读取yml文件中的自定义引用类型数据

1.首先在yml文件中配置了需要引用的datasource引用类型数据

datasource:
    driver: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost/springboot_db
    username: root
    password: 3333
server:
    port: 80

2.使用一个实体类来接收datasource（看作一个对象），并且将属性一一对应（命名需一致）。注意：使用的核心注解为@Component（交给Spring管理）、@ConfigurationProperties(prefix = "datasource")（注入属性）

@Component
@ConfigurationProperties(prefix = "datasource")
public class MyDataSource {
    private String driver;
    private String url;
    private String username;
    private String password;

    @Override
    public String toString() {
        return "MyDataSource{" +
                "driver='" + driver + '\'' +
                ", url='" + url + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }

    public void setDriver(String driver) {
        this.driver = driver;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getDriver() {
        return driver;
    }

    public String getUrl() {
        return url;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }
}

3.接下来，我们就可以使用@Autowired注解来注入MyDataSource对象，并且访问其属性了

@RestController
@RequestMapping("/ClipCoupons")
public class showAllActivities {
    @Autowired
    private MyDataSource myDataSource;

    @GetMapping("/ConfigZDYYml")
    public void ConfigZDYYml(){

        System.out.println(myDataSource);
    }


}

4.运行程序，控制台打印输出为：

MyDataSource{driver='com.mysql.jdbc.Driver', url='jdbc:mysql://localhost/springboot_db', username='root', password='3333'}