随机数

src/main/java/com/flagnote/note/utils/RandomUtils.java

@@ -1,15 +1,21 @@
 package com.flagnote.note.utils;
 
-import java.util.concurrent.ThreadLocalRandom;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
 
 public class RandomUtils {
 
+	public static SecureRandom sr = null;
 	
-	public static ThreadLocalRandom getRandom() {
-		return ThreadLocalRandom.current();
+	static {
+        try {
+            sr = SecureRandom.getInstanceStrong();
+        } catch (NoSuchAlgorithmException e) {
+            sr = new SecureRandom(); 
+        }
 	}
 	
 	public static Integer nextInt(Integer num) {
-		return getRandom().nextInt(num);
+		return sr.nextInt(num);
 	}
 }