Tree数据从后台处理类

public class TreeUtils {
    /**
     * 使用递归方法建树
     * @param treeNodes
     * @return
     */
    public static List<ProjectBasicInfoDTO> buildByRecursive(List<ProjectBasicInfoDTO> projectBasicInfoDTOs) {
        List<ProjectBasicInfoDTO> trees = new ArrayList<ProjectBasicInfoDTO>();
        for (ProjectBasicInfoDTO projectBasicInfoDTO : projectBasicInfoDTOs) {
            if ("".equals(projectBasicInfoDTO.getpId()) || projectBasicInfoDTO.getpId() == null ) {
                trees.add(findChildren(projectBasicInfoDTO,projectBasicInfoDTOs));
            }
        }
        return trees;
    }
    
    /**
    * 递归查找子节点
    * @param treeNodes
    * @return
    */
    public static ProjectBasicInfoDTO findChildren(ProjectBasicInfoDTO projectBasicInfoDTO,List<ProjectBasicInfoDTO> projectBasicInfoDTOs) {
        for (ProjectBasicInfoDTO projectBasicInfoDTO2 : projectBasicInfoDTOs) {
            if(projectBasicInfoDTO.getId().equals(projectBasicInfoDTO2.getpId())) {
                if(projectBasicInfoDTO.getChildren() == null) {
                    projectBasicInfoDTO.setChildren(new ArrayList<ProjectBasicInfoDTO>());
                }
                //是否还有子节点，如果有的话继续往下遍历，如果没有则直接返回
                projectBasicInfoDTO.getChildren().add(findChildren(projectBasicInfoDTO2,projectBasicInfoDTOs));
            }
        }
        return projectBasicInfoDTO;
    }
}