我在編碼方面還很陌生，希望能得到解決問題的建議。我正在編寫一個 java 代碼來連接到 trade.io API，但我不知道如何使用“POST”和“DELETE”向交易所提交正確的加密消息。到目前為止，我設法弄清楚了如何使用“GET”接收信息，但在其他方面沒有成功。這是我到目前為止寫的：/** CancelOrder cancels an existing order ==> This doesn't work!*/    public String CancelOrder(String orderId) throws MalformedURLException,         IOException {        return signAndSend("/order/" + orderId, "DELETE");    }        /*      * Reads the open orders in the account ==> This works!     */    public String getOpenOrders(String symbol) throws MalformedURLException,         IOException {        return signAndSend("/openOrders/" + symbol, "GET");    }    /*     * Signs and Sends signature. This method is called when signature is       needed.     */    private String signAndSend(String url, String method) throws     MalformedURLException, IOException {        String nonce = String.valueOf(System.currentTimeMillis());        String baseUrl = UrlTradeio.urlV1;        String ts = "?ts=" + nonce;        String sign = hmac512Digest(ts, TRADEIO_SECRET_KEY).toUpperCase();        HttpURLConnection con = (HttpURLConnection) new URL(baseUrl + url + ts).openConnection();        con.setRequestProperty("Sign", sign);        con.setRequestProperty("Key", TRADEIO_API_KEY);        con.setRequestMethod(method);        con.connect();        InputStream response = con.getInputStream();//        try (Scanner scanner = new Scanner(response)) {            String responseBody = scanner.next();            return responseBody;        }    }交易所在此處提供了非常詳盡的 C# 示例：https://github.com/tradeio/api-csharpclient/blob/master/Tradeio.Client/TradeioApi.cs這是“getOpenOrders”的輸出和我嘗試關閉它時的錯誤消息。線程“main”中的異常 java.io.IOException：服務器返回 HTTP 響應代碼：403 URL：https ://api.exchange.trade.io/api/v1/order/-72057593948251267?ts= 1559338452695 at java.base /sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1913)