java 发送http json请求

public void getRemoteId(HttpServletRequest request,Model model){
String name = request.getParameter("userName");
String gender = request.getParameter("userGender");
String birthDate = request.getParameter("birthDate");
String birthHour = request.getParameter("birthHour");
String birthMin = request.getParameter("birthMin");
birthDate +=" "+birthHour+":"+birthMin;
String addrId = request.getParameter("borough");
String productId = request.getParameter("ProductId");
String birthDateAccurate = request.getParameter("BirthAccurateSelect");
String add_url = "http://test.com:8080/report.jo";
String query = " {\"mainUser\":{\"name\":\""+name+"\",\"gender\":\""+gender+"\",\"birthDate\":\""+birthDate+"\",\"birthDateAccurate\":\""+birthDateAccurate+"\",\"addrId\":\""+addrId+"\"},\"productId\":\""+productId+"\"}";
try {
URL url = new URL(add_url);
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setUseCaches(false);
connection.setInstanceFollowRedirects(true);
connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
connection.connect();
DataOutputStream out = new DataOutputStream(connection.getOutputStream());
JSONObject obj = new JSONObject();

String token = "d5f224c9f83874da5b5025794c773e8e";
obj.put("query", query);
obj.put("token", token);
out.writeBytes(obj.toString());
out.flush();
out.close();

BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String lines;
StringBuffer sbf = new StringBuffer();
while ((lines = reader.readLine()) != null) {
lines = new String(lines.getBytes(), "utf-8");
sbf.append(lines);
}
System.out.println(sbf);
reader.close();
// 断开连接
connection.disconnect();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}