springboot中的基本配置(yml)

1.yml数据格式

1.1普通格式

country: China
province: SuZhou
city: SuZhou
area: gusu

person:
  name: Li
  age: 24

1.2数组格式

完整写法

hobby:
  - 跳舞
  - 篮球
  - rap

缩略写法

likes: [篮球,足球,羽毛球,网球]

1.3对象数组格式

完整写法

users:
  - name: Tom
    age: 43
  - name: Jerry
    age: 24

缩略写法

users1: [{name:Tom,age:43},{name:Jerry,age:24}]

2.获取yml属性数据

yml中数据展示

person:
  name: Li
  age: 24
  
country: China
province: SuZhou
city: SuZhou
area: gusu

hobby:
  - 跳舞
  - 篮球
  - rap

users:
  - name: Tom
    age: 43
  - name: Jerry
    age: 24
    
#使用${属性名}引用数据   
beforeDir: c:\windows
newDir: ${beforeDir}\new

方法一：@Value注解方法(单一数据)

@RestController
@RequestMapping("hello")
public class HelloController {

    @Value("${person.name}")
    private String RoleName;

    @Value("${country}")
    private String RoleCountry;

    @Value("${hobby[2]}")
    private String hobbyRap;

    @Value("${users[0].name}")
    private String usersName1;
    
    @Value("${newDir}")
    private String newDir;

    @GetMapping
    public String hello(){
        System.out.println("RoleName=>"+RoleName);
        System.out.println("RoleCountry=>"+RoleCountry);
        System.out.println("hobbyRap=>"+hobbyRap);
        System.out.println("usersName1=>"+usersName1);
        System.out.println("newDir=>"+newDir);
        return "hello~,Nice to meet you! Darling";
    }
}

方法二：Environment对象(全部数据)

SpringBoot可以使用@Autowired，自动装配，将所有的数据封装到一个对象Environment中，通过Environment中的getProperty(String name)方法获取数据。

@RestController
@RequestMapping("hello")
public class HelloController {

    //自动装配将所有的数据封装到一个对象Environment中
    @Autowired
    private Environment env;

    @GetMapping
    public String hello(){
        System.out.println(env.getProperty("person.name"));
        System.out.println(env.getProperty("country"));
        System.out.println(env.getProperty("hobby[2]"));
        System.out.println(env.getProperty("users[0].name"));
        System.out.println(env.getProperty("newDir"));
        return "hello~,Nice to meet you! Darling";
    }
}

方法三：自定义数据类型(常用)

数据准备

datasouce:
  driver: com.mysql.jdbc.Driver
  url: jdbc:mysql://localhost/springweb
  username: root
  password: master

基本步骤

1.创建类，用于封装数据。
2.将实体类bean的创建交给Spring管理
	@Component					定义为Spring管控的bean
	@ConfigurationProperties(prefix="xxx")		指定加载数据
3.使用时从Spring中直接获取信息

实际操作

构建MyData类

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

    public String getDriver() {
        return driver;
    }
    public void setDriver(String driver) {
        this.driver = driver;
    }
    public String getUrl() {
        return url;
    }
    public void setUrl(String url) {
        this.url = url;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    @Override
    public String toString() {
        return "MyData{" +
                "driver='" + driver + '\'' +
                ", url='" + url + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

在HelloController中进行注入

@RestController
@RequestMapping("hello")
public class HelloController {
	
    @Autowired
    private MyData data;

    @GetMapping
    public String hello(){
        System.out.println(data);
        return "hello~,Nice to meet you! Darling";
    }
}