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/projectDao.java

@@ -66,4 +66,54 @@ public class projectDao {
         }
         return projectEntityList;
     }
+    public List<projectEntity> retLatestProject(){
+        List<projectEntity> projectEntityList;
+        try {
+            Connection conn = JdbcUtils.getConnection();
+            QueryRunner runner = new QueryRunner();
+            String sql = "select * from project ";
+            projectEntityList = runner.query(conn, sql, new BeanListHandler<>(projectEntity.class));
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return projectEntityList;
+    }
+    public List<projectEntity> retSelcetByCate(int cateid){
+        List<projectEntity> projectEntityList;
+        try {
+            Connection conn = JdbcUtils.getConnection();
+            QueryRunner runner = new QueryRunner();
+            String sql = "select * from project where projectId in (select projectId from project_category where categoryId=?)";
+            projectEntityList = runner.query(conn, sql, new BeanListHandler<>(projectEntity.class),cateid);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return projectEntityList;
+    }
+
+    public List<projectEntity> retSelcetByStartNum(int cateid){
+        List<projectEntity> projectEntityList;
+        try {
+            Connection conn = JdbcUtils.getConnection();
+            QueryRunner runner = new QueryRunner();
+            String sql = "select * from project where projectId in (select projectId from project_category where categoryId=?) order by startNum";
+            projectEntityList = runner.query(conn, sql, new BeanListHandler<>(projectEntity.class),cateid);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return projectEntityList;
+    }
+    public List<projectEntity> retMostStar(){
+        List<projectEntity> projectEntityList;
+        try {
+            Connection conn = JdbcUtils.getConnection();
+            QueryRunner runner = new QueryRunner();
+            String sql = "select * from project order by startNum desc";
+            projectEntityList = runner.query(conn, sql, new BeanListHandler<>(projectEntity.class));
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return projectEntityList;
+    }
+
 }

src/com/hellogithub/service/projectService.java

@@ -7,10 +7,37 @@ import com.hellogithub.entity.projectEntity;
 import java.util.List;
 
 public class projectService {
-    private projectDao projectDao=new projectDao();
+    private projectDao projectDao = new projectDao();
 
-    public List<projectEntity> retTerm(String num){return projectDao.retTerm(num);}
-    public int latestNum() {return projectDao.latestNum();}
-    public int countAll() {return projectDao.countAll();}
-    public List<projectEntity> retCate(int num){return projectDao.retCate(num);}
-}
+    public List<projectEntity> retTerm(String num) {
+        return projectDao.retTerm(num);
+    }
+
+    public int latestNum() {
+        return projectDao.latestNum();
+    }
+
+    public int countAll() {
+        return projectDao.countAll();
+    }
+
+    public List<projectEntity> retCate(int num) {
+        return projectDao.retCate(num);
+    }
+
+    public List<projectEntity> retLatestProject(int cate) {
+        if (cate == 0) {
+            return projectDao.retLatestProject();
+        } else {
+            return projectDao.retSelcetByCate(cate);
+        }}
+    public List<projectEntity> retSelcetByStar(int cate){
+        if (cate==0){
+            return projectDao.retMostStar();
+        }else {
+            return projectDao.retSelcetByStartNum(cate);
+        }
+    }
+
+
+}

src/com/hellogithub/servlet/latestServlet.java

@@ -43,3 +43,4 @@ public class latestServlet extends HttpServlet {
         writer.close();
     }
 }
+

src/com/hellogithub/servlet/selectLastByCateServlet.java

@@ -0,0 +1,56 @@
+package com.hellogithub.servlet;
+
+import com.alibaba.fastjson.JSONObject;
+import com.hellogithub.service.projectService;
+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;
+/**
+ * 根据标签查询最新的项目，默认标签值为0的时候查询全部。
+ */
+
+@WebServlet("/selectLastByCate")
+public class selectLastByCateServlet extends HttpServlet {
+    private projectService projectService=new projectService();
+    @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");
+
+        String cate = req.getParameter("xxxxxxx");
+        PrintWriter writer = resp.getWriter();
+        String jsonString = JSONObject.toJSONString(projectService.retLatestProject(Integer.valueOf(cate)));
+        writer.println(jsonString);
+        writer.close();
+    }
+
+    @Override
+    public void destroy() {
+        super.destroy();
+    }
+}

src/com/hellogithub/servlet/selectMostStarServlet.java

@@ -0,0 +1,52 @@
+package com.hellogithub.servlet;
+
+import com.alibaba.fastjson.JSONObject;
+import com.hellogithub.service.projectService;
+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;
+
+@WebServlet("/selectMostStar")
+public class selectMostStarServlet extends HttpServlet {
+    private projectService projectService=new projectService();
+    @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");
+
+        String cate = req.getParameter("xxxxxxx");
+        PrintWriter writer = resp.getWriter();
+        String jsonString = JSONObject.toJSONString(projectService.retSelcetByStar(Integer.valueOf(cate)));
+        writer.println(jsonString);
+        writer.close();
+    }
+
+    @Override
+    public void destroy() {
+        super.destroy();
+    }
+}