From 72c015801faf1b0d14a430a29ac624099a916893 Mon Sep 17 00:00:00 2001
From: User_cyk <1020691186@qq.com>
Date: Sun, 9 Jul 2023 14:03:58 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=94=B9=E8=BF=94=E5=9B=9E=E6=A0=87?=
 =?UTF-8?q?=E7=AD=BE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/com/hellogithub/servlet/retLabelServlet.java | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/com/hellogithub/servlet/retLabelServlet.java b/src/com/hellogithub/servlet/retLabelServlet.java
index dcf5223..d9386ef 100644
--- a/src/com/hellogithub/servlet/retLabelServlet.java
+++ b/src/com/hellogithub/servlet/retLabelServlet.java
@@ -38,8 +38,14 @@ public class retLabelServlet extends HttpServlet {
         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");
         PrintWriter writer = resp.getWriter();
-        String jsonString = JSONObject.toJSONString(categoryService.retLabel());
-        writer.println(jsonString);
+        if(categoryService.retLabel().size() !=0)
+        {
+            String jsonString = JSONObject.toJSONString(categoryService.retLabel());
+            writer.println(jsonString);
+        }
+        else{
+            writer.println("null");
+        }
         writer.close();
     }
     public void setResult(Integer code, String msg, PrintWriter writer) {