首先你需要导入：
dio: ^2.1.3
cookie_jar: ^1.0.0
import 'dart:io';
import 'package:dio/dio.dart';
import 'package:cookie_jar/cookie_jar.dart';
class HttpGo {
static final StringGET ="get";
static final StringPOST ="post";
static final StringDATA ="data";
static final StringCODE ="errorCode";
Diodio;
static HttpGo_instance;
BaseOptionsoptions;
static HttpGogetInstance() {
if (_instance ==null) {
_instance =HttpGo();
}
return _instance;
}
HttpGo() {
//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 =new BaseOptions(
//请求基地址,可以包含子路径
baseUrl:"http://192.168.5.6:8085",
//Http请求头
headers: {'platform':'android', 'version':11.0},
//连接服务器超时时间，单位是毫秒.
connectTimeout:5000,
//响应流上前后两次接受到数据的间隔，单位为毫秒。
receiveTimeout:100000,
//请求的Content-Type，默认值是[ContentType.json]. 也可以用ContentType.parse("application/x-www-form-urlencoded")
contentType: ContentType.json,
//表示期望以那种格式(方式)接受响应数据。接受三种类型 `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");
return options;
},onResponse: (Response response){
print("响应之前");
return response;
},onError: (DioError e){
print("错误之前");
return e;
}));
}
/*
* 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 DioErrorcatch (e) {
print('get error---------$e');
formatError(e);
}
return response.data;
}
/*
* post请求*/
post(url, {data, options, cancelToken})async {
Response response;
try {
response =await dio.post(url, queryParameters: data, options: options, cancelToken: cancelToken);
print('post success---------${response.data}');
}on DioErrorcatch (e) {
print('post error---------$e');
formatError(e);
}
return response.data;
}
/*
* 下载文件*/
downloadFile(urlPath, savePath)async {
Response response;
try {
response =await dio.download(urlPath, savePath,onReceiveProgress: (int count, int total){
//进度
print("$count $total");
});
print('downloadFile success---------${response.data}');
}on DioErrorcatch (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");
}
}