大家好，我开发了一个android应用程序，向我显示了位置和手机imei。我项目的第二部分是从android向nodejs发出发布请求，以将该数据保存到mongodb中。我不知道如何保存此数据，并且尝试了一些操作，但是我认为我做的所有事情都不对。
我已经尝试创建一个类SendPostRequest，该类是一个AsyncTask，可以将这些数据发布到nodejs，但是我认为我没有做对所有事情。
这是我来自android的MainActivity。
package com.example.locatieimei;
import android.Manifest;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import androidx.core.app.ActivityCompat;
import androidx.appcompat.app.AppCompatActivity;
import androidx.swiperefreshlayout.widget.CircularProgressDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.firestore.CollectionReference;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Iterator;
public class MainActivity extends AppCompatActivity {
private FusedLocationProviderClient client;
private TextView imei;
public double latitude;
public double longitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imei = findViewById(R.id.imei);
loadIMEI();
client = LocationServices.getFusedLocationProviderClient(this);
Button button = findViewById(R.id.Chk);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (ActivityCompat.checkSelfPermission(MainActivity.this,
Manifest.permission.ACCESS_FINE_LOCATION) !=
PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(MainActivity.this,
Manifest.permission.ACCESS_COARSE_LOCATION) !=
PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then
overriding
// public void onRequestPermissionsResult(int
requestCode, String[] permissions,
// int[]
grantResults)
// to handle the case where the user grants the
permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
client.getLastLocation().addOnSuccessListener(new
OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
if (location!=null){
TextView textView = findViewById(R.id.textView);
longitude = location.getLongitude();
latitude = location.getLatitude();
textView.setText(String.valueOf("latitudine"+longitude+
"\n"+"longitutine"+latitude));
}
}
});
}
});
}
public void loadIMEI() {
// Check if the READ_PHONE_STATE permission is already available.
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.READ_PHONE_STATE)
!= PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.READ_PHONE_STATE)) {
// get_imei_data();
} else {
ActivityCompat.requestPermissions(this, new String[]
{Manifest.permission.READ_PHONE_STATE},
MY_PERMISSIONS_REQUEST_READ_PHONE_STATE);
}
} else {
TelephonyManager mngr =
(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
IMEI = mngr.getDeviceId();
imei.setText(mngr.getDeviceId());
// READ_PHONE_STATE permission is already been granted.
}
}
private String device_unique_id;
private static String IMEI;
private static final int MY_PERMISSIONS_REQUEST_READ_PHONE_STATE = 0;
public class SendPostRequest extends AsyncTask<String, Void, String> {
@Override
protected void onPreExecute() {
}
@Override
protected String doInBackground(String... arg0) {
URL url = null;
try {
url = new URL(myurl/postdata");
InputStream inp = (InputStream) url.getContent();
Log.e("Stream", inp.toString());
JSONObject postDataParamas = new JSONObject();
postDataParamas.put("longitute", longitude);
postDataParamas.put("latitute", latitude);
postDataParamas.put("imei", imei);
HttpURLConnection conn = (HttpURLConnection)
url.openConnection();
conn.setReadTimeout(15000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
int responseCode;
try (BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"))) {
String encoded_string =
getPostDataString(postDataParamas);
writer.write(postDataParamas.toString());
writer.flush();
writer.close();
}
os.close();
responseCode = conn.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
BufferedReader in = new BufferedReader(new
InputStreamReader(conn.getInputStream()));
StringBuffer sb = new StringBuffer("");
String line = "";
while ((line == in.readLine()) != false)
sb.append(line);
in.close();
return sb.toString();
}
} catch (Exception e) {
return new String("exception"+e.getMessage());
}
};
@Override
protected void onPostExecute(String result) {
Toast.makeText(getApplicationContext(), result,
Toast.LENGTH_LONG).show();
}
public String getPostDataString(JSONObject params) throws Exception
{
StringBuilder result = new StringBuilder();
boolean first = true;
Iterator<String> itr = params.keys();
while(itr.hasNext()) {
String key = itr.next();
Object value = params.get(key);
if(first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(key, "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(value.toString(),"UTF-8"));
}
return result.toString();
}
}
}
这是server.js
var express = require('express');
var mongoose = require('mongoose');
var bodyParser = require('body-parser');
//connect to mongodb:
mongoose.connect('mongodb+srv://tudorstanciulescu:19970826@test-
srqul.mongodb.net/test?retryWrites=true&w=majority', {useNewUrlParser:
true} );
var app = express();
app.use(bodyParser.urlencoded({extended:true}));
app.use(bodyParser.json());
//route:
app.use('/api', require('./routes/api'));
app.post('/postdata',function(req,res){
console.log(req.body);
if (!req.body)
return res.sendStatus(400)
res.send('welcome, ' + req.body)
});
//start server:
app.listen(3000);
console.log('serverul porneste pe port 3000');
这是status.js
var restful = require('node-restful');
var mongoose = restful.mongoose;
var statusSchema = new mongoose.Schema({
latitudine: String,
longitudine: String,
imei: String
});
//return models
module.exports = restful.model('tblstatus', statusSchema);
这是api.js //依赖项
var express = require('express');
var router = express.Router();
//models
var Status = require('../models/status');
//routes
Status.methods(['get', 'post', 'put']);
Status.register(router, '/status');
//return router
module.exports = router;
我希望在mongodb中看到的结构可以看到imei，lat和long。我的第一个错误是错误：在onPostExecute之前的breakets上缺少return语句。现在有人该怎么办？ 顺便说一句，我不明白那个url是什么（url = new URL（myurl / postdata“）;）。我过去了ip / postdata，因为我知道那应该是我的ip，之后就是发布到nodejs的路线/ p>
找到经纬度的定位方法效果很好，imei也是如此。我唯一的问题是SendRequest方法。