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    <h1><a href="/spring-env-config-2018-08-30-1827-ch.html"> Spring使用环境变量控制配置文件加载  </a></h1>
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<h1>Spring环境变量的配置</h1>
<h2>环境变量</h2>
<p>项目中需要用到很多配置文件，不同环境的配置文件是不一样的，因此如果只用一个配置文件，势必会造成配置文件混乱，这里提供一种利用环境变量控制配置文件加载的方法.如果是linux环境，则修改tomcat的文件即可，具体为：../{tomcat_path}/bin/catalina.sh，找到<code>JAVA_OPTS=$JAVA_OPTS</code>，加上参数即可，例如：<code>JAVA_OPTS="$JAVA_OPTS -Dconfig_env=test</code>。</p>
<h2>系统配置文件</h2>
<p>假设我们的开发环境分为dev、uat和生产环境，则我们可以在系统中设置三个配置文件：</p>
<p><code>config_dev.properties</code>、<code>config_test.properties</code>、<code>config_prod.properties</code>。</p>
<h2>Spring加载</h2>
<p>Spring配置文件在加载时，设置“固定名+变量名”的方式进行加载，如下：</p>
<div class="highlight"><pre><span></span><span class="c">&lt;!-- 读取配置文件 --&gt;</span>
<span class="nt">&lt;context:property-placeholder</span> <span class="na">location=</span><span class="s">&quot;classpath:config_${config_env}.properties&quot;</span> <span class="na">ignore-unresolvable=</span><span class="s">&quot;true&quot;</span>  <span class="nt">/&gt;</span>
</pre></div>


<p>这里的config_${config_env}.properties在不同的环境中就能加载不同的配置文件了。</p>
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            <h4>Published</h4>
            <time pubdate="pubdate" datetime="2018-08-30T18:27:53+08:00"> 8 30, 2018</time>

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