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<h1 id="单例模式"><a href="#单例模式" class="headerlink" title="单例模式"></a>单例模式</h1><h2 id="动机模型"><a href="#动机模型" class="headerlink" title="动机模型"></a>动机模型</h2><p>对于系统中的某些类来说，只有一个实例很重要。<br>例如：</p>
<ul>
<li>一个系统中可以存在多个打印任务，但是只能有一个正在工作的任务；</li>
<li>一个系统只能有一个窗口管理器或文件系统；</li>
<li>一个系统只能有一个计时工具或ID（序号）生成器。</li>
</ul>
<p>如何保证一个类只有一个实例并且这个实例易于被访问呢？</p>
<p>定义一个全局变量可以确保对象随时都可以被访问，但不能防止我们实例化多个对象。</p>
<p>一个更好的解决办法是让类自身负责保存它的唯一实例。<br>这个类可以保证没有其他实例被创建，并且它可以提供一个访问该实例的方法。</p>
<p>这就是单例模式的模式动机。</p>
<h2 id="模式的定义"><a href="#模式的定义" class="headerlink" title="模式的定义"></a>模式的定义</h2><p>单例模式(Singleton Pattern)：单例模式确保某一个类只有一个实例，而且自行实例化并向整个系统提供这个实例，这个类称为单例类，它提供全局访问的方法。</p>
<p>单例模式的要点有三个：</p>
<ul>
<li>某个类只能有一个实例；</li>
<li>它必须自行创建这个实例；</li>
<li>它必须自行向整个系统提供这个实例。</li>
</ul>
<p>单例模式是一种对象创建型模式。单例模式又名单件模式或单态模式。</p>
<h2 id="模式的结构"><a href="#模式的结构" class="headerlink" title="模式的结构"></a>模式的结构</h2><p><img src="../uploads/pattern/Singleton.jpg" alt="结构模式"></p>
<blockquote>
<p>以上内容<a href="https://design-patterns.readthedocs.io/zh_CN/latest/creational_patterns/singleton.html" target="_blank" rel="noopener">参考</a></p>
</blockquote>
<h2 id="实现-缺点-改进"><a href="#实现-缺点-改进" class="headerlink" title="实现 缺点 改进"></a>实现 缺点 改进</h2><h3 id="懒汉式单例"><a href="#懒汉式单例" class="headerlink" title="懒汉式单例"></a>懒汉式单例</h3><blockquote>
<p>懒加载的模式：用到的时候才加载</p>
</blockquote>
<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><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Singleton</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> Singleton instance;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="title">Singleton</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">super</span>();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Singleton <span class="title">getInstance</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">if</span>(instance == <span class="keyword">null</span>) {</span><br><span class="line"> instance = <span class="keyword">new</span> Singleton();</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> instance;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><strong>存在的问题</strong><br>懒汉式单例的实现没有考虑线程安全问题，它是线程不安全的，并发环境下很可能出现多个Singleton实例，要实现线程安全。</p>
<p>针对问题，有以下几种方式修改</p>
<p>1 在 getInstance 的方法上添加 synchronized保证只有一个线程能访问到，但是这样会有一定的性能问题<br>2 做双重判断， 具体代码如下</p>
<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><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Singleton <span class="title">getInstance</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">if</span>(instance == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">synchronized</span>(Singleron.class) {</span><br><span class="line"> <span class="keyword">if</span>(instance == <span class="keyword">null</span>) {</span><br><span class="line"> instance = <span class="keyword">new</span> Singleton();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> instance;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>使用了双重检查导致性能比1的要好一点</p>
<h3 id="饿汉式单例"><a href="#饿汉式单例" class="headerlink" title="饿汉式单例"></a>饿汉式单例</h3><blockquote>
<p>与懒汉式相对，在加载的时候就已经初始化了</p>
</blockquote>
<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><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Singleton</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> <span class="keyword">static</span> Singleton INSTANCE;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">static</span>{</span><br><span class="line"> INSTANCE = <span class="keyword">new</span> Singleton();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="title">Singleton</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">super</span>();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Singleton <span class="title">getInstance</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> INSTANCE;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>不管对于懒汉式还是饿汉式均存在反射的方式构造一个新的实例的方式， 针对这种情况，又有基于enum的单利</p>
<h3 id="基于枚举类型的单利模式"><a href="#基于枚举类型的单利模式" class="headerlink" title="基于枚举类型的单利模式"></a>基于枚举类型的单利模式</h3><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><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">enum</span> SingletonEnum{</span><br><span class="line"> INSTANCE;</span><br><span class="line"> <span class="keyword">private</span> Singleton instance;</span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="title">SingletonEnum</span><span class="params">()</span></span>{</span><br><span class="line"> instance = <span class="keyword">new</span> Resource();</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> Singleton <span class="title">getInstance</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">return</span> instance;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<h1 id="Mysql-远程登录的问题"><a href="#Mysql-远程登录的问题" class="headerlink" title="Mysql 远程登录的问题"></a>Mysql 远程登录的问题</h1><blockquote>
<p>主要是解决 Mysql 远程不能访问的问题</p>
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<p><strong>Mysql 用户添加及权限的赋予</strong></p>
<figure class="highlight sql"><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">use</span> mysql;</span><br><span class="line"><span class="comment">-- 创建用户</span></span><br><span class="line"><span class="keyword">CREATE</span> <span class="keyword">USER</span> <span class="string">'thng'</span>@<span class="string">'localhost'</span> <span class="keyword">IDENTIFIED</span> <span class="keyword">BY</span> <span class="string">'123567'</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">-- 权限服务(主要就是这个问题)</span></span><br><span class="line"><span class="keyword">GRANT</span> <span class="keyword">ALL</span> <span class="keyword">PRIVILEGES</span> <span class="keyword">ON</span> *.* <span class="keyword">TO</span> <span class="string">'thng'</span>@<span class="string">'%'</span> <span class="keyword">IDENTIFIED</span> <span class="keyword">BY</span> <span class="string">'123567'</span> <span class="keyword">WITH</span> <span class="keyword">GRANT</span> <span class="keyword">OPTION</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">FLUSH</span> <span class="keyword">PRIVILEGES</span>;</span><br></pre></td></tr></table></figure>
<p><strong>Mysql 配置修改</strong></p>
<figure class="highlight sh"><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"></span><br><span class="line">vim /etc/mysql/mysql.conf.d/mysqld.cnf</span><br><span class="line"></span><br><span class="line"><span class="comment">## 修改内容# bind-address = 127.0.0.1 这句话注释掉# 重启服务</span></span><br><span class="line">service mysql restart</span><br></pre></td></tr></table></figure>
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<h1 id="DEMO"><a href="#DEMO" class="headerlink" title="DEMO"></a>DEMO</h1><h2 id="title-1"><a href="#title-1" class="headerlink" title="title 1"></a>title 1</h2><p><strong>加粗</strong></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">demo</span> (<span class="params"></span>) </span>{</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="string">"这是遗传的代码"</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="title-2"><a href="#title-2" class="headerlink" title="title 2"></a>title 2</h2><p><strong>java</strong></p>
<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></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Demo</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span> <span class="params">(String[] args)</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"这是遗传的代码"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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