PropertyPlaceholderConfigurer：我可以拥有动态位置值

问题描述

现在我在我的xml文件中有这个：

 < bean id =dataSource
 class = org.springframework.jdbc.datasource.DriverManagerDataSource > 
< property name =driverClassNamevalue =com.mysql.jdbc.Driver/> 
< property name =urlvalue =jdbc：mysql：// localhost：3306 / dashboardsupervisor/> 
< property name =usernamevalue =root/> 
< property name =passwordvalue =$ {jdbc.password}/> 
< / bean> 
  

和

 < bean class =org.springframework.beans.factory.config.PropertyPlaceholderConfigurer> 
< property name =location> 
< value>文件：C：/jdbc.properties< / value> 
< / property> 
< / bean> 
  

现在，我的问题是我不知道这个文件的确切位置（jdbc.properties） ，因为这个应用程序将在不同的计算机上运行，​​在某些地方它安装在c：中，有时可能在f：..所以如果我不知道这个文件的路径，如果有的话，我可以找到它。 / p>

谢谢

解决方案

您可以将文件位置定义为系统属性，例如-Dprops.file = file：c：/1.properties

 < bean class =org.springframework.beans。 factory.config.PropertyPlaceholderConfigurer> 
< property name =location> 
< value> $ props.file< / value> 
< / property> 
< / bean> 
  

或

 < context：property-placeholder location =$ {props.file}/> 
  

或者你可以扫描文件系统

  class ScanningPropertyPlaceholderConfigurer extends org.springframework.beans.factory.config.PropertyPlaceholderConfigurer {
 
 public void setFileName（String fileName）throws FileNotFoundException {
 File file =的FindFile（文件名）; //实现文件查找器
 super.setLocation（new FileSystemResource（file））; 
} 
  

right now i have this in my xml file:

         <bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/dashboardsupervisor" />
    <property name="username" value="root" />
    <property name="password" value="${jdbc.password}" />
</bean>

and

            <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
    <value>file:C:/jdbc.properties</value>
  </property>
</bean>

Now , my problem is that i do not know the exact location of this file(jdbc.properties) , as this application will going to run on different computers , in some places its installed in c: ,sometimes may be on f:.. So if i dont know the path of this file , if there is anyway i could find it .

thanks

解决方案

You can define the file location as system property, eg -Dprops.file=file:c:/1.properties

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
    <value>$props.file</value>
  </property>
</bean>

or

<context:property-placeholder location="${props.file}"/>

or you can scan the file system

class ScanningPropertyPlaceholderConfigurer extends org.springframework.beans.factory.config.PropertyPlaceholderConfigurer {

    public void setFileName(String fileName) throws FileNotFoundException {
        File file = findFile(fileName);  // implement file finder
        super.setLocation(new FileSystemResource(file));
    }

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