從Java服務器向服務器發送推送通知

Question

我正在努力使用新的FCM ...之前我使用過FCM，現在我正在嘗試使用FCM ......

我正在嘗試將我的應用服務器的推送通知發送到Android設備。

我想使用標准的Java包，盡量不要使用其他如Vert.x，apache的httpClient等...

這是我的代碼：

public void sendNotification(String messageBody)
{
    try
    {
        URL url = new URL("https://fcm.googleapis.com/fcm/send");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/json");

        String apiKey = "AI...wE";

        String credentials = "key=" + apiKey;
        //String basicAuth = "Basic " + Base64.getEncoder().encodeToString(credentials.getBytes());

        String basicAuth = "Basic " + new String(Base64.encodeBase64(credentials.getBytes()));

        conn.setRequestProperty ("Authorization", basicAuth);

        String notfnStr = "{\"body\": \"this is my body\", \"title\": \"this is my title\"}";
        String dataStr = "{\"key1\": \"value1\", \"key2\": \"value2\"}";

        String bodyStr = "{\"priority\": \"high\", \"to\": \"dFC8GW0N1Q8:APA91bHePPmC7QVV16LGnR6rqxwreHSv1GgawijZ_dZL9T70ZkiXIV8TW_ymAWkvFfXRiWJmtR_UGBXBv2iV2UhS8M-Tndw8sf8ZW6zIqfaiiVJao3G5HFbhqgA18ukNNtW_J7JaWkz8\", " +
                "\"notification\": " + notfnStr + ", \"data\": " + dataStr + "}";

        System.out.println("### input: " + bodyStr);

        OutputStream os = conn.getOutputStream();
        os.write(bodyStr.getBytes());
        os.flush();

        if (conn.getResponseCode() != HttpURLConnection.HTTP_CREATED) {
            throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
        }

        BufferedReader br = new BufferedReader(new InputStreamReader(
                (conn.getInputStream())));

        String output;
        System.out.println("Output from Server .... \n");
        while ((output = br.readLine()) != null) {
            System.out.println(output);
        }

        conn.disconnect();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

我得到的響應代碼是401，這意味着未經授權......我猜證書的格式是錯誤的......

json字符串是有效的json格式，所以我不打算使用JSONObject。

對於字符串憑據，我嘗試過“key：”+ apiKey; 但仍然得到了相同的結果。

apiKey字符串是從google-services.json復制的，我是從谷歌的Firebase控制台下載的。

谷歌沒有給出一個很好的例子......只是給了我這個： https ： //firebase.google.com/docs/cloud-messaging/downstream

如果有人知道該怎么做，請回復。 謝謝！！

Answer 1

完整示例使用此功能在JAVA中使用FCM發送通知

public class FCMNotification {

    // Method to send Notifications from server to client end.
    public final static String AUTH_KEY_FCM = "API_KEY_HERE";
    public final static String API_URL_FCM = "https://fcm.googleapis.com/fcm/send";

    public static void pushFCMNotification(String DeviceIdKey) throws Exception {

        String authKey = AUTH_KEY_FCM; // You FCM AUTH key
        String FMCurl = API_URL_FCM;

        URL url = new URL(FMCurl);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

        conn.setUseCaches(false);
        conn.setDoInput(true);
        conn.setDoOutput(true);

        conn.setRequestMethod("POST");
        conn.setRequestProperty("Authorization", "key=" + authKey);
        conn.setRequestProperty("Content-Type", "application/json");

        JSONObject data = new JSONObject();
        data.put("to", DeviceIdKey.trim());
        JSONObject info = new JSONObject();
        info.put("title", "FCM Notificatoin Title"); // Notification title
        info.put("body", "Hello First Test notification"); // Notification body
        data.put("data", info);

        OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
        wr.write(data.toString());
        wr.flush();
        wr.close();

        int responseCode = conn.getResponseCode();
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

    }

    @SuppressWarnings("static-access")
    public static void main(String[] args) throws Exception {
        FCMNotification.pushFCMNotification("USER_DEVICE_TOKEN");
    }
}

Answer 2

你提到你從google-services.json文件獲得密鑰。 這將是您的Android API密鑰，而不是發送FCM消息所需的服務器密鑰。 在Firebase控制台中，轉至Settings > Cloud Messaging > Server key ，以獲取用於發送FCM消息的API密鑰。

Answer 3

據我所知，不需要base64編碼憑證：

String apiKey = "AI...wE";
String credentials = "key=" + apiKey;
conn.setRequestProperty ("Authorization", credentials);

Answer 4

這是一個用於從java向app android發送通知的函數。 此代碼使用JSONObject，您必須將此jar添加到項目構建路徑中。

注意：我使用fcm

import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

import org.json.JSONObject;

public class FcmNotif {
public final static String AUTH_KEY_FCM ="AIzB***********RFA";

public final static String API_URL_FCM ="https://fcm.googleapis.com/fcm/send";

         // userDeviceIdKey is the device id you will query from your database

    public void pushFCMNotification(String userDeviceIdKey, String title, String message) throws Exception{

    String authKey = AUTH_KEY_FCM;   // You FCM AUTH key
    String FMCurl = API_URL_FCM;     

    URL url = new URL(FMCurl);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();

    conn.setUseCaches(false);
    conn.setDoInput(true);
    conn.setDoOutput(true);

    conn.setRequestMethod("POST");
    conn.setRequestProperty("Authorization","key="+authKey);
    conn.setRequestProperty("Content-Type","application/json");

    JSONObject json = new JSONObject();
    json.put("to",userDeviceIdKey.trim());
    JSONObject info = new JSONObject();
    info.put("title", title); // Notification title
    info.put("body", message); // Notification body
    info.put("image", "https://lh6.googleusercontent.com/-sYITU_cFMVg/AAAAAAAAAAI/AAAAAAAAABM/JmQNdKRPSBg/photo.jpg");
    info.put("type", "message");
    json.put("data", info);
    System.out.println(json.toString());

    OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
    wr.write(json.toString());
    wr.flush();
    conn.getInputStream();
    }
    }

祝好運