【Bootstrap4前端框架+MySQL數據庫】前后端綜合實訓【10天課程 博客匯總表 詳細筆記】【附：實訓所有代碼】

目? ?錄

ajax獲取表單標簽內容

ajax根據數據庫加載select下來列表框的options

根據“欄目信息”添加“新聞信息”

news_manager.html

AddNewsServlet.java

新聞管理系統后臺數據（SQL語句）

eclipse導入Web項目代碼報錯解決方案

新聞管理系統——項目展示

“新聞管理”欄目

---

ajax獲取表單標簽內容

ajax根據數據庫加載select下來列表框的options

根據“欄目信息”添加“新聞信息”

報錯信息：Cannot?add?or?update?a?child?row:?a?foreign?key?constraint?fails?(`zykkk`.`news_info`,?CONSTRAINT?`FK_Reference_4`?FOREIGN?KEY?(`item_id`)?REFERENCES?`new_item`?(`item_id`))

news_manager.html

AddNewsServlet.java

package com.newcapec.servlet.news;import java.io.IOException; import java.sql.SQLException; import java.util.HashMap;import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import com.alibaba.fastjson.JSON; import com.newcapec.dao.NewsInfoDao; import com.newcapec.entity.NewsInfoEntity;/*** Servlet implementation class AddNewsServlet*/ @WebServlet(name = "/AddNewsServlet", urlPatterns = "/AddNewsServlet") public class AddNewsServlet extends HttpServlet {private static final long serialVersionUID = 1L;private NewsInfoDao newsInfoDao = new NewsInfoDao();/*** @see HttpServlet#HttpServlet()*/public AddNewsServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse* response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// TODO Auto-generated method stubresponse.getWriter().append("Served at: ").append(request.getContextPath());}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse* response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// TODO Auto-generated method stub// doGet(request, response);request.setCharacterEncoding("utf-8");response.setContentType("text/json;charset=utf-8");String addNewsTitle = request.getParameter("addNewsTitle");String addNewsItem = request.getParameter("addNewsItem"); // 欄目idString addNewsContent = request.getParameter("addNewsContent");NewsInfoEntity newsInfoEntity = new NewsInfoEntity();newsInfoEntity.setNewsTitle(addNewsTitle);newsInfoEntity.setItemId(Integer.parseInt(addNewsItem));newsInfoEntity.setNewsContent(addNewsContent);try {boolean flag = newsInfoDao.insert(newsInfoEntity);HashMap<String, Boolean> result = new HashMap<>();result.put("flag", flag);response.getWriter().write(JSON.toJSONString(result));} catch (ClassNotFoundException | SQLException e) {// TODO 自動生成的 catch 塊e.printStackTrace();}}}

新聞管理系統后臺數據（SQL語句）

/* SQLyog Ultimate v12.08 (64 bit) MySQL - 8.0.20 : Database - zykkk ********************************************************************* *//*!40101 SET NAMES utf8 */;/*!40101 SET SQL_MODE=''*/;/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */; /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */; /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */; /*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */; CREATE DATABASE /*!32312 IF NOT EXISTS*/`zykkk` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_hungarian_ci */ /*!80016 DEFAULT ENCRYPTION='N' */;USE `zykkk`;/*Table structure for table `item_user` */DROP TABLE IF EXISTS `item_user`;CREATE TABLE `item_user` (`item_user_id` int NOT NULL AUTO_INCREMENT,`user_id` int DEFAULT NULL,`item_id` int DEFAULT NULL,`create_time` datetime DEFAULT NULL COMMENT '創建時間',`update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改時間',`status` int DEFAULT '1' COMMENT '1：啟用 0：禁用',PRIMARY KEY (`item_user_id`),KEY `FK_Reference_2` (`user_id`),KEY `FK_Reference_3` (`item_id`),CONSTRAINT `FK_Reference_2` FOREIGN KEY (`user_id`) REFERENCES `user_info` (`user_id`),CONSTRAINT `FK_Reference_3` FOREIGN KEY (`item_id`) REFERENCES `new_item` (`item_id`) ) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_hungarian_ci;/*Data for the table `item_user` */insert into `item_user`(`item_user_id`,`user_id`,`item_id`,`create_time`,`update_time`,`status`) values (1,1,2,'2020-11-23 11:24:16','2020-11-25 10:27:54',1),(2,2,4,NULL,'2020-11-25 09:38:17',1),(3,1,1,'2020-11-24 09:19:58','2020-11-25 09:38:21',1),(5,1,18,NULL,'2020-11-25 09:44:16',1),(6,1,27,'2020-11-25 11:11:35','2020-11-25 11:11:35',1),(7,1,28,'2020-11-25 11:17:59','2020-11-25 11:17:59',1),(8,1,29,'2020-11-25 11:29:14','2020-11-25 11:29:14',1),(9,1,30,'2020-11-25 11:30:54','2020-11-25 11:30:54',1),(10,1,31,'2020-11-25 11:36:51','2020-11-25 11:36:51',1),(11,1,32,'2020-11-25 16:26:23','2020-11-25 16:26:23',1),(12,1,33,'2020-11-25 16:26:37','2020-11-25 16:26:37',1);/*Table structure for table `logs_info` */DROP TABLE IF EXISTS `logs_info`;CREATE TABLE `logs_info` (`logs_id` int NOT NULL AUTO_INCREMENT,`user_id` int DEFAULT NULL,`logs_content` text CHARACTER SET utf8mb4 COLLATE utf8mb4_hungarian_ci,`create_time` datetime DEFAULT NULL COMMENT '創建時間',`update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改時間',PRIMARY KEY (`logs_id`),KEY `FK_Reference_1` (`user_id`),CONSTRAINT `FK_Reference_1` FOREIGN KEY (`user_id`) REFERENCES `user_info` (`user_id`) ) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_hungarian_ci;/*Data for the table `logs_info` */insert into `logs_info`(`logs_id`,`user_id`,`logs_content`,`create_time`,`update_time`) values (1,1,NULL,NULL,'2020-11-24 09:27:05'),(2,2,NULL,NULL,'2020-11-24 09:27:12'),(3,4,NULL,NULL,'2020-11-23 11:29:06'),(14,1,'woshishenren','2020-11-24 09:24:52','2020-11-24 09:24:52'),(15,1,'woshishenren','2020-11-24 09:25:58','2020-11-24 09:25:58');/*Table structure for table `new_item` */DROP TABLE IF EXISTS `new_item`;CREATE TABLE `new_item` (`item_id` int NOT NULL AUTO_INCREMENT,`item_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_hungarian_ci NOT NULL,`create_time` datetime DEFAULT NULL COMMENT '創建時間',`update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改時間',`status` int DEFAULT '1' COMMENT '1：啟用 0：禁用',PRIMARY KEY (`item_id`) ) ENGINE=InnoDB AUTO_INCREMENT=34 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_hungarian_ci;/*Data for the table `new_item` */insert into `new_item`(`item_id`,`item_name`,`create_time`,`update_time`,`status`) values (1,'學生會','2020-11-24 15:47:00','2020-11-25 14:44:37',1),(2,'黨支部','2020-11-24 15:47:03','2020-11-25 14:44:31',0),(3,'分團委','2020-11-24 15:47:05','2020-11-25 14:43:54',1),(4,'院團委','2020-11-24 15:47:08','2020-11-25 14:44:38',1),(5,'111','2020-11-23 15:22:54','2020-11-25 14:45:55',1),(6,'學生會','2020-11-24 09:27:36','2020-11-25 14:46:01',1),(8,'黨支部','2020-11-24 13:51:13','2020-11-25 14:46:07',1),(18,'黨支部','2020-11-25 09:11:51','2020-11-25 15:49:06',1),(19,'院團委','2020-11-25 10:42:54','2020-11-25 14:46:16',1),(20,'111','2020-11-25 10:54:12','2020-11-25 14:46:19',1),(21,'學生會','2020-11-25 10:56:21','2020-11-25 14:46:35',1),(22,'黨支部','2020-11-25 10:57:35','2020-11-25 14:46:43',1),(23,'分團委','2020-11-25 11:00:20','2020-11-25 14:46:48',1),(24,'院團委','2020-11-25 11:00:47','2020-11-25 14:46:55',1),(25,'qweqwe','2020-11-25 11:01:37','2020-11-25 11:01:37',1),(26,'eqweqweqwe','2020-11-25 11:01:53','2020-11-25 11:01:53',1),(27,'分團委','2020-11-25 11:11:35','2020-11-25 15:49:18',1),(28,'sadsads','2020-11-25 11:17:59','2020-11-25 11:18:40',0),(29,'院團委','2020-11-25 11:29:13','2020-11-25 15:49:25',1),(30,'789','2020-11-25 11:30:54','2020-11-25 11:37:19',0),(31,'zyk','2020-11-25 11:36:51','2020-11-25 11:37:19',0),(32,'琨家軍委員會','2020-11-25 16:26:23','2020-11-25 16:26:30',0),(33,'委員會','2020-11-25 16:26:37','2020-11-25 22:42:25',1);/*Table structure for table `news_info` */DROP TABLE IF EXISTS `news_info`;CREATE TABLE `news_info` (`new_id` int NOT NULL AUTO_INCREMENT,`item_id` int DEFAULT NULL,`news_title` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_hungarian_ci NOT NULL,`news_image` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_hungarian_ci DEFAULT NULL,`news_content` text CHARACTER SET utf8mb4 COLLATE utf8mb4_hungarian_ci,`create_time` datetime DEFAULT NULL COMMENT '創建時間',`update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改時間',PRIMARY KEY (`new_id`),KEY `FK_Reference_4` (`item_id`),CONSTRAINT `FK_Reference_4` FOREIGN KEY (`item_id`) REFERENCES `new_item` (`item_id`) ) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_hungarian_ci;/*Data for the table `news_info` */insert into `news_info`(`new_id`,`item_id`,`news_title`,`news_image`,`news_content`,`create_time`,`update_time`) values (1,2,'藍橋杯比賽',NULL,NULL,NULL,'2020-11-23 09:27:39'),(2,3,'新學期學費',NULL,NULL,NULL,'2020-11-23 09:28:10'),(3,1,'拔河比賽',NULL,'拔河比賽要使勁！！！','2020-11-25 14:57:28','2020-11-25 14:57:32'),(4,18,'街舞比賽',NULL,'一起搖擺~','2020-11-25 15:54:09','2020-11-25 15:54:11'),(10,27,'數學建模',NULL,'一起加油！','2020-11-25 16:10:02','2020-11-25 22:17:19'),(11,29,'班班唱',NULL,'《走向復興》','2020-11-25 16:12:23','2020-11-25 16:12:23'),(12,1,'籃球比賽',NULL,'沖沖沖~','2020-11-25 16:13:04','2020-11-25 16:13:04'),(13,1,'大英競賽NECCS',NULL,'沖呀~','2020-11-25 16:27:22','2020-11-25 22:17:45'),(14,18,'卓見杯',NULL,'啦啦啦~','2020-11-25 17:41:32','2020-11-25 22:17:56');/*Table structure for table `user_info` */DROP TABLE IF EXISTS `user_info`;CREATE TABLE `user_info` (`user_id` int NOT NULL AUTO_INCREMENT,`user_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_hungarian_ci NOT NULL,`user_pwd` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_hungarian_ci NOT NULL,`create_time` datetime DEFAULT NULL COMMENT '創建時間',`update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改時間',`status` int DEFAULT '1' COMMENT '1:啟用 0：禁用',PRIMARY KEY (`user_id`) ) ENGINE=InnoDB AUTO_INCREMENT=116 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_hungarian_ci;/*Data for the table `user_info` */insert into `user_info`(`user_id`,`user_name`,`user_pwd`,`create_time`,`update_time`,`status`) values (1,'宋書航','1','2020-11-23 09:30:16','2020-11-25 22:16:25',1),(2,'雨柔子','1','2020-11-23 11:25:41','2020-11-25 22:16:25',1),(4,'王五','1','2020-11-23 11:25:58','2020-11-25 22:16:26',0),(5,'趙柳','1','2020-11-23 11:26:12','2020-11-25 22:16:26',0),(8,'田七','1','2020-11-23 11:26:29','2020-11-25 22:16:27',0),(9,'田七','1','2020-11-23 15:03:23','2020-11-25 22:16:28',0),(10,'田七','1','2020-11-23 15:03:43','2020-11-25 22:16:28',0),(11,'戴沐白','1','2020-11-24 10:45:06','2020-11-25 22:16:29',1),(12,'張小凡','1','2020-11-24 10:45:29','2020-11-25 22:16:29',1),(13,'userName2','1','2020-11-24 10:45:29','2020-11-25 22:16:30',0),(14,'userName3','1','2020-11-24 10:45:29','2020-11-25 22:16:30',0),(15,'碧瑤','1','2020-11-24 10:45:29','2020-11-25 22:16:31',1),(16,'趙戀凡','1','2020-11-24 10:45:29','2020-11-25 22:16:31',1),(17,'李長壽','1','2020-11-24 10:45:29','2020-11-25 22:16:32',1),(18,'藍夢娥','1','2020-11-24 10:45:29','2020-11-25 22:16:33',1),(19,'userName8','1','2020-11-24 10:45:29','2020-11-25 22:16:38',0),(20,'userName9','123456','2020-11-24 10:45:29','2020-11-25 11:36:31',0),(21,'userName10','123456','2020-11-24 10:45:29','2020-11-25 11:36:36',0),(22,'路明非','123456','2020-11-24 10:45:29','2020-11-25 17:44:31',1),(23,'楚子航','123456','2020-11-24 10:45:29','2020-11-25 22:14:26',1),(24,'userName13','123456','2020-11-24 10:45:29','2020-11-24 10:45:29',1),(25,'userName14','123456','2020-11-24 10:45:29','2020-11-24 10:45:29',1),(26,'userName15','123456','2020-11-24 10:45:29','2020-11-25 23:03:54',0),(27,'userName16','123456','2020-11-24 10:45:29','2020-11-25 23:03:54',0),(28,'userName17','123456','2020-11-24 10:45:29','2020-11-25 23:03:54',0),(29,'userName18','123456','2020-11-24 10:45:29','2020-11-25 23:03:54',0),(30,'userName19','123456','2020-11-24 10:45:29','2020-11-25 23:03:54',0),(31,'userName20','123456','2020-11-24 10:45:29','2020-11-25 23:03:54',0),(32,'userName21','123456','2020-11-24 10:45:29','2020-11-24 10:45:29',1),(33,'喬微尼','123456','2020-11-24 10:45:29','2020-11-25 23:05:48',1),(35,'userName24','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(36,'userName25','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(37,'userName26','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(38,'userName27','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(39,'userName28','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(40,'userName29','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(41,'userName30','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(42,'userName31','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(43,'userName32','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(44,'userName33','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(45,'userName34','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(46,'userName35','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(47,'userName36','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(48,'userName37','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(49,'userName38','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(50,'userName39','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(51,'userName40','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(52,'userName41','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(53,'userName42','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(54,'userName43','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(55,'userName44','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(56,'userName45','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(57,'userName46','123456','2020-11-24 10:45:30','2020-11-24 10:45:30',1),(58,'userName47','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(59,'userName48','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(60,'userName49','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(61,'userName50','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(62,'userName51','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(63,'userName52','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(64,'userName53','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(65,'userName54','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(66,'userName55','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(67,'userName56','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(68,'userName57','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(69,'userName58','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(70,'userName59','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(71,'userName60','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(72,'userName61','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(73,'userName62','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(74,'userName63','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(75,'userName64','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(76,'userName65','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(77,'userName66','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(78,'userName67','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(79,'userName68','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(80,'userName69','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(81,'userName70','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(82,'userName71','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(83,'userName72','123456','2020-11-24 10:45:31','2020-11-24 10:45:31',1),(84,'userName73','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(85,'userName74','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(86,'userName75','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(87,'userName76','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(88,'userName77','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(89,'userName78','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(90,'userName79','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(91,'userName80','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(92,'userName81','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(93,'userName82','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(94,'userName83','123456','2020-11-24 10:45:32','2020-11-24 10:45:32',1),(95,'userName84','123456','2020-11-24 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10:45:32',1),(109,'userName98','123456','2020-11-24 10:45:32','2020-11-25 10:12:58',0),(110,'userName99','123456','2020-11-24 10:45:32','2020-11-25 10:12:58',0),(111,'userName100','123456','2020-11-24 10:45:33','2020-11-25 10:12:58',0),(115,'蕭潛','1','2020-11-25 23:00:16','2020-11-25 23:00:16',1);/*!40101 SET SQL_MODE=@OLD_SQL_MODE */; /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */; /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */; /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

eclipse導入Web項目代碼報錯解決方案

原文鏈接

? ?

新聞管理系統——項目展示

“新聞管理”欄目

在周老師的指導、zyk同學的幫助下，完成的。啊哈哈、

總結

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