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SpringBoot实现的后端开发

news 2025/4/27 6:03:31

    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！  

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