添加七牛云文件上传

lib/util/net_util.dart

@@ -357,6 +357,28 @@ class NetUtil {
     return EncodeUtil.generateMd5(path + map.toString());
   }
 
+  // 七牛云文件上传
+  static Future uploadFile(String url, File file,
+      {String method = 'POST',
+      Map<String, dynamic> params,
+      OnSuccess onSuccess,
+      OnError onError}) async {
+    if (params == null) {
+      params = {};
+    }
+    Dio dio = Dio(BaseOptions(
+      method: "post",
+      connectTimeout: 15000,
+      receiveTimeout: 15000,
+      contentType: Headers.jsonContentType,
+      followRedirects: true,
+    ));
+
+    params['file'] = await MultipartFile.fromFile(file.path);
+    FormData format = FormData.fromMap(params);
+    return dio.request(url, data: format, options: Options(method: method));
+  }
+
   /// 签名
   static String signWithArray(List<String> params) {
     // 字母升序