Spring註解之@PropertySource&@Value
阿新 • • 發佈:2020-08-25
@Value註解和@PropertySource註解配合使用可以將(*.properties)配置檔案中的內容動態的注入到實體類中.具體步驟如下:
1、自定義實體類(Person.java)
// 物件注入Spring容器中,交由Spring進行管理 @Component // 載入classpath下的application01.properties配置檔案中的資訊 @PropertySource("classpath:/application01.properties") // 實體類省略了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、配置檔案內容(application01.xml,配置檔案放置在resources下)
id=9527
person.name=xiaomaomao
person.xiaomaomao.age=22
3、配置類
@Configuration
@ComponentScan("com.spring01")
public class SpringConfiguration {
}
4、測試類
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中的配置檔案內容會被載入到Spring的環境中,可以通過Environment物件獲取 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、測試結果
Person{id=9527, name='xiaomaomao', age=22}
9527 xiaomaomao 22