java - 通过 HTTP 从 android 应用程序发送到 nodejs 服务器后，我的 JSON 看起来不同

Question

当我尝试通过 HTTP 将 json 作为字符串发送到 nodejs 服务器时，当我尝试记录 request.body 时，它看起来不一样，我无法访问任何字段。

向服务器发送请求的类:

public class SendData extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... strings) {

        String data = "";

        HttpURLConnection httpURLConnection = null;

        try{
            httpURLConnection = (HttpURLConnection)new URL(strings[0]).openConnection();
            httpURLConnection.setRequestMethod("POST");

            httpURLConnection.setDoOutput(true);

            DataOutputStream wr = new DataOutputStream(httpURLConnection.getOutputStream());
            wr.writeBytes(strings[1]);
            wr.flush();
            wr.close();

            InputStreamReader inputStreamReader = new InputStreamReader(httpURLConnection.getInputStream());
            int inputStreamData = inputStreamReader.read();
            while (inputStreamData != -1){
                char current = (char) inputStreamData;
                inputStreamData = inputStreamReader.read();
                data += current;
            }
        } catch (Exception e){
            e.printStackTrace();
        } finally {
            if(httpURLConnection != null){
                httpURLConnection.disconnect();
            }
        }

        return data;
    }
}

服务器代码:

app.post('/', function (req, res) {
  var a = req.body;
  console.log(a);
  res.send(a);
})

JSON 看起来像这样:

{ '{"name":"ffffc","email":"asdxx","password":"ffv","tel":"111"}': '' }

但应该是这样的:

{"name":"ffffc","email":"asdxx","password":"ffv","tel":"111"}

Answer 1

您的 Java 代码需要将其 Content-Type 设置为 application/json，如下所示:

httpURLConnection.setRequestProperty("Content-Type", "application/json");