SpringBoot

快速入门

1.导入依赖

    <!-- SpringBootParent标签 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.7.RELEASE</version>
    </parent>

    <!-- SpringBoot起步依赖 -->
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
     <!-- 解决自定义对象封装数据警告 -->
        <dependency>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-configuration-processor</artifactId>
    		<optional>true</optional>
		</dependency>
    </dependencies>

2.编写引导类

@SpringBootApplication
public class SpringbootDemo03Application {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootDemo03Application.class, args);
    }
}

3.编写核心配置文件

• application.properties
• application.yml 【最常用】
• application.yaml

SpringBoot配置文件加载顺序

propertiex > yml > yaml

4.常用配置 - yml

• 端口号

  server:
    port: 80
  

• 自定义数据

  一级属性名:
  	二级属性名: 数据
  

  使用@Value读取单个数据，属性名引用方式：$

• Environment对象

  enterprise:
  	arg1:arg1
  	arg2:arg2
  	arg3:arg3
  

  @Autowired
  private Environment env
  
  public void getByEnterprise(){
      env.getProperty("enterprise.arg1");
      env.getProperty("enterprise.arg2");
      env.getProperty("enterprise.arg3");
  }
  

• 配置文件内容绑定实体对象

  定义实体，类上标记注解,在需要获取数据的类上直接注入bean即可获取

  public class Enterprise {
      private String name;
      private Integer age;
      private String tel;
      private String[] subject;
      //自行添加getter、setter、toString()等方法
  }
  

  enterprise:
  	arg1:arg1
  	arg2:arg2
  	arg3:arg3
  

  @Component
  @configurationProperties(prefix = "enterprise")
  public class Enterprise {
  	private string arg1;
  	private string arg2;
  	private string arg3;
  }