今天准备创建一个SpringBoot项目,结果发现网络不好.于是就上网搜索到相关的文章学习.
帮助链接:Idea之没有网络的情况下创建SpringBoot项目

1. 创建maven项目

2. 添加依赖

    <!--springboot基础的创建 告诉maven我们要创建的是一个springboot项目-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <mybatis-plus>3.4.2</mybatis-plus>
        <knife4j>2.0.9</knife4j>
        <mysql>8.0.13</mysql>
    </properties>

    <dependencies>
        <!--SpringBook所需的jar包 默认不需要写版本号 继承父类的版本号-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</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>
        <!--Mysql依赖-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql}</version>
        </dependency>
        <!--   lombok依赖     -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!--    mybatis-plus    -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatis-plus}</version>
        </dependency>
        <!--Java MVC框架集成Swagger生成Api文档-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>knife4j-spring-boot-starter</artifactId>
            <version>${knife4j}</version>
        </dependency>
    </dependencies>

    <!--spirng 打包成war包-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

3. 编写启动类

@SpringBootApplication  //启动类
@MapperScan(basePackages = "com.hanyulin.demo.mapper")  // 扫描mapper
public class TestApplication {
    public static void main(String[]args)
    {
        SpringApplication.run(TestApplication.class,args);
    }
}

4. application.yml连接数据库

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: 123456
    url: jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true

server:
  port: 9090

5. 编写controller

@RestController
public class TestController {

    @RequestMapping
    public String HelloWord()
    {
        return "HelloWorld";
    }
}

6. 运行项目

7. 目录结构

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