Server returned HTTP response code: 415 for URL always....

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Hi, group guys.

Then I trying to use notification restful api, the curl command is ok like this:

curl -v -S -u devuser:devuser123 -F 'notification={"applicationId":"3","schemaId":"65536","topcId":"1","type":"USER"};type=application/json' -F file=@notification.json "http://192.168.1.102:8080/kaaAdmin/rest/api/sendNotification"

return :

{

  "id" : "597369b2ef540e0716903660",

  "applicationId" : "3",

  "schemaId" : "65536",

  "topicId" : "1",

  "nfVersion" : 3,

  "lastTimeModify" : 1500735922556,

  "type" : "USER",

  "body" : "GEhlbGxvIHdvcmxkIQ==",

  "expiredAt" : 1501340722555,

  "secNum" : 5

* Curl_http_done: called premature == 0

But,then I use Java HTTPUrlConnection, it was always return 415 code. 

My code is :

private void sendPost() throws Exception {

url = "http://192.168.1.102:8080/kaaAdmin/rest/api/sendNotification";

String boundary = "*****" + System.currentTimeMillis() + "********";

URL obj = new URL(url);

HttpURLConnection con = (HttpURLConnection) obj.openConnection();

con.setRequestMethod("POST");

con.setRequestProperty("User-Agent", USER_AGENT);

con.setRequestProperty("Connection", "Keep-Alive");

//con.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

con.setRequestProperty("Content-Type", "application/json");

con.setRequestProperty("Authorization", "Basic " + new String(Base64.getEncoder().encode(userpass.getBytes())));

con.setDoOutput(true);

con.setDoInput(true);

File uploadFile = new File("/Users/castle/Downloads/notification.json");

DataOutputStream outputStream = new DataOutputStream(con.getOutputStream());

FileInputStream inputStream = new FileInputStream(uploadFile);

byte[] buffer = new byte[4096];

int bytesRead = -1;

while ((bytesRead = inputStream.read(buffer)) != -1) {

outputStream.write(buffer, 0, bytesRead);

}

outputStream.write("notification={\"applicationId\":\"3\",\"schemaId\":\"65536\",\"topicId\":\"1\",\"type\":\"USER\"};type=application/json;charse=UTF-8".getBytes());

outputStream.flush();

inputStream.close();

outputStream.close();

BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));

String inputLine;

StringBuffer response = new StringBuffer();

while ((inputLine = in.readLine()) != null) {

response.append(inputLine);

}

in.close();

System.out.println(response.toString());

}

I changed a notification like 'JSONObject jsonObject = new JSONObject(new DTO(appID,schemaId,topicId,type));' or 'con.setRequestProperty("norification","param")', but is doesn't work.

The error message is :

Exception in thread "main" java.io.IOException: Server returned HTTP response code: 415 for URL: http://192.168.1.102:8080/kaaAdmin/rest/api/sendNotification

I don't have a clue how to use a Java code to send a notification, please help me, Thank you!