主要内容

解析HTML并提取文本内容

这个示例展示了如何解析HTML代码并从特定元素中提取文本内容。

解析HTML代码

从URL读取HTML代码//www.tatmou.com/help/textanalytics.使用webread

URL =.“//www.tatmou.com/help/textanalytics”;代码= webread (url);

使用。解析HTML代码htmlTree

树= htmlTree(代码);

查看树的HTML元素名。

树。名称
ans =“HTML”

查看树的子元素。子树是

树。孩子们
ans = 4×1 htmltree:“” 文本分析工具箱文档</ title> <meta charset =“utf-8”/> <meta content =“width = device-width,初始标度= 1.0“名称=”视口“/> <meta content =”IE = Edge“HTTP-EQUIV =”X-UA兼容“/> <链接HREF =”/包含_CONTENT /响应/ CSS / Bootstrap / Bootstrap.min.css“rel =“stylesheet”类型=“text / css”/> <link href =“/ compant_content /响应/ css / site6.css?20180314”rel =“stylesh表”类型=“text / css”/> <链接href =“/includes_content/responsive/css/site6_lg.css?20180314”media =“屏幕和(min-width:1200px)”rel =“样式表”/> <link href =“/ compress_content /响应/ css / site6_md.css?20180314“Media =”屏幕和(min-宽度:992px)和(max-width:1199px)“rel =”styleshing“/> <link href =”/ complity_content /响应/ css / site6_sm + xs.css?20180314“媒体=“屏幕和(max-widey:991px)”rel =“样式表”/> <link href =“/ compantic_content /响应/ css / site6_sm.css?20180314”Media =“屏幕(min-width:768px)(max-widey:991px)“rel =”样式表“/> <link href =”/包含Udes_content /响应/ ......“<body id =”responsion_offcanvas“> <! -  mobile topnav:start  - > <div类=”header visible-xs可见 -  sm“id =”header_mobile“translate =”否“><nav类=“navbar navbar-default”角色=“导航”> <div类=“容器流体”> <div类=“行”> <div类=“col-xs-12”> <div类=“NavBar-header”> <按钮类=“Navbar-toggle topnav_toggle”data-target =“#topnav_collapse”data-toggle =“collapse”type =“按钮”> <span class =“stl-loct”>切换主导航</ span> <span class =“图标菜单”/> </ button> <a class="svg_link nambar-brand" href="//www.tatmou.com/jp/help/textanalytics/ug/htps.com?s_tid=gn_logo"> <img alt=“Mathworks”类=“mw_logo”src =“/图像/响应/ global / pic-header-mathworks-logo.svg”/> </a> </ div> </ div> </ div> <div类=“行visible-xs可见-sm”> <div类=“col-xs-12”> <div类=“navbar-collapse折叠”ID =“topnav_colly”> <ul class =“nav navbar-nav”ID=“topnav”> <li class =“headernav_login”> <a class =“mwa-nav_login”href =“//www.tatmou.com/login?uri=//www.tatmou.com/help/textanalytics / index.html“>标志...</pre>
              </div>
             </div>
            </div>
            <h3 class="title" id="ParseHTMLAndExtractTextContentExample-2">从HTML树提取文本</h3>
            <p>要直接从HTML树中提取文本,请使用<code class="literal">extractHTMLText</code>.</p>
            <div class="code_responsive">
             <div class="programlisting">
              <div class="codeinput">
               <pre>str = extractHTMLText(树)</pre>
              </div>
             </div>
            </div>
            <div class="code_responsive">
             <div class="programlisting">
              <div class="codeoutput">
               <pre>str =“Text Inalytics Toolbox™提供用于预处理,分析和建模文本数据的算法和可视化。使用工具箱创建的型号可以在情感分析,预测性维护和主题建模等应用中使用。文本分析工具箱包括用于处理的工具来自设备日志,新闻源,调查,运营商报告和社交媒体等来源的原始文本。您可以从流行的文件格式,预处理原始文本中提取文本,提取单个单词,将文本转换为数字表示,并构建统计模型。使用LSA,LDA和Word Embeddings等机器学习技术,您可以找到群集并从高维文本数据集创建功能。使用文本分析工具箱创建的功能可以与其他数据源的功能组合,以构建机器学习模型文本,数字和其他类型的数据。“</pre>
              </div>
             </div>
            </div>
            <h3 class="title" id="ParseHTMLAndExtractTextContentExample-3">找到HTML元素</h3>
            <p>找到HTML树的特定元素,使用<code class="literal">Fedelement.</code>.在HTML树中找到所有超链接。在HTML中,超链接使用“A”标签。</p>
            <div class="code_responsive">
             <div class="programlisting">
              <div class="codeinput">
               <pre>选择器=<span style="color:#A020F0">“一种”</span>;子树= findElement(树,选择器);</pre>
              </div>
             </div>
            </div>
            <p>查看前几个子树。</p>
            <div class="code_responsive">
             <div class="programlisting">
              <div class="codeinput">
               <pre>子树(1:20)</pre>
              </div>
             </div>
            </div>
            <div class="code_responsive">
             <div class="programlisting">
              <div class="codeoutput">
               <pre>ans = 20×1 htmlTree:< class = " svg_link navbar-brand " href = " //www.tatmou.com?s_tid=gn_logo " > < IMG alt = " MathWorks " class = " mw_logo " src = " /图片/响应全球/ pic-header-mathworks-logo.svg " / > < / > < class = " mwa-nav_login " href = " //www.tatmou.com/login?uri=http: / / www.tatmou.com/help/textanalytics/index.html " >在< / > <迹象产品href = " https://www.mathworks下载188bet金宝搏.com/products.html?s_tid=gn_ps " > < / > < A href = " https://www.mathworks金宝搏官方网站.com/solutions.html?s_tid=gn_sol " >解决方案< / > < A href = " //www.tatmou.com/academia.html?s_tid=gn_acad " >学术界< / > < A href = "金宝app //www.tatmou.com/support.html?s_tid=gn_supp " > < / > <支持社区href = " //www.tatmou.com/matlabcentral/?s_tid=gn_mlc " > < / > < A href = " //www.tatmou.com/company/events.html?s_tid=gn_ev " >事件< / > < A href = " //www.tatmou.com/company/aboutus/contact_us.html?s_tid=gn_cntus " >联系我们< / > < A href = " //www.tatmou.com/store?s_cid=store_top_nav& s_tid = gn_store " > < / > <买href="//www.tatmou.com/jp/company/aboutus/contact_us.html?s_tid=gn_cntus">Contact Us</A> <A href="//www.tatmou.com/jp/store?s_cid=store_top_nav&s_tid=gn_store">How to Buy</A> <A class="mwa-nav_login" href="//www.tatmou.com/jp/login?uri=/help/textanalytics/index.html">Sign In</A> <A class="svg_link pull-left" href="//www.tatmou.com/jp/?s_tid=gn_logo"><IMG alt="MathWorks" class="mw_logo" src="//www.tatmou.com/jp/images/responsive/global/pic-header-mathworks-logo.svg"/></A> <A href="//www.tatmou.com/jp/products.html?s_tid=gn_ps">Products</A> <A href="//www.tatmou.com/jp/solutions.html?s_tid=gn_sol">Solutions</A> <A href="//www.tatmou.com/jp/academia.html?s_tid=gn_acad">Academia</A> <A href="//www.tatmou.com/jp/support.html?s_tid=gn_supp">Support</A> <A href="//www.tatmou.com/jp/matlabcentral/?s_tid=gn_mlc">Community</A> <A href="//www.tatmou.com/jp/company/events.html?s_tid=gn_ev">Events</A></pre>
              </div>
             </div>
            </div>
            <p>从超链接的文本创建一个单词云。</p>
            <div class="code_responsive">
             <div class="programlisting">
              <div class="codeinput">
               <pre>str = extracthtmltext(子树);图WordCloud(str);标题(<span style="color:#A020F0">“超链接”</span>)</pre>
              </div>
             </div>
            </div>
            <div class="informalfigure">
             <div id="d123e729" class="mediaobject">
              <p><img src="//www.tatmou.com/jp/help/examples/textanalytics/win64/ParseHTMLAndExtractTextContentExample_01.png" alt="" width="560" style="width: 560px"></p>
             </div>
            </div>
            <h3 class="title" id="ParseHTMLAndExtractTextContentExample-4">获取HTML属性</h3>
            <p>从HTML树中的段落元素中获取类属性。</p>
            <div class="code_responsive">
             <div class="programlisting">
              <div class="codeinput">
               <pre>子树= findElement(树,<span style="color:#A020F0">“p”</span>);attr =<span style="color:#A020F0">“班级”</span>;str = getAttribute(attrees,attr)</pre>
              </div>
             </div>
            </div>
            <div class="code_responsive">
             <div class="programlisting">
              <div class="codeoutput">
               <pre>str =<span class="emphasis"><em>21日×1的字符串数组</em></span><缺失> <缺失>“add_margin_5”<缺失> <缺失> <缺失> <缺失> <缺失> <category_desc“”category_desc“”category_desc“<缺失> <缺失> <缺失> <缺失>”文本中心“<缺少> <缺失> <缺失>“版权”<缺失></pre>
              </div>
             </div>
            </div>
            <p>从包含类中包含的文本中包含的文本中创建一个单词云<code class="literal">“category_desc”</code>.</p>
            <div class="code_responsive">
             <div class="programlisting">
              <div class="codeinput">
               <pre>子树= findElement(树,<span style="color:#A020F0">“p.category_desc”</span>);str = extracthtmltext(子树);图WordCloud(str);</pre>
              </div>
             </div>
            </div>
            <div class="informalfigure">
             <div id="d123e748" class="mediaobject">
              <p><img src="//www.tatmou.com/jp/help/examples/textanalytics/win64/ParseHTMLAndExtractTextContentExample_02.png" alt="" width="560" style="width: 560px"></p>
             </div>
            </div>
           </div>
           <h2 id="d123e753">另请参阅</h2>
           <p><span itemscope itemtype="//www.tatmou.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tatmou.com/jp/help/textanalytics/ref/htmltree.html"><span itemprop="name"><code class="object">htmlTree</code></span></a></span>|<span itemscope itemtype="//www.tatmou.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tatmou.com/jp/help/textanalytics/ref/htmltree.findelement.html"><span itemprop="name"><code class="function">Fedelement.</code></span></a></span>|<span itemscope itemtype="//www.tatmou.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tatmou.com/jp/help/textanalytics/ref/htmltree.getattribute.html"><span itemprop="name"><code class="function">getAttribute.</code></span></a></span>|<span itemscope itemtype="//www.tatmou.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tatmou.com/jp/help/textanalytics/ref/htmltree.extracthtmltext.html"><span itemprop="name"><code class="function">extractHTMLText</code></span></a></span>|<span itemscope itemtype="//www.tatmou.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tatmou.com/jp/help/textanalytics/ref/tokenizeddocument.html"><span itemprop="name"><code class="object">令人畏缩的鳕文</code></span></a></span></p>
           <h2 id="d123e764">相关的话题</h2>
           <ul>
            <li><a href="//www.tatmou.com/jp/help/textanalytics/ug/prepare-text-data-for-analysis.html" class="a">准备文本数据进行分析</a></li>
            <li><a href="//www.tatmou.com/jp/help/textanalytics/ug/create-simple-text-model-for-classification.html" class="a">为分类创建简单的文本模型</a></li>
            <li><a href="//www.tatmou.com/jp/help/textanalytics/ug/visualize-text-data-using-word-clouds.html" class="a">使用Word云可视化文本数据</a></li>
            <li><a href="//www.tatmou.com/jp/help/textanalytics/ug/analyze-text-data-using-topic-models.html" class="a">使用主题模型分析文本数据</a></li>
            <li><a href="//www.tatmou.com/jp/help/textanalytics/ug/analyze-text-data-using-multi-word-phrases.html" class="a">使用多字词分析文本数据</a></li>
            <li><a href="//www.tatmou.com/jp/help/textanalytics/ug/classify-text-data-using-deep-learning.html" class="a">使用深度学习对文本数据进行分类</a></li>
            <li><a href="//www.tatmou.com/jp/help/textanalytics/ug/train-a-sentiment-classifier.html" class="a">训练情感分类器</a></li>
           </ul>
          </section>
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             <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
             <h2 class="modal-title">例を開く</h2>
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            <div class="modal-body" id="dialog-body">
             <p>この例の変更されたバージョンがあります。編集された方の例を開きますか吗?</p>
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            <div class="modal-footer">
             <a id="open-example-dialog-replace" class="btn btn_color_blue companion_btn" data-dismiss="modal">いいえ,変更されたバージョン上书します。</a>
             <a id="open-example-dialog-continue" class="btn btn_color_blue" data-dismiss="modal">はい</a>
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            <h2 class="modal-title">MATLABコマンド</h2>
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           <div class="modal-body" id="dialog-body">
            <p>次のMATLABコマンドに対応するリンクがクリックされました。</p>
            <pre id="dialog-matlab-command"></pre>
            <p>コマンドをMATLABコマンドウィンドウに入力して実行してください。WebブラウザーはMATLABコマンドをサポートしていません。</p>
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         <div id="country-select-container">
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             <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
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             <div class="row add_margin_40">
              <div class="col-xs-12">
               <h1 class="icon-globe icon_color_secondary" id="country-unselected-title">选择一个网站</h1>
               <p>选择一个网站,在那里获得翻译的内容,并看到当地的活动和优惠。根据您的位置,我们建议您选择:<strong class="recommended-country"></strong>.</p>
               <a href="//www.tatmou.com/jp/help/textanalytics/ug/#" id="recommended_domain_button" class="btn btn_color_blue containsResourceName resourceClass-button">选择<span class="recommended-country"></span>网站</a>
              </div>
             </div>
             <p>您还可以从以下列表中选择一个网站:</p>
             <div class="alert alert-warning" id="china_performance_alert" style="display:none;">
              <span class="alert_icon icon-alert-warning"></span>
              <h2>如何获得最佳的网站性能</h2>
              <p>选择中国网站(中文或英文)以获得最佳网站性能。其他MathWorks国家站点没有针对您所在位置的访问进行优化。</p>
             </div>
             <div class="row add_margin_30">
              <div class="col-sm-4 col-md-3">
               <h3 class="add_bottom_rule">美洲</h3>
               <ul class="list-unstyled">
                <li><a href="//www.tatmou.com/la" class="domain_selector_link" data-country-code="LA" data-subdomain="la" data-lang="es" data-default-lang="true" data-selected-text="América Latina" data-recommended-text="América Latina" data-do-not-rewrite="true">América拉丁</a>(Español)</li>
                <li><a href="//www.tatmou.com/jp/" class="domain_selector_link" data-country-code="CA" data-subdomain="www" data-lang="en" data-do-not-rewrite="true">加拿大</a>(英语)</li>
                <li><a href="//www.tatmou.com/jp/" class="domain_selector_link" data-country-code="US" data-subdomain="www" data-lang="en" data-default-lang="true" data-selected-text="United States" data-recommended-text="United States" data-do-not-rewrite="true">美国</a>(英语)</li>
               </ul>
              </div>
              <div class="col-sm-4 col-md-6">
               <h3 class="add_bottom_rule">欧洲</h3>
               <div class="row">
                <div class="col-xs-6 col-sm-12 col-md-6">
                 <ul class="list-unstyled add_margin_0_sm">
                  <li><a href="//www.tatmou.com/nl" class="domain_selector_link" data-country-code="BE" data-subdomain="nl" data-lang="en" data-do-not-rewrite="true">比利时</a>(英语)</li>
                  <li><a href="//www.tatmou.com/se" class="domain_selector_link" data-country-code="DK" data-subdomain="se" data-lang="en" data-do-not-rewrite="true">丹麦</a>(英语)</li>
                  <li><a href="//www.tatmou.com/de" class="domain_selector_link" data-country-code="DE" data-subdomain="de" data-lang="de" data-default-lang="true" data-selected-text="Deutschland" data-recommended-text="Deutschland" data-do-not-rewrite="true">德国</a>(德意志)</li>
                  <li><a href="//www.tatmou.com/es" class="domain_selector_link" data-country-code="ES" data-subdomain="es" data-lang="es" data-default-lang="true" data-selected-text="España" data-recommended-text="España" data-do-not-rewrite="true">España.</a>(Español)</li>
                  <li><a href="//www.tatmou.com/se" class="domain_selector_link" data-country-code="FI" data-subdomain="se" data-lang="en" data-do-not-rewrite="true">芬兰</a>(英语)</li>
                  <li><a href="//www.tatmou.com/fr" class="domain_selector_link" data-country-code="FR" data-subdomain="fr" data-lang="fr" data-default-lang="true" data-selected-text="France" data-recommended-text="France" data-do-not-rewrite="true">法国</a>(法语)</li>
                  <li><a href="//www.tatmou.com/uk" class="domain_selector_link" data-country-code="IE" data-subdomain="uk" data-lang="en" data-do-not-rewrite="true">爱尔兰</a>(英语)</li>
                  <li><a href="//www.tatmou.com/it" class="domain_selector_link" data-country-code="IT" data-subdomain="it" data-lang="it" data-default-lang="true" data-selected-text="Italia" data-recommended-text="Italia" data-do-not-rewrite="true">意大利</a>(意大利语)</li>
                  <li><a href="//www.tatmou.com/nl" class="domain_selector_link" data-country-code="LU" data-subdomain="nl" data-lang="en" data-do-not-rewrite="true">卢森堡</a>(英语)</li>
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                  <li><a href="//www.tatmou.com/nl" class="domain_selector_link" data-country-code="NL" data-subdomain="nl" data-lang="en" data-default-lang="true" data-selected-text="Benelux" data-recommended-text="Netherlands" data-do-not-rewrite="true">荷兰</a>(英语)</li>
                  <li><a href="//www.tatmou.com/se" class="domain_selector_link" data-country-code="NO" data-subdomain="se" data-lang="en" data-do-not-rewrite="true">挪威</a>(英语)</li>
                  <li><a href="//www.tatmou.com/de" class="domain_selector_link" data-country-code="AT" data-subdomain="de" data-lang="de" data-do-not-rewrite="true">奥地利</a>(德意志)</li>
                  <li><a href="//www.tatmou.com/jp/" class="domain_selector_link" data-country-code="PT" data-subdomain="www" data-lang="en" data-do-not-rewrite="true">葡萄牙</a>(英语)</li>
                  <li><a href="//www.tatmou.com/se" class="domain_selector_link" data-country-code="Sweden" data-subdomain="se" data-lang="en" data-default-lang="true" data-selected-text="Nordic" data-recommended-text="Sweden" data-do-not-rewrite="true">瑞典</a>(英语)</li>
                  <li>瑞士<ul class="list-unstyled add_indent_20">
                    <li><a href="//www.tatmou.com/ch" class="domain_selector_link" data-country-code="CH" data-subdomain="ch" data-lang="de" data-selected-text="Schweiz" data-recommended-text="Schweiz" data-do-not-rewrite="true">德意志</a></li>
                    <li><a href="//www.tatmou.com/ch" id="swiss_english" class="domain_selector_link" data-country-code="CH" data-subdomain="ch" data-lang="en" data-default-lang="true" data-selected-text="Switzerland" data-recommended-text="Switzerland" data-do-not-rewrite="true">英语</a></li>
                    <li><a href="//www.tatmou.com/ch" class="domain_selector_link" data-country-code="CH" data-subdomain="ch" data-lang="fr" data-selected-text="Suisse" data-recommended-text="Suisse" data-do-not-rewrite="true">法语</a></li>
                   </ul></li>
                  <li><a href="//www.tatmou.com/uk" class="domain_selector_link" data-country-code="GB" data-subdomain="uk" data-lang="en" data-default-lang="true" data-selected-text="United Kingdom" data-recommended-text="United Kingdom" data-do-not-rewrite="true">英国</a>(英语)</li>
                 </ul>
                </div>
               </div>
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