Spring中读取配置文件的五种方式

server:
  port: 9201

    @Value("${server.port}")
    private String port;

student:
  name: 张三
  age: 18

@Configuration
@ConfigurationProperties(prefix = "student")
public class CaptchaProperties{
	private String name;
	private Integer age;
	...
}

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface Configuration {
...
}

student.name = 张三
student.age = 18

@Component
@PropertyResouce(value = "classpath:student.properties")
public class Student implements Serializable{
	@Value("${student.name}")
	private String name;
	
	@Value("${student.age}")
	private Integer age;
	...
}

student.name = 张三
student.age = 18

/**
 * @Component标识为是Spring的一个组件，只有容器组件，容器才会为ConfigurationProperties提供此注入共    	
 * 功能
 */
@Component
@PropertyResouce(value = "classpath:student.properties")
@ConfigurationProperties(prefix = "student")
public class Student implements Serializable{
	private String name;
	private Integer age;
	...
}

student:
  name: 张三
  age: 18

...
@Autowired
private Environment env;

public String getUserName(){
	return env.getProperty("student.name");
}
...