1.yml的標準結構

version: 2.0
server:
 port: 8081
 
spring:
 application:
  name: ztest-spb
 profiles:
  active: dev

2.系統中呼叫格式

env.getProperty("version"),
        env.getProperty("spring.application.name"),
        env.getProperty("spring.profiles.active"),
        env.getProperty("server.port")

3.注意 :

Caused by: org.yaml.snakeyaml.scanner.ScannerException: while scanning for the next token found character '\t(TAB)' that cannot start any token. (Do not use \t(TAB) for indentation)

 in 'reader', line 3, column 2:

.yml文字中禁止使用tab 做間隔 否則報以上錯誤

4.yml的賦值使用

    (1)使用特定的 @value*yml註解 給類中的屬性注入值 (類似從屬性檔案獲取資料然後賦值)

@RestController
public class TestController {
	
	@Value(value="${spring.application.name}")
	private  String projectname;
	
	@RequestMapping("/hello")
	public  String hello(){
		return "hello "+projectname;
	}
}

(2)將屬性檔案中的值 直接賦值給定義的物件

version: 2.0
server:
 port: 8081
 
spring:
 application:
  name: ztest-spb
 profiles:
  active: dev

#使用物件獲取值
user:
 username: 小明
 

 將屬性賦值給物件

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
 
@Component
@ConfigurationProperties(prefix = "user")
public class UserProperties {
 
    private String username;
 
    private Integer age;
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        this.username= username;
    }
 
    public Integer getAge() {
        return age;
    }
 
    public void setAge(Integer age) {
        this.age = age;
    }
}

   在類中直接自動裝配就可以使用了

@RestController
public class Test2Controller {
	
	@Autowired
	UserProperties properties;
	
	@RequestMapping("/hello")
	public  String hello(){
		return "hello "+properties.getUsername();
	}
}

OK 完成！

原創