从网上找到了一个flutter dart请求类,但post部分有错误,已经做了修改,现贴出来
import 'package:cookie_jar/cookie_jar.dart';
import 'package:dio/dio.dart';
import 'package:dio_cookie_manager/dio_cookie_manager.dart';
import 'package:blue_collar_age_class/utils/config.dart';
class HttpUtil {
static HttpUtil? instance;
Dio? dio;
BaseOptions? options;
CancelToken cancelToken = CancelToken();
static HttpUtil? getInstance() {
if (null == instance) instance = HttpUtil();
return instance;
}
/*
* config it and create
*/
HttpUtil() {
//BaseOptions、Options、RequestOptions 都可以配置参数,优先级别依次递增,且可以根据优先级别覆盖参数
options = BaseOptions(
//请求基地址,可以包含子路径
baseUrl: Config.URL_BASE,
//连接服务器超时时间,单位是毫秒.
connectTimeout: 10000,
//响应流上前后两次接受到数据的间隔,单位为毫秒。
receiveTimeout: 5000,
//Http请求头.
headers: {
//do something
"version": "1.0.0"
},
//请求的Content-Type,默认值是"application/json; charset=utf-8",Headers.formUrlEncodedContentType会自动编码请求体.
contentType: Headers.formUrlEncodedContentType,
//表示期望以那种格式(方式)接受响应数据。接受四种类型 `json`, `stream`, `plain`, `bytes`. 默认值是 `json`,
responseType: ResponseType.plain,
);
dio = Dio(options);
//Cookie管理
dio!.interceptors.add(CookieManager(CookieJar()));
//添加拦截器
dio!.interceptors
.add(InterceptorsWrapper(onRequest: (RequestOptions options) {
print("请求之前");
// Do something before request is sent
return options; //continue
}, onResponse: (Response response) {
print("响应之前");
// Do something with response data
return response; // continue
}, onError: (DioError e) {
print("错误之前");
// Do something with response error
return e; //continue
}));
}
/*
* get请求
*/
get(url, {data, options, cancelToken}) async {
Response? response;
try {
response = await dio!.get(url,
queryParameters: data, options: options, cancelToken: cancelToken);
print('get success---------${response.statusCode}');
print('get success---------${response.data}');
// response.data; 响应体
// response.headers; 响应头
// response.request; 请求体
// response.statusCode; 状态码
} on DioError catch (e) {
print('get error---------$e');
formatError(e);
}
return response;
}
/*
* post请求
*/
post(url, {data, params, options, cancelToken}) async {
Response? response;
try {
response = await dio!.post(url, data:data, queryParameters: params, options: options, cancelToken: cancelToken);
print('post success---------${response.data}');
} on DioError catch (e) {
print('post error---------$e');
formatError(e);
}
return response;
}
/*
* 下载文件
*/
downloadFile(urlPath, savePath) async {
Response? response;
try {
response = await dio!.download(urlPath, savePath,
onReceiveProgress: (int count, int total) {
//进度
print("$count $total");
});
print('downloadFile success---------${response.data}');
} on DioError catch (e) {
print('downloadFile error---------$e');
formatError(e);
}
return response!.data;
}
/*
* error统一处理
*/
void formatError(DioError e) {
if (e.type == DioErrorType.CONNECT_TIMEOUT) {
// It occurs when url is opened timeout.
print("连接超时");
} else if (e.type == DioErrorType.SEND_TIMEOUT) {
// It occurs when url is sent timeout.
print("请求超时");
} else if (e.type == DioErrorType.RECEIVE_TIMEOUT) {
//It occurs when receiving timeout
print("响应超时");
} else if (e.type == DioErrorType.RESPONSE) {
// When the server response, but with a incorrect status, such as 404, 503...
print("出现异常");
} else if (e.type == DioErrorType.CANCEL) {
// When the request is cancelled, dio will throw a error with this type.
print("请求取消");
} else {
//DEFAULT Default error type, Some other Error. In this case, you can read the DioError.error if it is not null.
print("未知错误");
}
}
/*
* 取消请求
*
* 同一个cancel token 可以用于多个请求,当一个cancel token取消时,所有使用该cancel token的请求都会被取消。
* 所以参数可选
*/
void cancelRequests(CancelToken token) {
token.cancel("cancelled");
}
}
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