完成 RandomTools 单元测试

src/main/java/xyz/zhouxy/plusone/commons/util/RandomTools.java

@@ -16,6 +16,7 @@
 
 package xyz.zhouxy.plusone.commons.util;
 
+import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
 import java.util.Objects;
 import java.util.Random;
@@ -23,14 +24,40 @@ import java.util.concurrent.ThreadLocalRandom;
 
 import javax.annotation.Nonnull;
 
+/**
+ * 随机工具类
+ * <p>
+ * 建议调用方自行维护 Random 对象
+ * </p>
+ * @author <a href="http://zhouxy.xyz:3000/ZhouXY108}">ZhouXY</a>
+ */
 public final class RandomTools {
 
-    public static final SecureRandom DEFAULT_SECURE_RANDOM = new SecureRandom();
+    private static final SecureRandom DEFAULT_SECURE_RANDOM;
+
+    static {
+        SecureRandom secureRandom = null;
+        try {
+            secureRandom = SecureRandom.getInstanceStrong(); // 获取高强度安全随机数生成器
+        }
+        catch (NoSuchAlgorithmException e) {
+            secureRandom = new SecureRandom(); // 获取普通的安全随机数生成器
+        }
+        DEFAULT_SECURE_RANDOM = secureRandom;
+    }
 
     public static final String CAPITAL_LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     public static final String LOWERCASE_LETTERS = "abcdefghijklmnopqrstuvwxyz";
     public static final String NUMBERS = "0123456789";
 
+    public static SecureRandom defaultSecureRandom() {
+        return DEFAULT_SECURE_RANDOM;
+    }
+
+    public static ThreadLocalRandom currentThreadLocalRandom() {
+        return ThreadLocalRandom.current();
+    }
+
     /**
      * 使用传入的随机数生成器，生成指定长度的字符串
      *