在Java中将推送通知从服务器发送到Android设备 [英] Send push notification from server to android device in Java
问题描述
我试图发送推送通知我的应用服务器到Android设备。
我想使用标准的Java包，尽量不要使用Vert.x，apache的httpClient等等。
这是我的代码：
pre $ public $ sendNotification（String messageBody）
{
尝试
{
网址=新网址（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;
字符串凭证=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 \：\这是我的标题 };
String dataStr ={\key1 \：\value1 \，\key2 \：\value2 \};
字符串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（））））;
字符串输出;
System.out.println（从服务器.... \\\
输出）; （（output = br.readLine（））！= null）{
System.out.println（output）;
while
}
conn.disconnect（）;
catch（Exception e）
{
e.printStackTrace（）;
$ p我得到的回应码是401， ...我猜凭证的格式是错误的...
json字符串是有效的json格式，所以我不打扰使用JSONObject。 p>
对于字符串凭证，我尝试了key：+ apiKey;但仍然得到了相同的结果。
apiKey字符串是从我从Firebase控制台下载的google-services.json中复制的。 b
$ b
谷歌没有给出一个很好的例子...只是给了我这个： https://firebase.google.com/docs/cloud-messaging/downstream
如果有人知道怎么做，请回复。感谢!!
pre $ public class FCMNotification {
//将通知从服务器发送到客户端的方法。
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; //你FCM AUTH键
字符串FMCurl = API_URL_FCM;
URL url =新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标题）; //通知标题
info.put（body，Hello First Test notification）; //通知主体
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（）; （（inputLine = in.readLine（））！= null）{
response.append（inputLine）;
}
in.close（）;
$ b @SuppressWarnings（static-access）
public static void main（String [] args）throws Exception {
FCMNotification obj =新的FCMNotification（）;
obj.pushFCMNotification（
USER_DEVICE_TOKEN）;
}
}
I am struggling with the new FCM... I used FCM before, now I am trying FCM...
I am trying to send push notification for my app server to android device.
I wanna use the standard Java package, try not to use others such as Vert.x, apache's httpClient etc...
here is my code:
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();
}
}
the response code i got is 401, which means unauthorized... i guess the format of credential is wrong...
The json string is in valid json format, so i don't bother to use JSONObject.
For the string credentials, i have tried "key:" + apiKey; but still got the same result.
The apiKey String is copied from the google-services.json I downloaded from Firebase console in google.
google didn't give a good example... just gave me this: https://firebase.google.com/docs/cloud-messaging/downstream
If any one knows how to do it, please reply. Thanks!!
FULL EXAMPLE USE THIS FOR SEND NOTIFICATION USING FCM IN JAVA
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 obj = new FCMNotification();
obj.pushFCMNotification(
"USER_DEVICE_TOKEN");
}
}
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