Java

获取文件夹指定类型的文件

private File[] getFilterFiles(String path, String[] suffix) {

    File baseFolder = new File(path);
    if(!baseFolder.isDirectory())return null;

    FileFilter imageFilter = pathname -> {
        String fileName = pathname.getName().toLowerCase();
        for (String s : suffix) {
            if (fileName.endsWith(s.toLowerCase())) return true;
        }
        return false;
    };

    return baseFolder.listFiles(imageFilter);
}

二维表转树Json

class itemType;
class itemTypeTree extetends itemType{
    List<itemTypeTree> children;
}

private List<ItemTypeTree> recursionNode(List<ItemType> list, ItemType itemTree) {

    if(list==null)return null;
    if(itemTree==null)itemTree=new ItemTypeTree();
    return  getChildNode(list,itemTree).stream()
            .map(item -> {
                if(getChildNode(list,item).size()>0){
                    item.setChildren(recursionNode(list,item));
                }
               return  item;
            })
            .collect(Collectors.toList());
}
private List<ItemTypeTree> getChildNode(List<ItemType> list,ItemType itemTree){
    return list.stream()
            .filter(item -> {
                if(StringUtils.isBlank(itemTree.getTypecode())){
                    return StringUtils.isBlank(item.getParentcode());
                }else {
                    return item.getParentcode().equals(itemTree.getTypecode());
                }
            })
            .map(itemType -> {
                ItemTypeTree itemTypeTree=new ItemTypeTree();
                BeanUtils.copyProperties(itemType,itemTypeTree);
                return itemTypeTree;
            })
            .collect(Collectors.toList());
}