java递归生成树结构的数据

@Data
@EqualsAndHashCode(callSuper =true)
@ApiModel(value = "AccountCaptionVo", description = "会计科目")
public class AccountCaptionVo extends BaseModel {

    @ApiModelProperty(value ="会计科目名称",name = "captionName")
    private String captionName;

    @ApiModelProperty(value = "会计科目编码",name = "captionCode")
    private String  captionCode;

    @ApiModelProperty(value = "父类编码",name = "parentId")
    private Long  parentId;

    @ApiModelProperty(value = "系统科目",name = "systematicSubjects")
    private String  systematicSubjects;

    @ApiModelProperty(value = "借贷方向",name = "lendingDirection")
    private String  lendingDirection;

    @ApiModelProperty(value = "子集",name = "children")
    private List<AccountCaptionVo> children;

    @ApiModelProperty(value = "科目名称助记码",name = "mnemonicCode")
    private String  mnemonicCode;




public static List<AccountCaptionVo> listToTree(List<AccountCaptionVo> list) {
    //用递归找子。
    List<AccountCaptionVo> treeList = new ArrayList<AccountCaptionVo>();
    for (AccountCaptionVo tree : list) {
   //根目录的parentId为-1
        if (tree.getParentId() == -1 ) {
            treeList.add(findChildren(tree, list));
        }
    }
    return treeList;
}

private static AccountCaptionVo findChildren(AccountCaptionVo tree, List<AccountCaptionVo> list) {
    for (AccountCaptionVo node : list) {
        if (node.getParentId().longValue() == tree.getId().longValue()) {
            if (tree.getChildren() == null) {
                tree.setChildren(new ArrayList<AccountCaptionVo>());
            }
            tree.getChildren().add(findChildren(node, list));
        }
    }
    return tree;
}

@GetMapping(path="")
@ApiOperation(value="获取所有会计科目",nickname="getAccountCaption")
public Iterable<AccountCaptionVo> List(){
    List<AccountCaption>  listAccountCaption=  capAccountRepository.selecttSql();
    List<AccountCaptionVo> listAccountCaptionVos=new ArrayList<>();
    listAccountCaption.stream().forEach(x->
    {
        AccountCaptionVo AccountCaptionVo=new AccountCaptionVo();
        try {
            BeanUtils.copyProperties(AccountCaptionVo,x);
            listAccountCaptionVos.add(AccountCaptionVo);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
    });
    return  listToTree(listAccountCaptionVos);
}

来源：oschina

链接：https://my.oschina.net/u/4397001/blog/3421528

标签

java

BeanUtils