@Value注解和@PropertySource注解配合使用可以将(*.properties)配置文件中的内容动态的注入到实体类中.具体步骤如下:
1、自定义实体类(Person.java)
// 对象注入Spring容器中,交由Spring进行管理
@Component
// 加载classpath下的application01.properties配置文件中的信息
@PropertySource("classpath:/application01.properties")
// 实体类省略了set/get和toString方法
public class Person {
@Value("${id}")
private String id;
@Value("${person.name}")
private String name;
@Value("${person.xiaomaomao.age}")
private String age;
}
2、配置文件内容(application01.xml,配置文件放置在resources下)
id=9527
person.name=xiaomaomao
person.xiaomaomao.age=22
3、配置类
@Configuration
@ComponentScan("com.spring01")
public class SpringConfiguration {
}
4、测试类
public class SpringDemo {
@Test
public void springTest01() throws Exception {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConfiguration.class);
Person person = context.getBean("person", Person.class);
System.out.println(person);
// properties中的配置文件内容会被加载到Spring的环境中,可以通过Environment对象获取
Environment environment = context.getEnvironment();
String id = environment.getProperty("id");
String name = environment.getProperty("person.name");
String age = environment.getProperty("person.xiaomaomao.age");
System.out.println(id + " " + name + " " + age);
}
}
5、测试结果
Person{id=9527, name=‘xiaomaomao‘, age=22}
9527 xiaomaomao 22
Spring注解之@PropertySource&@Value
原文：https://www.cnblogs.com/xiaomaomao/p/13561371.html