dart:io
import 'dart:async';
import 'dart:io';
import 'dart:convert';
_getIPAddress() async {
var url = 'https://httpbin.org/ip';
var httpClient = new HttpClient();
String result;
try {
var request = await httpClient.getUrl(Uri.parse(url));
var response = await request.close();
//HttpStatus状态常量都变为小写
if (response.statusCode == HttpStatus.ok) {
//在dart2.0之后为大写的UTF8改为小写utf8
var json = await response.transform(utf8.decoder).join();
//JSON改为JsonCodec和JsonDecoder
JsonCodec jsonCodec = new JsonCodec();
var data = jsonCodec.decode(json);
result = data['origin'];
} else {
result =
'Error getting IP address:\nHttp status ${response.statusCode}';
}
} catch (exception) {
result = 'Failed getting IP address';
}
// If the widget was removed from the tree while the message was in flight,
// we want to discard the reply rather than calling setState to update our
// non-existent appearance.
if (!mounted) return;
setState(() {
_ipAddress = result;
});
}
