bug fix

src/main/java/com/huiju/estateagents/common/SMSUtils.java

     // 短信服务配置
     SMSProperties smsProperties;
 
-    Map<String, Phone> allPhones;
+    Hashtable<String, Phone> allPhones;
 
     @Autowired
     public SMSUtils(SMSProperties properties) {
         smsProperties = properties;
-        allPhones = new HashMap<>();
+        allPhones = new Hashtable<>();
     }
 
     /**