Spring look up property dynamically

You need to look up a property from your properties file dynamically in a Spring class. If you google for this you'll find different approaches. Here is what I'm doing, which seems to work nicely.

My Spring class implements EmbeddedValueResolverAware

You then need to implement the setEmbeddedValueResolver method, so you create a field in your class:

view plainprint?

1. private StringValueResolver stringValueResolver;  
2.   
3. public void setEmbeddedValueResolver(StringValueResolver stringValueResolver) {  
4.     this.stringValueResolver = stringValueResolver;  
5. }  

private StringValueResolver stringValueResolver;

public void setEmbeddedValueResolver(StringValueResolver stringValueResolver) {
    this.stringValueResolver = stringValueResolver;
}

Now let's say have a props file:

something.1.foo=something2
something.2.foo=something1

In my Spring class above I can look it up dynamically...

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1. int dynamicVal = getSomeDyanmicVal();  
2. String foo = stringValueResolver.resolveStringValue("${something."+dynamicVal+".foo}");  

int dynamicVal = getSomeDyanmicVal();
String foo = stringValueResolver.resolveStringValue("${something."+dynamicVal+".foo}");