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<article id="post-oracle数据迁移之数据泵" class="article article-type-post" itemscope itemprop="blogPost">
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<a href="/2019/10/17/oracle数据迁移之数据泵/" class="article-date">
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<a class="article-title" href="/2019/10/17/oracle数据迁移之数据泵/">oracle数据迁移之数据泵</a>
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<h1 id="oracle数据迁移-——-数据泵的使用"><a href="#oracle数据迁移-——-数据泵的使用" class="headerlink" title="oracle数据迁移 —— 数据泵的使用"></a>oracle数据迁移 —— 数据泵的使用</h1><h2 id="导出数据库脚本"><a href="#导出数据库脚本" class="headerlink" title="导出数据库脚本"></a>导出数据库脚本</h2><ol>
<li><p>登录数据库，输入命令：<br>sqlplus sys as sysdba</p>
</li>
<li><p>创建目录路径，输入命令：</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">create</span> <span class="keyword">directory</span> data_dir <span class="keyword">as</span> E:\orcl\<span class="keyword">data</span><span class="string">';</span></span><br><span class="line"><span class="string">--使用 select * from dba_directories; 可查询用户创建的目录</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>为oracle用户授予访问目录的权限，输入命令：</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">grant</span> <span class="keyword">read</span>,write <span class="keyword">on</span> <span class="keyword">directory</span> data_dir <span class="keyword">to</span> pm52; <span class="comment">--用户名：pm52</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>导出数据库脚本（在cmd下执行）</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">expdp pm52/sa@mapletr directory=data_dir dumpfile=pm52.dmp log=pm52.log</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h2 id="导入数据库脚本"><a href="#导入数据库脚本" class="headerlink" title="导入数据库脚本"></a>导入数据库脚本</h2><ol>
<li><p>登录sysdba</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sqlplus sys@orcl/sa as sysdba</span><br></pre></td></tr></table></figure>
</li>
<li><p>创建表空间</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">create</span> <span class="keyword">tablespace</span> MTR_DATA <span class="keyword">datafile</span> <span class="string">'C:\oradata\orcl\MTR_DATA.dbf'</span> <span class="keyword">size</span> <span class="number">2000</span>m <span class="keyword">autoextend</span> <span class="keyword">on</span> <span class="keyword">next</span> <span class="number">200</span>m;</span><br><span class="line"><span class="keyword">create</span> <span class="keyword">tablespace</span> PM_DATA <span class="keyword">datafile</span> <span class="string">'C:\oradata\orcl\PM_DATA.dbf'</span> <span class="keyword">size</span> <span class="number">2000</span>m <span class="keyword">autoextend</span> <span class="keyword">on</span> <span class="keyword">next</span> <span class="number">200</span>m;</span><br><span class="line"><span class="keyword">create</span> <span class="keyword">tablespace</span> MTR_LOB <span class="keyword">datafile</span> <span class="string">'C:\oradata\orcl\MTR_LOB.dbf'</span> <span class="keyword">size</span> <span class="number">2000</span>m <span class="keyword">autoextend</span> <span class="keyword">on</span> <span class="keyword">next</span> <span class="number">200</span>m;</span><br><span class="line"><span class="keyword">create</span> <span class="keyword">tablespace</span> MTR_IDX <span class="keyword">datafile</span> <span class="string">'C:\oradata\orcl\MTR_IDX.dbf'</span> <span class="keyword">size</span> <span class="number">2000</span>m <span class="keyword">autoextend</span> <span class="keyword">on</span> <span class="keyword">next</span> <span class="number">200</span>m;</span><br></pre></td></tr></table></figure>
</li>
<li><p>创建用户</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">create</span> <span class="keyword">user</span> PM52 <span class="keyword">identified</span> <span class="keyword">by</span> <span class="string">"sa"</span> <span class="keyword">default</span> <span class="keyword">tablespace</span> PM_DATA <span class="keyword">temporary</span></span><br><span class="line"><span class="keyword">tablespace</span> TEMP;</span><br><span class="line"></span><br><span class="line"><span class="keyword">grant</span> <span class="keyword">connect</span>,<span class="keyword">resource</span>,dba,ctxapp <span class="keyword">to</span> PM52;</span><br><span class="line"></span><br><span class="line"><span class="keyword">grant</span> <span class="keyword">select</span> <span class="keyword">any</span> <span class="keyword">table</span>,<span class="keyword">delete</span> <span class="keyword">any</span> <span class="keyword">table</span>,<span class="keyword">update</span> <span class="keyword">any</span> <span class="keyword">table</span>,<span class="keyword">insert</span> <span class="keyword">any</span> <span class="keyword">table</span>,<span class="keyword">create</span> <span class="keyword">view</span> <span class="keyword">to</span> PM52;</span><br></pre></td></tr></table></figure>
</li>
<li><p>创建目录，并授权</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">create</span> <span class="keyword">directory</span> dir <span class="keyword">as</span> <span class="string">'c:\db'</span>;</span><br><span class="line"><span class="keyword">grant</span> <span class="keyword">read</span>,write <span class="keyword">on</span> <span class="keyword">directory</span> dir <span class="keyword">to</span> PM52;</span><br></pre></td></tr></table></figure>
</li>
<li><p>导入数据库</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">impdp PM52/sa@orcl directory=dir remap_schema=PM52:PM52 dumpfile=PM52.DMP logfile=PM52.log;</span><br></pre></td></tr></table></figure>
</li>
<li><p>编译未通过的函数、视图、同义词</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></pre></td><td class="code"><pre><span class="line">var aa varchar2(500);</span><br><span class="line"><span class="keyword">begin</span> </span><br><span class="line">P_Compiledbobj(<span class="number">1</span>,<span class="string">'PM52'</span>,:aa);</span><br><span class="line"><span class="keyword">end</span>;</span><br><span class="line">/</span><br><span class="line">print aa;</span><br></pre></td></tr></table></figure>
</li>
<li><p>多个表空间的问题</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">impdp PM52/sa@orcl directory=dir remap_schema=PM52:PM52 dumpfile=PM52.DMP logfile=PM52.log remap_tablespace='(PM_DATA:PM_DATA,PM_LOB:PM_LOB,PM_IDX:PM_IDX)';</span><br></pre></td></tr></table></figure></li>
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<li>根据某些个字段进行去重<figure class="highlight c#"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> IEnumerable<TSource> DistinctBy<TSource, TKey> (<span class="keyword">this</span> IEnumerable<TSource> source, Func<TSource, TKey> keySelector)</span><br><span class="line">{</span><br><span class="line"> HashSet<TKey> seenKeys = <span class="keyword">new</span> HashSet<TKey>();</span><br><span class="line"> <span class="keyword">foreach</span> (TSource element <span class="keyword">in</span> source)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">if</span> (seenKeys.Add(keySelector(element)))</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">yield</span> <span class="keyword">return</span> element;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<a class="article-title" href="/2019/03/27/前端text树形文本转树形json/">前端text树形文本转树形json</a>
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<figure class="highlight html"><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><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><!DOCTYPE html></span></span><br><span class="line"><span class="tag"><<span class="name">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">"Content-Type"</span> <span class="attr">content</span>=<span class="string">"text/html; charset=utf-8"</span> /></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span><span class="tag"></<span class="name">title</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">script</span> <span class="attr">src</span>=<span class="string">"/js/jquery.js"</span>></span><span class="tag"></<span class="name">script</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span> /></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br><span class="line"><span class="tag"><<span class="name">body</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">textarea</span> <span class="attr">id</span>=<span class="string">"txtarea"</span> <span class="attr">rows</span>=<span class="string">"6"</span>></span><span class="tag"></<span class="name">textarea</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">input</span> <span class="attr">type</span>=<span class="string">"button"</span> <span class="attr">onclick</span>=<span class="string">"convertToJson()"</span> <span class="attr">value</span>=<span class="string">"转换"</span> /></span></span><br><span class="line"> <span class="tag"><<span class="name">textarea</span> <span class="attr">id</span>=<span class="string">"txtarearesult"</span> <span class="attr">rows</span>=<span class="string">"6"</span>></span><span class="tag"></<span class="name">textarea</span>></span></span><br><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br><span class="line"><span class="tag"></<span class="name">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">script</span>></span></span><br><span class="line"><span class="javascript"> <span class="function"><span class="keyword">function</span> <span class="title">convertToJson</span>(<span class="params"></span>) </span>{</span></span><br><span class="line"><span class="javascript"> <span class="keyword">var</span> val = $(<span class="string">"#txtarea"</span>).val();</span></span><br><span class="line"><span class="javascript"> <span class="keyword">var</span> lines = val.split(<span class="string">'\n'</span>);</span></span><br><span class="line"><span class="javascript"> <span class="keyword">var</span> preNode = {};</span></span><br><span class="line"><span class="javascript"> <span class="keyword">var</span> resultJson = [];</span></span><br><span class="line"><span class="javascript"> <span class="keyword">for</span> (<span class="keyword">var</span> i = <span class="number">0</span>; i < lines.length; i++) {</span></span><br><span class="line"><span class="javascript"> <span class="keyword">var</span> line = lines[i];</span></span><br><span class="line"><span class="javascript"> <span class="keyword">var</span> lastIndex = line.lastIndexOf(<span class="string">"+"</span>);</span></span><br><span class="line"><span class="javascript"> <span class="keyword">var</span> text = line.substr(lastIndex + <span class="number">1</span>, line.length);</span></span><br><span class="line"><span class="javascript"> <span class="keyword">var</span> currentNode = { <span class="attr">text</span>: text, <span class="attr">value</span>: text, <span class="attr">level</span>: lastIndex, <span class="attr">children</span>: [] };</span></span><br><span class="line"><span class="javascript"> <span class="keyword">if</span> (lastIndex == <span class="number">-1</span>) {</span></span><br><span class="line"> resultJson.push(currentNode);</span><br><span class="line"><span class="javascript"> } <span class="keyword">else</span> <span class="keyword">if</span> (lastIndex > preNode.level) {</span></span><br><span class="line"> preNode.children.push(currentNode);</span><br><span class="line"><span class="javascript"> } <span class="keyword">else</span> {</span></span><br><span class="line"><span class="javascript"> <span class="keyword">var</span> node = getNodeBylevel(resultJson, lastIndex - <span class="number">1</span>);</span></span><br><span class="line"><span class="javascript"> <span class="keyword">if</span> (node) {</span></span><br><span class="line"> node.children.push(currentNode);</span><br><span class="line"><span class="javascript"> } <span class="keyword">else</span> {</span></span><br><span class="line"> resultJson.push(currentNode);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> preNode = currentNode;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"><span class="javascript"> $(<span class="string">"#txtarearesult"</span>).val(<span class="built_in">JSON</span>.stringify(resultJson));</span></span><br><span class="line"><span class="javascript"> <span class="comment">//alert(val);</span></span></span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"><span class="javascript"> <span class="function"><span class="keyword">function</span> <span class="title">getNodeBylevel</span>(<span class="params">nodes, level</span>) </span>{</span></span><br><span class="line"><span class="javascript"> <span class="keyword">if</span> (nodes && nodes[<span class="number">0</span>].level == level) {</span></span><br><span class="line"><span class="javascript"> <span class="keyword">return</span> nodes[nodes.length - <span class="number">1</span>];</span></span><br><span class="line"><span class="javascript"> } <span class="keyword">else</span> {</span></span><br><span class="line"><span class="javascript"> <span class="keyword">return</span> getNodeBylevel(nodes[nodes.length - <span class="number">1</span>].children, level);</span></span><br><span class="line"> }</span><br><span class="line"> };</span><br><span class="line"><span class="tag"></<span class="name">script</span>></span></span><br></pre></td></tr></table></figure>
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<a class="article-title" href="/2018/11/20/python-blog/">Python系统学习指南</a>
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<h2 id="Python系统学习指南"><a href="#Python系统学习指南" class="headerlink" title="Python系统学习指南"></a>Python系统学习指南</h2><h3 id="1、系统学习python的博客"><a href="#1、系统学习python的博客" class="headerlink" title="1、系统学习python的博客"></a>1、<a href="https://www.cnblogs.com/adc8868/archive/2016/05.html" target="_blank" rel="noopener">系统学习python的博客</a></h3><ul>
<li>简述：由浅入深，从简单语法到复杂功能实现</li>
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<a class="article-title" href="/2018/11/07/C#大文件上传/">C#大文件上传</a>
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<figure class="highlight csharp"><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><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">string</span> <span class="title">MyUploader</span> (<span class="params"><span class="keyword">string</span> strFileToUpload, <span class="keyword">string</span> strUrl， Action<<span class="keyword">double</span>, <span class="keyword">double</span>> uploading</span>)</span> {</span><br><span class="line"> <span class="keyword">string</span> strFileFormName = <span class="string">"file"</span>;</span><br><span class="line"> Uri oUri = <span class="keyword">new</span> Uri (strUrl);</span><br><span class="line"> <span class="keyword">string</span> strBoundary = <span class="string">"----------"</span> + DateTime.Now.Ticks.ToString (<span class="string">"x"</span>);</span><br><span class="line"> <span class="comment">// The trailing boundary</span></span><br><span class="line"> <span class="keyword">string</span> <span class="keyword">byte</span>[] boundaryBytes = Encoding.ASCII.GetBytes (<span class="string">"\r\n--"</span> + strBoundary + <span class="string">"--\r\n"</span>);</span><br><span class="line"> <span class="comment">//**注意此处的 strBoundary后的换行前加上--，不然会异常** </span></span><br><span class="line"> <span class="comment">// The post message header </span></span><br><span class="line"> StringBuilder sb = <span class="keyword">new</span> StringBuilder ();</span><br><span class="line"> sb.Append (<span class="string">"--"</span>);</span><br><span class="line"> sb.Append (strBoundary);</span><br><span class="line"> sb.Append (<span class="string">"\r\n"</span>);</span><br><span class="line"> sb.Append (<span class="string">"Content-Disposition: form-data; name=\""</span>);</span><br><span class="line"> sb.Append (strFileFormName);</span><br><span class="line"> sb.Append (<span class="string">"\"; filename=\""</span>);</span><br><span class="line"> sb.Append (Path.GetFileName (strFileToUpload));</span><br><span class="line"> sb.Append (<span class="string">"\""</span>);</span><br><span class="line"> sb.Append (<span class="string">"\r\n"</span>);</span><br><span class="line"> sb.Append (<span class="string">"Content-Type: "</span>);</span><br><span class="line"> sb.Append (<span class="string">"application/octet-stream"</span>);</span><br><span class="line"> sb.Append (<span class="string">"\r\n"</span>);</span><br><span class="line"> sb.Append (<span class="string">"\r\n"</span>);</span><br><span class="line"> <span class="keyword">string</span> strPostHeader = sb.ToString ();</span><br><span class="line"> <span class="keyword">byte</span>[] postHeaderBytes = Encoding.UTF8.GetBytes (strPostHeader);</span><br><span class="line"> <span class="comment">// The WebRequest </span></span><br><span class="line"> HttpWebRequest oWebrequest = (HttpWebRequest) WebRequest.Create (oUri);</span><br><span class="line"> oWebrequest.ContentType = <span class="string">"multipart/form-data; boundary="</span> + strBoundary;</span><br><span class="line"> oWebrequest.Method = <span class="string">"POST"</span>;</span><br><span class="line"> <span class="comment">// This is important, otherwise the whole file will be read to memory anyway... </span></span><br><span class="line"> oWebrequest.AllowWriteStreamBuffering = <span class="literal">false</span>;</span><br><span class="line"> <span class="comment">// Get a FileStream and set the final properties of the WebRequest</span></span><br><span class="line"> FileStream oFileStream = <span class="keyword">new</span> FileStream (strFileToUpload, FileMode.Open, FileAccess.Read);</span><br><span class="line"> <span class="keyword">long</span> length = postHeaderBytes.Length + oFileStream.Length + boundaryBytes.Length;</span><br><span class="line"> oWebrequest.ContentLength = length;</span><br><span class="line"> Stream oRequestStream = oWebrequest.GetRequestStream ();</span><br><span class="line"> <span class="comment">// Write the post header </span></span><br><span class="line"> oRequestStream.Write (postHeaderBytes, <span class="number">0</span>, postHeaderBytes.Length);</span><br><span class="line"> <span class="comment">// Stream the file contents in small pieces (4096 bytes, max).</span></span><br><span class="line"> <span class="keyword">byte</span>[] buffer = <span class="keyword">new</span> Byte[<span class="keyword">checked</span> ((<span class="keyword">uint</span>) Math.Min (<span class="number">4096</span>, (<span class="keyword">int</span>) oFileStream.Length))];</span><br><span class="line"> <span class="keyword">int</span> bytesRead = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">double</span> size = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">while</span> ((bytesRead = oFileStream.Read (buffer, <span class="number">0</span>, buffer.Length)) != <span class="number">0</span>) { oRequestStream.Write (buffer, <span class="number">0</span>, bytesRead); size += bytesRead; <span class="keyword">if</span> (uploading != <span class="literal">null</span>) uploading (length, size); }</span><br><span class="line"> oFileStream.Close ();</span><br><span class="line"> <span class="comment">// Add the trailing boundary </span></span><br><span class="line"> oRequestStream.Write (boundaryBytes, <span class="number">0</span>, boundaryBytes.Length);</span><br><span class="line"> WebResponse oWResponse = oWebrequest.GetResponse ();</span><br><span class="line"> Stream s = oWResponse.GetResponseStream ();</span><br><span class="line"> StreamReader sr = <span class="keyword">new</span> StreamReader (s);</span><br><span class="line"> String sReturnString = sr.ReadToEnd ();</span><br><span class="line"> <span class="comment">// Clean up </span></span><br><span class="line"> oFileStream.Close ();</span><br><span class="line"> oRequestStream.Close ();</span><br><span class="line"> s.Close ();</span><br><span class="line"> sr.Close ();</span><br><span class="line"> <span class="keyword">return</span> sReturnString;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>原文：<a href="https://blog.csdn.net/u012790747/article/details/46052519" target="_blank" rel="noopener">https://blog.csdn.net/u012790747/article/details/46052519</a> </p>
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<a class="article-title" href="/2018/11/07/文件流/">C#文件流</a>
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<p>一、文件流</p>
<p>FileStream类主要用于读写磁盘文件。常用于向磁盘存储数据或读取配置文件。</p>
<p>读取文件：</p>
<figure class="highlight csharp"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">//文件流：读取</span></span><br><span class="line">FileStream fileStream = File.Open(<span class="string">@"D:\test.txt"</span>, FileMode.Open);<span class="comment">//初始化文件流</span></span><br><span class="line"><span class="keyword">byte</span>[] array = <span class="keyword">new</span> <span class="keyword">byte</span>[fileStream.Length];<span class="comment">//初始化字节数组，用来暂存读取到的字节</span></span><br><span class="line">fileStream.Read(array, <span class="number">0</span>, array.Length);<span class="comment">//读取流中数据，写入到字节数组中</span></span><br><span class="line">fileStream.Close(); <span class="comment">//关闭流</span></span><br><span class="line"><span class="keyword">string</span> str = Encoding.Default.GetString(array);<span class="comment">//将字节数组内容转化为字符串</span></span><br><span class="line">Response.Write(str);</span><br></pre></td></tr></table></figure>
<p>写入文件：</p>
<figure class="highlight csharp"><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="comment">//文件流：写入</span></span><br><span class="line">FileStream fileStream = File.Open(<span class="string">@"D:\test.txt"</span>,FileMode.Append);<span class="comment">//初始化文件流</span></span><br><span class="line"><span class="keyword">byte</span>[] array = Encoding.Default.GetBytes(<span class="string">"哈哈123abc"</span>);<span class="comment">//给字节数组赋值</span></span><br><span class="line">fileStream.Write(array, <span class="number">0</span>, array.Length);<span class="comment">//将字节数组写入文件流</span></span><br><span class="line">fileStream.Close();<span class="comment">//关闭流</span></span><br></pre></td></tr></table></figure>
<p>二、网络流</p>
<p>NetWorkStream类是专门用来处理服务器与客户端通信的流。它在网络编程中经常使用，主要是用来处理类似Socket、TcpClient和TcpListener这些类中得到的流。</p>
<p>单的TCP同步方式，服务器与客户端通信：</p>
<p>服务器</p>
<figure class="highlight csharp"><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></pre></td><td class="code"><pre><span class="line">TcpListener lis=<span class="keyword">new</span> TcpListener(<span class="number">5000</span>); <span class="comment">//服务器监听</span></span><br><span class="line">lis.Start();<span class="comment">//启动</span></span><br><span class="line">Socket sock=lis.AcceptSocket();<span class="comment">//阻塞，直到有客户端连接</span></span><br><span class="line"></span><br><span class="line">NetworkStream networkStream = <span class="keyword">new</span> NetworkStream(sock);<span class="comment">//得到Socket中的流</span></span><br><span class="line"><span class="keyword">if</span> (netStream.DataAvailable) <span class="comment">//如果客户端发送了消息</span></span><br><span class="line">{</span><br><span class="line"> <span class="keyword">byte</span>[] data = <span class="keyword">new</span> <span class="keyword">byte</span>[<span class="number">1024</span>]; <span class="comment">//定义一个字节数组，用来存放接收的数据</span></span><br><span class="line"> <span class="keyword">int</span> len = netStream.Read(data, <span class="number">0</span>, data.Length); <span class="comment">//从位置开始，读取到字节数组末尾</span></span><br><span class="line"> <span class="keyword">string</span> line = Encoding.Default.GetString(data, <span class="number">0</span>, len); <span class="comment">//把收到的字节转换为字符串</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>客户端</p>
<figure class="highlight csharp"><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">TcpClient client = <span class="keyword">new</span> TcpClient();<span class="comment">//客户端tcp对象</span></span><br><span class="line">client.Connect(<span class="string">"127.0.0.1"</span>, <span class="number">5000</span>);<span class="comment">//连接服务器</span></span><br><span class="line">NetworkStream myStream = client.GetStream();<span class="comment">//得到网络流</span></span><br><span class="line"> </span><br><span class="line"><span class="keyword">byte</span>[] data = Encoding.Default.GetBytes(<span class="string">"Hi，你好"</span>); <span class="comment">//首先把输入的字符串消息转换为字节</span></span><br><span class="line">myStream .Write(data, <span class="number">0</span>, data.Length); <span class="comment">//向myStream 里写入数据</span></span><br><span class="line">myStream .Flush(); <span class="comment">//刷新流中的数据</span></span><br><span class="line">myStream .Close();</span><br></pre></td></tr></table></figure>
<p>三、内存流</p>
<p>MemoryStream类主要用于操作内存中的数据。比如说网络中传输数据时可以用流的形式，当我们收到这些流数据时就可以声明MemoryStream类来存储并且处理它们。</p>
<p>MemoryStream操作字符串：</p>
<figure class="highlight csharp"><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="keyword">string</span> str = <span class="string">"Hi!你好！"</span>;</span><br><span class="line"><span class="keyword">byte</span>[] array = Encoding.UTF8.GetBytes(str);<span class="comment">//将字符串转化为字节数组</span></span><br><span class="line">MemoryStream memory = <span class="keyword">new</span> MemoryStream(array);<span class="comment">//初始化MemoryStream类</span></span><br><span class="line"><span class="keyword">byte</span>[] arrayNew = memory.ToArray();<span class="comment">//将内存中的数据转换为字节数组</span></span><br><span class="line"><span class="keyword">string</span> strNew = Encoding.UTF8.GetString(arrayNew);<span class="comment">//将字节数组转换为字符串</span></span><br></pre></td></tr></table></figure>
<p> 四、StreamReader/StreamWriter</p>
<p>StreamReader/StreamWriter主要用来处理流数据。它们分别提供了高效的流读取/写入功能。</p>
<p>读取：</p>
<figure class="highlight csharp"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">//StreamReader 读取</span></span><br><span class="line">StreamReader reader = <span class="keyword">new</span> StreamReader(<span class="string">@"D:\test.txt"</span>,Encoding.Default);<span class="comment">//初始化读取 设置编码格式，否则中文会乱码</span></span><br><span class="line"><span class="keyword">string</span> readStr = reader.ReadLine();<span class="comment">//从流中读取一行 reader.ReadToEnd()读取全部</span></span><br><span class="line">reader.Close();<span class="comment">//关闭流</span></span><br></pre></td></tr></table></figure>
<p>写入：</p>
<figure class="highlight csharp"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">//StreamWriter 写入</span></span><br><span class="line">StreamWriter writer = <span class="keyword">new</span> StreamWriter(<span class="string">@"D:\test1.txt"</span>);<span class="comment">//初始化写入</span></span><br><span class="line">writer.WriteLine(<span class="string">"Hi 你好123"</span>);<span class="comment">//写入一行</span></span><br><span class="line">writer.Close();</span><br></pre></td></tr></table></figure>
<p>五、TextReader/TextWriter</p>
<p>TextReader/TextWriter类主要用来处理流数据。它们分别提供了高效的文本流读取/写入功能。</p>
<figure class="highlight csharp"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">//TextReader/Writer读写</span></span><br><span class="line">TextReader textReader = <span class="keyword">new</span> StringReader(<span class="string">"Hi 你好"</span>);<span class="comment">//初始化读取流</span></span><br><span class="line">TextWriter textWriter = <span class="keyword">new</span> StringWriter();<span class="comment">//初始化写入流</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">char</span>[] c=<span class="keyword">new</span> <span class="keyword">char</span>[<span class="number">4096</span>];</span><br><span class="line"><span class="keyword">int</span> chars = <span class="number">0</span>;</span><br><span class="line"><span class="keyword">while</span> ((chars = textReader.Read(c, <span class="number">0</span>, <span class="number">4096</span>)) > <span class="number">0</span>)<span class="comment">//把流中数据写入到字符数组中 读取流中数据</span></span><br><span class="line">{</span><br><span class="line"> textWriter.Write(c, <span class="number">0</span>, <span class="number">4096</span>);<span class="comment">//从字符数组中读取流</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">string</span> str= textWriter.ToString();<span class="comment">//将流中数据写到字符串中</span></span><br><span class="line">textReader.Close();<span class="comment">//关闭流</span></span><br><span class="line">textWriter.Close();</span><br></pre></td></tr></table></figure>
<p>注意事项：</p>
<p>1.流使用后必须要关闭。</p>
<p>2.把流中数据加载到内存时要考虑内存溢出等问题。</p>
<p>文章来源>><a href="https://www.cnblogs.com/Johnny_Z/archive/2011/09/12/2174148.html" target="_blank" rel="noopener">https://www.cnblogs.com/Johnny_Z/archive/2011/09/12/2174148.html</a></p>
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<article id="post-docker的使用" class="article article-type-post" itemscope itemprop="blogPost">
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<p>1、Docker的安装步骤：</p>
<ul>
<li>在bios中打开电脑的虚拟化功能</li>
<li>从系统的 “启用或关闭Windows功能”，启用Hyper-V功能</li>
<li>安装Docker</li>
</ul>
<p>2、在项目文件夹创建文件 Dockerfile【注意文件名字】，添加以下内容：</p>
<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><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">#添加基础镜像</span><br><span class="line">FROM microsoft/dotnet:2.1-aspnetcore-runtime</span><br><span class="line">#容器中系统的工作空间</span><br><span class="line">WORKDIR /app</span><br><span class="line">#拷贝当前文件夹下的文件到容器中系统的工作空间</span><br><span class="line">COPY . /app </span><br><span class="line">#设置Docker容器对外暴露的端口</span><br><span class="line">EXPOSE 80</span><br><span class="line">#容器中使用 ["dotnet","系统启动的dll"] 来运行应用程序</span><br><span class="line">#使用ENTRYPOINT ["dotnet","系统启动的dll"]</span><br><span class="line">#或使用 CMD ["dotnet","系统启动的dll"]</span><br><span class="line">ENTRYPOINT ["dotnet", "mapletr.dll"]</span><br></pre></td></tr></table></figure>
<p>3、执行生成镜像命令。<br>docker build -t mapletr:1.0.0 .<br>注意镜像名称后边的 . （mapletr：1.0.0是标识镜像名称和版本信息）<br>此时将下载Asp.Net Core 2.1-aspnetcore-runtime 基础镜像，并运行Dockerfile中的后续指令</p>
<p>4、创建并启动容器<br>docker run –name mapletr -p 80:80 mapletr</p>
<p>5、停止容器<br>docker stop mapletr</p>
<p>6、重启容器<br>docker start mapletr</p>
<p>7、删除容器（先停止，才能删除）<br>docker rm mapletr</p>
<p>8、导出镜像<br>docker export mapletr>d:/mapletr.tar</p>
<p>9、导入镜像<br>docker import -mapletr<d:/mapletr.tar</p>
<p>10、保存镜像<br>docker save -o d:/mapletr1.tar mapletr</p>
<p>11、加载镜像<br>docker load -i d:/mapletr1.tar</p>
<p>12、查看所有的镜像<br>docker images</p>
<p>13、查看所有的容器<br>docker ps -a</p>
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<ul>
<li><a href="https://packagesearch.azurewebsites.net/" target="_blank" rel="noopener">packagesearch工具</a>，可以快速定位某个API在哪个Nuget包中</li>
<li>修改工程文件csproj可以使项目支持多个目标框架<figure class="highlight c#"><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"><Project Sdk=<span class="string">"Microsoft.NET.Sdk"</span>></span><br><span class="line"> <PropertyGroup></span><br><span class="line"> <TargetFrameworks>netstandard1<span class="number">.4</span>;netcoreapp1<span class="number">.0</span>;net45</TargetFrameworks></span><br><span class="line"> </PropertyGroup></span><br><span class="line"></Project></span><br></pre></td></tr></table></figure>
</li>
</ul>
<hr>
<p>以下是常见的条件编译符号列表:<br>**<br>.NET Framework 2.0 –> NET20<br>.NET Framework 3.5 –> NET35<br>.NET Framework 4.0 –> NET40<br>.NET Framework 4.5 –> NET45<br>.NET Framework 4.5.1 –> NET451<br>.NET Framework 4.5.2 –> NET452<br>.NET Framework 4.6 –> NET46<br>.NET Framework 4.6.1 –> NET461<br>.NET Framework 4.6.2 –> NET462<br>.NET Standard 1.0 –> NETSTANDARD1_0<br>.NET Standard 1.1 –> NETSTANDARD1_1<br>.NET Standard 1.2 –> NETSTANDARD1_2<br>.NET Standard 1.3 –> NETSTANDARD1_3<br>.NET Standard 1.4 –> NETSTANDARD1_4<br>.NET Standard 1.5 –> NETSTANDARD1_5<br>.NET Standard 1.6 –> NETSTANDARD1_6</p>
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