@Value in spring returns

Question

봄에서 @value를 사용하여 속성에서 Java java 상수로 값을로드했습니다.

그러나 상수의 값으로 null이 나타납니다. 도와주세요.

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:tx="http://www.springframework.org/schema/tx" 
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
    xmlns:util="http://www.springframework.org/schema/util" 
    xmlns="http://www.springframework.org/schema/beans" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd 
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd 
           http://www.springframework.org/schema/mvc 
           http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
           http://www.springframework.org/schema/util 
           http://www.springframework.org/schema/util/spring-util-3.0.xsd" > 

    <context:component-scan base-package="com.epro.aemcrmsync" /> 

    <context:annotation-config /> 

    <context:property-placeholder location="classpath:com/epro/aemcrmsync/properties/config.properties" /> 

</beans> 

등급 : static 구성원을 처리하지 않습니다

package com.epro.aemcrmsync.constants; 

import org.springframework.beans.factory.annotation.Value; 
import org.springframework.stereotype.Component; 


@Component 
public class ConfigConstants { 


    @Value("$(field_name}") 
    public static String USER_ID; 

} 

Answer 1

봄. 필드를 인스턴스 필드로 만듭니다. 빈을 ConfigConstants에 삽입하십시오.