您必须为每个请求生成一个新的timestamp 和nonce，即每个新请求都必须有其唯一的timestamp 和nonce。
在java中，timestamp可以设置为System.currentTimeMillis()，nonce可以使用UUID(UUID.randomUUID().toString())设置。
最后，确保您的 Authorization 计算正确（我看到他们使用 API 密钥使用 HMAC-SHA1）。
我希望这会有所帮助。
编辑：怀疑是您的HMAC-SHA1 Authorization 值不正确。运行您的代码时，我得到以下响应（经过我自己的几次编码）。
Connection = keep-alive
Content-Length = 51
Content-Type = application/json
{"code":"403", "message":"HMAC validation Failure"}
确保您正确计算您的 HMAC-SHA1 值（正如我上面所说的）。
请参阅以下（更新的）代码，您可以自己编译和运行这些代码。您现在需要 Java 8，因为它带有 Base 64 编码器/解码器。
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.net.URI;
import java.net.URL;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.text.SimpleDateFormat;
import java.util.Base64;
import java.util.Date;
import java.util.TimeZone;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
//import org.apache.commons.codec.binary.Base64;
public class MainJava {
private static final String myEncoding = "UTF-8";
private static final String myMessageDigest = "SHA-1";
private static final String myKeySpec = "HmacSHA1";
private static String NEWLINE = "\n";
private static String authorizationHeader;
private static String contentSha1;
// private static String keyId = "230297";
// private static String hmacKey = "tcwR9r1OR85V9bcV5tc7a9d1XkWigjqY";
private static String ApiSecretkey = "0779eb593286b278aaf8cfcf83c8e33bc757d53a8a642b53d24d63bda844da5b";
private static String MerchantToken = "fdoa-a480ce8951daa73262734cf102641994c1e55e7cdf4c02b6";
private static String reportingToken = "e56a0223d0415067";
private static String apikey = "XSjbv8PLDINJ28qXLEYAhcrz8rxKXQ4Y";
private static long nonce;
public static String headerContentType = "application/json";
private static long epoch;
public static void main(String[] args) throws Exception {
String json_string_dataTwo = "{\"type\":\"visa\",\"cardholder_name\":\"John Smith\",\"card_number\":\"4788250000028291\",\"exp_date\":1020,\"cvv\":\"123\"}";
// String json_string =
// "{\"gateway_id\":\"AI2010-01\",\"password\":\"w226638qtot48xu503zumwt2iy46g26q\",\"transaction_type\":\"00\",\"amount\":10,\"cardholder_name\":\"test\",\"cc_number\":\"4111111111111111\",\"cc_expiry\":\"1219\"}";
String json_string_data = "{\"merchant_ref\":\"Astonishing-Sale\",\"transaction_type\":\"authorize\",\"method\":\"credit_card\",\"amount\":1299,\"currency_code\":\"USD\",\"credit_card\":"
+ json_string_dataTwo + "}";
// "{\r\n \"merchant_ref\": \"Astonishing-Sale\",\r\n \"transaction_type\": \"authorize\",\r\n \"method\": \"credit_card\",\r\n \"amount\": \"1299\",\r\n \"currency_code\": \"USD\",\r\n \"credit_card\": {\r\n \"type\": \"visa\",\r\n \"cardholder_name\": \"John Smith\",\r\n \"card_number\": \"4788250000028291\",\r\n \"exp_date\": \"1020\",\r\n \"cvv\": \"123\"\r\n }\r\n}";
epoch = System.currentTimeMillis();// / 1000;
// nonce = UUID.randomUUID().toString();
nonce = Math.abs(SecureRandom.getInstance("SHA1PRNG").nextLong());
contentSha1 = contentSha1(json_string_data);
authorizationHeader = authHeader(epoch, contentSha1);
System.out.println(excutePost(json_string_data));
}
private static String authHeader(long hashTime, String contentSha1) {
String authorizationHeader = null;
try {
String hmacString = "POST" + NEWLINE + "application/json" + NEWLINE + contentSha1 + NEWLINE + hashTime + NEWLINE + apikey + NEWLINE
+ new URI("https://api-cert.payeezy.com/v1/transactions");
return sha1(hmacString, ApiSecretkey);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private static String contentSha1(String content) throws Exception {
MessageDigest md = MessageDigest.getInstance("SHA-1");
byte[] sha1hash = new byte[40];
md.update(content.getBytes("UTF-8"), 0, content.length());
sha1hash = md.digest();
return convertToHex(sha1hash);
}
private static String convertToHex(byte[] data) {
StringBuffer buf = new StringBuffer();
for (int i = 0; i < data.length; i++) {
int halfbyte = data[i] >>> 4 & 0xF;
int two_halfs = 0;
do {
if ((0 <= halfbyte) && (halfbyte <= 9))
buf.append((char) (48 + halfbyte));
else
buf.append((char) (97 + (halfbyte - 10)));
halfbyte = data[i] & 0xF;
} while (two_halfs++ < 1);
}
return buf.toString();
}
// private static String sha1(String s, String keyString) {
// Base64 base64 = new Base64();
// try {
// SecretKeySpec key = new SecretKeySpec(keyString.getBytes("UTF-8"),
// "HmacSHA1");
// Mac mac = Mac.getInstance("HmacSHA1");
// mac.init(key);
// byte[] bytes = mac.doFinal(s.getBytes("UTF-8"));
//
// return new String(base64.encode(bytes));
// } catch (Exception e) {
// throw new RuntimeException(e);
// }
// }
private static String sha1(String s, String keyString) {
byte[] bytes = null;
try {
Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
SecretKeySpec secret_key = new SecretKeySpec(keyString.getBytes(), "HmacSHA256");
sha256_HMAC.init(secret_key);
bytes = sha256_HMAC.doFinal(s.getBytes("UTF-8"));
//return new String(Base64.encodeBase64String(bytes));
} catch (Exception e) {
System.out.println("Error");
}
return Base64.getEncoder().encodeToString(bytes);
}
private static String hashTime() {
String time = getUTCFormattedDate("yyyy-MM-dd'T'HH:mm:ss'Z'");
return time;
}
private static String getUTCFormattedDate(String format) {
SimpleDateFormat dateFormat = new SimpleDateFormat(format);
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
return dateFormat.format(new Date());
}
public static String excutePost(String urlParameters) throws IOException {
System.out.println(urlParameters);
System.out.println(headerContentType);
System.out.println(MerchantToken);
System.out.println(authorizationHeader);
System.out.println(epoch);
System.out.println(nonce);
URL url = new URL("https://api-cert.payeezy.com/v1/transactions");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
try {
// Create connection
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", headerContentType);
connection.setRequestProperty("apikey ", apikey);
connection.setRequestProperty("token", MerchantToken);
connection.setRequestProperty("Authorization", authorizationHeader);
connection.setRequestProperty("timestamp", "" + epoch);
connection.setRequestProperty("nonce", "" + nonce);
connection.setDoOutput(true);
connection.setReadTimeout(30000);
// Send request
DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();
// Get Response
InputStream is = null;
int statusCode = connection.getResponseCode();
try {
is = connection.getInputStream();
} catch (IOException e) {
if (statusCode >= 400) {
is = connection.getErrorStream();
}
}
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
String line;
StringBuffer response = new StringBuffer();
while ((line = rd.readLine()) != null) {
response.append(line);
response.append('\r');
}
rd.close();
return response.toString();
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
}