/**
* 递归查询本节点的id及孩子节点的id
* @param categoryId
* @return
*/
public ServerResponse<List<Integer>> selectCategoryAndChildrenById(Integer categoryId){
Set<Category> categorySet = Sets.newHashSet();
findChildCategory(categorySet,categoryId);
List<Integer> categoryIdList = Lists.newArrayList();
if(categoryId != null){
for(Category categoryItem : categorySet){
categoryIdList.add(categoryItem.getId());
}
}
return ServerResponse.createBySuccess(categoryIdList);
}
//递归算法,算出子节点
private Set<Category> findChildCategory(Set<Category> categorySet ,Integer categoryId){
Category category = categoryMapper.selectByPrimaryKey(categoryId);
if(category != null){
categorySet.add(category);
}
//查找子节点,递归算法一定要有一个退出的条件
List<Category> categoryList = categoryMapper.selectCategoryChildrenByParentId(categoryId);
for(Category categoryItem : categoryList){
findChildCategory(categorySet,categoryItem.getId());
}
return categorySet;
}
JavaWeb - 查询任意节点的所有子节点(包括孙子节点)
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转载自blog.csdn.net/Dream_Weave/article/details/105151640
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