解決@Value失敗 - 彈簧的java

Question

在屬性文件（config.properties）我定義幾個屬性：

my.property.first=xyz 
my.property.second=12 

我創建了一個類來讀取這些屬性：

package my.package.first; 
............ 

@Configuration 
public Class MyProperties { 

    @Value("${my.property.first}") private String propertyFirst; 

    @Value ("${my.property.second}") private String propertySecond; 

    public String getPropertyFirst() { 
     return propertyFirst; 
    } 

    public int getPropertySecond() { 
     return propertySecond 
    } 

    @Bean 
    public MyProperties getInstance() { 
     return this; 
    } 
} 

現在我想放在一些其他包中的類來使用這些屬性：

package my.otherpackage.third; 

import my.property.package.first.MyProperties; 
............................. 
public class GetMyProperties{ 

    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(MyProperties.class); 

    MyProperties myProperties =context.getBean("getInstance",MyProperties.class); 

    //This returns ${my.property.first} 
    String propertyFirst = myProperties.getPropertyFirst(); 

    // This returns ${my.property.second} 
    int propertySecond = context.getBeanFactory().resolveEmbeddedValue(("${my.property.first}")); 
} 

我嘗試溶膠通過僅使用註釋來實現這一點。

我使用Spring 4

感謝

Answer 1

MyProperties是不是一個真正的@Configuration類，它是一個bean。給它註釋@Component並將@Bean聲明移動到另一個@Configuration類。無論Spring在何處定義bean（只要它位於配置類中），它都會在您的應用程序中有@ComponentScan或@SpringBootApplication的地方選擇它，我很確定你做。您MyProperties類，你讓@Component

你會想：

@Component 
public class MyProperties { 
    @Value("${my.property.first}") private String propertyFirst; 

    @Value ("${my.property.second}") private String propertySecond; 

    public String getPropertyFirst() { 
     return propertyFirst; 
    } 

    public void setPropertyFirst(String propertyFirst){ 
     this.propertyFirst = propertyFirst; 
    } 

    public int getPropertySecond() { 
     return propertySecond 
    } 

    public void setPropertySecond(String propertySecond){ 
     this.propertySecond= propertySecond; 
    } 
} 



@Configuration 
public class Config { 
    @Bean 
    public MyProperties getInstance() { 
     return new MyProperties(); 
    } 
} 



package my.otherpackage.third; 

import my.property.package.first.MyProperties; 
..... 
@EnableAutoConfiguration 
@ComponentScan(basePackages = {"my"}) 
public class GetMyProperties{ 
    public static void main(String[] args){ 
     AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(GetMyProperties.class); 

     MyProperties myProperties =context.getBean("getInstance",MyProperties.class); 

     //This returns the value of ${my.property.first} 
     String propertyFirst = myProperties.getPropertyFirst(); 

     // This returns the value of ${my.property.second} 
     int propertySecond = myProperties.getPropertySecond(); 
    } 
}