Using the Spring Expression Language with static properties
One of the things that I love about Spring 3 is the Spring Expression Language (SPEL). At first glance, SPEL does not appear to give you that much; with it, you can execute Java expressions in your Spring config files. This capability, however, is awesome when have properties that take values defined by static variables. For example, how days of the week are defined in the Calendar class:
Calendar.MONDAY
Calendar.TUESDAY
Calendar.WEDNESDAY
Calendar.THURSDAY
Calendar.FRIDAY
Calendar.SATURDAY
Calendar.SUNDAY
Prior to SPEL, if you wanted to set an integer property to Calendar.MONDAY, you had to know and specify the actual integer value for it. Using SPEL, can simply use the following snippet instead; you need to add the org.springframework.expression-3.X.X.jar to your classpath as well.
<property name="dayOfWeek" value="<entry key="#{T(java.util.Calendar).MONDAY}" />
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verycrispy posted this
