从零开始创建一个项目，springBoot+mybatisPlus+mysql+swagger+maven

一，前提

从零开始创建一个项目，绑定了数据库

用到的技术栈：springBoot+mybatisPlus+mysql+swagger+maven

二，创建项目步骤

1，创建项目

创建出来的项目结构如图所示

2，修改配置文件

因为我比较习惯yml语言，这里我就使用yml

application.yml配置如下：

spring:datasource:url: jdbc:mysql://localhost:3306/testusername: rootpassword: ****driver-class-name: com.mysql.jdbc.Driverthymeleaf:prefix: classpath:/template/  #所有的动态页面打包后的位置suffix: .html  #添加后缀# mybatis-plus相关配置
mybatis-plus:# xml扫描，多个目录用逗号或者分号分隔（告诉 Mapper 所对应的 XML 文件位置）mapper-locations: classpath:mapper/*.xml# 以下配置均有默认值,可以不设置global-config:db-config:#主键类型 AUTO:"数据库ID自增" INPUT:"用户输入ID",ID_WORKER:"全局唯一ID (数字类型唯一ID)", UUID:"全局唯一ID UUID";id-type: auto#字段策略 IGNORED:"忽略判断"  NOT_NULL:"非 NULL 判断")  NOT_EMPTY:"非空判断"field-strategy: NOT_EMPTY#数据库类型db-type: MYSQLconfiguration:# 是否开启自动驼峰命名规则映射:从数据库列名到Java属性驼峰命名的类似映射map-underscore-to-camel-case: true# 如果查询结果中包含空值的列，则 MyBatis 在映射的时候，不会映射这个字段call-setters-on-nulls: true# 这个配置会将执行的sql打印出来，在开发或测试的时候可以用log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

3，引入相关依赖

在这个环节中，我多次启动失败都是因为版本太高，所以下面的依赖是我调整完之后，
可以正常启动的依赖配置。

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.6.1</version><relativePath/><!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>projectA</artifactId><version>0.0.1-SNAPSHOT</version><name>projectA</name><description>projectA</description><!-- jdk配置信息，最好加上，因为如果不加上，每次我启动一次项目，项目的jdk版本就变成19，然后一直报错，这个地方永久配置jdk--><properties><java.version>17</java.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- mybatisPlus 核心库 --><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.1.0</version></dependency><!-- druid依赖 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.0</version></dependency><!-- swagger依赖 --><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>2.9.2</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>2.9.2</version></dependency><!-- mysql依赖 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.46</version></dependency><!-- lombok依赖 --><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>commons-collections</groupId><artifactId>commons-collections</artifactId><version>3.2.2</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build</project>

4，准备表数据

这里我准备了四张表

CREATE TABLE `student` (`student_no` varchar(3) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL COMMENT '学号',`name` varchar(8) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL COMMENT '姓名',`sex` varchar(2) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL COMMENT '性别',`birthday` date DEFAULT NULL COMMENT '出生日期',`stu_class` varchar(5) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci DEFAULT NULL COMMENT '班级',PRIMARY KEY (`student_no`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('101', '李军', '男', '1976-02-20', '95033');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('103', '陆君', '男', '1974-06-03', '95031');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('105', '匡明', '男', '1975-10-02', '95031');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('107', '王丽', '女', '1976-01-23', '95033');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('108', '曾华', '男', '1977-09-01', '95033');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('109', '王芳', '女', '1975-02-10', '95031');

CREATE TABLE `score` (`student_no` varchar(3) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL COMMENT '学号',`course_no` varchar(5) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL COMMENT '课程编号',`score` decimal(4,1) DEFAULT NULL COMMENT '分数',PRIMARY KEY (`student_no`,`course_no`),KEY `Cno` (`course_no`),CONSTRAINT `Score_ibfk_1` FOREIGN KEY (`student_no`) REFERENCES `student` (`student_no`),CONSTRAINT `Score_ibfk_2` FOREIGN KEY (`course_no`) REFERENCES `course` (`course_no`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;INSERT INTO test.score
(student_no, course_no, score)
VALUES('101', '3-105', 64.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('101', '6-166', 85.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('103', '3-105', 92.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('103', '3-245', 86.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('105', '3-105', 88.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('105', '3-245', 75.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('107', '3-105', 91.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('107', '6-166', 79.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('108', '3-105', 78.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('108', '6-166', 81.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('109', '3-105', 76.0);
INSERT INTO test.score
(student_no, course_no, score)
VALUES('109', '3-245', 68.0);

CREATE TABLE `student` (`student_no` varchar(3) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL COMMENT '学号',`name` varchar(8) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL COMMENT '姓名',`sex` varchar(2) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL COMMENT '性别',`birthday` date DEFAULT NULL COMMENT '出生日期',`stu_class` varchar(5) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci DEFAULT NULL COMMENT '班级',PRIMARY KEY (`student_no`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('101', '李军', '男', '1976-02-20', '95033');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('103', '陆君', '男', '1974-06-03', '95031');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('105', '匡明', '男', '1975-10-02', '95031');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('107', '王丽', '女', '1976-01-23', '95033');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('108', '曾华', '男', '1977-09-01', '95033');
INSERT INTO test.student
(student_no, name, sex, birthday, stu_class)
VALUES('109', '王芳', '女', '1975-02-10', '95031');

CREATE TABLE `teacher` (`teacher_no` varchar(3) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL,`name` varchar(4) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL,`sex` varchar(2) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL,`birthday` date DEFAULT NULL,`title` varchar(6) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci DEFAULT NULL,`depart` varchar(10) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL,PRIMARY KEY (`teacher_no`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;INSERT INTO test.teacher
(teacher_no, name, sex, birthday, title, depart)
VALUES('804', '李诚', '男', '1958-12-02', '副教授', '计算机系');
INSERT INTO test.teacher
(teacher_no, name, sex, birthday, title, depart)
VALUES('825', '王萍', '女', '1972-05-05', '助教', '计算机系');
INSERT INTO test.teacher
(teacher_no, name, sex, birthday, title, depart)
VALUES('831', '刘冰', '女', '1977-08-14', '助教', '电子工程系');
INSERT INTO test.teacher
(teacher_no, name, sex, birthday, title, depart)
VALUES('856', '张旭', '男', '1969-03-12', '讲师', '电子工程系');

5，创建相关类

这里我推荐一个好用的插件mybatisX，可以自动创建相关类，很省事

先连接好数据库，刷新表

配置生成的类基本信息

都给我生成好了

6，相关注解添加

启动类处理一下

@SpringBootApplication
@MapperScan(basePackages = "com.example.mapper")
public class ProjectApplication {public static void main(String[] args) {try {SpringApplication.run(ProjectApplication.class, args);} catch (Exception e) {e.printStackTrace();}}
}

其他注解添加

7，项目可以安全启动了

8，其他文章

永久解决 Intellij idea 报错：Error : java 不支持发行版本5

Maven [ERROR] 不再支持源选项 5，请使用 7 或更高版本的解决办法

SpringBoot教程(十六) | SpringBoot集成swagger（全网最全）

SpringBoot集成swagger2报错‘apiDocumentationScanner‘ defined in URL

SpringBoot 整合MyBatisPlus

Error creating bean with name ‘**ServiceImpl‘: Unsatisfied dependency expressed through field ‘baseM

IDEA设置自动导入包

下班咯，还待完善，敬请期待。。。