我正在使用Android asyntask与Pycharm（python with flask）服务器，它将返回一个数组。当我尝试与服务器连接时，它将显示连接被拒绝。 我需要解决方案，为什么它显示连接被拒绝的错误。
Android代码：
public static String ip = "http://192.168.43.221:3000/";
private class BackTask extends AsyncTask<String, String, String> {
private String result = null,name,batch,id,dept,dob,phno,add,credits;
@Override
protected String doInBackground(String... params) {
try {
String data = URLEncoder.encode("device", "UTF-8") + "=" +
URLEncoder.encode(device, "UTF-8") + "&" +
URLEncoder.encode("ID", "UTF-8") + "=" +
URLEncoder.encode(regno1, "UTF-8") + "&" +
URLEncoder.encode("Password", "UTF-8") + "=" +
URLEncoder.encode(password1, "UTF-8");
BufferedReader reader = null;
Log.d("checking", data);
try {
URL url = new URL(ip + "login/");
URLConnection con = url.openConnection();
con.setDoOutput(true);
OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream());
writer.write(data);
writer.flush();
//getting response back
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
Toast.makeText(getBaseContext(),reader.readLine(),Toast.LENGTH_LONG).show();
StringBuilder s = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
s.append(line + "\n");
}
result = s.toString();
} catch (Exception e) {
// Toast.makeText(getBaseContext(),"Connection error",Toast.LENGTH_LONG).show();
e.printStackTrace();
}
} catch (UnsupportedEncodingException e) {
Toast.makeText(getBaseContext(),"Connection error",Toast.LENGTH_LONG).show();
e.printStackTrace();
}
return result;
}
@Override
protected void onPostExecute(String result) {
Toast.makeText(getBaseContext(), result, Toast.LENGTH_LONG).show();
SharedPreferences.Editor e = sp1.edit();
if(!sp1.equals(null))
{
e.putString("uname", regno1);
e.putString("pass", password1);
e.apply();
}
// progress.dismiss();
//notification.setText(result);
if (result != null) {
Toast.makeText(getBaseContext(), result, Toast.LENGTH_SHORT).show();
result = result.trim();
name= setDetails(result);
if (name.equals("success")) {
Intent intent1 = new Intent(LoginActivity.this, HrActivity.class);
//intent.putExtra("json",result);
startActivity(intent);
} else {
errormsg.setText("*Check id / password");
}
}
}
@Override
protected void onPreExecute() {
progress.show();
}
@Override
protected void onProgressUpdate(String... text) {
// progress. For example updating ProgessDialog
}
logcat的：
03-12 13:52:48.194 23394-23527/com.example.dinesh.eis W/System.err: at libcore.io.IoBridge.isConnected(IoBridge.java:267)
03-12 13:52:48.194 23394-23527/com.example.dinesh.eis W/System.err: at libcore.io.IoBridge.connectErrno(IoBridge.java:191)
03-12 13:52:48.194 23394-23527/com.example.dinesh.eis W/System.err: at libcore.io.IoBridge.connect(IoBridge.java:127)
03-12 13:52:48.194 23394-23527/com.example.dinesh.eis W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:188)
03-12 13:52:48.194 23394-23527/com.example.dinesh.eis W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:461)
03-12 13:52:48.194 23394-23527/com.example.dinesh.eis W/System.err: at java.net.Socket.connect(Socket.java:918)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at com.android.okhttp.internal.Platform.connectSocket(Platform.java:174)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at com.android.okhttp.Connection.connect(Connection.java:152)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:282)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:216)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:391)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:106)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:217)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at com.example.dinesh.eis.LoginActivity$BackTask.doInBackground(LoginActivity.java:121)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at com.example.dinesh.eis.LoginActivity$BackTask.doInBackground(LoginActivity.java:101)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:292)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-12 13:52:48.195 23394-23527/com.example.dinesh.eis W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-12 13:52:48.197 23394-23527/com.example.dinesh.eis W/System.err: at java.lang.Thread.run(Thread.java:818)
03-12 13:52:48.197 23394-23527/com.example.dinesh.eis W/System.err: Caused by: android.system.ErrnoException: isConnected failed: ECONNREFUSED (Connection refused)
03-12 13:52:48.198 23394-23527/com.example.dinesh.eis W/System.err: at libcore.io.IoBridge.isConnected(IoBridge.java:252)
03-12 13:52:48.198 23394-23527/com.example.dinesh.eis W/System.err: ... 20 more