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POSpring: How to inject values with @Value annotation by reading from external properties file?
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  1. POSpring: How to inject values with @Value annotation by reading from external properties file?
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    copied!<p>I have following situation<br> - Have a MongoService class, which reads host, port, database from file </p> <p><strong>xml configuration</strong> </p> <pre><code>&lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"&gt; &lt;bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"&gt; &lt;property name="locations"&gt; &lt;list&gt; &lt;value&gt;file:///storage/local.properties&lt;/value&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre> <p>The <strong>local.properties</strong> looks like </p> <pre><code>### === MongoDB interaction === ### host="127.0.0.1" port=27017 database=contract </code></pre> <p>and <strong>MongoService Class</strong> as </p> <pre><code>@Service public class MongoService { private final Mongo mongo; private final String database; private static final Logger LOGGER = LoggerFactory.getLogger(MongoService.class); public MongoService(@Nonnull final @Value("#{ systemProperties['host']}") String host, @Nonnull final @Value("#{ systemProperties['port']}") int port, @Nonnull final @Value("#{ systemProperties['database']}") String db) throws UnknownHostException { LOGGER.info("host=" + host + ", port=" + port + ", database=" + db); mongo = new Mongo(host, port); database = db; } } </code></pre> <p>When I want to test that bean is fine, I do the following in<br> <strong>MongoServiceTest.java</strong> </p> <pre><code>public class MongoServiceTest { @Autowired private MongoService mongoService; } </code></pre> <p>It complains saying that <code>can not identify bean for MongoService</code> . </p> <p>Then I add the following to above xml </p> <pre><code>&lt;bean id="mongoService" class="com.business.persist.MongoService"&gt;&lt;/bean&gt; </code></pre> <p>Then it complains saying <code>"No Matching Constructor found"</code> </p> <p><strong>What I want to do</strong> </p> <p>a.) MongoService should be <code>@Autowired</code> and reads configuration params from <code>&lt;value&gt;file:///storage/local.properties&lt;/value&gt;</code> </p> <p><strong>Question</strong> </p> <p>a.) Is accessing values in constructor are correct? <code>(file name is local.properties and I am using @Value("#{ systemProperties['host']}") syntax)</code> </p> <p>b.) What is that I need to make it work so that <code>@Autowired private MongoService mongoService</code> loads correctly and reads value off local.properties file. </p> <p>P.S. I am very new to Spring and don't really know how to make this work </p> <p>Thanks much for your help in advance</p>
 

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