Escape property reference in Spring property file

问题

I want to escape my Spring propeties file in order to get in my bean property: ${ROOTPATH}/relativePath

I have a simple Spring config file that contains:

<context:property-placeholder location="classpath:myprops.properties" />

<bean id="myBean" class="spring.MyBean">
    <property name="myProperty" value="${myproperty}" />
</bean> 

The myprops.properties contains:

myproperty=\${ROOTPATH}/relativePath

The above setup returns: Could not resolve placeholder 'ROOTPATH'. I tried a lot of possible syntaxes but was not able to find the right one.

回答1:

Instead of ${myproperty} use #{'$'}{myproperty}. Simply replace $ with #{'$'}.

回答2:

Seems so far, that is no way to escape the ${}, however you can try below configuration to solve the problem

dollar=$

myproperty=${dollar}{myproperty}

Result for myproperty will be ${myproperty} after evaluation.

回答3:

Here is a Spring ticket which asks for escaping support (still unresolved at the time of writing).

The workaround of using

$=$
myproperty=${$}{ROOTPATH}/relativePath

does provide a solution, but looks quite dirty.

Using SPEL expressions like #{'$'} did not work for me with Spring Boot 1.5.7.

来源：https://stackoverflow.com/questions/13162346/escape-property-reference-in-spring-property-file