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| import "dart:async"; | |
| import "dart:io"; | |
| import "dart:math"; | |
| String generateToken(int length) { | |
| var r = new Random(); | |
| var buffer = new StringBuffer(); | |
| for (int i = 1; i <= length; i++) { | |
| if (r.nextBool()) { | |
| String letter = alphabet[r.nextInt(alphabet.length)]; | |
| buffer.write(r.nextBool() ? letter.toLowerCase() : letter); | |
| } else { | |
| buffer.write(numbers[r.nextInt(numbers.length)]); | |
| } | |
| } | |
| return buffer.toString(); | |
| } | |
| main() async { | |
| var server = await ServerSocket.bind(InternetAddress.ANY_IP_V4, 1234); | |
| server.listen(handleClient); | |
| } | |
| handleClient(Socket client) async { | |
| new Timer.periodic(const Duration(seconds: 2), (timer) { | |
| client.write(generateToken(50)); | |
| }); | |
| } | |
| const List<String> alphabet = const [ | |
| "A", | |
| "B", | |
| "C", | |
| "D", | |
| "E", | |
| "F", | |
| "G", | |
| "H", | |
| "I", | |
| "J", | |
| "K", | |
| "L", | |
| "M", | |
| "N", | |
| "O", | |
| "P", | |
| "Q", | |
| "R", | |
| "S", | |
| "T", | |
| "U", | |
| "V", | |
| "W", | |
| "X", | |
| "Y", | |
| "Z" | |
| ]; | |
| const List<int> numbers = const [ | |
| 0, | |
| 1, | |
| 2, | |
| 3, | |
| 4, | |
| 5, | |
| 6, | |
| 7, | |
| 8, | |
| 9 | |
| ]; |
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