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12
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<p>对任意的一个<code>Object</code>实例，只要我们获取了它的<code>Class</code>，就可以获取它的一切信息。</p>
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604
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<span class="post-meta-item-text">阅读时长 ≈</span>
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2
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<div class="post-body" itemprop="articleBody">
<p>MQTT协议是</p>
<ol>
<li>对TCP/IP协议的封装和重构。</li>
<li>最小代码占用，最小报文开支，适用于处理能力不强，网络带宽不高的设备，如各类传感器。</li>
<li>保证消息顺序性</li>
<li>支持连续的会话控制</li>
<li>支持服务质量管理</li>
<li>支持动态创建主题</li>
<li>消息支持一对一，一对多。支持集群模式，支持广播模式。</li>
</ol>
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<p>我们经常会用到判断一个字符串是否符合某一规则，像是否是一个有效手机号，是否是一个有效身份证号等等。</p>
<p>如果使用程序逻辑运算符判断，那可能是一个繁杂的任务，但是有了正则表达式，我们可以通过定一个一个简短的规则起到强大的约束作用。</p>
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