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<h3 id="Banner设置"><a href="#Banner设置" class="headerlink" title="Banner设置"></a>Banner设置</h3><blockquote>
<p>通过在classpath下添加一个banner.txt或设置banner.location来指定相应的文件可以改变启动过程中打印的banner。如果这个 文件有特殊的编码,你可以使用banner.encoding设置它(默认为UTF-8)</p>
<ul>
<li>编程式<br><strong>SpringBootApplication.setBanner(…)方法。使用 org.springframework.boot.Banner接口,实现你自己的printBanner()方法</strong><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">变量 | 描述</span><br><span class="line">${application.version} | MANIFEST.MF中声明的应用版本号,例如1.0</span><br><span class="line">${application.formatted- version}|MANIFEST.MF中声明的被格式化后的应用版本号(被括号包裹且以v作为前缀),用于显 示,例如(v1.0)</span><br><span class="line">${spring-boot.version}|正在使用的Spring Boot版本号,例如1.2.2.BUILD-SNAPSHOT</span><br><span class="line">${spring- boot.formatted-version}|正在使用的Spring Boot被格式化后的版本号(被括号包裹且以v作为前缀), 用于显示,例 如(v1.2.2.BUILD-SNAPSHOT)</span><br></pre></td></tr></table></figure>
</li>
</ul>
</blockquote>
<a id="more"></a>
<h3 id="上下文设置"><a href="#上下文设置" class="headerlink" title="上下文设置"></a>上下文设置</h3><blockquote>
<p>你需要创建一个分层的ApplicationContext(多个具有父子关系的上下文),或你只是喜欢使用流畅的构建API,你可以 使用SpringApplicationBuilder。SpringApplicationBuilder允许你以链式方式调用多个方法,包括可以创建层次结构的parent 和child方法。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">new SpringApplicationBuilder() </span><br><span class="line">.showBanner(false)</span><br><span class="line">.sources(Parent.class)</span><br><span class="line">.child(Application.class)</span><br><span class="line">.run(args);</span><br></pre></td></tr></table></figure></p>
</blockquote>
<p><strong>注:创建ApplicationContext层次时有些限制,比如,Web组件(components)必须包含在子上下文(child context)中,且相同 的Environment即用于父上下文也用于子上下文中。</strong><br><!--more--> </p>
<h3 id="Application事件和监听器"><a href="#Application事件和监听器" class="headerlink" title="Application事件和监听器"></a>Application事件和监听器</h3><p>你可以使用多种方式注册事件监听器,最普通的是使用SpringApplication.addListeners(…)方法。在你的应用运行时,应用事 件会以下面的次序发送:</p>
<ol>
<li>在运行开始,但除了监听器注册和初始化以外的任何处理之前,会发送一个ApplicationStartedEvent。</li>
<li>在Environment将被用于已知的上下文,但在上下文被创建前,会发送一个ApplicationEnvironmentPreparedEvent。 </li>
<li>在refresh开始前,但在bean定义已被加载后,会发送一个ApplicationPreparedEvent。</li>
<li>启动过程中如果出现异常,会发送一个ApplicationFailedEvent。</li>
<li>还有一个常用的ContextRefreshedEvent<br><strong>注:你通常不需要使用应用程序事件,但知道它们的存在会很方便(在某些场合可能会使用到)。</strong></li>
</ol>
<h3 id="Web环境"><a href="#Web环境" class="headerlink" title="Web环境"></a>Web环境</h3><ul>
<li>一个SpringApplication将尝试为你创建正确类型的ApplicationContext。在默认情况下,使用 AnnotationConfigApplicationContext或AnnotationConfigEmbeddedWebApplicationContext取决于你正在开发的是否是web 应用。</li>
<li>用于确定一个web环境的算法相当简单(基于是否存在某些类)。如果需要覆盖默认行为,你可以使用 setWebEnvironment(boolean webEnvironment)。通过调用setApplicationContextClass(…),你可以完全控制 ApplicationContext的类型。</li>
</ul>
<p><strong>注:当JUnit测试里使用SpringApplication时,调用setWebEnvironment(false)是可取的.</strong></p>
<h3 id="命令行启动器"><a href="#命令行启动器" class="headerlink" title="命令行启动器"></a>命令行启动器</h3><ul>
<li>如果你想获取原始的命令行参数,或一旦SpringApplication启动,你需要运行一些特定的代码,你可以实现 CommandLineRunner接口。在所有实现该接口的Spring beans上将调用run(String… args)方法。<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> org.springframework.boot.* </span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.*</span><br><span class="line"></span><br><span class="line"><span class="meta">@Component</span> </span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyBean</span> <span class="keyword">implements</span> <span class="title">CommandLineRunner</span> </span>{ </span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">(String... args)</span> </span>{</span><br><span class="line"> <span class="comment">// Do something... }</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ul>
<p><strong>如果一些CommandLineRunner beans被定义必须以特定的次序调用,你可以额外实现org.springframework.core.Ordered接 口或使用org.springframework.core.annotation.Order注解。</strong></p>
<h3 id="Application退出"><a href="#Application退出" class="headerlink" title="Application退出"></a>Application退出</h3><ul>
<li>每个SpringApplication在退出时为了确保ApplicationContext被优雅的关闭,将会注册一个JVM的shutdown钩子。所有标准的 Spring生命周期回调(比如,DisposableBean接口或@PreDestroy注解)都能使用。</li>
<li>此外,如果beans想在应用结束时返回一个特定的退出码(exit code),可以实现 org.springframework.boot.ExitCodeGenerator接口。</li>
</ul>
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