spring - 从类的静态字段中的属性文件中读取属性值 [英] spring - read property value from properties file in static field of class

问题描述

我有一个实用程序类，其中有一个方法需要用户名和密码来连接其他URL。我需要在属性文件中保留该用户名，以便我可以随时更改它。但是当我在静态方法（实用类）中使用它时，问题是它显示为null。（即它无法从属性文件中读取）。

I have one utility class where i have one method which requires username and password to connect other url. I need to kept that username in properties file so that i can change it any time. But as i am using it in static method (being utility class) , Issue is it is showing null .(i.e. it is not able to read from properties file).

但是当我在其他控制器中使用这些值时，他们就会到达那里。
所以我的问题是如何读取静态字段中的属性值

But when i ckecked that values in some other controller they are getting there. So my question is how to read property value in static field

<bean
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <list>
            <value>classpath*:/myservice_detaults.properties</value>
            <value>classpath*:/log4j.properties</value>
        </list>
    </property>
</bean>

//在Utitlity类代码中

//in Utitlity class code

  @Value("${app.username}")
      static String userName;

public static connectToUrl(){
  //use userName
 //userName showing null
}

推荐答案

在你的 Utility 类中，你可以设置一个setter方法属性然后你可以使用 MethdInvokingFactoryBean 。

In you Utility class you can have a setter method to set the properties and then you can use MethdInvokingFactoryBean.

class Utility{
    static String username;
    static String password;
    public static setUserNameAndPassword(String username, String password){
        Utility.username = username;
        Utility.password = password;
    }
    //other stuff
}

<bean
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <list>
            <value>classpath*:/myservice_detaults.properties</value>
            <value>classpath*:/log4j.properties</value>
        </list>
    </property>
</bean>

<bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="staticMethod" value="foo.bar.Utility.setUserNameAndPassword"/>
    <property name="arguments">
        <list>
            <value>${username}</value>
            <value>${password}</value>
        </list>
   </property>
</bean>

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