diff --git a/src/com/hellogithub/servlet/retUserServlet.java b/src/com/hellogithub/servlet/retUserServlet.java
index 92c1878..877dbdb 100644
--- a/src/com/hellogithub/servlet/retUserServlet.java
+++ b/src/com/hellogithub/servlet/retUserServlet.java
@@ -42,7 +42,8 @@ public class retUserServlet extends HttpServlet {
 
         PrintWriter writer = resp.getWriter();
         String username = req.getParameter("username");
-        String jsonString = JSONObject.toJSONString(userService.selectUserByName(username));
+        String jsonString="";
+        jsonString = JSONObject.toJSONString(userService.selectUserByName(username));
         if(jsonString.equals(""))
         {
             setResultError("查询失败",writer);