Flutter 網路請求 Dio 封裝

小林rush發表於2021-09-01

  在Flutter專案中使用網路請求的方式大致可分為兩種,分別是Dart原生的網路請求 HttpClient類以及第三方開源的網路請求庫。在Dart社群開源的第三方http請求庫中Flutter中文網開源的Dio庫人氣最高。
  下面我們先來比較下這兩種網路請求方式,然後再看怎麼基於 Dio庫封裝方便使用的網路請求工具類HttpManager。

網路請求庫比較

HttClient類

Dart IO庫中提供了用於發起Http請求的一些類,我們可以直接使用HttpClient來發起請求。使用HttpClient發起請求分為五步:

  1. 建立一個HttpClient
 HttpClient httpClient = new HttpClient();
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  1. 開啟Http連線,設定請求頭
HttpClientRequest request = await httpClient.getUrl(uri);
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這一步可以使用任意Http Method,如httpClient.post(...)、httpClient.delete(...)等。如果包含Query引數,可以在構建uri時新增,如:

Uri uri=Uri(scheme: "https", host: "flutterchina.club", queryParameters: {
    "xx":"xx",
    "yy":"dd"
  });
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通過HttpClientRequest可以設定請求header,如:

request.headers.add("user-agent", "test");
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如果是post或put等可以攜帶請求體方法,可以通過HttpClientRequest物件傳送request body,如:

String payload="...";
request.add(utf8.encode(payload)); 
//request.addStream(_inputStream); //可以直接新增輸入流
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  1. 等待連線伺服器
HttpClientResponse response = await request.close();
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這一步完成後,請求資訊就已經傳送給伺服器了,返回一個HttpClientResponse物件,它包含響應頭(header)和響應流(響應體的Stream),接下來就可以通過讀取響應流來獲取響應內容。

  1. 讀取響應內容
String responseBody = await response.transform(utf8.decoder).join();
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我們通過讀取響應流來獲取伺服器返回的資料,在讀取時我們可以設定編碼格式,這裡是utf8。

  1. 請求結束,關閉HttpClient
httpClient.close();
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關閉client後,通過該client發起的所有請求都會中止。

  以上的步驟是dart原生網路HttpClient使用方式,可以發現直接使用HttpClient發起網路請求是比較麻煩的,很多事情都得手動處理,如果再涉及到檔案上傳/下載、Cookie管理等就會變得非常繁瑣,並且HttpClient本身功能較弱,很多常用功能都不支援。

Dio庫

dio是一個強大的Dart Http請求庫,支援Restful API、FormData、攔截器、請求取消、Cookie管理、檔案上傳/下載、超時等...

  1. pubspec.yaml 新增依賴
dependencies:
  dio: ^x.x.x #請使用pub上的最新版本
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  1. 匯入引用並建立dio 例項
import 'package:dio/dio.dart';
Dio dio =  Dio();
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接下來就可以通過 dio例項來發起網路請求了,注意,一個dio例項可以發起多個http請求,一般來說,APP只有一個http資料來源時,dio應該使用單例模式。

  1. 發起網路請求

Get 請求

Response response;
response=await dio.get("/test?id=12&name=cheney")
print(response.data.toString());
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Post請求

Response response;
response=await dio.post("/test",data:{"id":12,"name":"cheney"})
print(response.data.toString());
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  以上就是Dio庫網路請求的基本使用,是不是很簡單,除了這些基本的用法,dio還支援請求配置、攔截器等,官方資料比較詳細,故在這裡不再贅述,詳情可以參考dio主頁:github.com/flutterchin…

封裝Dio工具類

為什麼要封裝 dio

做一些公共處理,方便靈活的使用。

做那些封裝

  • 統一處理請求字首;(www.xx.com/api/v1 不用每個請求都加字首)
  • 統一輸出請求或響應資訊;
  • 統一錯誤資訊處理;
  • 相容多種網路請求、支援檔案上傳、下載;
  • 支援同步回撥與非同步Future 兩種形式
  • 返回資料自動轉json格式並預設解析公共資料模型;

目錄

類名 描述
HttpManager 網路請求管理類
HttpError 網路請求統一錯誤類
LogInterceptor 網路請求工具類

HttpManager

import 'dart:core';

import 'package:connectivity/connectivity.dart';
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter_common_utils/http/http_error.dart';
import 'package:flutter_common_utils/log_util.dart';

///http請求成功回撥
typedef HttpSuccessCallback<T> = void Function(dynamic data);

///失敗回撥
typedef HttpFailureCallback = void Function(HttpError data);

///資料解析回撥
typedef T JsonParse<T>(dynamic data);


/// @desc  封裝 http 請求
/// @time 2019/3/15 10:35 AM
/// @author Cheney
class HttpManager {
  ///同一個CancelToken可以用於多個請求,當一個CancelToken取消時,所有使用該CancelToken的請求都會被取消,一個頁面對應一個CancelToken。
  Map<String, CancelToken> _cancelTokens =  Map<String, CancelToken>();

  ///超時時間
  static const int CONNECT_TIMEOUT = 30000;
  static const int RECEIVE_TIMEOUT = 30000;

  /// http request methods
  static const String GET = 'get';
  static const String POST = 'post';

  Dio _client;

  static final HttpManager _instance = HttpManager._internal();

  factory HttpManager() => _instance;

  Dio get client => _client;

  /// 建立 dio 例項物件
  HttpManager._internal() {
    if (_client == null) {
      /// 全域性屬性:請求字首、連線超時時間、響應超時時間
      BaseOptions options = BaseOptions(
        connectTimeout: CONNECT_TIMEOUT,
        receiveTimeout: RECEIVE_TIMEOUT,
      );
      _client = Dio(options);
    }
  }

  ///初始化公共屬性
  ///
  /// [baseUrl] 地址字首
  /// [connectTimeout] 連線超時趕時間
  /// [receiveTimeout] 接收超時趕時間
  /// [interceptors] 基礎攔截器
  void init(
      {String baseUrl,
      int connectTimeout,
      int receiveTimeout,
      List<Interceptor> interceptors}) {
    _client.options = _client.options.merge(
      baseUrl: baseUrl,
      connectTimeout: connectTimeout,
      receiveTimeout: receiveTimeout,
    );
    if (interceptors != null && interceptors.isNotEmpty) {
      _client.interceptors..addAll(interceptors);
    }
  }

  ///Get網路請求
  ///
  ///[url] 網路請求地址不包含域名
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[successCallback] 請求成功回撥
  ///[errorCallback] 請求失敗回撥
  ///[tag] 請求統一標識,用於取消網路請求
  void get({
    @required String url,
    Map<String, dynamic> params,
    Options options,
    HttpSuccessCallback successCallback,
    HttpFailureCallback errorCallback,
    @required String tag,
  }) async {
    _request(
      url: url,
      params: params,
      method: GET,
      successCallback: successCallback,
      errorCallback: errorCallback,
      tag: tag,
    );
  }

  ///post網路請求
  ///
  ///[url] 網路請求地址不包含域名
  ///[data] post 請求引數
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[successCallback] 請求成功回撥
  ///[errorCallback] 請求失敗回撥
  ///[tag] 請求統一標識,用於取消網路請求
  void post({
    @required String url,
    data,
    Map<String, dynamic> params,
    Options options,
    HttpSuccessCallback successCallback,
    HttpFailureCallback errorCallback,
    @required String tag,
  }) async {
    _request(
      url: url,
      data: data,
      method: POST,
      params: params,
      successCallback: successCallback,
      errorCallback: errorCallback,
      tag: tag,
    );
  }

  ///統一網路請求
  ///
  ///[url] 網路請求地址不包含域名
  ///[data] post 請求引數
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[successCallback] 請求成功回撥
  ///[errorCallback] 請求失敗回撥
  ///[tag] 請求統一標識,用於取消網路請求
  void _request({
    @required String url,
    String method,
    data,
    Map<String, dynamic> params,
    Options options,
    HttpSuccessCallback successCallback,
    HttpFailureCallback errorCallback,
    @required String tag,
  }) async {
    //檢查網路是否連線
    ConnectivityResult connectivityResult =
        await (Connectivity().checkConnectivity());
    if (connectivityResult == ConnectivityResult.none) {
      if (errorCallback != null) {
        errorCallback(HttpError(HttpError.NETWORK_ERROR, "網路異常,請稍後重試!"));
      }
      LogUtil.v("請求網路異常,請稍後重試!");
      return;
    }

    //設定預設值
    params = params ?? {};
    method = method ?? 'GET';

    options?.method = method;

    options = options ??
        Options(
          method: method,
        );

    url = _restfulUrl(url, params);

    try {
      CancelToken cancelToken;
      if (tag != null) {
        cancelToken =
            _cancelTokens[tag] == null ? CancelToken() : _cancelTokens[tag];
        _cancelTokens[tag] = cancelToken;
      }

      Response<Map<String, dynamic>> response = await _client.request(url,
          data: data,
          queryParameters: params,
          options: options,
          cancelToken: cancelToken);
      String statusCode = response.data["statusCode"];
      if (statusCode == "0") {
        //成功
        if (successCallback != null) {
          successCallback(response.data["data"]);
        }
      } else {
        //失敗
        String message = response.data["statusDesc"];
        LogUtil.v("請求伺服器出錯:$message");
        if (errorCallback != null) {
          errorCallback(HttpError(statusCode, message));
        }
      }
    } on DioError catch (e, s) {
      LogUtil.v("請求出錯:$e\n$s");
      if (errorCallback != null && e.type != DioErrorType.CANCEL) {
        errorCallback(HttpError.dioError(e));
      }
    } catch (e, s) {
      LogUtil.v("未知異常出錯:$e\n$s");
      if (errorCallback != null) {
        errorCallback(HttpError(HttpError.UNKNOWN, "網路異常,請稍後重試!"));
      }
    }
  }

  ///下載檔案
  ///
  ///[url] 下載地址
  ///[savePath]  檔案儲存路徑
  ///[onReceiveProgress]  檔案儲存路徑
  ///[data] post 請求引數
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[successCallback] 請求成功回撥
  ///[errorCallback] 請求失敗回撥
  ///[tag] 請求統一標識,用於取消網路請求
  void download({
    @required String url,
    @required savePath,
    ProgressCallback onReceiveProgress,
    Map<String, dynamic> params,
    data,
    Options options,
    HttpSuccessCallback successCallback,
    HttpFailureCallback errorCallback,
    @required String tag,
  }) async {
    //檢查網路是否連線
    ConnectivityResult connectivityResult =
        await (Connectivity().checkConnectivity());
    if (connectivityResult == ConnectivityResult.none) {
      if (errorCallback != null) {
        errorCallback(HttpError(HttpError.NETWORK_ERROR, "網路異常,請稍後重試!"));
      }
      LogUtil.v("請求網路異常,請稍後重試!");
      return;
    }

    ////0代表不設定超時
    int receiveTimeout = 0;
    options ??= options == null
        ? Options(receiveTimeout: receiveTimeout)
        : options.merge(receiveTimeout: receiveTimeout);

    //設定預設值
    params = params ?? {};

    url = _restfulUrl(url, params);

    try {
      CancelToken cancelToken;
      if (tag != null) {
        cancelToken =
            _cancelTokens[tag] == null ? CancelToken() : _cancelTokens[tag];
        _cancelTokens[tag] = cancelToken;
      }

      Response response = await _client.download(url, savePath,
          onReceiveProgress: onReceiveProgress,
          queryParameters: params,
          data: data,
          options: options,
          cancelToken: cancelToken);
      //成功
      if (successCallback != null) {
        successCallback(response.data);
      }
    } on DioError catch (e, s) {
      LogUtil.v("請求出錯:$e\n$s");
      if (errorCallback != null && e.type != DioErrorType.CANCEL) {
        errorCallback(HttpError.dioError(e));
      }
    } catch (e, s) {
      LogUtil.v("未知異常出錯:$e\n$s");
      if (errorCallback != null) {
        errorCallback(HttpError(HttpError.UNKNOWN, "網路異常,請稍後重試!"));
      }
    }
  }

  ///上傳檔案
  ///
  ///[url] 網路請求地址不包含域名
  ///[data] post 請求引數
  ///[onSendProgress] 上傳進度
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[successCallback] 請求成功回撥
  ///[errorCallback] 請求失敗回撥
  ///[tag] 請求統一標識,用於取消網路請求
  void upload({
    @required String url,
    FormData data,
    ProgressCallback onSendProgress,
    Map<String, dynamic> params,
    Options options,
    HttpSuccessCallback successCallback,
    HttpFailureCallback errorCallback,
    @required String tag,
  }) async {
    //檢查網路是否連線
    ConnectivityResult connectivityResult =
        await (Connectivity().checkConnectivity());
    if (connectivityResult == ConnectivityResult.none) {
      if (errorCallback != null) {
        errorCallback(HttpError(HttpError.NETWORK_ERROR, "網路異常,請稍後重試!"));
      }
      LogUtil.v("請求網路異常,請稍後重試!");
      return;
    }

    //設定預設值
    params = params ?? {};

    //強制 POST 請求
    options?.method = POST;

    options = options ??
        Options(
          method: POST,
        );

    url = _restfulUrl(url, params);

    try {
      CancelToken cancelToken;
      if (tag != null) {
        cancelToken =
            _cancelTokens[tag] == null ? CancelToken() : _cancelTokens[tag];
        _cancelTokens[tag] = cancelToken;
      }

      Response<Map<String, dynamic>> response = await _client.request(url,
          onSendProgress: onSendProgress,
          data: data,
          queryParameters: params,
          options: options,
          cancelToken: cancelToken);
      String statusCode = response.data["statusCode"];
      if (statusCode == "0") {
        //成功
        if (successCallback != null) {
          successCallback(response.data["data"]);
        }
      } else {
        //失敗
        String message = response.data["statusDesc"];
        LogUtil.v("請求伺服器出錯:$message");
        if (errorCallback != null) {
          errorCallback(HttpError(statusCode, message));
        }
      }
    } on DioError catch (e, s) {
      LogUtil.v("請求出錯:$e\n$s");
      if (errorCallback != null && e.type != DioErrorType.CANCEL) {
        errorCallback(HttpError.dioError(e));
      }
    } catch (e, s) {
      LogUtil.v("未知異常出錯:$e\n$s");
      if (errorCallback != null) {
        errorCallback(HttpError(HttpError.UNKNOWN, "網路異常,請稍後重試!"));
      }
    }
  }

  ///GET非同步網路請求
  ///
  ///[url] 網路請求地址不包含域名
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[tag] 請求統一標識,用於取消網路請求
  Future<T> getAsync<T>({
    @required String url,
    Map<String, dynamic> params,
    Options options,
    JsonParse<T> jsonParse,
    @required String tag,
  }) async {
    return _requestAsync(
      url: url,
      method: GET,
      params: params,
      options: options,
      jsonParse: jsonParse,
      tag: tag,
    );
  }

  ///POST 非同步網路請求
  ///
  ///[url] 網路請求地址不包含域名
  ///[data] post 請求引數
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[tag] 請求統一標識,用於取消網路請求
  Future<T> postAsync<T>({
    @required String url,
    data,
    Map<String, dynamic> params,
    Options options,
    JsonParse<T> jsonParse,
    @required String tag,
  }) async {
    return _requestAsync(
      url: url,
      method: POST,
      data: data,
      params: params,
      options: options,
      jsonParse: jsonParse,
      tag: tag,
    );
  }

  ///統一網路請求
  ///
  ///[url] 網路請求地址不包含域名
  ///[data] post 請求引數
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[tag] 請求統一標識,用於取消網路請求
  Future<T> _requestAsync<T>({
    @required String url,
    String method,
    data,
    Map<String, dynamic> params,
    Options options,
    JsonParse<T> jsonParse,
    @required String tag,
  }) async {
    //檢查網路是否連線
    ConnectivityResult connectivityResult =
        await (Connectivity().checkConnectivity());
    if (connectivityResult == ConnectivityResult.none) {
      LogUtil.v("請求網路異常,請稍後重試!");
      throw (HttpError(HttpError.NETWORK_ERROR, "網路異常,請稍後重試!"));
    }

    //設定預設值
    params = params ?? {};
    method = method ?? 'GET';

    options?.method = method;

    options = options ??
        Options(
          method: method,
        );

    url = _restfulUrl(url, params);

    try {
      CancelToken cancelToken;
      if (tag != null) {
        cancelToken =
            _cancelTokens[tag] == null ? CancelToken() : _cancelTokens[tag];
        _cancelTokens[tag] = cancelToken;
      }

      Response<Map<String, dynamic>> response = await _client.request(url,
          queryParameters: params,
          data: data,
          options: options,
          cancelToken: cancelToken);
      String statusCode = response.data["statusCode"];
      if (statusCode == "0") {
        //成功
        if (jsonParse != null) {
          return jsonParse(response.data["data"]);
        } else {
          return response.data["data"];
        }
      } else {
        //失敗
        String message = response.data["statusDesc"];
        LogUtil.v("請求伺服器出錯:$message");
        //只能用 Future,外層有 try catch
        return Future.error((HttpError(statusCode, message)));
      }
    } on DioError catch (e, s) {
      LogUtil.v("請求出錯:$e\n$s");
      throw (HttpError.dioError(e));
    } catch (e, s) {
      LogUtil.v("未知異常出錯:$e\n$s");
      throw (HttpError(HttpError.UNKNOWN, "網路異常,請稍後重試!"));
    }
  }

  ///非同步下載檔案
  ///
  ///[url] 下載地址
  ///[savePath]  檔案儲存路徑
  ///[onReceiveProgress]  檔案儲存路徑
  ///[data] post 請求引數
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[tag] 請求統一標識,用於取消網路請求
  Future<Response> downloadAsync({
    @required String url,
    @required savePath,
    ProgressCallback onReceiveProgress,
    Map<String, dynamic> params,
    data,
    Options options,
    @required String tag,
  }) async {
    //檢查網路是否連線
    ConnectivityResult connectivityResult =
        await (Connectivity().checkConnectivity());
    if (connectivityResult == ConnectivityResult.none) {
      LogUtil.v("請求網路異常,請稍後重試!");
      throw (HttpError(HttpError.NETWORK_ERROR, "網路異常,請稍後重試!"));
    }
    //設定下載不超時
    int receiveTimeout = 0;
    options ??= options == null
        ? Options(receiveTimeout: receiveTimeout)
        : options.merge(receiveTimeout: receiveTimeout);

    //設定預設值
    params = params ?? {};

    url = _restfulUrl(url, params);

    try {
      CancelToken cancelToken;
      if (tag != null) {
        cancelToken =
            _cancelTokens[tag] == null ? CancelToken() : _cancelTokens[tag];
        _cancelTokens[tag] = cancelToken;
      }

      return _client.download(url, savePath,
          onReceiveProgress: onReceiveProgress,
          queryParameters: params,
          data: data,
          options: options,
          cancelToken: cancelToken);
    } on DioError catch (e, s) {
      LogUtil.v("請求出錯:$e\n$s");
      throw (HttpError.dioError(e));
    } catch (e, s) {
      LogUtil.v("未知異常出錯:$e\n$s");
      throw (HttpError(HttpError.UNKNOWN, "網路異常,請稍後重試!"));
    }
  }

  ///上傳檔案
  ///
  ///[url] 網路請求地址不包含域名
  ///[data] post 請求引數
  ///[onSendProgress] 上傳進度
  ///[params] url請求引數支援restful
  ///[options] 請求配置
  ///[tag] 請求統一標識,用於取消網路請求
  Future<T> uploadAsync<T>({
    @required String url,
    FormData data,
    ProgressCallback onSendProgress,
    Map<String, dynamic> params,
    Options options,
    JsonParse<T> jsonParse,
    @required String tag,
  }) async {
    //檢查網路是否連線
    ConnectivityResult connectivityResult =
        await (Connectivity().checkConnectivity());
    if (connectivityResult == ConnectivityResult.none) {
      LogUtil.v("請求網路異常,請稍後重試!");
      throw (HttpError(HttpError.NETWORK_ERROR, "網路異常,請稍後重試!"));
    }

    //設定預設值
    params = params ?? {};

    //強制 POST 請求
    options?.method = POST;

    options = options ??
        Options(
          method: POST,
        );

    url = _restfulUrl(url, params);

    try {
      CancelToken cancelToken;
      if (tag != null) {
        cancelToken =
            _cancelTokens[tag] == null ? CancelToken() : _cancelTokens[tag];
        _cancelTokens[tag] = cancelToken;
      }

      Response<Map<String, dynamic>> response = await _client.request(url,
          onSendProgress: onSendProgress,
          data: data,
          queryParameters: params,
          options: options,
          cancelToken: cancelToken);

      String statusCode = response.data["statusCode"];
      if (statusCode == "0") {
        //成功
        if (jsonParse != null) {
          return jsonParse(response.data["data"]);
        } else {
          return response.data["data"];
        }
      } else {
        //失敗
        String message = response.data["statusDesc"];
        LogUtil.v("請求伺服器出錯:$message");
        return Future.error((HttpError(statusCode, message)));
      }
    } on DioError catch (e, s) {
      LogUtil.v("請求出錯:$e\n$s");
      throw (HttpError.dioError(e));
    } catch (e, s) {
      LogUtil.v("未知異常出錯:$e\n$s");
      throw (HttpError(HttpError.UNKNOWN, "網路異常,請稍後重試!"));
    }
  }

  ///取消網路請求
  void cancel(String tag) {
    if (_cancelTokens.containsKey(tag)) {
      if (!_cancelTokens[tag].isCancelled) {
        _cancelTokens[tag].cancel();
      }
      _cancelTokens.remove(tag);
    }
  }

  ///restful處理
  String _restfulUrl(String url, Map<String, dynamic> params) {
    // restful 請求處理
    // /gysw/search/hist/:user_id        user_id=27
    // 最終生成 url 為     /gysw/search/hist/27
    params.forEach((key, value) {
      if (url.indexOf(key) != -1) {
        url = url.replaceAll(':$key', value.toString());
      }
    });
    return url;
  }
}

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這裡內建了網路是否連線判斷、取消網路請求、處理了預設的資料格式為

{
	"data":{},
	"statusCode":"0",
	"statusDesc":"02032008:使用者授信未通過",
	"timestamp":1569206576392
}
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大家可根據自己的需求自行更改成自己的資料格式處理

HttpError

import 'package:dio/dio.dart';

/// @desc  網路請求錯誤
/// @time 2019/3/20 10:02 AM
/// @author Cheney
class HttpError {
  ///HTTP 狀態碼
  static const int UNAUTHORIZED = 401;
  static const int FORBIDDEN = 403;
  static const int NOT_FOUND = 404;
  static const int REQUEST_TIMEOUT = 408;
  static const int INTERNAL_SERVER_ERROR = 500;
  static const int BAD_GATEWAY = 502;
  static const int SERVICE_UNAVAILABLE = 503;
  static const int GATEWAY_TIMEOUT = 504;

  ///未知錯誤
  static const String UNKNOWN = "UNKNOWN";

  ///解析錯誤
  static const String PARSE_ERROR = "PARSE_ERROR";

  ///網路錯誤
  static const String NETWORK_ERROR = "NETWORK_ERROR";

  ///協議錯誤
  static const String HTTP_ERROR = "HTTP_ERROR";

  ///證書錯誤
  static const String SSL_ERROR = "SSL_ERROR";

  ///連線超時
  static const String CONNECT_TIMEOUT = "CONNECT_TIMEOUT";

  ///響應超時
  static const String RECEIVE_TIMEOUT = "RECEIVE_TIMEOUT";

  ///傳送超時
  static const String SEND_TIMEOUT = "SEND_TIMEOUT";

  ///網路請求取消
  static const String CANCEL = "CANCEL";

  String code;

  String message;

  HttpError(this.code, this.message);

  HttpError.dioError(DioError error) {
    message = error.message;
    switch (error.type) {
      case DioErrorType.CONNECT_TIMEOUT:
        code = CONNECT_TIMEOUT;
        message = "網路連線超時,請檢查網路設定";
        break;
      case DioErrorType.RECEIVE_TIMEOUT:
        code = RECEIVE_TIMEOUT;
        message = "伺服器異常,請稍後重試!";
        break;
      case DioErrorType.SEND_TIMEOUT:
        code = SEND_TIMEOUT;
        message = "網路連線超時,請檢查網路設定";
        break;
      case DioErrorType.RESPONSE:
        code = HTTP_ERROR;
        message = "伺服器異常,請稍後重試!";
        break;
      case DioErrorType.CANCEL:
        code = CANCEL;
        message = "請求已被取消,請重新請求";
        break;
      case DioErrorType.DEFAULT:
        code = UNKNOWN;
        message = "網路異常,請稍後重試!";
        break;
    }
  }

  @override
  String toString() {
    return 'HttpError{code: $code, message: $message}';
  }
}

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這裡設定的多種錯誤的描述,大家可根據需求自行修改

LogInterceptor

import 'package:dio/dio.dart';
import 'package:flutter_common_utils/log_util.dart';

void log2Console(Object object) {
  LogUtil.v(object);
}

/// @desc  自定義日誌攔截器
///@time 2019/3/18 9:15 AM
/// @author Cheney
class LogInterceptor extends Interceptor {
  LogInterceptor({
    this.request = true,
    this.requestHeader = true,
    this.requestBody = false,
    this.responseHeader = true,
    this.responseBody = false,
    this.error = true,
    this.logPrint = log2Console,
  });

  /// Print request [Options]
  bool request;

  /// Print request header [Options.headers]
  bool requestHeader;

  /// Print request data [Options.data]
  bool requestBody;

  /// Print [Response.data]
  bool responseBody;

  /// Print [Response.headers]
  bool responseHeader;

  /// Print error message
  bool error;

  /// Log printer; defaults print log to console.
  /// In flutter, you'd better use debugPrint.
  /// you can also write log in a file, for example:
  ///```dart
  ///  var file=File("./log.txt");
  ///  var sink=file.openWrite();
  ///  dio.interceptors.add(LogInterceptor(logPrint: sink.writeln));
  ///  ...
  ///  await sink.close();
  ///```
  void Function(Object object) logPrint;

  @override
  Future onRequest(RequestOptions options) async {
    logPrint('*** Request ***');
    printKV('uri', options.uri);

    if (request) {
      printKV('method', options.method);
      printKV('responseType', options.responseType?.toString());
      printKV('followRedirects', options.followRedirects);
      printKV('connectTimeout', options.connectTimeout);
      printKV('receiveTimeout', options.receiveTimeout);
      printKV('extra', options.extra);
    }
    if (requestHeader) {
      logPrint('headers:');
      options.headers.forEach((key, v) => printKV(" $key", v));
    }
    if (requestBody) {
      logPrint("data:");
      printAll(options.data);
    }
    logPrint("");
  }

  @override
  Future onError(DioError err) async {
    if (error) {
      logPrint('*** DioError ***:');
      logPrint("uri: ${err.request.uri}");
      logPrint("$err");
      if (err.response != null) {
        _printResponse(err.response);
      }
      logPrint("");
    }
  }

  @override
  Future onResponse(Response response) async {
    logPrint("*** Response ***");
    _printResponse(response);
  }

  void _printResponse(Response response) {
    printKV('uri', response.request?.uri);
    if (responseHeader) {
      printKV('statusCode', response.statusCode);
      if (response.isRedirect == true) {
        printKV('redirect', response.realUri);
      }
      if (response.headers != null) {
        logPrint("headers:");
        response.headers.forEach((key, v) => printKV(" $key", v.join(",")));
      }
    }
    if (responseBody) {
      logPrint("Response Text:");
      printAll(response.toString());
    }
    logPrint("");
  }

  printKV(String key, Object v) {
    logPrint('$key: $v');
  }

  printAll(msg) {
    msg.toString().split("\n").forEach(logPrint);
  }
}

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這裡預設使用 LogUtl 輸出日誌,大家可根據需要換成自己的日誌輸出工具類

使用示例

Flutter 網路請求 Dio 封裝

Step1: 初始化

//初始化 Http,
  HttpManager().init(
    baseUrl: Api.getBaseUrl(),
    interceptors: [
      HeaderInterceptor(),
      LogInterceptor(),
    ],
  );
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Step2:建立網路請求

///同步回撥模式
///get 網路請求
void _get(){
   HttpManager().get(
      url: "/app/info",
      params: {"iouCode": iouCode},
      successCallback: (data) {
        
      },
      errorCallback: (HttpError error) {
       
      },
      tag: "tag",
    );
}
///post 網路請求
void _post(){
     HttpManager().post(
      url: "/app/info",
      data: {"iouCode": iouCode},
      successCallback: (data) {
        
      },
      errorCallback: (HttpError error) {
        
      },
      tag: "tag",
    );
}

///下載檔案
void _download(){
     HttpManager().download(
      url: "/app/download",
      savePath: "/savePath",
      onReceiveProgress: (int count, int total) {
      },
      successCallback: (data) {
        
      },
      errorCallback: (HttpError error) {
        
      },
      tag: tag,
    );
}

///上傳檔案
void _upload() async{
FormData data = FormData.fromMap({
        "file": await MultipartFile.fromFile(path, filename: "$photoTime"),
      });
    HttpManager().upload(
        url: "/app/upload",
        data: data,
        tag: "tag",
        successCallback: (data) {
          
        },
        errorCallback: (HttpError error) {
          
        },
      );
}


///非同步模式
///get 請求
void _getAysnc() async{
     String timestamp =
        await HttpManager().getAsync(url: "/app/info", tag: "syncTime");
}

///post 請求
void _postAysnc() async{
   await HttpManager().postAsync(
        url: "app/info",
        tag: "tag",
        data: {
          'bannerTypes': ["wealthBanner"],
        },
        jsonParse: (json) => Pager(json, (data) => ImageAd(data)))
}

///下載檔案
void _downloadAsync() async{
    await HttpManager().downloadAsync(
      url: "/app/download",
      savePath: "/savePath",
      onReceiveProgress: (int count, int total) {
      },
      tag: "tag",
    );
}

///上傳檔案
void _uploadAsync() async{
FormData data = FormData.fromMap({
        "file": await MultipartFile.fromFile(path, filename: "$photoTime"),
      });
  await  HttpManager().uploadAsync(
        url: "/app/upload",
        data: data,
        tag: "tag",
       
      );
}
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最後

  如果在使用過程遇到問題,歡迎下方留言交流。

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