無法使用註釋從.properties文件中提取值

我想通過.proprerties文件配置我的bean String字段。但它不會替換值鍵，意味着它會回顯「$ {value}」字符串。我下面的代碼：無法使用註釋從.properties文件中提取值

主類：

public class Main { 

    public static void main(String[] args) { 
     ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-config.xml"); 
     ValuesContainer valuesContainer = (ValuesContainer) applicationContext.getBean("container"); 
     System.out.println(valuesContainer.getValue()); //echoes "${value}" instead of Ho-ho-ho! 
    } 
}

應用程序上下文：

..... 
<context:annotation-config /> 
<context:component-scan base-package="bean"/>

豆：

package bean; 

import org.springframework.beans.factory.annotation.Value; 
import org.springframework.context.annotation.PropertySource; 
import org.springframework.context.annotation.Scope; 
import org.springframework.stereotype.Component; 

@Component("container") 
@Scope("singleton") 
@PropertySource(value = "classpath:app.properties") 
public class ValuesContainer { 

    @Value("${value}") 
    private String value; 

    public String getValue() { 
     return value; 
    } 
}

個app.properties：