differentiating multiple submit button using PropertiesMethodNameResolver

Clash Royale CLAN TAG#URR8PPPdifferentiating multiple submit button using PropertiesMethodNameResolver
I have a form with different submit buttons in Spring MVC application which is in xml. I differentiated using ParameterMethodNameResolver like
<bean id="mnr" class="pkg.ParameterMethodNameResolver">
<property name="paramName" value="opt"/>
</bean>
But the problem here is, Method names are tightly bounded to button captions. So any modification in UI will affect java application. So I just want to use PropertiesMethodNameResolver.I used like
<bean id="mnr" class="pkg.PropertiesMethodNameResolver">
<property name="mappings">
<props>
<prop key="user.htm?opt=save">register</prop>
<prop key="user.htm?opt=delete">remove</prop>
</props>
</property>
</bean>
But it is not recognizing that url with params.It is expecting direct match url.So how can i solve this issue.
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