SpringBoot 官方文档示例：

一、在application.properties中定义属性：

my.firstName=amadeus1756
my.lastName=liu

二、定义实体类

package cn.edu.tju.domain;

public class AnotherComponent {
    private String firstName;
    private String lastName;

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}

三、在配置类的bean定义中使用@ConfigurationProperties

package cn.edu.tju.config;

import cn.edu.tju.domain.AnotherComponent;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.ConfigurationPropertiesScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AppConfig3 {
    @Bean
    @ConfigurationProperties(prefix = "my")
    public AnotherComponent getAnotherComponent(){
        return new AnotherComponent();
    }
}

四、在controller中注入上述bean,并使用

    @Autowired
    private AnotherComponent anotherComponent;



    @RequestMapping("getAnother")
    public String getAnother(){
        return anotherComponent.getFirstName();
    }