[英]Sending a POST request to a server
I am trying to create my first android application that utilizes a REST api.我正在尝试创建我的第一个使用 REST api 的 android 应用程序。 My api is written in Node.JS and has already been tested using Postman, however, I am having trouble sending JSON data to my api.我的 api 是用 Node.JS 编写的,并且已经使用 Postman 进行了测试,但是,我无法将 JSON 数据发送到我的 api。
@Override
protected String doInBackground(String... params) {
String data = "";
String urlName = params[0];
HttpURLConnection httpURLConnection = null;
try {
httpURLConnection = (HttpURLConnection) new URL(urlName).openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(httpURLConnection.getOutputStream());
wr.writeBytes(params[1]);
wr.flush();
wr.close();
InputStream in = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(in);
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;
}
I always reach the line that declares and initializes my DataOutputSteam and doesn't execute the code.我总是到达声明和初始化我的 DataOutputSteam 并且不执行代码的行。 I am not even getting a log that my Virtual device has visited my server at all.我什至没有收到我的虚拟设备访问我的服务器的日志。
I have included in the manifest XML both of these already.我已经在清单 XML 中包含了这两个。
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
Based on your logs, you're hitting a NetworkOnMainThreadException
and that's preventing the network request from being executed (it's going into your catch
block instead).根据您的日志,您遇到了NetworkOnMainThreadException
并且这阻止了网络请求被执行(它会进入您的catch
块)。 This suggests you aren't calling your AsyncTask correctly - ensure that you're calling execute
instead of calling doInBackground
.这表明您没有正确调用 AsyncTask - 确保您调用的是execute
而不是调用doInBackground
。 See also here for more information on this general pattern.另请参阅此处了解有关此一般模式的更多信息。
Try this, it is for POST method that accept 2 parameter email and password.试试这个,它是用于接受 2 个参数电子邮件和密码的 POST 方法。 Change it based on your requirement根据您的要求更改它
URL url = new URL(Login_url);
HttpURLConnection conn = (HttpURLConnection) new URL(urlName).openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Accept" , "application/json");
conn.connect();
Uri.Builder builder = new Uri.Builder()
.appendQueryParameter("email", "Your_Email")
.appendQueryParameter("password","Your_Password");
String query = builder.build().getEncodedQuery();
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
code = conn.getResponseCode();
Log.e("Result", code + "");
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
Log.e("Result",result.toString());
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