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查询所有商品分类

遍历每个分类

如果能查到父级，就将子类放入父级中

根据分类Id查询商品列表

最后将查询到的商品放入分类中

controller代码

@GetMapping("/list")

@ApiOperation(value = "分类下的商品", notes = "所有分类包含商品", produces = "application/json")

public ResultPoJo> getCategoryproducts(Pagination pagination,String keyword) {

LambdaQueryWrapper queryWrapper = new LambdaQueryWrapper().orderByAsc(YxJpProductCategory::getSort).orderByDesc(YxJpProductCategory::getCreateDate);

CommonUtil.emptyStr(keyword).ifPresent(key -> queryWrapper.and(andQw ->

andQw.or(orQw -> orQw.like(YxJpProductCategory::getName, key))

));

// 查询所有分类

List categoryList = categoryService.list(queryWrapper);//查询所有分类

List rsList = categoryList;

if (StrUtil.isBlank(keyword)) {//关键字为空(用于搜索)

categoryList.forEach(category -> {//遍历每个分类

if (!"0".equals(category.getParentId())) {//父id不等于0 (0为顶级分类)

//查找父级分类(包含子类)

categoryList.stream().filter(ca -> ca.getId().equals(category.getParentId())).findFirst()

.ifPresent(parentCategory -> {//如果存在父子关系

List children = parentCategory.getChildren();

if (ObjectUtil.isNull(children)) {

children = Lists.newArrayList();

}

//根据商品分类查询商品

IPage page = productService.getJpProductByCategory(pagination.page(),keyword,category.getId());

category.setProducts(page);

//将子级放到父级的children中

children.add(category);

parentCategory.setChildren(children);

});

}

});

rsList = categoryList.stream().filter(category -> "0".equals(category.getParentId())).collect(Collectors.toList());

}

return ResultPoJo.ok(rsList);

}

在实体类中需要加入children的列表(类型是自己本身)

需要加入商品列表的属性

实体类代码

public class YxJpProductCategory extends BaseEntity {

private static final long serialVersionUID=1L;

private String id;

@ApiModelProperty(value = "上级分类的编号：0表示一级分类")

private String parentId;

@ApiModelProperty(value = "所有父级编号")

private String parentIds;

@ApiModelProperty(value = "分类名称")

private String name;

@ApiModelProperty(value = "分类级别：0->1级；1->2级")

private String level;

@ApiModelProperty(value = "产品数量")

private Integer productCount;

@ApiModelProperty(value = "排序")

private Integer sort;

@ApiModelProperty(value = "图标")

private String icon;

@ApiModelProperty(value = "关键词")

private String keywords;

@ApiModelProperty(value = "描述")

private String description;

@ApiModelProperty(value = "创建者",hidden = true)

private String createBy;

@ApiModelProperty(value = "创建时间",example = "2020-05-19 00:00:00",hidden = true)

private Date createDate;

@ApiModelProperty(value = "更新者",hidden = true)

private String updateBy;

@ApiModelProperty(value = "更新时间",example = "2020-05-19 00:00:00",hidden = true)

private Date updateDate;

private String remarks;

@TableLogic

@ApiModelProperty(value = "删除标记",example = "0",hidden = true)

private String delFlag;

private String openid;

@TableField(select = false,exist = false)

@ApiModelProperty(hidden = true)

private List children;

@TableField(select = false,exist = false)

@ApiModelProperty(hidden = true)

private IPage products;

@Override

protected Serializable pkVal() {

return this.id;

}

}

java 11官方入门(第8版)教材

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