根据标签查询最新的项目和最热门的项目，默认标签为0时查询全部项目。

src/com/hellogithub/dao/UserDao.java

@@ -4,6 +4,7 @@ import com.hellogithub.entity.userEntity;
 import com.hellogithub.utils.JdbcUtils;
 import org.apache.commons.dbutils.QueryRunner;
 import org.apache.commons.dbutils.handlers.BeanHandler;
+import org.apache.commons.dbutils.handlers.ScalarHandler;
 
 import java.sql.*;
 
@@ -170,4 +171,19 @@ public class UserDao {
 
         return num;
     }
+
+    public Long retUserNum(){
+        Long count;
+        try {
+            Connection conn = JdbcUtils.getConnection();
+            ScalarHandler handler=new ScalarHandler<Integer>();
+            QueryRunner runner = new QueryRunner();
+            String sql = "select count(*) from user";
+            count =(Long) runner.query( conn,sql,new ScalarHandler());
+            conn.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return count;
+    }
 }

src/com/hellogithub/dao/projectDao.java

@@ -5,8 +5,11 @@ import com.hellogithub.utils.JdbcUtils;
 import org.apache.commons.dbutils.QueryRunner;
 import org.apache.commons.dbutils.handlers.BeanHandler;
 import org.apache.commons.dbutils.handlers.BeanListHandler;
+import org.apache.commons.dbutils.handlers.ScalarHandler;
 
+import java.lang.ref.PhantomReference;
 import java.sql.Connection;
+import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.List;
 
@@ -59,7 +62,7 @@ public class projectDao {
         try {
             Connection conn = JdbcUtils.getConnection();
             QueryRunner runner = new QueryRunner();
-            String sql = "select count(1) from project";
+            String sql = "select count(*) from project";
             count  = runner.query(conn, sql, new BeanHandler<>(Integer.class));
             conn.close();
         } catch (SQLException e) {
@@ -98,6 +101,11 @@ public class projectDao {
         }
         return projectEntityList;
     }
+    /**
+     * 按照分类检索项目
+     *
+     *
+     */
     public List<projectEntity> retSelcetByCate(int cateid){
         List<projectEntity> projectEntityList;
         try {
@@ -110,7 +118,11 @@ public class projectDao {
         }
         return projectEntityList;
     }
-
+    /**
+     * 按照分类检索最热门项目
+     *
+     *
+     */
     public List<projectEntity> retSelcetByStartNum(int cateid){
         List<projectEntity> projectEntityList;
         try {
@@ -123,6 +135,11 @@ public class projectDao {
         }
         return projectEntityList;
     }
+    /**
+     * 检索所有最热门的项目
+     *
+     *
+     */
     public List<projectEntity> retMostStar(){
         List<projectEntity> projectEntityList;
         try {
@@ -136,4 +153,7 @@ public class projectDao {
         return projectEntityList;
     }
 
+
+
+
 }

src/com/hellogithub/service/UserService.java

@@ -47,4 +47,10 @@ public class UserService {
      * @param name
      * */
     public int  dedleteAllLabel(String name){return userDao.dedleteAllLabel(name);}
+    /**
+     * 查询用户表中的用户总数
+     * */
+    public Long retUserNums(){return userDao.retUserNum();}
+
+
 }

src/com/hellogithub/service/projectService.java

@@ -4,10 +4,8 @@ import com.hellogithub.dao.UserDao;
 import com.hellogithub.dao.projectDao;
 import com.hellogithub.entity.projectEntity;
 
-import java.util.HashMap;
+import java.sql.Array;
-import java.util.Iterator;
+import java.util.*;
-import java.util.List;
-import java.util.Map;
 
 public class projectService {
 
@@ -109,6 +107,9 @@ public class projectService {
         }
         return projectEntityList;
     }
+    /**
+     * 返回根据标签查询最热门的项目
+     * */
     public List<projectEntity> retSelcetByStar(int cate){
         if (cate==0){
             return projectDao.retMostStar();
@@ -118,4 +119,5 @@ public class projectService {
     }
 
 
+
 }

src/com/hellogithub/servlet/selectMostStarServlet.java

@@ -11,7 +11,11 @@ import jakarta.servlet.http.HttpServletResponse;
 
 import java.io.IOException;
 import java.io.PrintWriter;
-
+/**
+ * 根据标签查询最热门的项目
+ *
+ *
+ */
 @WebServlet("/selectMostStar")
 public class selectMostStarServlet extends HttpServlet {
     private projectService projectService=new projectService();
@@ -38,7 +42,7 @@ public class selectMostStarServlet 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");
 
-        String cate = req.getParameter("xxxxxxx");
+        String cate = req.getParameter("cate");
         PrintWriter writer = resp.getWriter();
         String jsonString = JSONObject.toJSONString(projectService.retSelcetByStar(Integer.valueOf(cate)));
         writer.println(jsonString);

src/com/hellogithub/servlet/userNumServlet.java

@@ -0,0 +1,55 @@
+package com.hellogithub.servlet;
+
+import com.alibaba.fastjson.JSONObject;
+import com.hellogithub.dao.UserDao;
+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;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+/**
+ * 返回数据库中用户的总人数
+ * */
+@WebServlet("/userNum")
+public class userNumServlet extends HttpServlet {
+    UserDao userDao = new UserDao();
+    @Override
+    public void init(ServletConfig config) throws ServletException {
+        super.init(config);
+    }
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+
+        doPost(req,resp);
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        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");
+
+        PrintWriter writer = resp.getWriter();
+        String  str= "num:"+ userDao.retUserNum();
+        String jsonString = JSONObject.toJSONString(str);
+        writer.println(jsonString);
+        writer.close();
+    }
+
+    @Override
+    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.service(req, resp);
+    }
+}