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<!DOCTYPE html>
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<div class='article'>
<a href="./android/android_bitmap_cache.html"><h2>Android图片缓存</h2></a>
<div class= "well small"> 2014-03-11 11:37:00
by <a class="url fn" href="./author/suphy.html">suphy</a>
</div>
<div class="summary"><h3>开源lib Universal Image Loader</h3>
<ol>
<li>ImageLoader根据ImageView的width，height确定图片的宽高。</li>
<li>
<p>经常出现OutOfMemory:</p>
<ul>
<li>减少线程池数目.threadPoolSize（1 - 5 is recommended）</li>
<li>使用.bitmapConfig(Bitmap.Config.RGB_565)减少图片占用内存数目</li>
<li>memoryCache（new WeakMemoryCache()） 及时释放内存</li>
<li>imageScaleType(ImageScaleType.IN_SAMPLE_INT)或者imageScaleType(ImageScaleType.EXACTLY)</li>
<li>避免使用RoundedBitmapDisplayer；他会创建新的ARGB_8888格式的Bitmap对象；</li>
<li>使用.memoryCache(new WeakMemoryCache())，不要使用.cacheInMemory();</li>
</ul>
</li>
<li>
<p>内存缓存，sd卡缓存，显示图片，可以使用已经初始化过的实现；</p>
</li>
<li>为了避免使用list，grid，scroll，你可以使用：</li>
</ol>
<div class="highlight"><pre><span class="n">boolean</span> <span class="n">pauseOnScroll</span> <span class="o">=</span> <span class="nb">false</span><span class="p">;</span> <span class="c1">// or true ...</span></pre></div> <a class="btn btn-info xsmall" href="./android/android_bitmap_cache.html">read more</a></div>
</div>
<div class='article'>
<a href="./linux/linux_main_crontab.html"><h2>Linux crontab定期执行命令</h2></a>
<div class= "well small"> 2014-03-09 18:37:00
by <a class="url fn" href="./author/suphy.html">suphy</a>
</div>
<div class="summary"><h3>什么是crond，crontab</h3>
<p>Linux下面定期任务分为二部分，一部分是后台程序crond；另一部分是crontab往crond输入指令的接口。</p>
<p>crond 是linux用来定期执行程序的命令。当安装完成操作系统之后，默认便会启动此任务调度命令。crond命令每分钟会定期检查是否有要执行的工作，如果有要执行的工作便会自动执行该工作。</p>
<p>linux任务调度的工作主要分为以下两类：</p>
<ol>
<li>系统执行的工作：<br />
系统周期性所要执行的工作，如备份系统数据、清理缓存 </li>
<li>个人执行的工作：<br />
某个用户定期要做的工作，例如每隔10分钟检查邮件服务器是否有新信，这些工作可由每个用户自行设置</li>
</ol>
<p>Crontab是UNIX系统下的定时任务触发器，其使用者的权限记载在下列两个文件中：</p>
<table>
<thead>
<tr>
<th>文件</th>
<th>含义</th>
</tr>
</thead>
<tbody>
<tr>
<td>/etc/cron.deny</td>
<td>该文件中所列的用户不允许使用Crontab命令</td>
</tr>
<tr>
<td>/etc/cron.allow</td>
<td>该文件中所列的用户允许使用Crontab命令</td>
</tr>
<tr>
<td>/var/spool/cron/</td>
<td>是所有用户的crontab文件</td>
</tr>
<tr>
<td>/var/spool/cron/crontabs</td>
<td>/var/spool/cron/crontabs</td>
</tr>
</tbody>
</table>
<p>crond是linux的内置服务，但它不自动起来，可以用以下的方法启动、关闭这个服务：</p>
<div class="highlight"><pre><span class="o">/</span><span class="n">sbin</span><span class="o">/</span><span class="n">service ...</span></pre></div> <a class="btn btn-info xsmall" href="./linux/linux_main_crontab.html">read more</a></div>
</div>
<div class='article'>
<a href="./linux/linux_main_curl.html"><h2>Linux curl命令</h2></a>
<div class= "well small"> 2014-03-09 17:37:00
by <a class="url fn" href="./author/suphy.html">suphy</a>
</div>
<div class="summary"><p>Linux curl命令是一个功能强大的网络工具，它能够通过http、ftp等方式下载文件，也能够上传文件。其实curl远不止，类似的工具还有wget。</p>
<p>Linux curl命令使用了libcurl库来实现，libcurl库常用在C程序中用来处理HTTP请求，curlpp是libcurl的一个C++封装，这几个东西可以用在抓取网页、网络监控等方面的开发，而curl命令可以帮助来解决开发过程中遇到的问题。</p>
<h3>curl命令常用参数：</h3>
<div class="highlight"><pre><span class="na">-A</span><span class="err">或</span><span class="o">--</span><span class="nb">user</span><span class="na">-agent</span> <span class="p">:</span><span class="err">随意指定自己这次访问所宣称的自己的浏览器信息</span>
<span class="na">-b</span><span class="o">/--</span><span class="nb">cookie</span> <span class="o"><</span><span class="n">name</span><span class="o">=</span><span class="kt">string</span><span class="p">/</span><span class="nb">file</span><span class="o">></span> <span class="p">:</span><span class="nb">cookie</span><span class="err">字符串或文件读取位置，使用</span><span class="nb">option</span><span class="err">来把上次的</span><span class="nb">cookie</span><span class="err">信息追加到</span><span class="nx">http</span> <span class="nx">request</span><span class="err">里面去。</span>
<span class="na">-c</span><span class="o">/--</span><span class="nb">cookie</span><span class="na">-jar</span> <span class="o"><</span><span class="nb">file</span><span class="o">></span> <span class="p">:</span><span class="err">操作结束后把</span><span class="nb">cookie</span><span class="err">写入到这个文件中</span>
<span class="na">-C</span><span class="o">/--</span><span class="nb">continue</span><span class="na">-at</span> <span class="o"><</span><span class="nx">offset</span><span class="o">></span> <span class="p">:</span><span class="err">断点续转</span>
<span class="na">-d</span><span class="o">/--</span><span class="kd">data ...</span></pre></div> <a class="btn btn-info xsmall" href="./linux/linux_main_curl.html">read more</a></div>
</div>
<div class='article'>
<a href="./linux/linux_main_wget.html"><h2>Linux wget命令详解</h2></a>
<div class= "well small"> 2014-03-09 16:37:00
by <a class="url fn" href="./author/suphy.html">suphy</a>
</div>
<div class="summary"><p>wget是一个命令行的下载工具。对于我们这些 Linux 用户来说，几乎每天都在使用它。下面为大家介绍几个有用的 wget 小技巧，可以让你更加高效而灵活的使用 wget。</p>
<div class="highlight"><pre>wget -r -np -nd http://example.com/packages/
</pre></div>
<p>这条命令可以下载http://example.com网站上packages目录中得所有文件。其中：</p>
<ul>
<li>-np: 表示不遍历父目录</li>
<li>-nd: 表示不在本机重新创建目录结构</li>
</ul>
<div class="highlight"><pre>wget -r -np -nd --accept<span class="o">=</span>iso http://example.com/centos-5/i386/
</pre></div>
<p>与上一条命令相似，但多加一个<code>--accept=iso</code>选项，这指示wget仅下载 i386 目录中所有扩展名为 iso 的文件。你也可以指定多个扩展名，只需用逗号分隔即可。</p>
<div class="highlight"><pre>wget ...</pre></div> <a class="btn btn-info xsmall" href="./linux/linux_main_wget.html">read more</a></div>
</div>
<div class='article'>
<a href="./linux/linux_info.html"><h2>查看Linux系统信息命令</h2></a>
<div class= "well small"> 2014-03-09 15:37:00
by <a class="url fn" href="./author/suphy.html">suphy</a>
</div>
<div class="summary"><p>Linux中查看系统信息的常用命令:</p>
<ul>
<li>查看CPU信息</li>
</ul>
<div class="highlight"><pre><span class="n">cat</span> <span class="o">/</span><span class="n">proc</span><span class="o">/</span><span class="n">cpuinfo</span>
</pre></div>
<ul>
<li>查看内存信息 </li>
</ul>
<div class="highlight"><pre><span class="n">cat</span> <span class="o">/</span><span class="n">proc</span><span class="o">/</span><span class="n">meminfo</span>
</pre></div>
<ul>
<li>查看内存大小</li>
</ul>
<div class="highlight"><pre><span class="n">grep</span> <span class="n">MemTotal</span> <span class="o">/</span><span class="n">proc</span><span class="o">/</span><span class="n">meminfo</span>
</pre></div>
<ul>
<li>查看所有PCI设备</li>
</ul>
<div class="highlight"><pre><span class="err">$</span> <span class="o">/</span><span class="n">sbin</span><span class="o">/</span><span class="n">lspci</span>
</pre></div>
<ul>
<li>查看所有的usb设备</li>
</ul>
<div class="highlight"><pre><span class="err">$</span> <span class="o">/</span><span class="n">sbin</span><span class="o">/</span><span class="n">lsusb</span>
</pre></div>
<ul>
<li>显示系统中所有加载的模块</li>
</ul>
<div class="highlight"><pre><span class="err">$</span> <span class="o">/</span><span class="n">sbin</span><span class="o">/</span><span class="n">lsmod</span>
</pre></div>
<ul>
<li>显示当前的内存使用情况</li>
</ul>
<div class="highlight"><pre><span class="n">free</span> <span class="o">-</span><span class="n">m</span>
</pre></div>
<ul>
<li>查看系统各分区的使用情况（已用空间、可用空间等）</li>
</ul>
<div class="highlight"><pre><span class="n">df</span> <span class="o">-</span><span class="n">h</span>
</pre></div>
<ul>
<li>查看磁盘的分区及文件系统格式(需root权限)</li>
</ul>
<div class="highlight"><pre><span class="n">fdisk</span> <span class="o">-</span><span class="n">l</span>
</pre></div>
<ul>
<li>查看系统中CPU利用率、空闲率及各进程CPU、内存、IO等资源占用情况</li>
</ul>
<div class="highlight"><pre><span class="n">top</span>
</pre></div>
<ul>
<li>另一个查看统中CPU利用率、空闲率的方法</li>
</ul>
<div class="highlight"><pre><span class="n">vmstat</span> <span class="mi">5</span> <span class="err">#</span><span class="mi">5</span><span class="err">秒刷新一次</span>
</pre></div>
<ul>
<li>查看系统运行时间及负载情况</li>
</ul>
<div class="highlight"><pre><span class="n">uptime</span>
</pre></div>
<ul>
<li>查看IDE硬盘参数</li>
</ul>
<div class="highlight"><pre><span class="n">hdparm ...</span></pre></div> <a class="btn btn-info xsmall" href="./linux/linux_info.html">read more</a></div>
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<div class='article'>
<a href="./life/my_mac_repair.html"><h2>不作死不死</h2></a>
<div class= "well small"> 2014-03-04 23:07:00
by <a class="url fn" href="./author/suphy.html">suphy</a>
</div>
<div class="summary"><h3>No zuo No die</h3>
<p><img alt="image" src="../static/images/mac_adventrue.jpg" /></p>
<p>上周日在家没事做，又不想看书或敲程序，就开始想捣鼓下电脑（Macbook pro 13'）,打算光驱位改装为硬盘形成双硬盘，一块固态硬盘256G，一块普通原装硬盘500G;</p>
<p>于是头脑一热说干就干，拆解后盖、拔电源线、拆光驱、安装硬盘，再重新安装上各线，开机。。。
尼玛，出问题了。。。怎么按电源都没反应，链接外置电源还是没反应---无法开机了，这要肿么办啊。。。！ </p>
<p>难道电脑无法改装成双硬盘，于是赶紧在把光驱重新安装上去，可是还是无法开机，各种按电源键都没反应啊！！！ 这是要作死的节奏吗？ 好几千块的电脑不会就报废了吧？</p>
<blockquote>
<p>我无法接受啊，苍天啊，大地啊！ 电脑对于一个屌丝程序员来说就是命啊</p>
</blockquote>
<p>赶紧查电话联系苹果官网，询问是什么原因？ </p>
<p>客服MM还是很热情的，细心询问问题，建议我去最近的苹果官方售后去检测下。于是，我就赶紧打的去了售后；尼玛，周日苹果售后人超多啊！取号、等候，最后终于等到我了。维修师傅接过电脑，我向他描述了问题所在，然后他按几下快捷键说 ...</p> <a class="btn btn-info xsmall" href="./life/my_mac_repair.html">read more</a></div>
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