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/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。

<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>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.6.1version>
        <relativePath/>
         
    parent>
    <groupId>com.examplegroupId>
    <artifactId>projectAartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>projectAname>
    <description>projectAdescription>
    
    <properties>
        <java.version>17java.version>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <maven.compiler.source>17maven.compiler.source>
        <maven.compiler.target>17maven.compiler.target>
    properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-jdbcartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-thymeleafartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
        
        <dependency>
            <groupId>com.baomidougroupId>
            <artifactId>mybatis-plus-boot-starterartifactId>
            <version>3.1.0version>
        dependency>
        
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druidartifactId>
            <version>1.1.0version>
        dependency>
        
        <dependency>
            <groupId>io.springfoxgroupId>
            <artifactId>springfox-swagger2artifactId>
            <version>2.9.2version>
        dependency>
        <dependency>
            <groupId>io.springfoxgroupId>
            <artifactId>springfox-swagger-uiartifactId>
            <version>2.9.2version>
        dependency>
         
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.46version>
        dependency>
		
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
        dependency>
        <dependency>
            <groupId>commons-collectionsgroupId>
            <artifactId>commons-collectionsartifactId>
            <version>3.2.2version>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    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。。。