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记事本做网站的代码百度seo优化工具

wzjs 2025/7/18 22:51:34
记事本做网站的代码,百度seo优化工具,网站开发描述,湖南省交通建设质监局网站目录 一、设计阶段 1.设计ER图 2.创建数据库表 二、项目环境搭建 1.创建项目 2.在pom.xml中添加依赖 3.配置数据库连接 4.状态码的封装 5.开发自定义异常 6.密码加密 7.规范时间格式展示 8.添加Guava本地缓存 9.JWT 三、构建项目开发 1.创建项目结构 2.开发实…

    目录

    一、设计阶段

    1.设计ER图

    2.创建数据库表 

    二、项目环境搭建

    1.创建项目

    2.在pom.xml中添加依赖

    3.配置数据库连接

    4.状态码的封装

    5.开发自定义异常

     6.密码加密

    7.规范时间格式展示

    8.添加Guava本地缓存 

    9.JWT

    三、构建项目开发

    1.创建项目结构

    2.开发实体层和dao层(mapper层)

    生成实体层和dao层

    调整后的项目结构 

    具体讲解

     3.开发controller层

    4.开发service层

    5.配置启动类

    6.用postman进行测试

    一、设计阶段

    1.设计ER图

    • 实体对象：矩形
    • 属性：椭圆
    • 关系：菱形

    2.创建数据库表 

    DROP DATABASE IF EXISTS online_education ;
CREATE DATABASE online_education CHARACTER SET utf8;
use online_education ;
SET FOREIGN_KEY_CHECKS=0;DROP TABLE IF EXISTS `chapter`;CREATE TABLE `chapter` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`video_id` int(11) DEFAULT NULL COMMENT '视频主键',`title` varchar(128) DEFAULT NULL COMMENT '章节名称',`ordered` int(11) DEFAULT NULL COMMENT '章节顺序',`create_time` datetime DEFAULT NULL COMMENT '创建时间',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;INSERT INTO `chapter` (`id`, `video_id`, `title`, `ordered`, `create_time`)
VALUES(370,40,'走进微信⼩小程序的世界',1,'2019-09-05 22:39:59'),(371,40,'开始第一个小程序之旅',2,'2019-09-05 22:39:59'),(372,40,'核⼼知识数据绑定与事件交互',3,'2019-09-05 22:39:59'),(373,40,'⼩程序基础组件及常⽤组件介绍',4,'2019-09-05 22:39:59'),(374,40,'常⽤视图容器及路由跳转',5,'2019-09-05 22:39:59'),(375,40,'构建模板化与模块化小程序',6,'2019-09-05 22:39:59'),(385,41,'搜索引擎之elasticsearch课程介绍',1,'2019-09-05 22:39:59'),(386,41,'你了解搜索引擎吗',2,'2019-09-05 22:39:59'),(387,41,'搜索引擎之elasticsearch的快速搭建',3,'2019-09-05 22:39:59'),(388,41,'搜索引擎之elastic search的快速⼊⻔',4,'2019-09-05 22:39:59'),(389,41,'玩转elastic search的搜索',5,'2019-09-05 22:39:59'),(390,41,'搜索引擎之elastic search的⾼级使⽤',6,'2019-09-05 22:39:59'),(391,41,'仿NBA中国官网之高级实战',7,'2019-09-05 22:39:59'),(392,41,'走入高可用分布式集群世界',8,'2019-09-05 22:39:59'),(393,41,'深入挖掘elasticsearch的原理',9,'2019-09-05 22:39:59'),(394,41,'elasticsearch的课程总结',10,'2019-09-05 22:39:59'),(395,40,'开始电影资讯小程序实战',7,'2019-09-05 22:39:59'),(396,40,'搜索页面及查询更多的实现',8,'2019-09-05 22:39:59'),(397,40,'电影详情页面构建',9,'2019-09-05 22:39:59'),(398,40,'组件化开发',10,'2019-09-05 22:39:59'),(399,40,'Weui组件库',11,'2019-09-05 22:39:59'),(400,40,'扩展内容之小程序常用api',12,'2019-09-05 22:39:59'),(401,40,'课程总结',13,'2019-09-05 22:39:59'),(450,42,'课程介绍',1,'2019-09-05 22:39:59'),(451,42,'Vue全家桶各部分核⼼知识详解',2,'2019-09-05 22:39:59'),(452,42,'Element常用组件详解',3,'2019-09-05 22:39:59'),(453,42,'实战项⽬之环境准备及配置改装',4,'2019-09-05 22:39:59'),(454,42,'⼩滴课堂后台视频管理系统之公用部分开发',5,'2019-09-05 22:39:59'),(455,42,'⼩D课堂后台视频管理系统之⾸页开发',6,'2019-09-05 22:39:59'),(456,42,'用户管理页及详解权限管理',7,'2019-09-05 22:39:59'),(457,42,'项⽬总结',8,'2019-09-05 22:39:59'),(470,43,'课程简介',1,'2019-09-05 22:39:59'),(471,43,'Python简介',2,'2019-09-05 22:39:59'),(472,43,'Python开发环境搭建',3,'2019-09-05 22:39:59'),(473,43,'Python基础数据类型',4,'2019-09-05 22:39:59'),(474,43,'深入理解Python运算符',5,'2019-09-05 22:39:59'),(475,43,'深入理解流程控制语句',6,'2019-09-05 22:39:59'),(476,43,'Python核心数据结构',7,'2019-09-05 22:39:59'),(477,43,'Python高级特性',8,'2019-09-05 22:39:59'),(478,43,'核心基础知识之函数',9,'2019-09-05 22:39:59'),(479,43,'核心基础知识之参数与变量',10,'2019-09-05 22:39:59'),(480,43,'高级知识点之函数式编程',11,'2019-09-05 22:39:59'),(481,43,'Python中的核心知识点',12,'2019-09-05 22:39:59'),(482,43,'错误的处理',13,'2019-09-05 22:39:59'),(483,43,'Python进阶之IO操作',14,'2019-09-05 22:39:59'),(484,43,'面向对象编程',15,NULL),(485,43,'面向对象高级特性',16,NULL),(486,43,'Python进阶之网络编程',17,NULL),(510,44,'Java高级核⼼玩转JDK8~13新特性课程介绍',1,'2019-10-10 22:14:00'),(511,44,'Java高级核⼼玩转JDK8新特性之接口和日期处理',2,'2019-10-10 22:14:00'),(512,44,' Java高级核心玩转JDK8 Lambda表达式',3,NULL),(513,44,'Java高级核心玩转JDK8 函数式编程',4,NULL),(514,44,'Java高级核心之玩转 JDK8 集合框架',5,NULL),(515,44,'Java高级核心之玩转 JDK8 集合框架进阶',6,NULL),(516,44,' Java高级核心之玩转 JDK8 收集器器和集合统计',7,NULL),(517,44,'Java高级核⼼之玩转 JDK8 Collection和Lambda实战',8,NULL),(518,44,'Java高级核⼼之玩转 JDK8 新的内存空间和异常处理',9,NULL),(519,44,'Java高级核⼼之玩转JDK9常见特性讲解',10,NULL),(520,44,'Java高级核⼼之玩转JDK9的Stream和集合API',11,NULL),(521,44,'Java高级核⼼之玩转JDK10和JDK11常⻅特性',12,NULL),(522,44,'Java高级核⼼之大话JDK12和JDK13',13,NULL),(523,44,'Java高级核⼼之JDK8~13课程总结',14,NULL),(600,45,'Docker容器的介绍与整套课程大纲',1,NULL),(601,45,'Docker容器基础入门实战',2,NULL),(602,45,'Docker核心必备之自定义镜像实战',3,NULL),(603,45,'Docker核心知识之网络模式与特权指令',4,NULL),(604,45,'实战系列之利用Compose操作容器',5,NULL),(605,45,'Docker企业核心知识之镜像仓库实战',6,NULL),(650,46,'跨平台编程语⾔Java编程史',1,NULL),(651,46,'Java开发环境准备和基础语法第⼀季',2,NULL),(652,46,'集成开发环境IDEA安装使⽤',3,NULL),(653,46,'Java开发环境准备和基础语法第⼆季',4,NULL),(654,46,'Java基础语法进阶',5,NULL),(655,46,'Java ⾯向对象编程OOP',6,NULL),(656,46,'Java 异常Exception讲解',7,NULL),(657,46,'Java进阶核⼼之集合框架Collection',8,NULL),(658,46,'Java进阶核⼼之三⼤集合框架拓展',9,NULL),(659,46,'Java进阶核⼼之File⽂件和⽬录',10,NULL),(660,46,'Java进阶核⼼之Input、Output Stream流',11,NULL),(661,46,'Java进阶核⼼之Reader、Writer字符流',12,NULL),(662,46,'Java核⼼之常⻅时间⽇期讲解',13,NULL),(663,46,'Java进阶核⼼之常⻅class类讲解',14,NULL),(664,46,'Java枚举类Enum',15,NULL),(665,46,'项⽬实战之开发⼈⼯智能问答机器⼈上',16,NULL),(666,46,'项⽬实战之开发⼈⼯智能问答机器⼈下',17,NULL),(667,46,'⼩滴课堂疯狂新版Java系列基础课程总结',18,NULL),(710,47,'初识NodeJs',1,NULL),(711,47,'NodeJs核⼼模块api-基础',2,NULL),(712,47,'http全⾯解析',3,NULL),(713,47,'Nodejs 核心模块api-路由与接口',4,NULL),(714,47,'Nodejs连接Mysql',5,NULL),(715,47,'分布式文件储存数据库MongoDB',6,NULL);CREATE TABLE `episode` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`title` varchar(524) DEFAULT NULL COMMENT '集标题',`num` int(10) DEFAULT NULL COMMENT '第几集,全局顺序',`ordered` int(11) DEFAULT NULL COMMENT '顺序，章里面的顺序',`play_url` varchar(256) DEFAULT NULL COMMENT '播放地址',`chapter_id` int(11) DEFAULT NULL COMMENT '章节主键id',`free` tinyint(2) DEFAULT '0' COMMENT '0表示免费，1表示首付',`video_id` int(10) DEFAULT NULL COMMENT '视频id',`create_time` datetime DEFAULT NULL COMMENT '创建时间',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;INSERT INTO `episode` (`id`, `title`, `num`, `ordered`, `play_url`, `chapter_id`, `free`, `video_id`, `create_time`)
VALUES(11000,'微信小程序课程介绍',1,1,'xdclass.net/aaa.mp4',370,0,40,NULL),(11001,'小程序是什么？小程序应用前景',2,2,'xdclass.net/aaa.mp4',370,0,40,NULL),(11002,'微信小程序的注册流程',3,3,'xdclass.net/aaa.mp4',370,0,40,NULL),(11003,'微信开发者工具安装及使用讲解',4,4,'xdclass.net/aaa.mp4',370,1,40,NULL),(11004,'小程序目录结构分析',5,5,'xdclass.net/aaa.mp4',370,1,40,NULL),(11005,'小程序配置文件分析',6,6,'xdclass.net/aaa.mp4',370,1,40,NULL),(11006,'新建一个小程序及框架组成介绍',7,1,'xdclass.net/aaa.mp4',371,1,40,NULL),(11007,'小程序生命周期和页面生命周期讲解',8,2,'xdclass.net/aaa.mp4',371,1,40,NULL),(11008,'了解小程序自适应尺寸单位rpx',9,3,'xdclass.net/aaa.mp4',371,1,40,NULL),(11009,'如何使用flex弹性布局',10,4,'xdclass.net/aaa.mp4',371,1,40,NULL),(11010,'必备知识点之数据绑定的概念和基础',11,1,'xdclass.net/aaa.mp4',372,1,40,NULL),(11011,'详细讲解动态数据绑定',12,2,'xdclass.net/aaa.mp4',372,1,40,NULL),(11012,'深度了解小程序的条件渲染',13,3,'xdclass.net/aaa.mp4',372,1,40,NULL),(11013,'深度了解小程序的列表渲染',14,4,'xdclass.net/aaa.mp4',372,1,40,NULL),(11014,'讲解绑定事件与事件交互',15,5,'xdclass.net/aaa.mp4',372,1,40,NULL),(11015,'深入了解事件机制--catch与bind',16,6,'xdclass.net/aaa.mp4',372,1,40,NULL),(11016,'小程序基础组件介绍',17,1,'xdclass.net/aaa.mp4',373,1,40,NULL),(11017,'小程序常用表单组件介绍（一）',18,2,'xdclass.net/aaa.mp4',373,1,40,NULL),(11018,'小程序常用表单组件介绍（二）',19,3,'xdclass.net/aaa.mp4',373,1,40,NULL),(11019,'小程序媒体组件介绍',20,4,'xdclass.net/aaa.mp4',373,1,40,NULL),(11020,'小程序地图组件map',21,5,'xdclass.net/aaa.mp4',373,1,40,NULL),(11021,'小程序画布组件canvas',22,6,'xdclass.net/aaa.mp4',373,1,40,NULL),(11022,'使用视图容器swiper实现轮播图',23,1,'xdclass.net/aaa.mp4',374,1,40,NULL),(11023,'深度讲解可滚动视图区域scroll-view',24,2,'xdclass.net/aaa.mp4',374,1,40,NULL),(11024,'使用scroll-view实现可滚动导航栏',25,3,'xdclass.net/aaa.mp4',374,1,40,NULL),(11025,'cover-view及cover-image',26,4,'xdclass.net/aaa.mp4',374,1,40,NULL),(11026,'小程序页面导航组件',27,5,'xdclass.net/aaa.mp4',374,1,40,NULL),(11027,'常用路由跳转方法',28,6,'xdclass.net/aaa.mp4',374,1,40,NULL),(11028,'小程序页面的传参与取参',29,7,'xdclass.net/aaa.mp4',374,1,40,NULL),(11029,'如何实现小程序的底部导航栏',30,8,'xdclass.net/aaa.mp4',374,1,40,NULL),(11030,'利用require方法加载js模块文件',31,1,'xdclass.net/aaa.mp4',375,1,40,NULL),(11031,'WXML模板编写与引入精讲',32,2,'xdclass.net/aaa.mp4',375,1,40,NULL),(11032,'讲解wxs模块引用',33,3,'xdclass.net/aaa.mp4',375,1,40,NULL),(11033,'wxs案例练习',34,4,'xdclass.net/aaa.mp4',375,1,40,NULL),(11600,'elasticsearch的课程介绍',1,1,'xdclass.net/aaa.mp4',385,0,41,NULL),(11601,'什么是全文搜索引擎',2,1,'xdclass.net/aaa.mp4',386,0,41,NULL),(11602,'为什么不用mysql做全文搜索',3,2,'xdclass.net/aaa.mp4',386,0,41,NULL),(11603,'常见的搜索引擎',4,3,'xdclass.net/aaa.mp4',386,1,41,NULL),(11604,'elasticsearch的快速安装',5,1,'xdclass.net/aaa.mp4',387,1,41,NULL),(11605,'elasticsearch之目录结构介绍',6,2,'xdclass.net/aaa.mp4',387,1,41,NULL),(11606,'elasticsearch核心概念的介绍',7,1,'xdclass.net/aaa.mp4',388,1,41,NULL),(11607,'RESTful风格的介绍',8,2,'xdclass.net/aaa.mp4',388,1,41,NULL),(11608,'索引的介绍和使用',9,3,'xdclass.net/aaa.mp4',388,1,41,NULL),(11609,'映射的介绍和使用',10,4,'xdclass.net/aaa.mp4',388,1,41,NULL),(11610,'文档的增删改查',11,5,'xdclass.net/aaa.mp4',388,1,41,NULL),(11611,'搜索的简单使用',12,6,'xdclass.net/aaa.mp4',388,1,41,NULL),(11612,'分词器的介绍和使用',13,7,'xdclass.net/aaa.mp4',388,1,41,NULL),(11613,'常见中文分词器的使用',14,8,'xdclass.net/aaa.mp4',388,1,41,NULL),(11614,'常见的字段类型',15,9,'xdclass.net/aaa.mp4',388,1,41,NULL),(11615,'kibana的安装和使用',16,10,'xdclass.net/aaa.mp4',388,1,41,NULL),(11616,'es之批量导入数据',17,1,'xdclass.net/aaa.mp4',389,1,41,NULL),(11617,'es之term的多种查询',18,2,'xdclass.net/aaa.mp4',389,1,41,NULL),(11618,'玩转es的范围查询',19,3,'xdclass.net/aaa.mp4',389,1,41,NULL),(11619,'玩转es的布尔查询',20,4,'xdclass.net/aaa.mp4',389,1,41,NULL),(11620,'玩转es的排序',21,5,'xdclass.net/aaa.mp4',389,1,41,NULL),(11621,'玩转es聚合查询之指标聚合',22,6,'xdclass.net/aaa.mp4',389,1,41,NULL),(11622,'玩转es聚合查询之桶聚合',23,7,'xdclass.net/aaa.mp4',389,1,41,NULL),(11623,'es之query_string查询',24,8,'xdclass.net/aaa.mp4',389,1,41,NULL),(11624,'es之索引别名的使用',25,1,'xdclass.net/aaa.mp4',390,1,41,NULL),(11625,'es之如何重建索引',26,2,'xdclass.net/aaa.mp4',390,1,41,NULL),(11626,'es之refresh操作',27,3,'xdclass.net/aaa.mp4',390,1,41,NULL),(11627,'es之高亮查询',28,4,'xdclass.net/aaa.mp4',390,1,41,NULL),(11628,'es之查询建议',29,5,'xdclass.net/aaa.mp4',390,1,41,NULL),(11629,'NBA搜索实战之设计思路',30,1,'xdclass.net/aaa.mp4',391,1,41,NULL),(11630,'springboot整合elasticsearch和mysql',31,2,'xdclass.net/aaa.mp4',391,1,41,NULL),(11631,'elasticsearch之javaapi的使用',32,3,'xdclass.net/aaa.mp4',391,1,41,NULL),(11632,'NBA搜索实战之导入球员数据',33,4,'xdclass.net/aaa.mp4',391,1,41,NULL),(11633,'NBA搜索实战之通过名字查找球员',34,5,'xdclass.net/aaa.mp4',391,1,41,NULL),(11634,'NBA搜索实战之通过国家或球队查找球员',35,6,'xdclass.net/aaa.mp4',391,1,41,NULL),(11635,'NBA搜索实战之通过字母查找球员',36,7,'xdclass.net/aaa.mp4',391,1,41,NULL),(11636,'通往集群世界的大门',37,1,'xdclass.net/aaa.mp4',392,1,41,NULL),(11637,'es集群的基本核心概念',38,2,'xdclass.net/aaa.mp4',392,1,41,NULL),(11638,'手把手教你搭建es集群',39,3,'xdclass.net/aaa.mp4',392,1,41,NULL),(11639,'es集群索引分片管理',40,4,'xdclass.net/aaa.mp4',392,1,41,NULL),(11640,'玩转es集群健康管理',41,5,'xdclass.net/aaa.mp4',392,1,41,NULL),(11641,'elasticsearch分布式工作原理',42,1,'xdclass.net/aaa.mp4',393,1,41,NULL),(11642,'elasticsearch文档的路由原理',43,2,'xdclass.net/aaa.mp4',393,1,41,NULL),(11643,'剖析elasticsear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22:14:00',9.30),(46,'新版javase零基础到高级教程小白自学编程','https://xdvideo-file.oss-cn-shenzhen.aliyuncs.com/video/2020/%E6%96%B0%E7%89%88javase/%E8%AF%A6%E6%83%85%E5%9B%BE.png','https://file.xdclass.net/video/2020/%E6%96%B0%E7%89%88javase/%E5%AE%98%E7%BD%91%E4%B8%BB%E5%9B%BE-javase.png',3980,'2021-01-24 22:14:00',8.80),(47,'Nodejs教程零基础入门到项目实战前端视频教程','https://xdvideo-file.oss-cn-shenzhen.aliyuncs.com/video/2020/node/%E5%AE%98%E7%BD%91%E8%AF%A6%E6%83%85%E5%9B%BE-node.png','https://xdvideo-file.oss-cn-shenzhen.aliyuncs.com/video/2020/node/%E5%AE%98%E7%BD%91%E4%B8%BB%E5%9B%BE-node.png',6980,'2021-01-24 22:14:00',8.90);CREATE TABLE `video_banner` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`url` varchar(256) DEFAULT NULL COMMENT '跳转地址',`img` varchar(256) DEFAULT NULL COMMENT '图片地址',`create_time` datetime DEFAULT NULL,`weight` int(11) DEFAULT NULL COMMENT '数字越小排越前',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;INSERT INTO `video_banner` (`id`, `url`, `img`, `create_time`, `weight`)
VALUES(1,'https://m.xdclass.net/#/coursedetail?video_id=49','https://file.xdclass.net/video/2020/%E9%9D%A2%E8%AF%95%E4%B8%93%E9%A2%98/%E9%9D%A2%E8%AF%95%E4%B8%93%E9%A2%98%E7%AC%AC%E4%B8%80%E5%AD%A3banner.png','2021-01-01 09:10:10',9),(2,'https://m.xdclass.net/#/member','https://file.xdclass.net/video/%E5%AE%98%E7%BD%91%E8%BD%AE%E6%92%AD%E5%9B%BE/%E8%BD%AE%E6%92%AD%E5%9B%BE-VIP.png','2021-11-01 09:10:10',1),(3,'https://m.xdclass.net/#/coursedetail?video_id=48','https://file.xdclass.net/video/2020/c%E8%AF%AD%E8%A8%80/WechatIMG5.png','2021-12-01 09:10:10',3),(4,'https://m.xdclass.net/#/coursedetail?video_id=47','https://file.xdclass.net/video/2020/node/node_banner.png','2021-01-01 20:10:10',4);CREATE TABLE `video_order` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`out_trade_no` varchar(64) DEFAULT NULL COMMENT '订单唯一标识',`state` int(11) DEFAULT NULL COMMENT '0表示未支付，1表示已支付',`create_time` datetime DEFAULT NULL COMMENT '订单生成时间',`total_fee` int(11) DEFAULT NULL COMMENT '支付金额，单位分',`video_id` int(11) DEFAULT NULL COMMENT '视频主键',`video_title` varchar(256) DEFAULT NULL COMMENT '视频标题',`video_img` varchar(256) DEFAULT NULL COMMENT '视频图片',`user_id` int(12) DEFAULT NULL COMMENT '用户id',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;INSERT INTO `video_order` (`id`, `out_trade_no`, `state`, `create_time`, `total_fee`, `video_id`, `video_title`, `video_img`, `user_id`)
VALUES(38,'e21f9994-8054-4760-b37d-dbc24c5883c6',1,'2020-05-01 21:35:51',5980,45,'Docker实战视频教程入门到高级dockerfile/compose-Harbor','https://xdvideo-file.oss-cn-shenzhen.aliyuncs.com/video/2020/Docker/%E5%AE%98%E7%BD%91%E4%B8%BB%E5%9B%BE-docker.png',18);

    二、项目环境搭建

    1.创建项目

    在线创建:https://start.spring.io/

    2.在pom.xml中添加依赖

    <!--springboot核心包--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency><!--mybatis依赖--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.2</version></dependency><!--mysql驱动--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--通用工具包--><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.9</version></dependency><!-- JWT相关 --><dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt</artifactId><version>0.7.0</version></dependency><!--guava依赖包--><dependency><groupId>com.google.guava</groupId><artifactId>guava</artifactId><version>19.0</version></dependency><!--热部署相关：在运行时更新Java类文件，而不需要重新启动应用--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><optional>true</optional></dependency>
<build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><fork>true</fork><!--必须添加这个配置--></configuration></plugin></plugins></build>

    实现热部署idea配置

    3.配置数据库连接

     创建配置文件：通过mybatis实现，添加数据库信息配置，有两种类型，yml格式和properties格式

    xx.yml

     YAML（Yet Another Markup Language）

    写 YAML 用空格 Space 缩进表示分层，不同层次之间的缩进可以使用不同的空格数目；

    key后面的冒号，后面一定要跟一个空格,树状结构 

    xx.properties（推荐）

     Key=Value格式

    语法简单，不容易出错 

    官方文档配置

     https://docs.spring.io/spring-boot/docs/2.3.0.BUILD-SNAPSHOT/reference/htmlsingle/#core-properties

    如果需要修改，直接复制对应的配置文件加到application.properties里面 

    application.properties

    
server.port=8081#==============================数据库相关配置========================================
spring.datasource.driver-class-name =com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/online_education?serverTimezone=Asia/Shanghai&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123#使用阿里巴巴druid数据源，默认使用自带的
#spring.datasource.type =com.alibaba.druid.pool.DruidDataSource
#开启控制台打印sql
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl# mybatis 下划线转驼峰配置,两者都可以
#mybatis.configuration.mapUnderscoreToCamelCase=true
mybatis.configuration.map-underscore-to-camel-case=true
#配置扫描
mybatis.mapper-locations=classpath:mapper/*.xml#配置xml的结果别名
mybatis.type-aliases-package=net.xdclass.online_xdclass.model.entity

    4.状态码的封装

    在utils下创建工具类

    JsonData：规范运行返回结果

    package net.xdclass.online_xdclass.utils;public class JsonData {/*** 状态码 0表示成功过，1表示处理中，-1 表示失败*/private Integer code;/*** 业务数据*/private Object data;/*** 信息表示*/private String msg;public  JsonData(){}public  JsonData(Integer code, Object data, String msg){this.code = code;this.data = data;this.msg = msg;}/*** 成功，不用返回数据* @return*/public static JsonData buildSuccess(){return new JsonData(0,null,null);}/*** 成功，返回数据* @param data* @return*/public static JsonData buildSuccess(Object data){return new JsonData(0,data,null);}/*** 失败，固定状态码* @param msg* @return*/public static JsonData buildError(String  msg){return new JsonData(-1 ,null,msg);}/*** 失败，自定义错误码和信息* @param code* @param msg* @return*/public static JsonData buildError(Integer code , String  msg){return new JsonData(code ,null,msg);}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public Object getData() {return data;}public void setData(Object data) {this.data = data;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}
}

    5.开发自定义异常

    对异常进行封装处理:可实现统一的错误页面

    在exception包下

    创建自定义异常类-XDException

    package net.xdclass.online_xdclass.exception;/*** 自定义异常类*/
public class XDException extends RuntimeException{private Integer code;private String msg;public XDException(Integer code, String msg){this.code = code;this.msg = msg;}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}
}

    创建异常处理类-CustomExceptionHandler

    通过注解进行标注，对指定异常进行捕获处理

    package net.xdclass.online_xdclass.exception;import net.xdclass.online_xdclass.utils.JsonData;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;/*** 异常处理类*/
@ControllerAdvice//全局异常处理类
public class CustomExceptionHandler {//日志记录器private final static Logger logger = LoggerFactory.getLogger(CustomExceptionHandler.class);@ExceptionHandler(value = Exception.class)//捕获指定异常@ResponseBody//返回json数据public JsonData handle(Exception e){logger.error("[ 系统异常 ]{}",e.getMessage());if( e instanceof XDException ){XDException xdException = (XDException) e;return JsonData.buildError(xdException.getCode(),xdException.getMsg());}else {return JsonData.buildError("全局异常，未知错误");}}}

     6.密码加密

    为了防止密码被爆破，在utils包下添加

    CommonUtils：MD5加密工具类

    package net.xdclass.online_xdclass.utils;import java.security.MessageDigest;/*** 工具类*/
public class CommonUtils {/*** MD5加密工具类* @param data* @return*/public static String MD5(String data)  {try {java.security.MessageDigest md = MessageDigest.getInstance("MD5");byte[] array = md.digest(data.getBytes("UTF-8"));StringBuilder sb = new StringBuilder();for (byte item : array) {sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));}return sb.toString().toUpperCase();} catch (Exception exception) {}return null;}}

    7.规范时间格式展示

    需要对api接口协议和日期格式进行调整，对实体层进行添加注解实现。

    通过@JsonProperty统一输出格式，驼峰转下划线；通过@JsonFormat格式化日期

    package net.xdclass.online_xdclass.model.entity;import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;import java.util.Date;/*** `id` int(11) unsigned NOT NULL AUTO_INCREMENT,*   `name` varchar(128) DEFAULT NULL COMMENT '昵称',*   `pwd` varchar(124) DEFAULT NULL COMMENT '密码',*   `head_img` varchar(524) DEFAULT NULL COMMENT '头像',*   `phone` varchar(64) DEFAULT '' COMMENT '手机号',*   `create_time` datetime DEFAULT NULL COMMENT '创建时间',*/
public class User {private Integer id;private String name;@JsonIgnore//配置json数据的忽略字段,如果不配置，默认返回private String pwd;@JsonProperty("head_img")//配置json数据的字段名,如果不配置，默认使用属性名private String headImg;private String phone;@JsonProperty("create_time")@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")//配置json数据的时间格式,如果不配置，默认使用时间戳private Date createTime;@Overridepublic String toString() {return "User{" +"id=" + id +", name='" + name + '\'' +", pwd='" + pwd + '\'' +", headImg='" + headImg + '\'' +", phone='" + phone + '\'' +", createTime=" + createTime +'}';}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}public String getHeadImg() {return headImg;}public void setHeadImg(String headImg) {this.headImg = headImg;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}public Date getCreateTime() {return createTime;}public void setCreateTime(Date createTime) {this.createTime = createTime;}
}

    8.添加Guava本地缓存 

    • 缓存：使程序不必去数据库或者其他持久化设备中查询，直接在内存中调用对象,从而提高性能。
    • 类别：DNS缓存、前端缓存、代理服务器缓存Nginx、应用程序缓存（本地缓存、分布式缓存）、数据库缓存
    • 分布式缓存：应用分离的缓存组件或服务，常见的有 Redis、Memcached。
    • 本地缓存：和业务程序一起的缓存，常见的有myabtis的一级或者二级缓存、框架本身的缓存、 redis本地单机服务、ehchche、guava cache，访问速度快，但是不能在多个节点共享。

    参考的github地址：https://github.com/google/guava/wiki/CachesExplained

    在pom.xml中添加依赖

    在utils下添加api封装工具类

    BaseCache

    package net.xdclass.online_xdclass.utils;import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.springframework.stereotype.Component;import java.util.concurrent.TimeUnit;@Component
public class BaseCache {private Cache<String,Object> tenMinuteCache = CacheBuilder.newBuilder()//设置缓存初始大小，应该合理设置，后续会扩容.initialCapacity(10)//最大值.maximumSize(100)//并发数设置.concurrencyLevel(5)//缓存过期时间，写入后10分钟过期.expireAfterWrite(600,TimeUnit.SECONDS)//统计缓存命中率.recordStats().build();private Cache<String,Object> oneHourCache = CacheBuilder.newBuilder()//设置缓存初始大小，应该合理设置，后续会扩容.initialCapacity(30)//最大值.maximumSize(100)//并发数设置.concurrencyLevel(5)//缓存过期时间，写入后1小时 过期.expireAfterWrite(3600,TimeUnit.SECONDS)//统计缓存命中率.recordStats().build();public Cache<String, Object> getOneHourCache() {return oneHourCache;}public void setOneHourCache(Cache<String, Object> oneHourCache) {this.oneHourCache = oneHourCache;}public Cache<String, Object> getTenMinuteCache() {return tenMinuteCache;}public void setTenMinuteCache(Cache<String, Object> tenMinuteCache) {this.tenMinuteCache = tenMinuteCache;}
}

    9.JWT

    实现通信双方之间以 JSON 对象的形式安全传递信息的工具，其实质是通过一定规范来生成token，然后可以通过解密算法逆向解密token，来获取用户信息。

    在utils下添加

    package net.xdclass.online_xdclass.utils;import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import net.xdclass.online_xdclass.model.entity.User;import java.util.Date;/*** Jwt工具类* 注意点:* 1、生成的token, 是可以通过base64进行解密出明文信息* 2、base64进行解密出明文信息，修改再进行编码，则会解密失败* 3、无法作废已颁布的token，除非改秘钥*/
public class JWTUtils {/*** 过期时间，一周*/private  static final long EXPIRE = 60000 * 60 * 24 * 7;//private  static final long EXPIRE = 1;/*** 加密秘钥*/private  static final String SECRET = "xdclass.net168";/*** 令牌前缀*/private  static final String TOKEN_PREFIX = "xdclass";/*** subject*/private  static final String SUBJECT = "xdclass";/*** 根据用户信息，生成令牌* @param user* @return*/public static String geneJsonWebToken(User user){String token = Jwts.builder().setSubject(SUBJECT).claim("head_img",user.getHeadImg()).claim("id",user.getId()).claim("name",user.getName()).setIssuedAt(new Date()).setExpiration(new Date(System.currentTimeMillis() + EXPIRE)).signWith(SignatureAlgorithm.HS256,SECRET).compact();token = TOKEN_PREFIX + token;return token;}/*** 校验token的方法* @param token* @return*/public static Claims checkJWT(String token){try{final  Claims claims = Jwts.parser().setSigningKey(SECRET).parseClaimsJws(token.replace(TOKEN_PREFIX,"")).getBody();return claims;}catch (Exception e){return null;}}
}

    三、构建项目开发

    1.创建项目结构

    • controller:存放控制器的相关代码

    • service：存放业务逻辑代码，再建impl 包存放业务接口或数据访问接口实现类

    • controller-service-dao：也称mapper层，存放数据访问接口

    • domain：存放实体类

    • utils：存放工具类 

    • utils-config-interceptor：存放拦截器

    规范资源访问路径

    /api/v1/pub/AA/BB 这个是不需要登录

    /api/v1/pri/AA/BB 这个是需要登录

    2.开发实体层和dao层(mapper层)

    可以使用mybatis插件实现自动生成这两层，参照以下步骤： 

     配置数据库连接

    生成实体层和dao层

    用mybatix插件实现，安装mybatix插件

    选中表，右键

      

    调整后的项目结构 

    具体讲解

    如:Video实体类

    package net.xdclass.online_xdclass.model.entity;import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonProperty;import java.util.Date;
import java.util.List;/***  小滴课堂 视频对象**  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,*   `title` varchar(524) DEFAULT NULL COMMENT '视频标题',*   `summary` varchar(1026) DEFAULT NULL COMMENT '概述',*   `cover_img` varchar(524) DEFAULT NULL COMMENT '封面图',*   `price` int(11) DEFAULT NULL COMMENT '价格,分',*   `create_time` datetime DEFAULT NULL COMMENT '创建时间',*   `point` double(11,2) DEFAULT '8.70' COMMENT '默认8.7，最高10分',*/
public class Video {private Integer id;private String title;private String summary;private String coverImg;private Integer  price;private Date createTime;private Double point;private List<Chapter> chapterList;public List<Chapter> getChapterList() {return chapterList;}public void setChapterList(List<Chapter> chapterList) {this.chapterList = chapterList;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getSummary() {return summary;}public void setSummary(String summary) {this.summary = summary;}public String getCoverImg() {return coverImg;}public void setCoverImg(String coverImg) {this.coverImg = coverImg;}public Integer getPrice() {return price;}public void setPrice(Integer price) {this.price = price;}public Date getCreateTime() {return createTime;}public void setCreateTime(Date createTime) {this.createTime = createTime;}public Double getPoint() {return point;}public void setPoint(Double point) {this.point = point;}@Overridepublic String toString() {return "Video{" +"id=" + id +", title='" + title + '\'' +", summary='" + summary + '\'' +", coverImg='" + coverImg + '\'' +", price=" + price +", createTime=" + createTime +", point=" + point +'}';}
}

    开发数据库接口层：

    创建xml文件：存放sql语句

    <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="net.xdclass.online_xdclass.mapper.VideoMapper"><select id="listVideo" resultType="Video">select * from video</select><select id="findById" resultType="Video">select * from video where id=#{video_id}</select><select id="listVideoBanner" resultType="VideoBanner">select  * from video_banner order by weight asc</select><resultMap id="VideoDetailResultMap" type="Video"><id column="id" jdbcType="INTEGER" property="id"/><result column="title" jdbcType="VARCHAR" property="title"/><result column="summary" jdbcType="VARCHAR" property="summary"/><result column="cover_img" jdbcType="VARCHAR" property="coverImg"/><result column="price" jdbcType="INTEGER" property="price"/><result column="point" jdbcType="DOUBLE" property="point"/><result column="create_time" jdbcType="TIMESTAMP" property="createTime"/><collection property="chapterList" ofType="Chapter"><id column="chapter_id" jdbcType="INTEGER" property="id"/><result column="chapter_title" jdbcType="VARCHAR" property="title"/><result column="ordered" jdbcType="INTEGER" property="ordered"/><result column="chapter_create_time" jdbcType="TIMESTAMP" property="createTime"/><collection property="episodeList" ofType="Episode"><id column="episode_id" jdbcType="INTEGER" property="id"/><result column="num" jdbcType="INTEGER" property="num"/><result column="episode_title" jdbcType="VARCHAR" property="title"/><result column="episode_ordered" jdbcType="INTEGER" property="ordered"/><result column="play_url" jdbcType="VARCHAR" property="playUrl"/><result column="free" jdbcType="INTEGER" property="free"/><result column="episode_create_time" jdbcType="TIMESTAMP" property="createTime"/></collection></collection></resultMap><select id="findDetailById" resultMap="VideoDetailResultMap">selectv.id, v.title,v.summary,v.cover_img,v.price,v.point,v.create_time,c.id as chapter_id, c.title as chapter_title, c.ordered,c.create_time as chapter_create_time,e.id as episode_id,e.num, e.title as episode_title,e.ordered as episode_ordered,e.play_url,e.free,e.create_time as episode_create_timefrom video vleft join chapter c on v.id=c.video_idleft join episode e on c.id= e.chapter_idwhere v.id = #{video_id}order by c.ordered,e.num asc</select></mapper>

    创建mapper接口：数据库访问接口，实现sql映射。

    package net.xdclass.online_xdclass.mapper;import net.xdclass.online_xdclass.model.entity.Video;
import net.xdclass.online_xdclass.model.entity.VideoBanner;
import org.apache.ibatis.annotations.Param;import java.util.List;public interface VideoMapper{/*** 查询视频列表* @return*/List<Video> listVideo();/*** 首页轮播图列表* @return*/List<VideoBanner> listVideoBanner();/*** 查询视频详情* @param videoId* @return*///注意这里的参数名必须和xml文件中的参数名一致,@Param注解是为属性起一个别名Video findDetailById(@Param("video_id") int videoId);/*** 简单查询视频信息* @param videoId* @return*/Video findById(@Param("video_id") int videoId);
}

     3.开发controller层

     VideoController

    package com.example.classdemo.controller;import com.example.classdemo.domain.request.LoginRequest;
import com.example.classdemo.service.UserService;
import com.example.classdemo.utils.JsonData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.Map;@RestController
@RequestMapping("api/v1/pri/user")
public class UserController {@AutowiredUserService userservice;//实现用户注册@PostMapping("/register")public JsonData register(@RequestBody Map<String,String> userInfo){//将前端传来的json数据转化为map，通过@RequestBody注解封装成map对象int rows=userservice.save(userInfo);//调用service层的方法实现注册return rows==1?JsonData.buildSuccess():JsonData.buildError("注册失败");}//实现用户登录:前端页面提交数据@PostMapping("/login")public JsonData login(@RequestBody LoginRequest loginRequest){String token=userservice.findUserByPhoneAndPwd(loginRequest.getPhone(),loginRequest.getPwd());return token==null?JsonData.buildError("登录失败"):JsonData.buildSuccess(token);}}

    4.开发service层

    创建service接口：编写业务功能

    VideoService

    package com.example.classdemo.service;import com.example.classdemo.domain.Video;import java.util.List;//操作视频的业务接口：增删改查基本方法
public interface VideoService {//查询视频列表List<Video> listVideo();
}

    创建对应实现类

    VideoServiceImpl：重写接口中的方法

    package com.example.classdemo.service.impl;import com.example.classdemo.domain.Video;
import com.example.classdemo.mapper.VideoMapper;
import com.example.classdemo.service.VideoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;@Service
public class VideoServiceImpl implements VideoService {@Autowiredprivate VideoMapper videoMapper;public List<Video> listVideo(){List<Video> videolist=videoMapper.select();if(videolist!=null){return videolist;}else{return null;}}
}

    5.配置启动类

    OnlineXdclassApplication类：配置扫描包位置，才能实现将各类注入Spring容器中去

    @EnableTransactionManagement开启事务管理

    package com.example.classdemo;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.transaction.annotation.EnableTransactionManagement;@SpringBootApplication
@MapperScan("com.example.classdemo.mapper")
@EnableTransactionManagement//开启事务管理
public class ClassDemoApplication {public static void main(String[] args) {SpringApplication.run(ClassDemoApplication.class, args);}}

    6.用postman进行测试

    四、个人小结

          根据以上配置，大家是可以用Postman来测试到跟我一样的效果的。对于想熟悉MyBatis的原始开发操作，大家可以按照编写实体类--->编写Controller---->编写Service---->编写DAO(Mapper接口)----->编写XML文件，来实现MyBatis的CRUD。

           至于用MyBatis插件生成的实体层与Mapper层涉及的陌生语法咱们下篇揭晓，各位看官敬请期待！  

    http://www.dtcms.com/wzjs/3998.html

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