diff --git a/src/com/hellogithub/servlet/retUserAvServlet.java b/src/com/hellogithub/servlet/retUserAvServlet.java
index 328b522..54f0aa4 100644
--- a/src/com/hellogithub/servlet/retUserAvServlet.java
+++ b/src/com/hellogithub/servlet/retUserAvServlet.java
@@ -31,14 +31,16 @@ public class retUserAvServlet extends HttpServlet {
     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 
 
-        HttpSession session = req.getSession();
+        String username = req.getParameter("username");
         userEntity userEntity= null;
-        userEntity=(userEntity)session.getAttribute("user");
+        userEntity=userService.selectUserByName(username);
         if(userEntity != null)
         {
-            userEntity = userService.selectUserByName(userEntity.getUserName());
-            FileInputStream  fis = new FileInputStream (userEntity.getUserAvatar());
-            String type = userEntity.getUserAvatar().substring(userEntity.getUserAvatar().lastIndexOf(".")+1);
+            String uri = userEntity.getUserAvatar();
+            if(!uri.startsWith("https"))
+            {
+                FileInputStream  fis = new FileInputStream (uri);
+                String type = userEntity.getUserAvatar().substring(userEntity.getUserAvatar().lastIndexOf(".")+1);
 
                 int size = fis.available();
                 if(size != 0)
@@ -53,19 +55,37 @@ public class retUserAvServlet extends HttpServlet {
                     os.flush();
                     os.close();
                 }
+            }else{
+                PrintWriter writer = resp.getWriter();
+                resp.setCharacterEncoding("UTF-8");
+                resp.setContentType("text/html; charset=utf-8");
+                //        设置响应头允许ajax跨域访问
+                String curOrigin = req.getHeader("Origin");
+                resp.setHeader("Access-Control-Allow-Origin", curOrigin == null ? "true" : curOrigin);
+                resp.setHeader("Access-Control-Allow-Credentials", "true");
+                resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
+                resp.setHeader("Access-Control-Max-Age", "3600");
+                resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
+                resp.setContentType("application/json;charset=UTF-8");
+                writer.println(uri);
+                writer.close();
+            }
 
 
-
-
-//            resp.setContentType("image/jpeg");
-//            resp.setCharacterEncoding("UTF-8");
-//            //        设置响应头允许ajax跨域访问
-//            String curOrigin = req.getHeader("Origin");
-//            resp.setHeader("Access-Control-Allow-Origin", curOrigin == null ? "true" : curOrigin);
-//            resp.setHeader("Access-Control-Allow-Credentials", "true");
-//            resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
-//            resp.setHeader("Access-Control-Max-Age", "3600");
-//            resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
+        }else{
+            PrintWriter writer = resp.getWriter();
+            resp.setCharacterEncoding("UTF-8");
+            resp.setContentType("text/html; charset=utf-8");
+            //        设置响应头允许ajax跨域访问
+            String curOrigin = req.getHeader("Origin");
+            resp.setHeader("Access-Control-Allow-Origin", curOrigin == null ? "true" : curOrigin);
+            resp.setHeader("Access-Control-Allow-Credentials", "true");
+            resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
+            resp.setHeader("Access-Control-Max-Age", "3600");
+            resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
+            resp.setContentType("application/json;charset=UTF-8");
+            writer.println("不存在该用户");
+            writer.close();
         }