本文详细介绍了如何从零开始创建一个项目，包括配置SpringBoot、mybatisPlus、MySQL等技术栈，以及数据库表结构设计、依赖管理、类生成和注解应用等内容。
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/test
username: root
password: ****
driver-class-name: com.mysql.jdbc.Driver
thymeleaf:
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: MYSQL
configuration:
# 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
Error creating bean with name ‘**ServiceImpl‘: Unsatisfied dependency expressed through field ‘baseM
下班咯，还待完善，敬请期待。。。
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