Dio _dio;
BaseOptions _options;
//单例模式，只创建一次实例
static HttpManager getInstance(){
if(null == _instance){
_instance = new HttpManager();
return _instance;
}
}
//构造函数
HttpManager(){
_options =new BaseOptions(
baseUrl: _BASEURL,
//连接时间为5秒
connectTimeout: _CONNECTTIMEOUT,
//响应时间为3秒
receiveTimeout: _RECEIVETIMEOUT,
//设置请求头
headers: {
"resource":"android"
},
//默认值是"application/json; charset=utf-8",Headers.formUrlEncodedContentType会自动编码请求体.
contentType: Headers.formUrlEncodedContentType,
//共有三种方式json,bytes(响应字节),stream（响应流）,plain
responseType: ResponseType.json
);
_dio = new Dio(_options);
//设置Cookie
_dio.interceptors.add(CookieManager(CookieJar()));
//添加拦截器
_dio.interceptors.add(InterceptorsWrapper(
onRequest: (RequestOptions options){
print("在请求之前的拦截信息");
return options;
},
onResponse: (Response response){
print("在响应之前的拦截信息");
return response;
},
onError: (DioError e){
print("在错误之前的拦截信息");
return e;
}
));
}
//get请求方法
get(url,{data,options,cancelToken}) async{
Response response;
try{
response = await _dio.get(url,queryParameters: data,options: options,cancelToken: cancelToken);
print('getHttp response: $response');
}on DioError catch(e){
print('getHttp exception: $e');
formatError(e);
}
return response;
}
//post请求
post(url,{params,options,cancelToken}) async{
Response response;
try{
response = await _dio.post(url,queryParameters: params,options: options,cancelToken: cancelToken);
print('postHttp response: $response');
}on DioError catch(e){
print('postHttp exception: $e');
formatError(e);
}
return response;
}
//post Form请求
postForm(url,{data,options,cancelToken}) async{
Response response;
try{
response = await _dio.post(url,options: options,cancelToken: cancelToken,data: data);
print('postHttp response: $response');
}on DioError catch(e){
print('postHttp exception: $e');
formatError(e);
}
return response;
}
//下载文件
downLoadFile(urlPath,savePath) async{
Response response;
try{
response = await _dio.download(urlPath, savePath,onReceiveProgress: (int count,int total){
print('$count $total');
});
print('downLoadFile response: $response');
}on DioError catch(e){
print('downLoadFile exception: $e');
formatError(e);
}
return response;
}
//取消请求
cancleRequests(CancelToken token){
token.cancel("cancelled");
}
void formatError(DioError e) {
if (e.type == DioErrorType.CONNECT_TIMEOUT) {
print("连接超时");
} else if (e.type == DioErrorType.SEND_TIMEOUT) {
print("请求超时");
} else if (e.type == DioErrorType.RECEIVE_TIMEOUT) {
print("响应超时");
} else if (e.type == DioErrorType.RESPONSE) {
print("出现异常");
} else if (e.type == DioErrorType.CANCEL) {
print("请求取消");
} else {
print("未知错误");
}
}
}
调用时只需：
http.HttpManager.getInstance().get('',params:{'key': 'free','msg': '鹅鹅鹅'});
输出：
2020-04-17 14:42:30.252 25364-25460/com.example.flutter\_module.host I/flutter: 在请求之前的拦截信息
2020-04-17 14:42:31.145 25364-25460/com.example.flutter\_module.host I/flutter: 在响应之前的拦截信息
2020-04-17 14:42:31.148 25364-25460/com.example.flutter\_module.host I/flutter: getHttp response: {"result":0,"content":"曲项向天歌"}
其实我觉得响应结果转为json就很好用了，如果喜欢转为实体类，自己再稍加封装就好。
