随机字符串生成算法

haoban-manage3-service/src/main/java/com/gic/haoban/manage/service/service/out/impl/licence/AppOrderApiServiceImpl.java

@@ -140,7 +140,7 @@ public class AppOrderApiServiceImpl implements AppOrderApiService {
         long timeStamp = System.currentTimeMillis() / 1000;
         //签名算法
         SignatureGetterUtil signatureGetterUtil = new SignatureGetterUtil(secret);
-        String nonceStr = signatureGetterUtil.genNonce();
+        String nonceStr = signatureGetterUtil.generateRandomString(12);
         String sig = null;
         map2.put("order_type", qdto.getOrderType());
         map2.put("case_id", promotionCaseId);
@@ -201,7 +201,7 @@ public class AppOrderApiServiceImpl implements AppOrderApiService {
         long timeStamp = System.currentTimeMillis() / 1000;
         //签名算法
         SignatureGetterUtil signatureGetterUtil = new SignatureGetterUtil(secret);
-        String nonceStr = signatureGetterUtil.genNonce();
+        String nonceStr = signatureGetterUtil.generateRandomString(12);
         String sig = null;
         JSONObject json = new JSONObject();
         json.put("order_id", appOrder.getOrderId());

haoban-manage3-service/src/main/java/com/gic/haoban/manage/service/util/SignatureGetterUtil.java

@@ -5,6 +5,7 @@ import com.alibaba.fastjson.JSONObject;
 import javax.crypto.Mac;
 import javax.crypto.spec.SecretKeySpec;
 import java.nio.charset.StandardCharsets;
+import java.security.SecureRandom;
 import java.util.*;
 
 public class SignatureGetterUtil {
@@ -61,17 +62,16 @@ public class SignatureGetterUtil {
      *
      * @return 随机字符串
      */
-    public String genNonce() {
-        return bytesToHex(Long.toString(System.nanoTime()).getBytes(StandardCharsets.UTF_8));
-    }
-    private String bytesToHex(final byte[] hash) {
-        Formatter formatter = new Formatter();
-        for (byte b : hash) {
-            formatter.format("%02x", b);
+    private static final String CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+    public static String generateRandomString(int length) {
+        SecureRandom random = new SecureRandom();
+        StringBuilder sb = new StringBuilder(length);
+        for (int i = 0; i < length; i++) {
+            int randomIndex = random.nextInt(CHARACTERS.length());
+            char randomChar = CHARACTERS.charAt(randomIndex);
+            sb.append(randomChar);
         }
-        String result = formatter.toString();
-        formatter.close();
-        return result;
+        return sb.toString();
     }
 
 }