问Yelp Fusion POST请求

EN

public static final String YELPURL = "https://api.yelp.com/oauth/token";
public static void main(String[] args) {
    try {
        URL obj = new URL(YELPURL);
        HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();
        con.setRequestMethod("POST");
        con.setRequestProperty("grant_type", "client_credentials");
        con.setRequestProperty("client_id", CLIENTID);
        con.setRequestProperty("client_secret", CLIENTSECRET);
        con.setDoOutput(true);
        int responseCode = con.getResponseCode();
        System.out.println("Response Code: " + responseCode);   
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}