flutter 根据参数的首字母进行排序重组

后面在请求加密中要用到,特此记录一下

1.工具类

 /// 根据request参数的key进行排序,并生成一个新的map返回
  static Map<String, String> keySort(Map<String, String> oldParamsMap) {
    Map<String, String> newParamsMap = Map();
    List<String> oldKeys = oldParamsMap.keys.toList();
    if (oldKeys.isEmpty) return newParamsMap;
    oldKeys.sort((a, b) {
      List<int> al = a.codeUnits;
      List<int> bl = b.codeUnits;
      for (int i = 0; i < al.length; i++) {
        if (bl.length <= i) return 1;
        if (al[i] > bl[i]) {
          return 1;
        } else if (al[i] < bl[i]) return -1;
      }
      return 0;
    });
    print(oldKeys);
    for (int i = 0; i < oldKeys.length; i++) {
      newParamsMap[oldKeys[i]] = oldParamsMap[oldKeys[i]];
    }
    return newParamsMap;
  }

2.测试

  void _paramsSort(){
    Map<String,String> params = Map();
    params["pageId"] = "1";
    params["pageSize"] = "10";
    params["sort"] = "1";
    params["goodsId"] = "053453";
    params["ablout"] = "测试";
    params["zoom"] = "145";
    params["boot"] = "spring";
    Map<String,String> newParams = Utils.keySort(params);
    print("排序后的map:${json.encode(newParams)}");
  }