之前因为使用正常文件上传,用户多时拥堵无法正常上传,因此接入阿里OSS 来解决这个问题。本来打算整原生那块,看了下比较麻烦,用flutter dio 直接请求oss 完成
1.上传用到了image_picker 插件。这个比较简单了。
//要上传的文件,此处为从相册选择照片 File imageFile = await ImagePicker.pickImage(source: ImageSource.gallery);
2.阿里oss 配置以及相关处理String accesskey = '后台返回的AccessKeySecret'; 这个比较重要要用secret print(accesskey); //验证文本域
String policyText = '{"expiration": "2020-01-01T12:00:00.000Z","conditions": [["content-length-range", 0, 1048576000]]}'; //进行utf8编码 List<int> policyText_utf8 = utf8.encode(policyText); //进行base64编码 String policy_base64 = base64.encode(policyText_utf8); //再次进行utf8编码 List<int> policy = utf8.encode(policy_base64); //进行utf8 编码 List<int> key = utf8.encode(accesskey); //通过hmac,使用sha1进行加密 List<int> signature_pre = new Hmac(sha1, key).convert(policy).bytes; //最后一步,将上述所得进行base64 编码 String signature = base64.encode(signature_pre); //dio的请求配置,这一步非常重要! BaseOptions options = new BaseOptions(); options.responseType = ResponseType.plain; 这个后台返回值dio 默认json 要设置为普通文本 //创建dio对象 Dio dio = new Dio(options); //文件名 String fileName = _image.path .substring(_image.path.lastIndexOf("/") + 1, _image.path.length); // 生成uuid String uuid1 = uuid.v1(); //创建一个formdata,作为dio的参数 FormData data = new FormData.from({ 'Filename': 'img', 'key': 'images/work/${uuid1}/img.' + fileName.split('.')[1], //设置阿里oss 路径 不写就是默认根目录 'policy': policy_base64, 'OSSAccessKeyId': 'OSSAccessKeyId',
'success_action_status': '200', //让服务端返回200,不然,默认会返回204
'signature': signature,
'file': new UploadFileInfo(new File(_image.path), "imageFileName")
}); // print(_image.path); //
Response response; // Dio dio = new Dio(); // dio.options.baseUrl = DioUtil.API_PREFIX;
var loginData = SpUtil.getObject('loginData'); if (loginData != null) { var token = '${loginData['token_type']} ${loginData['access_token']}';
dio.options.headers['Authorization'] = token; } //设置token
if (Platform.isAndroid) { dio.options.headers['Client-Type'] = 'android'; } else { dio.options.headers['Client-Type'] = 'ios'; }
dio.options.headers['Accept'] = 'application/json'; dio.options.headers['Content-Type'] = 'application/json'; print(dio.options.headers);
setState(() { showPro = true; });
try {
response = await dio .post('http://lncc-public.oss-accelerate.aliyuncs.com', data: data,
onSendProgress: (int sent, int total) { //进度设置
print("上传进度=======$sent $total");
if (sent == total) { print('百分之百');
setState(() { showPro = false; Progress = 100; });
var obj = {'id': 'temp', 'work_url': _image.path};
uploadFileInfo.add(obj);
audioCache.play('collect/upload_01/00001.mp3', volume: 0.5);
setState(() { ifshow = 1.0;
//动画以及声音设置
});
FlutterTimer.startTimerChanged(
duration: _assetList.length, period: periodMilli, fromEnd: false, counting: _animing, end: null);
Future.delayed(Duration(seconds: 4), () {
print('三秒后关闭');
FlutterTimer(context).release();
setState(() {
ifshow = 0; Progress = 0;
});
});
} else {
setState(() {
Progress = int.parse(((sent / total) * 100).toStringAsFixed(0)); print(Progress); }); }
});
var result = response.statusCode;
if(result==200){
print(result);
var upurl = 'https://public-statics.lnart.com/images/work/${uuid1}/img.'+ fileName.split('.')[1]; print(upurl); //将上传oss的路径上传到自己的服务器
setState(() { showPro = false; });
}
} on DioError catch (e) {
print(e.message);
print(e.response.data);
print(e.response.headers);
print(e.response.request);
}