android错误转换结果java.io.FileNotFoundException

我已经在post中创建了一个API方法，该方法在postman中运行良好，即提供了所需的响应。但在Android中使用该API时，会出现以下错误：

转换结果java.io.FileNotFoundException时出错，分析数据org.json.jsoneException时出错：输入结束，位于的字符0处

我将感谢任何人指导我如何做到这一点

下面是

jsonparser

的

makeHttpRequest

方法的代码：

public JSONObject makeHttpRequest2(String url2 , String method,
                   String name, String password) throws IOException {

  // Making HTTP request
  try {

    // check for request method
    if (method == "POST") {
      // request method is POST

      url = new URL(url2);
      conn = (HttpURLConnection) url.openConnection();
      conn.setDoOutput(true);
      conn.setRequestMethod("POST");
      conn.setUseCaches(false);
      conn.setConnectTimeout(10000);
      conn.setReadTimeout(10000);
      conn.setRequestProperty("Content-Type", "application/json");
      conn.setRequestProperty("Host", "android.schoolportal.gr");
      conn.connect();

      JSONObject jsonParam = new JSONObject();
      jsonParam.put("name", name);
      //jsonParam.put("email", email);
      jsonParam.put("password", password);
      Log.d("json",String.valueOf(jsonParam));
      OutputStreamWriter out=new OutputStreamWriter(
      conn.getOutputStream());
      out.write(jsonParam.toString());
      out.close();

    }
  } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
  } catch (IOException e) {
    e.printStackTrace();
  } catch (JSONException e) {
    e.printStackTrace();
  }

  try {
    InputStream is = conn.getInputStream();
    BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "UTF-8"), 8);
    StringBuilder sb = new StringBuilder();
    String line = null;
    while ((line = reader.readLine()) != null) {
      sb.append(line + "\n");
    }
    is.close();
    json = sb.toString();
    Log.e("JSON", json);
  } catch (Exception e) {
    Log.e("Buffer Error", "Error converting result " + e.toString());
  }
  // try parse the string to a JSON object

  try {
    jObj = new JSONObject(json);
  } catch (JSONException e) {
    Log.e("JSON Parser", "Error parsing data " + e.toString());
  }
  Log.d("json3",String.valueOf(json));
  // return JSON String
  return jObj;

}

将此添加到您的代码中：

conn.setDoInput(true); //After or before of setDoOutput(true) for organization :)
conn.setChunkedStreamingMode(0);
conn.setRequestProperty("Content-Type", "application/json; charset=utf-8");

编辑：
如果需要为服务器上载JSON，请执行以下操作：

conn.setRequestProperty("Content-Length", "" + Integer.toString(JsonObjectstr.getBytes().length)); // Get the json string length

---

首先，在调用

conn.getInputStream（）之前，您没有检查请求是否成功如果请求失败，则流为空，您需要调用

new BufferedReader(new InputStreamReader(connection.getErrorStream()));

给你的问题是什么行号？如果打印JSON以确保响应是有效的JSON