dio的使用方式有很多，我就只选出我认为最好用的api方式做下记录,把get成post就是post请求了,网络请求都用的百度的api，实际上的response没有任何意义，所以只要打印出response有值即可。

1.最简单的请求例子,网络请求是异步的所以用async await

import 'package:flutter/material.dart';

import 'package:dio/dio.dart';

import 'dart:io';

void main() async{

Dio dio = Dio();

final response = await dio.get("https://www.baidu.com/");

print(response);

}

2.带有参数的get请求

void main() async{

Map paras = {"wd":"帅气的阿斌"};

Dio dio = Dio();

final response = await dio.get(

"https://www.baidu.com/s",

queryParameters: paras);

print(response);

}

3.自定义请求头,可定义的请求头dart已经为我们提供了专门的类存了对应的字符,引入以下库，就能使用HttpHeaders

import 'dart:io';

一般我们请求接收到的数据是json格式，如'accept: application/json',我们就可以这样自定义请求头

void main() async{

Options options = Options(headers: {HttpHeaders.acceptHeader:"accept: application/json"});

Map paras = {"wd":"帅气的阿斌"};

Dio dio = Dio();

final response = await dio.get(

"https://www.baidu.com/s",

queryParameters: paras,

options: options);

print(response);

}

4.使用Baseoptions

BaseOptions options = BaseOptions(

method: "get",

baseUrl: "https://www.baidu.com",

queryParameters: {

"areaCode": "",

"cateId":

"1e4bbe70-82d9-48a4-b01c-c61cb6d9096c",

"wd":"帅气的阿斌"

},

headers: {

HttpHeaders.acceptHeader: "*"

});

Dio netRequest = Dio(options);

final response = await netRequest.get('/s);

print(response);

其他详细参数设置参考如下:

abstract class HttpHeaders {

static const acceptHeader = "accept";

static const acceptCharsetHeader = "accept-charset";

static const acceptEncodingHeader = "accept-encoding";

static const acceptLanguageHeader = "accept-language";

static const acceptRangesHeader = "accept-ranges";

static const ageHeader = "age";

static const allowHeader = "allow";

static const authorizationHeader = "authorization";

static const cacheControlHeader = "cache-control";

static const connectionHeader = "connection";

static const contentEncodingHeader = "content-encoding";

static const contentLanguageHeader = "content-language";

static const contentLengthHeader = "content-length";

static const contentLocationHeader = "content-location";

static const contentMD5Header = "content-md5";

static const contentRangeHeader = "content-range";

static const contentTypeHeader = "content-type";

static const dateHeader = "date";

static const etagHeader = "etag";

static const expectHeader = "expect";

static const expiresHeader = "expires";

static const fromHeader = "from";

static const hostHeader = "host";

static const ifMatchHeader = "if-match";

static const ifModifiedSinceHeader = "if-modified-since";

static const ifNoneMatchHeader = "if-none-match";

static const ifRangeHeader = "if-range";

static const ifUnmodifiedSinceHeader = "if-unmodified-since";

static const lastModifiedHeader = "last-modified";

static const locationHeader = "location";

static const maxForwardsHeader = "max-forwards";

static const pragmaHeader = "pragma";

static const proxyAuthenticateHeader = "proxy-authenticate";

static const proxyAuthorizationHeader = "proxy-authorization";

static const rangeHeader = "range";

static const refererHeader = "referer";

static const retryAfterHeader = "retry-after";

static const serverHeader = "server";

static const teHeader = "te";

static const trailerHeader = "trailer";

static const transferEncodingHeader = "transfer-encoding";

static const upgradeHeader = "upgrade";

static const userAgentHeader = "user-agent";

static const varyHeader = "vary";

static const viaHeader = "via";

static const warningHeader = "warning";

static const wwwAuthenticateHeader = "www-authenticate";