list列表转tree树方法（生成树型结构）

 基础类：

public class TreeNodeDto {
    private String id;
    private String parentId;
    /**
     * 节点名称
     */
    private String nodeName;
    private String nodeType;
    private String iconUrl;
    /**
     * 叶子节点业务id
     */
    private String businessId;
    /**
     * 节点排序号
     */
    private Integer treeSort = 0;
    private List<TreeNodeDto> childList;
}

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