SpringBoot+Mybatis完成商品秒杀项目之商品模块开发（七）

于 2019-07-10 17:34:39 发布
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本文链接：https://blog.youkuaiyun.com/dong_learnning/article/details/95353708
博客围绕商品模型管理展开，涵盖商品创建、列表展示及详情页面开发。商品创建涉及领域模型设计、数据库设计、配置文件修改等；商品列表按销量排序，需创建SQL语句并实现相关方法；商品列表页面和详情页面开发中，还解决了价格数据类型不一致问题。

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商品模型管理——商品创建

1.首先设计商品领域模型

public class ItemModel {
    private Integer id;

    //商品名称
    private String title;

    //商品价格
    private BigDecimal price;

    //商品的库存
    private Integer stock;

    //商品的描述
    private String description;

    //商品的销量
    private Integer sales;

    //商品描述图片的url
    private String imgUrl;

    public Integer getId() {
        return id;
    }

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

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }

    public Integer getStock() {
        return stock;
    }

    public void setStock(Integer stock) {
        this.stock = stock;
    }

    public String getDescription() {
        return description;
    }

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

    public Integer getSales() {
        return sales;
    }

    public void setSales(Integer sales) {
        this.sales = sales;
    }

    public String getImgUrl() {
        return imgUrl;
    }

    public void setImgUrl(String imgUrl) {
        this.imgUrl = imgUrl;
    }
}

2.设计数据库

两张表：商品表和库存表（注意默认不为空，初值设为0）
3.修改pom文件

<!--允许移动生成的文件-->
<verbose>true</verbose>
<!--允许自动覆盖文件（生产环境中千万不要这样做）-->
<overwrite>false</overwrite>

4.修改mybatis-generator配置文件

添加两张表

运行 mvn mybatis-generator:generate

5.修改mapper的xml文件

把insert和insertSelective方法后添加属性 keyProperty=“id” useGeneratedKeys=“true”"，使其保持自增

6.创建ItemService接口

public interface ItemService {

    //创建商品
    ItemModel createItem(ItemModel itemModel);

    //商品列表浏览
    List<ItemModel> listItem();


    //商品详情浏览
    ItemModel getItemById(Integer id);
}

7.ItemServiceImpl实现类

入参校验

//商品名称
@NotBlank(message = "商品名称不能为空")
private String title;

//商品价格
@NotNull(message = "商品价格不能为空")
@Min(value = 0,message = "商品价格必须大于0")
private BigDecimal price;

//商品的库存
@NotNull(message = "库存不能不填")
private Integer stock;

//商品的描述
@NotBlank(message = "商品描述信息不能为空")
private String description;

//商品的销量
@NotBlank(message = "商品图片信息不能为空")
private Integer sales;

//商品描述图片的url
private String imgUrl

实现方法 ItemServiceImpl.java

@Service
public class ItemServiceImpl implements ItemService {

    @Autowired
    private ValidatorImpl validator;

    @Autowired
    private ItemDOMapper itemDOMapper;

    @Autowired
    private ItemStockDOMapper itemStockDOMapper;

    @Override
    @Transactional
    public ItemModel createItem(ItemModel itemModel) throws BusinessException {

        //校验入参
        ValidationResult result = validator.validate(itemModel);
        if (result.isHasErrors()) {
            throw new BusinessException(EmBusinessError.PARAMETER_VALIDATION_ERROR, result.getErrMsg());
        }
        //转化itemmodel->dataobject
        ItemDO itemDO = this.convertItemDOFromItemModel(itemModel);

        //写入数据库
        itemDOMapper.insertSelective(itemDO);
        itemModel.setId(itemDO.getId());

        ItemStockDO itemStockDO = this.convertItemStockDOFromItemModel(itemModel);
        itemStockDOMapper.insertSelective(itemStockDO);

        //返回创建完成的对象
        return this.getItemById(itemModel.getId());

    }

    private ItemDO convertItemDOFromItemModel(ItemModel itemModel) {
        if (itemModel == null) {
            return null;
        }
        ItemDO itemDO = new ItemDO();
        BeanUtils.copyProperties(itemModel, itemDO);
        return itemDO;
    }

    private ItemStockDO convertItemStockDOFromItemModel(ItemModel itemModel) {
        if (itemModel == null) {
            return null;
        }
        ItemStockDO itemStockDO = new ItemStockDO();
        itemStockDO.setItemId(itemModel.getId());
        itemStockDO.setStock(itemModel.getStock());

        return itemStockDO;
    }

    @Override
    public List<ItemModel> listItem() {
        return null;
    }

    @Override
    public ItemModel getItemById(Integer id) {
        ItemDO itemDO = itemDOMapper.selectByPrimaryKey(id);
        if (itemDO == null) {
            return null;
        }
        //操作获得库存数量
        ItemStockDO itemStockDO = itemStockDOMapper.selectByItemId(itemDO.getId());

        //将dataobject-> Model
        ItemModel itemModel = convertModelFromDataObject(itemDO, itemStockDO);
        return itemModel;
    }

    private ItemModel convertModelFromDataObject(ItemDO itemDO, ItemStockDO itemStockDO) {
        ItemModel itemModel = new ItemModel();
        BeanUtils.copyProperties(itemDO, itemModel);
        itemModel.setStock(itemStockDO.getStock());
        return itemModel;
    }
}

8.ItemController

@Controller("/item")
@RequestMapping("/item")
//跨域请求中，不能做到session共享
@CrossOrigin(origins = {"*"}, allowCredentials = "true")
public class ItemController extends BaseController {

    @Autowired
    private ItemService itemService;

    //创建商品的controller
    @RequestMapping(value = "/create", method = {RequestMethod.POST}, consumes = {CONTENT_TYPE_FORMED})
    @ResponseBody
    public CommonReturnType createItem(@RequestParam(name = "title") String title,
                                       @RequestParam(name = "description") String description,
                                       @RequestParam(name = "price") BigDecimal price,
                                       @RequestParam(name = "stock") Integer stock,
                                       @RequestParam(name = "imgUrl") String imgUrl) throws BusinessException {
        //封装service请求用来创建商品
        ItemModel itemModel = new ItemModel();
        itemModel.setTitle(title);
        itemModel.setDescription(description);
        itemModel.setPrice(price);
        itemModel.setStock(stock);
        itemModel.setImgUrl(imgUrl);

        ItemModel itemModelForReturn = itemService.createItem(itemModel);
        ItemVO itemVO = convertVOFromModel(itemModelForReturn);
        return CommonReturnType.create(itemVO);

    }

    private ItemVO convertVOFromModel(ItemModel itemModel) {
        if (itemModel == null) {
            return null;
        }
        ItemVO itemVO = new ItemVO();
        BeanUtils.copyProperties(itemModel, itemVO);
        return itemVO;
    }

}

9.商品详情页浏览

@RequestMapping(value = "/get", method = {RequestMethod.GET})
@ResponseBody
public CommonReturnType getItem(@RequestParam(name = "id") Integer id) {
    ItemModel itemModel = itemService.getItemById(id);

    ItemVO itemVO = convertVOFromModel(itemModel);

    return CommonReturnType.create(itemVO);
}

2 商品模型管理——商品列表
假设我们的需求是按照销量从高到低显示所有商品

1.创建sql语句

在ItemDOMapper.xml中新建方法

<select id="listItem"  resultMap="BaseResultMap">

  select
  <include refid="Base_Column_List" />
  /*通过销量倒序排序*/
  from item ORDER BY sales DESC;
</select>

2.在ItemDOMapper中创建方法

List listItem();

3.在ItemServiceImpl中实现方法

@Override
public List<ItemModel> listItem() {
    List<ItemDO> itemDOList = itemDOMapper.listItem();

    //使用Java8的stream API
    List<ItemModel> itemModelList = itemDOList.stream().map(itemDO -> {
        ItemStockDO itemStockDO = itemStockDOMapper.selectByItemId(itemDO.getId());
        ItemModel itemModel = this.convertModelFromDataObject(itemDO, itemStockDO);
        return itemModel;
    }).collect(Collectors.toList());

    return itemModelList;
}

4.controller层

//商品列表页面浏览
@RequestMapping(value = "/list", method = {RequestMethod.GET})
@ResponseBody
public CommonReturnType listItem() {
    List<ItemModel> itemModelList = itemService.listItem();
    List<ItemVO> itemVOList = itemModelList.stream().map(itemModel -> {
        ItemVO itemVO = this.convertVOFromModel(itemModel);
        return itemVO;
    }).collect(Collectors.toList());

    return CommonReturnType.create(itemVOList);
}

3 商品模型管理——商品列表页面
1.新建listItem.html

 <div class="content">
        <h3  style="text-align:center;" class="form-title">商品列表浏览 </h3>
       <div class="table-responsive">
         <table class="table">
         	<div>
         	<thead>
         		<tr>
         			<th>商品名</th>
         			<th>商品图片</th>
         			<th>商品描述</th>
         			<th>商品价格</th>
         			<th>商品库存</th>
         			<th>商品销量</th>
         			
         		</tr>
         	</thead>
         	<tbody id="container">
         	
         	</tbody>
         	</div>
         </table>
       
       
       </div>
    </div>

</body>

<script>
//定义全局商品数组信息
    var g_itemList=[];
    jQuery(document).ready(function () {
   
            $.ajax({
                type:"GET",            
                url:"http://localhost:8080/item/list",
                
                
                //允许跨域请求
                xhrFields:{withCredentials:true},
                success:function (data) {
                    if (data.status=="success") {
                        alert("获取商品信息成功");
                        g_itemList=data.data;
                        reloadDom();
                    }else {
                        alert("获取商品信息失败，原因为" + data.data.errMsg);
                    }
                },
                error:function (data) {
                    alert("获取商品信息失败，原因为"+data.responseText);
                }
            });
            
        
    });
    function reloadDom(){
    for(var i=0;i<g_itemList.length;i++){
    	var itemVO=g_itemList[i];
    	var dom="<tr data-id='"+itemVO.id+"' id='itemDetail"+itemVO.id+"'><td>"+itemVO.title+"</td><td><img style='width:100px;height:auto;' src='"+itemVO.imgUrl+"'/></td><td>"+itemVO.description+"</td><td>"+itemVO.price+"</td><td>"+itemVO.stock+"</td><td>"+itemVO.sales+"</td></tr>";
    	$("#container").append($(dom));
    	$("#itemDetail"+itemVO.id).on("click",function(e){
    	window.location.href="getitem.html?id="+$(this).data("id");
    	});
    }
    
    }
</script>

测试：价格为null。原因：price的数据类型不一致。
在将dataobject-> Model时，
itemModel.setPrice(new BigDecimal(itemDO.getPrice()));
4 商品模型管理——商品详情页面
创建getitem.html

<body class="login">
<div class="content">
    <h3 class="form-title">商品详情</h3>
   

        <div>
            <label class="control-lable" id="title"/></label>
        </div>
    </div>
    <div class="form-group">
        <label class="control-label">商品描述</label>
        <div>
            <label class="control-lable" id="description"/></label>
        </div>
    </div>
    <div id="normalprice" class="form-group">
        <label class="control-label">价格</label>
        <div>
            <label class="control-label" id="price"/></label>
        </div>
    </div>
  

        <div>
            <img style="width: 200px;height: auto;" id="imgUrl" />
        </div>
    </div>
    <div class="form-group">
        <label class="control-label">库存</label>
        <div>
            <label class="control-label" id="stock" /></label>
        </div>

    </div>
    <div class="form-group">
        <label class="control-label">销量</label>
        <div>
            <label class="control-label" id="sales" /></label>
        </div>

    </div>
   
</div>
</body>
<script>
    function getParam(paramName) {
        paramValue = "", isFound = !1;
        if (this.location.search.indexOf("?") == 0 && this.location.search.indexOf("=") > 1) {
            arrSource = unescape(this.location.search).substring(1, this.location.search.length).split("&"), i = 0;
            while (i < arrSource.length && !isFound) arrSource[i].indexOf("=") > 0 && arrSource[i].split("=")[0].toLowerCase() ==  paramName.toLowerCase() && (paramValue = arrSource[i].split("=")[1], isFound = !0), i++  }

        return paramValue == "" && (paramValue = null), paramValue
    }
    var g_itemVO = {}
    jQuery(document).ready(function(){

     
        //获取商品详情
        $.ajax({
            type:"GET",

            url:"http://localhost:8080/item/get",
            xhrFields:{withCredentials:true},
            data:{
                "id":getParam("id"),
            },
            success:function(data){
                if(data.status =="success"){
                    g_itemVO = data.data;
                    reloadDom();
                    
                }else{
                    alert("获取商品详情失败！原因为"+data.data.errMsg);
                }
            },
            error:function(data){
                alert("获取商品详情失败！原因为"+data.responseText);
            }
        });

    });
    function reloadDom(){
        $("#title").text(g_itemVO.title);
        $("#description").text(g_itemVO.description);
        $("#stock").text(g_itemVO.stock);
        $("#price").text(g_itemVO.price);
        $("#imgUrl").attr("src",g_itemVO.imgUrl);
        $("#sales").text(g_itemVO.sales);
      }

</script>
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