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<h2 id="_1">概念阐述</h2>
<p>服务提供者的启动过程分为初始化Log4j、bean加载（包括配置加载）和服务注册三部分。</p>
<ul>
<li>初始化Log4j</li>
</ul>
<p><code>Log4jUtils</code>默认会从<code>classpath\*:config/base/log4j.properties</code>和<code>classpath\*:config/log4j.properties</code>两个路径读取log4j配置并合并，将其传递给Log4j的<code>PropertyConfigurator</code>方法初始化Log4j。如果优先级最高的配置文件是在磁盘上，且其所在目录有写权限，则将合并的配置输出到该目录，以便于维护时观察生效的参数。</p>
<ul>
<li>bean加载</li>
</ul>
<p><code>BeanUtils</code>默认会从<code>classpath\*:META-INF/spring/\*.bean.xml</code>路径加载配置文件，并将其传递给Spring框架的<code>ClassPathXmlApplicationContext</code>完成应用上下文加载。在这个过程中会加载foundation-config模块的bean，完成配置加载。</p>
<ul>
<li>服务注册</li>
</ul>
<p>在Spring context加载完成后，<code>org.apache.servicecomb.core.CseApplicationListener</code>会加载handler配置、加载provider的schema信息，最后将微服务信息注册到服务中心。</p>
<blockquote>
<p><strong>说明：</strong><br />
ServiceComb的配置项分为三个层次：配置中心、环境变量、本地文件，三者优先级依次递减，高优先级中的配置项覆盖低优先级同名配置项。存放在配置中心的配置项可以在运行时修改。</p>
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