dart - Google Dart简单联系表单

Question

我正在尝试在Dart中创建联系表。到目前为止，我可以理解服务器需要包含以下内容:

服务器

app.addRequestHandler(
  (req) => req.method == 'POST' && req.path == '/adduser',
    (req, res) {
      //process json data
    };
  }
);

并为客户提供表格:

<form method="post" action="/adduser">
  <fieldset>
    <legend>Add a user</legend>
    <p><label>First name</label>
    <input name="user[first_name]"/></p>

    <p><label>Email</label>
    <input name="user[email]"/></p>

    <p class="actions"><input type="submit" value="Save"/></p>
  </fieldset>
</form>

在客户端需要做什么才能将json数据发送到服务器端？

json是处理表单所必需的还是有更好的方法？

Answer 1

您可以将form直接提交到服务器。内容将在post请求的正文中以URL编码发送。在服务器上，您可以使用 query_string package available on pub解码数据。

将query_string添加到您的pubspec.yaml文件中:

dependencies:
  query_string: ">=1.0.0 <2.0.0"

您的服务器代码如下所示:

import 'dart:io';
import 'package:query_string/query_string.dart';

main() {
  final server = new HttpServer();
  server.listen('127.0.0.1', 8081);
  server.addRequestHandler((req) => req.method.toUpperCase() == 'POST' 
      && req.path == '/adduser', (request, response) {
    readStreamAsString(request.inputStream).then((body) {
      final params = QueryString.parse("?${body}");
      print(params["user[first_name]"]);
      print(params["user[email]"]);
      response.statusCode = HttpStatus.CREATED;
      response.contentLength = 0;
      response.outputStream.close();
    });
  });
}

Future<String> readStreamAsString(InputStream stream) {
  final completer = new Completer();
  final sb = new StringBuffer();
  final sis = new StringInputStream(stream);
  sis
    ..onData = () { sb.add(sis.read()); }
    ..onClosed = () { completer.complete(sb.toString()); }
    ..onError = (e) { completer.completeException(e); };
  return completer.future;
}