Java Backend Sample
Send push notifications to your users with this Java code sample.
Warning: This sample code is for Java server-side use only. Do NOT send push notifications directly from your Android application, otherwise, your Secret API Key will be compromised.
The following code will send a push notification to devices with {message: "Hello World!"} as the payload.
public static void sendSamplePush() {
// Prepare list of target device tokens
List<String> deviceTokens = new ArrayList<>();
// Add your device tokens here
deviceTokens.add("cdd92f4ce847efa5c7f");
// Convert to String[] array
String[] to = deviceTokens.toArray(new String[deviceTokens.size()]);
// Optionally, send to a publish/subscribe topic instead
// String to = '/topics/news';
// Set payload (any object, it will be serialized to JSON)
Map<String, String> payload = new HashMap<>();
// Add "message" parameter to payload
payload.put("message", "Hello World!");
// iOS notification fields
Map<String, Object> notification = new HashMap<>();
notification.put("badge", 1);
notification.put("sound", "ping.aiff");
notification.put("title", "Test Notification");
notification.put("body", "Hello World \u270c");
// Prepare the push request
PushyAPI.PushyPushRequest push = new PushyAPI.PushyPushRequest(payload, to, notification);
try {
// Try sending the push notification
PushyAPI.sendPush(push);
}
catch (Exception exc) {
// Error, print to console
System.out.println(exc.toString());
}
}Create a file named PushyAPI.java and paste the following code inside it:
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.util.EntityUtils;
import org.apache.http.entity.ByteArrayEntity;
import java.util.Map;
public class PushyAPI {
public static ObjectMapper mapper = new ObjectMapper();
// Insert your Secret API Key here
public static final String SECRET_API_KEY = "SECRET_API_KEY";
public static void sendPush(PushyPushRequest req) throws Exception {
// Get custom HTTP client
HttpClient client = new DefaultHttpClient();
// Create POST request
HttpPost request = new HttpPost("https://api.pushy.me/push?api_key=" + SECRET_API_KEY);
// Set content type to JSON
request.addHeader("Content-Type", "application/json");
// Convert post data to JSON
byte[] json = mapper.writeValueAsBytes(req);
// Send post data as byte array
request.setEntity(new ByteArrayEntity(json));
// Execute the request
HttpResponse response = client.execute(request, new BasicHttpContext());
// Get response JSON as string
String responseJSON = EntityUtils.toString(response.getEntity());
// Convert JSON response into HashMap
Map<String, Object> map = mapper.readValue(responseJSON, Map.class);
// Got an error?
if (map.containsKey("error")) {
// Throw it
throw new Exception(map.get("error").toString());
}
}
public static class PushyPushRequest {
public Object to;
public Object data;
public Object notification;
public PushyPushRequest(Object data, Object to, Object notification) {
this.to = to;
this.data = data;
this.notification = notification;
}
}
}Note: Make sure to replace SECRET_API_KEY with your app's Secret API Key, available in the Pushy Dashboard (Click your app -> API Authentication tab). This is a backend API endpoint. Never expose your application's Secret API Key in your client code.