更新

src/com/hellogithub/service/UserService.java

@@ -45,8 +45,16 @@ public class UserService {
      * @param name
      * */
     public List<String> selectLabel(String name){
-        String []stringList;
-        stringList=userDao.selectLabel(name).split(";");
+        String [] stringList;
+        String label = userDao.selectLabel(name);
+        if(label == null )
+        {
+            stringList="无搜索历史".split(";");
+        }
+        else{
+            stringList=userDao.selectLabel(name).split(";");
+        }
+
         return Arrays.asList(stringList);
     }
     /**

src/com/hellogithub/servlet/selectUserLabelServlet.java

@@ -10,6 +10,8 @@ import jakarta.servlet.http.*;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.HashMap;
+import java.util.List;
+
 @WebServlet("/selectUserLabel")
 public class selectUserLabelServlet extends HttpServlet {
     private UserService userService = new UserService();
@@ -35,14 +37,22 @@ public class selectUserLabelServlet extends HttpServlet {
         PrintWriter writer = resp.getWriter();
         HttpSession session = req.getSession();
         userEntity userEntity=(userEntity)session.getAttribute("user");
+        String jsonString = null;
         if(userEntity == null){
             setResultError("用户暂未登录", writer);
         }else{
             String name = userEntity.getUserName();
-            String jsonString = JSONObject.toJSONString(userService.selectLabel(name));
-            writer.println(jsonString);
+            List<String> stringList = userService.selectLabel(name);
+            if(stringList.get(0).equals("无搜索历史")){
+                writer.println(jsonString);
+            }
+            else{
+                jsonString = JSONObject.toJSONString(stringList);
+                writer.println(jsonString);
+            }
+
         }
-//        setResultOK("success",writer);
+
         writer.close();
 
     }

src/com/hellogithub/servlet/userDetailServlet.java

@@ -60,6 +60,7 @@ public class userDetailServlet extends HttpServlet {
             dataMap.put("project",projectService.retProjectByUserId(id));
             jsonString = JSONObject.toJSONString(dataMap);
             writer.println(jsonString);
+            writer.close();
         }
     }