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                # 處理URLs <h2>問題</h2> <p>你有一個包含相對URLs路徑的HTML文檔,需要將這些相對路徑轉換成絕對路徑的URLs。</p> <h2>方法</h2> <ol> <li>在你解析文檔時確保有指定<code>base URI</code>,然后</li> <li>使用 <code>abs:</code> 屬性前綴來取得包含<code>base URI</code>的絕對路徑。代碼如下:&nbsp;</li> </ol> <pre><code>Document doc = Jsoup.connect("http://www.open-open.com").get(); Element link = doc.select("a").first(); String relHref = link.attr("href"); // == "/" String absHref = link.attr("abs:href"); // "http://www.open-open.com/" </code></pre> <h2>說明</h2> <p>在HTML元素中,URLs經常寫成相對于文檔位置的相對路徑: <code>&lt;a&nbsp;href="/download"&gt;...&lt;/a&gt;</code>. 當你使用 <code><a title="Get an attribute's value by its key." href="http://jsoup.org/apidocs/org/jsoup/nodes/Node.html#attr%28java.lang.String%29">Node.attr(String key)</a></code> 方法來取得a元素的href屬性時,它將直接返回在HTML源碼中指定定的值。</p> <p>假如你需要取得一個絕對路徑,需要在屬性名前加 <code>abs:</code> 前綴。這樣就可以返回包含根路徑的URL地址<code>attr("abs:href")</code></p> <p>因此,在解析HTML文檔時,定義base URI非常重要。</p> <p>如果你不想使用<code>abs:</code> 前綴,還有一個方法能夠實現同樣的功能 <code><a title="Get an absolute URL from a URL attribute that may be relative (i.e." href="http://jsoup.org/apidocs/org/jsoup/nodes/Node.html#absUrl%28java.lang.String%29">Node.absUrl(String key)</a></code>。</p></div>
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