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POHow do I load nested key value pairs from a properties file into a Java object using Spring?
 

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  1. POHow do I load nested key value pairs from a properties file into a Java object using Spring?
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    <p>I understand how to use Spring with the PropertyPlaceholderConfigurer to load a .properties file when we know what properties to expect, and use @Value to store those values into variables or some object.</p> <p>However, how do I have Spring load up a properties file with nested key,value pairs when the keys can vary?</p> <p>For example, lets say I had the following car.properties file:</p> <pre><code>Chevy=Corvette:String,1234567890:long,sportsCar:String Honda=Odyssey:String,2345678910:long,minivan:String Ford=F350:String,4567891011:long,truck:String </code></pre> <p>where each line of the properties file has a key which is the make, followed by three nested key,value pairs i.e., one for the model, one for the VIN, and one for the vehicle type i.e.,</p> <pre><code>&lt;make&gt;=&lt;model&gt;:&lt;dataType&gt;,&lt;vin&gt;:&lt;dataType&gt;,&lt;vehicleType&gt;:&lt;dataType&gt; </code></pre> <p>I'm using this structure since future vehicles will be added later, and I don't want to change my underlying Java code. And let's say I want to use these vehicle properties to generate some random data about vehicles for testing.</p> <p>How would I use Spring to load each line of the properties file as a collection of vehicle values to be stored in an arraylist? I'm figuring I'd have a 2D arraylist where each of these vehicles would be an arraylist inside the "all vehicles" arraylist. Then I would randomly select one of the vehicle arraylists to generate dummy vehicle data.</p> <p>Anyway, I think I'm on the right track, but just can't seem to figure out how I would load my nested key,value pairs using Spring. Any suggestions?</p> <p>UPDATED context.xml that works for me:</p> <p>Btw, here is the context.xml I'm using:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd"&gt; &lt;!-- creates a java.util.Properties instance with values loaded from the supplied location --&gt; &lt;util:properties id="carProperties" location="classpath:/car.properties"/&gt; &lt;bean class="com.data.rcgen.generator.CarLoader"&gt; &lt;property name="sourceProperties" ref="carProperties" /&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre>
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