在spring中加载外部属性文件？

Question

I have below spring configuration. I am using spring 3 and windows OS.

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  <property name="locations">
    <list>
      <value>file:/extprops/conf/usercred.properties</value>
    </list>
  </property>
  <property name="ignoreUnresolvablePlaceholders" value="true"/>
</bean>

In above config, am trying to load external properties file file:/extprops/conf/usercred.properties and it is working. Here I did not specify the drive location in which the properties file resides. Do i need to specify the drive info in path like C or D drive ? Do i need to keep App server and properties file in the same drive ?

Answer 1

If you don't specify drive, it uses drive from current work directory which is that you are using during the launch of a process. So, it works, but unreliable - if you run the process eg by link from different drive, then it may not work. So, specify the drive too, like this:

file:///C:/extprops/conf/usercred.properties

More info: http://en.wikipedia.org/wiki/File_url

Answer 2

Also, a better/standard approach will be to create an environment variable in the system whose value will contain the path to the propery file.

Then in the configuration file, you can write as :

file:${your.prop.folder}/myproperties.properties.

This Saves efforts when there's a change in your property file location.

Answer 3

我认为属性文件应该在类路径上，这是它的正确位置...因为它是独立于路径的方式所以如果操作系统是Windows或Linux，它不会有任何问题。