查询URL并返回特定HTML ID的内容
[英]Query URL and return the contents of a specific HTML ID
问题描述
I am looking to write a Java app which queries multiple URLs (defined by a list of URIs) for their HTML source and returns the contents of a specific element with a defined id on each page. 
我希望编写一个Java应用程序，该应用程序查询其HTML源的多个URL（由URI列表定义），并在每个页面上返回具有已定义ID的特定元素的内容。
As an example, lets say one started with a list of a list of blog post URLs such as... 举例来说，假设某人以博客帖子网址列表（例如...）开头。
- http://www.myblog.com/post_three http://www.myblog.com/post_three
- http://www.myblog.com/post_two http://www.myblog.com/post_two
...now, if a sample page looks like the following... ...现在，如果示例页面如下所示...
<html>
<body>
<div class="content">
<h2 id="post_title">Post Title</h2>
<p class="post_paragraph">Here is the content of my post.</p>
</div>
</body>
</html>
How can I grab the contents of the "post_title" id for each of my URLs, and print it to the console with the classic System.out.print(String s)? 如何获取每个URL的“ post_title” ID的内容，并使用经典的System.out.print（String s）将其打印到控制台？
Thanks for all input. 感谢您的所有投入。
2 个解决方案
解决方案1
1 已采纳 2011-04-11 10:22:51
First you resolve the URL using Java's connection API 首先，您使用Java的连接API解析URL
http://download.oracle.com/javase/6/docs/api/java/net/URLConnection.html http://download.oracle.com/javase/6/docs/api/java/net/URLConnection.html
Then you will need to parse the HTML 然后，您将需要解析HTML
http://www.google.be/search?q=java+html+parser http://www.google.be/search?q=java+html+parser
And finally you will need to walk the parsed document structure (that will depend on the parser you choose) to find an element with the given id. 最后，您将需要遍历解析后的文档结构（这将取决于您选择的解析器）以找到具有给定id的元素。
解决方案2
0 2011-04-11 10:36:24
There is included support in java to parse HTML. Java包含对解析HTML的支持。 Take a look at javax.swing.text.html.HTMLEditorKit : http://download.oracle.com/javase/6/docs/api/javax/swing/text/html/HTMLEditorKit.html 看看javax.swing.text.html.HTMLEditorKit ： http : //download.oracle.com/javase/6/docs/api/javax/swing/text/html/HTMLEditorKit.html
A couple of examples of how to use it: 有关如何使用它的几个示例：
http://java.sun.com/products/jfc/tsc/articles/bookmarks/ http://java.sun.com/products/jfc/tsc/articles/bookmarks/
Development/ParseHTML.htm">http://www.java2s.com/Tutorial/Java/0120_Development/ParseHTML.htm Development / ParseHTML.htm“> http://www.java2s.com/Tutorial/Java/0120_Development/ParseHTML.htm
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