查询：所有配置(先查所有配置) -->
    <select id="selectXxxRegAll" resultType="map">
        SELECT *
        FROM xxx_region_list_dic where 1 = 1
    </select>
	
	<!-- 查询：配置 -->
    <select id="selectXxxConfig" parameterType="map" resultType="map">
        SELECT *
        FROM xxx_region_list_dic where 1 = 1
        <!-- 分页字段 -->
        <if test="null != processResult">
            and processResult = #{processResult}
        </if>
        <if test="null != name and '' != name">
            and name = #{name}
        </if>
        <if test="null != code and '' != code">
            and code = #{code}
        </if>
        <if test="null != isEnable and '' != isEnable">
            and isEnable = #{isEnable}
        </if>
        order by sortId
    </select>
	
	<!-- 新增：配置 -->
    <insert id="addXxxConfig" parameterType="java.util.List">
        <foreach collection="list" item="region" index="index" separator=";">
            INSERT IGNORE INTO xxx_region_list_dic
            <foreach collection="region.entrySet()" index="key" separator="," open="(" close=")">
                ${key}
            </foreach>
            VALUES
            <foreach collection="region.entrySet()" item="value" separator="," open="(" close=")">
                #{value}
            </foreach>
        </foreach>
    </insert>

	<!-- 修改：配置 -->
    <update id="modifyXxxConfig" parameterType="map">
        update xxx_region_list_dic
        <set>
            <if test = "null != sortId and '' != sortId">
                sortId = #{sortId},
            </if>
            <if test = "null != isEnable and '' != isEnable">
                isEnable = #{isEnable}
            </if>
        </set>
        where
        <if test = "null != seqId and '' != seqId">
            seqId = #{seqId}
        </if>
    </update>
	
	
	<!-- 删除：表单数据 -->
    <delete id="deleteData">
        delete from xxx_form_data_list
        where
        <if test = "null != No and '' != No">
            No = #{No}
        </if>
    </delete>
	
</mapper>

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