查询用户总数进行修改

src/com/hellogithub/dao/UserDao.java

@@ -175,13 +175,15 @@ public class UserDao {
      *
      * 返回用户总数
      * */
-    public int  queryUserCount(){
-        int num;
+    public long  queryUserCount(){
+        userEntity userEntity;
+        long num;
         try {
             Connection conn = JdbcUtils.getConnection();
             QueryRunner runner = new QueryRunner();
-            String sql="select count(*) from user";
-            num = runner.query(conn,sql,new BeanHandler<>(Integer.class));
+            String sql="select count(*) as num from user";
+            userEntity = runner.query(conn,sql,new BeanHandler<>(userEntity.class));
+            num = userEntity.getNum();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }

src/com/hellogithub/entity/userEntity.java

@@ -117,4 +117,13 @@ public class userEntity {
                 ", searchHistory='" + searchHistory + '\'' +
                 '}';
     }
+    long num;
+
+    public long getNum() {
+        return num;
+    }
+
+    public void setNum(long num) {
+        this.num = num;
+    }
 }

src/com/hellogithub/service/UserService.java

@@ -47,5 +47,5 @@ public class UserService {
      * @param name
      * */
     public int  dedleteAllLabel(String name){return userDao.dedleteAllLabel(name);}
-    public int queryUserCount(){return userDao.queryUserCount();}
+    public long queryUserCount(){return userDao.queryUserCount();}
 }

src/com/hellogithub/servlet/userNumServlet.java

@@ -1,9 +1,11 @@
 package com.hellogithub.servlet;
 
 import com.alibaba.fastjson.JSONObject;
+import com.hellogithub.dao.UserDao;
 import com.hellogithub.service.UserService;
 import jakarta.servlet.ServletConfig;
 import jakarta.servlet.ServletException;
+import jakarta.servlet.annotation.WebServlet;
 import jakarta.servlet.http.HttpServlet;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
@@ -11,7 +13,7 @@ import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.HashMap;
-
+@WebServlet("/userNum")
 public class userNumServlet extends HttpServlet {
     private UserService userService = new UserService();
     @Override
@@ -38,7 +40,7 @@ public class userNumServlet extends HttpServlet {
         resp.setContentType("application/json;charset=UTF-8");
 
         PrintWriter writer = resp.getWriter();
-        int num = userService.queryUserCount();
+        long num = userService.queryUserCount();
         String  str= "num:"+num ;
         String jsonString = JSONObject.toJSONString(str);
         writer.println(jsonString);