解决null值转换为字符串 "null"问题

ems-common/src/main/java/com/xzzn/common/utils/StringUtils.java

@@ -1,5 +1,8 @@
 package com.xzzn.common.utils;
 
+import com.xzzn.common.constant.Constants;
+import com.xzzn.common.core.text.StrFormatter;
+
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -7,9 +10,8 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+
 import org.springframework.util.AntPathMatcher;
-import com.xzzn.common.constant.Constants;
-import com.xzzn.common.core.text.StrFormatter;
 
 /**
  * 字符串工具类
@@ -743,6 +745,7 @@ public class StringUtils extends org.apache.commons.lang3.StringUtils
     }
 
     public static String getString(Object s){
+        if (s == null) return null;
         String result;
         try {
             result = String.valueOf(s);