使用单例枚举保证流水号工具类为全局单例

renren-admin/src/main/java/io/renren/common/utils/CodeGenerationUtils.java

@@ -25,6 +25,23 @@ public class CodeGenerationUtils {
     }
 
 
+    /**
+     * 使用单例枚举保证全局单例
+     */
+    enum CodeGenerationUtilsEnum {
+        INSTANCE;
+        private CodeGenerationUtils codeGenerationUtils;
+
+        CodeGenerationUtilsEnum() {
+            codeGenerationUtils = new CodeGenerationUtils();
+        }
+
+        public CodeGenerationUtils getInstnce() {
+            return codeGenerationUtils;
+        }
+    }
+
+
     /**
      * 生成流程单号
      * <p>
@@ -89,9 +106,7 @@ public class CodeGenerationUtils {
 
     }
 
-    private static CodeGenerationUtils codeGenerationUtils = new CodeGenerationUtils();
-
     public static CodeGenerationUtils getInstance() {
-        return codeGenerationUtils;
+        return CodeGenerationUtilsEnum.INSTANCE.getInstnce();
     }
 }