send<T> static method

Future<T> send<T>(String method, String host, String path, [ Map<String, dynamic>? data, ])

Implementation

static Future<T> send<T> (final String method, final String host, final String path, [
  final Map<String, dynamic>? data,
]) async {
  /// http请求对象
  final request = await HttpClient().openUrl(method, Uri.http(host, path));
  /// 设置http协议类型为form-data，并设置字段分隔符boundary
  if (method != 'get' && data != null) {
    final boundary = 'abcdefghijklmnopqrstuvwxyz';
    request.headers.contentType = ContentType('multipart', 'form-data', parameters: {
      'boundary': boundary,
    });
    /// 分别将字段写入http报文
    for (final key in data.keys) {
      final value = data[key];
      if (value is File) {
        /// 写入文件字段
        request.write('\n--$boundary\n');
        request.write('Content-Disposition: form-data; name=$key; filename=${value.path}\n\n');
        request.write('${String.fromCharCodes(value.readAsBytesSync())}\n');
      } else {
        /// 写入其他字段
        request.write('\n--$boundary\n');
        request.write('Content-Disposition: form-data; name=$key\n\n');
        request.write('$value\n');
      }
    }
    /// 写入http报文结尾
    request.write('--$boundary--');
  }
  /// 获取服务器响应
  final response = await request.close();
  /// 转为utf8编码的json字符串
  final json = await response.transform(Utf8Decoder()).join();
  /// 转为指定类型
  final res = jsonDecode(json) as T;
  /// 返回
  return res;
}