專案說明：

1.開發工具： Idea（2017.1.5）,jdk1.8

使用框架，資料庫，jar庫依賴：SpringBoot+Mybtis， Mysql， Gradle4.0

後臺測試使用：Swagger2

2. 本專案模仿的需求： 商品的動態查詢

3，程式碼展示和說明：

(1)掃描dao層需要在專案入口：加上註解掃描@MapperScan("so.sao.dao")，或者在自己的dao裡面的介面上面加@Mapper

掃描service層需要在是實現類加@service

      (2)下面寫的配置的.xml檔案，需要和資料庫連線等資訊一起在resources/application.properties 加自己的配置

如： mybatis.mapperLocations=classpath:mapper/*.xml

3.1 domain層 : 建立實體物件類：Commodity  and  CommType, 根據需求列名自己定義幾個列（欄位）。

Page(效驗自己的分頁引數)

Page實體類如下參考！

/**

 * 當前頁數
 */
private int pageNumber;

/**
 * 頁面大小
 */
private int pageSize;

public Page() {
}

public Page(int pageNumber, int pageSize) {
    this.pageNumber 
 
= pageNumber;
    this.pageSize = pageSize;
}

3.2 web層(Controller)

CommunityController（商品的控制層）：商品的動態查詢

/**
 * Created by XuPengFei on 2017/7/13.

*/@RestController@RequestMapping(value = "/Commodity")public class CommodityController { @Autowiredprivate CommodityService commodityService; /** http://localhost:8080/Commodity/searchCommdityByCondition/2/2

* Through all parameters(you can give one param or any more param) to search Commdity. * @param firstType* @param secondType* @param secondType* @param commName* @param price01* @param price02* @param pageNumber* @param pageSize* @return PageInfo<Commodity> */@ApiOperation(value = "searchCommBySearchBy", notes = "Search Commidty By Search condition: XUPENGFEI") @ApiImplicitParams({ @ApiImplicitParam(name ="firstType",value ="First Type",required = false,dataType = "String", paramType = "query"), @ApiImplicitParam(name ="secondType",value ="First Type",required = false,dataType = "String",paramType = "query"), @ApiImplicitParam(name ="commName",value ="Commdity name",required = false,dataType = "String",paramType = "query"), @ApiImplicitParam(name ="price01",value ="First price",required = false,dataType = "Double",paramType = "query"), @ApiImplicitParam(name ="price02",value ="Second price",required = false,dataType = "Double",paramType = "query") }) @RequestMapping(value = "/searchCommdityByCondition/{pageNumber}/{pageSize}", method = RequestMethod.GET) public PageInfo<Commodity> searchCommodityByCondition(String firstType, String secondType, String commName, Double price01, Double price02, @PathVariable Integer pageNumber, @PathVariable Integer pageSize) { PageInfo<Commodity> pageInfo = commodityService.searchCommodityByCondition(firstType,secondType,commName,price01,price02,pageNumber,pageSize); return pageInfo; }}

3.2 service層，此處介面省略，直接給出實現類： 

/**
 * Created by 

XuPengFei 

on 2017/7/13. */@Servicepublic class CommodityServiceImpl implements CommodityService{ @Autowiredprivate CommodityMapper commodityMapper; /** * Through all parameters(you can give one param or any more param) to search Commdity. * @param firstType* @param secondType* @param commName* @param price01* @param price02 * @param pageNumber* @param pageSize* @return PageInfo<Commodity> */@Overridepublic PageInfo<Commodity> searchCommodityByCondition(String firstType, String secondType, String commName, Double price01, Double price02, Integer pageNumber, Integer pageSize) { if(null!=firstType){ firstType = firstType.trim(); } if(null!=secondType){ secondType = secondType.trim(); } if(null!=commName){ commName = commName.trim(); } firstType = firstType == "" ? null: firstType; secondType = secondType == "" ? null: secondType; commName = commName == "" ? null : commName; if(null!= price01){ price01 = price01 >= 0 ? price01 : 0.00; }else { price01 =0.00; } if(null!= price02){ price02 = price02 >= price01 ? price02 : price01; } Page pp = new Page(pageNumber,pageSize); pp = PageUtil.pageParamCheck(pp); PageHelper.startPage(pp.getPageNumber(),pp.getPageSize()); List<Commodity> commodityList = commodityMapper.findPageCommodityBySearch(firstType,secondType,commName,price01,price02); PageInfo<Commodity> pageInfo = new PageInfo(commodityList); return pageInfo; }}

3.2 dao層(Mapper介面)： 

public interface CommodityMapper {

    /**
     * Through all parameters(you can give one param or any more param) to search Commdity.
     * @param firstType
* @param secondType
* @param commName
* @param price01
* @param price02
* @return List<Commodity>
     */
public List<Commodity> findPageCommodityBySearch(@Param("firstType") String firstType, @Param("secondType") String secondType, @Param("commName") String commName,
                                                     @Param("price01") Double price01, @Param("price02") Double price02);
}

3.3 resource 下自己建立mapper包，裡面放自己的xml檔案

CommodityMapper.xml如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPEmapperPUBLIC"-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="so.sao.dao.CommodityMapper">
    <resultMap id="BaseResultMap" type="so.sao.domain.Commodity">
        <id column="ID" property="id"/>
        <result column="COMM_NAME" property="name"/>
        <result column="COMM_DESCRIBE" property="describe"/>
        <result column="FIRSTTYPE" property="firstType"/>
        <result column="SECONDTYPE" property="secondType"/>
        <result column="THIRDTYPE" property="thirdType"/>
        <result column="NUM" property="num"/>
        <result column="NUM69" property="num69"/>
        <result column="BRAND" property="brand"/>
        <result column="COMM_NO" property="no"/>
        <result column="WEIGHT" property="weight"/>
        <result column="DUCTIONDATE" property="ductionDate"/>
        <result column="MINIMG" property="minImg"/>
        <result column="MAXIMG" property="maxImg"/>
        <result column="PRICE" property="price"/>
        <result column="PAYPRICE" property="payPrice"/>
        <result column="ADDESC" property="adDesc"/>
        <result column="COMM_STATUS" property="status"/>
        <result column="CREATEDUSER" property="createdUser"/>
        <result column="CREATEDAT" property="createdAt"/>
        <result column="UPDATEDAT" property="updatedAt"/>
    </resultMap>

    <!-- Through all parameters(you can give one param or any more param) to search Commdity-->
<select id="findPageCommodityBySearch" resultMap="BaseResultMap">
        SELECT ID,COMM_NAME,COMM_DESCRIBE,FIRSTTYPE,SECONDTYPE,THIRDTYPE,NUM,NUM69,BRAND,
        COMM_NO,WEIGHT,DUCTIONDATE,MINIMG,MAXIMG,PRICE,PAYPRICE,ADDESC,COMM_STATUS,CREATEDUSER,CREATEDAT,UPDATEDAT
        FROM TB_COMMODITY tb01
        <where>
            <if test="firstType != null">
                AND tb01.FIRSTTYPE = #{firstType}
            </if>
            <if test="secondType != null">
                AND tb01.SECONDTYPE = #{secondType}
            </if>
            <if test="commName != null">
                AND tb01.COMM_NAME LIKE CONCAT ('%',#{commName},'%')
            </if>
            <if test="price01 != null and price02!=null">
                AND tb01.PRICE BETWEEN #{price01} AND #{price02}
            </if>
        </where>
    </select>
</mapper>

3.4 前面用到的工具類：新建一個Util包

------------PageUtil類如下：

public class PageUtil{

    public static Page pageParamCheck(Page page)
    {
        int pageNum = page.getPageNumber();
        int pageSize = page.getPageSize();
        //分頁引數校驗、處理
pageNum = pageNum > 0 ? pageNum : PageConstant.PAGE_NUM_DEFAULT;
        pageSize = pageSize > 0 ? pageSize : PageConstant.PAGE_SIZE_DEFAULT;
        pageNum = pageNum < 500 ? pageNum : PageConstant.PAGE_NUM_MAX_DEFAULT;
        pageSize = pageSize < 50 ? pageSize : PageConstant.PAGE_SIZE_MAX_DEFAULT;

        page.setPageNumber(pageNum);
        page.setPageSize(pageSize);
        return page;
    }
}

------PageConstant(常量類,名字不好，其實大家可以起名Constant存放所有本專案用到的常量)

/**
 * pagesize預設值10
 */
public static final int PAGE_SIZE_DEFAULT = 10 ;
/**
 * pagenume預設值1
 */
public static final int PAGE_NUM_DEFAULT = 1 ;
/**
 * pagesize最大預設值50
 */
public static final int PAGE_SIZE_MAX_DEFAULT = 50 ;
/**
 * pagenume最大預設值500
 */
public static final int PAGE_NUM_MAX_DEFAULT = 500 ;