http
集成http库
https://pub.dartlang.org/packages/http
添加依赖
dependencies:
http: ^0.12.
安装
flutter packages get
导入
import 'package:http/http.dart' as http;
常用方法
get(dynamic url, { Map<String, String> headers }) → Future<Response>
- (必须)url:请求地址
- (可选)headers:请求头
post(dynamic url, { Map<String, String> headers, dynamic body, Encoding encoding }) → Future<Response>
- (必须)url:请求地址
- (可选)headers:请求头
- (可选)body:参数
- (编码)Encoding:编码 例子
http.post('https://flutter-cn.firebaseio.com/products.json',
body: json.encode(param),encoding: Utf8Codec())
.then((http.Response response) {
final Map<String, dynamic> responseData = json.decode(response.body);
//处理响应数据
}).catchError((error) {
print('$error错误');
});
返回值都用到Dart Futures, 类似JavaScript中的promise 官方推荐使用async/await来调用网络请求
void addProduct(Product product) async {
Map<String, dynamic> param = {
'title': product.title,
'description': product.description,
'price': product.price
};
try {
final http.Response response = await http.post(
'https://flutter-cn.firebaseio.com/products.json',
body: json.encode(param),
encoding: Utf8Codec());
final Map<String, dynamic> responseData = json.decode(response.body);
print('$responseData 数据');
} catch (error) {
print('$error错误');
}
}
用 try catch来捕获错误 两种写法都可以,个人觉得第二种语法思路更明确.