Is it possible to have a dynamic resource path for import?

问题

I have a Spring.NET program with a configuration file. To smooth the transition from test to prod I'd like to have an environment variable that gives the path to a shared config file, and use that to import a resource, however it appears the <import resource="path"/> is not being resolved. For example if I try to load the file <import resource="\\server\share\${computername}\SpringConfig.xml"/> I get a file not found exception as below:

System.Configuration.ConfigurationErrorsException: Error creating context 'spring.root': file [\server\share\${computername}\SpringConfig.xml] cannot be resolved to local file path - resource does not use 'file:' protocol. ---> Spring.Objects.Factory.ObjectDefinitionStoreException: IOException parsing XML document from file [\server\share\${computername}\SpringConfig.xml] ---> System.IO.FileNotFoundException: file [\server\share\${computername}\SpringConfig.xml] cannot be resolved to local file path - resource does not use 'file:' protocol.

Is there a way I can have a dynamic import path in Spring.NET, preferably without writing code?

回答1:

You can do that anyway with some extra code:

• Create your own FileSystemResource that will replace placeholders in the resource name. Start from overriding the existing FileSystemResource (In Spring.Core.IO namespace)

• Register your new IResource implementation in the container using your own protocol name (ex: myfile://) See ref docs here for an example :

  1. In .NET configuration file (app.config/web.config) http://www.springframework.net/doc-latest/reference/html/resources.html#d4e2911
  2. In Spring configuration files http://www.springframework.net/doc-latest/reference/html/objects.html#context-custom-resourcehandler

• Use it! resource="myfile://\server\share\${computername}\SpringConfig.xml"

回答2:

I don't think we can do that with the current version. Latest Java version supports it, so we can expect this feature in a future version (Using variables environnement by default)

来源：https://stackoverflow.com/questions/9295061/is-it-possible-to-have-a-dynamic-resource-path-for-import