![用JAVA解析网站HTML]( "用JAVA解析网站HTML")
本文介绍了用JAVA解析网站HTML的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我曾经用DocumentBuilderFactory解析XML文件，我试图去做同样的事情。
我想解析一个简单的网站并从该网站上抓取信息。对于html文件，但它总是进入无限循环。
URL url = new URL（http：// www。 deneme.com）;
URLConnection uc = url.openConnection（）;
InputStreamReader input = new InputStreamReader（uc.getInputStream（））;
BufferedReader in = new BufferedReader（input）;
String inputLine;
FileWriter outFile = new FileWriter（orhancan）;
PrintWriter out = new PrintWriter（outFile）; （（inputLine = in.readLine（））！= null）{
out.println（inputLine）;
}
in.close（）;
out.close（）;
文件fXmlFile =新文件（orhancan）;
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance（）;
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder（）;
Document doc = dBuilder.parse（fXmlFile）;
NodeList prelist = doc.getElementsByTagName（body）;
System.out.println（prelist.getLength（））;
什么是问题？或者，有没有更容易的方法从一个给定的HTML标记从网站上刮取数据？ 解决方案
有一种更简单的方法去做这个。我建议使用。使用JSoup，您可以执行以下操作：
Document doc = Jsoup.connect（http://en.wikipedia.org/ ）。得到（）;
元素newsHeadlines = doc.select（＃mp-itn b a）;
或者如果您想要body：
元素body = doc.select（body）;
或者如果您想要所有链接：
元素链接= doc.select（body a）;
您不再需要连接或处理流。简单。如果你曾经使用jQuery，那么它非常相似。
I want to parse a simple web site and scrape information from that web site.
I used to parse XML files with DocumentBuilderFactory, i tried to do the same thing for the html file but it always get into an infinite loop.
URL url = new URL("http://www.deneme.com");
URLConnection uc = url.openConnection();
InputStreamReader input = new InputStreamReader(uc.getInputStream());
BufferedReader in = new BufferedReader(input);
String inputLine;
FileWriter outFile = new FileWriter("orhancan");
PrintWriter out = new PrintWriter(outFile);
while ((inputLine = in.readLine()) != null) {
out.println(inputLine);
}
in.close();
out.close();
File fXmlFile = new File("orhancan");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
NodeList prelist = doc.getElementsByTagName("body");
System.out.println(prelist.getLength());
Whats is the problem? Or is there any easier way to scrape data from a web site for a given html tag?
解决方案
There is a much easier way to do this. I suggest using JSoup. With JSoup you can do things like
Document doc = Jsoup.connect("http://en.wikipedia.org/").get();
Elements newsHeadlines = doc.select("#mp-itn b a");
Or if you want the body:
Elements body = doc.select("body");
Or if you want all links:
Elements links = doc.select("body a");
You no longer need to get connections or handle streams. Simple. If you have ever used jQuery then it is very similar to that.
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