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//For  empty trash

String  params = "uid=" + user + "&pwd=" + pass +  "&pvtkey=" + key;

URL  evsURL = new URL("https://<server address>/evs/emptyTrash");

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

con.setRequestMethod("POST");

con.setRequestProperty("Content-Type","application/x-www-form-urlencoded;   charset=UTF-8");

con.setDoOutput(true);

con.setDoInput(true);

con.setUseCaches(false);

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

dout.writeBytes(params);

dout.flush();

dout.close();

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

while  ((str = in.readLine()) != null)

{

result  += str;

}