字符串操作 - 逗号分割字符串转树形结构

    public static List<String> gene() {        List<String> originList = new ArrayList<>();        originList.add("序一");        originList.add("序二");        originList.add("卷一,目一");        originList.add("卷一,目二");        originList.add("卷一,目三");        originList.add("卷一,目四");        originList.add("卷一,目五");        originList.add("卷一,目五,子一");        originList.add("卷二,录一");        originList.add("卷二,录二");        originList.add("卷二,录三");        originList.add("卷二,录四");        originList.add("卷二,录五");        return originList;    }

[   {"id":"序一","name":"序一","parentId":"-1"},  {"id":"序二","name":"序二","parentId":"-1"},  {"id":"卷一","name":"卷一","parentId":"-1",      "children":[          {"id":"目一","name":"目一","parentId":"卷一"},          {"id":"目二","name":"目二","parentId":"卷一"},          {"id":"目三","name":"目三","parentId":"卷一"},          {"id":"目四","name":"目四","parentId":"卷一"},          {"id":"目五","name":"目五","parentId":"卷一",              "children":[                  {"id":"子一","name":"子一","parentId":"目五"}              ]          }      ]  },  {"id":"卷二","name":"卷二","parentId":"-1",      "children":[          {"id":"录一","name":"录一","parentId":"卷二"},          {"id":"录二","name":"录二","parentId":"卷二"},          {"id":"录三","name":"录三","parentId":"卷二"},          {"id":"录四","name":"录四","parentId":"卷二"},          {"id":"录五","name":"录五","parentId":"卷二"}      ]  }]