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dio
dio是一个强大的Dart Http请求库,支持Restful API、FormData、拦截器、请求取消、Cookie管理、文件上传/下载、超时等…
我们的网络请求就是在dio的基础上封装的 . 所以要引入dio包.
添加依赖
dependencies:
dio: ^x.x.x // 请使用pub上的最新版本
HttpUtil
/*
* Created by 李卓原 on 2018/9/15.
* email: [email protected]
* 网络请求封装
*/
import 'package:dio/dio.dart';
class HttpUtil {
static HttpUtil instance;
Dio dio;
Options options;
static HttpUtil getInstance() {
print('getInstance');
if (instance == null) {
instance = new HttpUtil();
}
return instance;
}
HttpUtil() {
print('dio赋值');
// 或者通过传递一个 `options`来创建dio实例
options = Options(
// 请求基地址,可以包含子路径,如: "https://www.google.com/api/".
baseUrl: "https://www.xx.com/api",
//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。如果两次间隔超过[receiveTimeout],
/// [Dio] 将会抛出一个[DioErrorType.RECEIVE_TIMEOUT]的异常.
/// 注意: 这并不是接收数据的总时限.
receiveTimeout: 3000,
headers: {},
);
dio = new Dio(options);
}
get(url, {data, options, cancelToken}) async {
print('get请求启动! url:$url ,body: $data');
Response response;
try {
response = await dio.get(
url,
data: data,
cancelToken: cancelToken,
);
print('get请求成功!response.data:${response.data}');
} on DioError catch (e) {
if (CancelToken.isCancel(e)) {
print('get请求取消! ' + e.message);
}
print('get请求发生错误:$e');
}
return response.data;
}
post(url, {data, options, cancelToken}) async {
print('post请求启动! url:$url ,body: $data');
Response response;
try {
response = await dio.post(
url,
data: data,
cancelToken: cancelToken,
);
print('post请求成功!response.data:${response.data}');
} on DioError catch (e) {
if (CancelToken.isCancel(e)) {
print('post请求取消! ' + e.message);
}
print('post请求发生错误:$e');
}
return response.data;
}
}
使用
import ‘package:flutter_oschina/utils/HttpUtil.dart’;
Future getData() async {
String url = Api.NEWS_LIST;
var data = {'pageIndex': 1, 'pageSize': 10};
var response = await HttpUtil().get(url, data: data);
setState(() {
...
});
}