显示所有评论，修改userEntity字段类型

src/com/hellogithub/dao/UserDao.java

@@ -250,4 +250,21 @@ public class UserDao {
 
         return num;
     }
+
+    public String selectNameById(int id)
+    {
+        String label;
+        userEntity userEntity;
+        try {
+            Connection conn = JdbcUtils.getConnection();
+            QueryRunner runner = new QueryRunner();
+            String sql = "select * from user where userId=? and isValid = 1";
+            userEntity  = runner.query(conn, sql, new BeanHandler<>(userEntity.class),id);
+            label = userEntity.getUserName();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+        return label;
+    }
 }

src/com/hellogithub/dao/commentDao.java

@@ -0,0 +1,29 @@
+package com.hellogithub.dao;
+
+import com.hellogithub.entity.categoryEntity;
+import com.hellogithub.entity.commentEntity;
+import com.hellogithub.utils.JdbcUtils;
+import org.apache.commons.dbutils.QueryRunner;
+import org.apache.commons.dbutils.handlers.BeanListHandler;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.List;
+
+public class commentDao {
+
+    //显示评论
+    public List<commentEntity> selectByProjectId(String id){
+        List<commentEntity> commentEntityList ;
+        try {
+            Connection conn = JdbcUtils.getConnection();
+            QueryRunner runner = new QueryRunner();
+            String sql = "select * from comment where projectId = ? and isValid = 1";
+            commentEntityList = runner.query(conn, sql,new BeanListHandler<>(commentEntity.class),id);
+            conn.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return commentEntityList;
+    }
+}

src/com/hellogithub/entity/commentEntity.java

@@ -1,6 +1,5 @@
 package com.hellogithub.entity;
 
-import java.util.Date;
 
 public class commentEntity {
     int commentId;
@@ -8,7 +7,7 @@ public class commentEntity {
     int projectId;
     String content;
     int isUsed;
-    Date commentTime;
+    String commentTime;
     int isValid;
 
     public int getCommentId() {
@@ -51,11 +50,11 @@ public class commentEntity {
         this.isUsed = isUsed;
     }
 
-    public Date getCommentTime() {
+    public String getCommentTime() {
         return commentTime;
     }
 
-    public void setCommentTime(Date commentTime) {
+    public void setCommentTime(String commentTime) {
         this.commentTime = commentTime;
     }
 
@@ -66,4 +65,14 @@ public class commentEntity {
     public void setIsValid(int isValid) {
         this.isValid = isValid;
     }
+
+    int star;
+
+    public int getStar() {
+        return star;
+    }
+
+    public void setStar(int star) {
+        this.star = star;
+    }
 }

src/com/hellogithub/entity/userEntity.java

@@ -22,7 +22,7 @@ public class userEntity {
     private String userName;
     private String userPassword;
 
-    private Date creatTime;
+    private String creatTime;
 
     private Integer isValid;
 
@@ -41,7 +41,7 @@ public class userEntity {
         this.userPassword = userPassword;
     }
 
-    public userEntity(Integer userId, String userName, String userPassword, Date creatTime, Integer isValid, Integer projectNum, String searchHistory, Integer contributionValue) {
+    public userEntity(Integer userId, String userName, String userPassword, String creatTime, Integer isValid, Integer projectNum, String searchHistory, Integer contributionValue) {
         this.userId = userId;
         this.userName = userName;
         this.userPassword = userPassword;
@@ -76,11 +76,11 @@ public class userEntity {
         this.userPassword = userPassword;
     }
 
-    public Date getCreatTime() {
+    public String getCreatTime() {
         return creatTime;
     }
 
-    public void setCreatTime(Date creatTime) {
+    public void setCreatTime(String creatTime) {
         this.creatTime = creatTime;
     }
 

src/com/hellogithub/service/commentService.java

@@ -0,0 +1,39 @@
+package com.hellogithub.service;
+
+import com.alibaba.fastjson.JSONArray;
+import com.alibaba.fastjson.JSONObject;
+import com.hellogithub.dao.UserDao;
+import com.hellogithub.dao.commentDao;
+import com.hellogithub.entity.commentEntity;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class commentService {
+    private commentDao commentDao =new commentDao();
+    private UserDao userDao = new UserDao();
+    //显示所有评论
+    public String selectByProjectId(String id){
+        List<commentEntity> commentEntityList;
+        Map<String,String> dataMap = new HashMap<>();
+        Map<String,Map<String,String>> dataMap2 = new HashMap<>();
+        commentEntityList = commentDao.selectByProjectId(id);
+        for(int i=0;i<commentEntityList.size();i++)
+        {
+            commentEntity commentEntity = commentEntityList.get(i);
+            dataMap = new HashMap<>();
+            int userid = commentEntity.getUserId();
+            String username = userDao.selectNameById(userid);
+            String time = commentEntity.getCommentTime();
+            String content = commentEntity.getContent();
+            int star  = commentEntity.getStar();
+            dataMap.put("username",username);
+            dataMap.put("time",time);
+            dataMap.put("content",content);
+            dataMap.put("star",String.valueOf(star));
+            dataMap2.put(String.valueOf(i),dataMap);
+        }
+        return JSONArray.toJSONString(dataMap2);
+    }
+}

src/com/hellogithub/servlet/selectCommentByProServlet.java

@@ -0,0 +1,63 @@
+package com.hellogithub.servlet;
+
+import com.alibaba.fastjson.JSONObject;
+import com.hellogithub.service.commentService;
+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;
+import java.util.HashMap;
+
+@WebServlet("/selectCommentByPro")
+public class selectCommentByProServlet extends HttpServlet {
+    private commentService commentService = new commentService();
+    @Override
+    public void init(ServletConfig config) throws ServletException {
+
+    }
+
+    @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");
+        //按照分类检索
+        String id = req.getParameter("id");
+        PrintWriter writer = resp.getWriter();
+        writer.println(commentService.selectByProjectId(id));
+        writer.close();
+    }
+    public void setResult(Integer code, String msg, PrintWriter writer) {
+        HashMap<String, Object> result = new HashMap<>();
+        result.put("code", code);
+        result.put("msg", msg);
+        String jsonString = JSONObject.toJSONString(result);
+        writer.println(jsonString);
+        writer.close();
+    }
+
+    public void setResultError(String msg, PrintWriter writer) {
+        setResult(500, msg, writer);
+    }
+
+    public void setResultOK(String msg, PrintWriter writer) {
+        setResult(200, msg, writer);
+    }
+}