这是一个工作示例：
static String key = "---myKey---";static String secret = "---mySecret---";String nonce, signature, data, path;static String domain = "https://api.kraken.com";void account_balance() { nonce = String.valueOf(System.currentTimeMillis()); data = "nonce=" + nonce; path = "/0/private/Balance"; calculateSignature(); String answer = post(domain + path, data); // on empty accounts, returns {"error":[],"result":{}} // this is a known Kraken bug ...}String post(String address, String output) { String answer = ""; HttpsURLConnection c = null; try { URL u = new URL(address); c = (HttpsURLConnection)u.openConnection(); c.setRequestMethod("POST"); c.setRequestProperty("API-Key", key); c.setRequestProperty("API-Sign", signature); c.setDoOutput(true); DataOutputStream os = new DataOutputStream(c.getOutputStream()); os.writeBytes(output); os.flush(); os.close(); BufferedReader br = null; if(c.getResponseCode() >= 400) { System.exit(1); } br = new BufferedReader(new InputStreamReader((c.getInputStream()))); String line; while ((line = br.readLine()) != null) answer += line; } catch (Exception x) { System.exit(1); } finally { c.disconnect(); } return answer; }void calculateSignature() { signature = ""; try { MessageDigest md = MessageDigest.getInstance("SHA-256"); md.update((nonce + data).getBytes()); Mac mac = Mac.getInstance("HmacSHA512"); mac.init(new SecretKeySpec(base64.deprebase64(secret.getBytes()), "HmacSHA512")); mac.update(path.getBytes()); signature = new String(base64.enprebase64(mac.doFinal(md.digest()))); } catch(Exception e) {} return;}
