用 JAVA 解析网站 HTML

问题描述

我想解析一个简单的网站并从该网站抓取信息.

I want to parse a simple web site and scrape information from that web site.

我曾经用 DocumentBuilderFactory 解析 XML 文件，我试图对 html 文件做同样的事情，但它总是进入无限循环.

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());

有什么问题吗?或者有没有更简单的方法可以从网站上抓取给定 html 标签的数据?

Whats is the problem? Or is there any easier way to scrape data from a web site for a given html tag?

推荐答案

有一个更简单的方法来做到这一点.我建议使用 JSoup.使用 JSoup，您可以执行诸如

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");

或者如果你想要身体:

Elements body = doc.select("body");

或者如果您想要所有链接:

Or if you want all links:

Elements links = doc.select("body a");

您不再需要获取连接或处理流.简单的.如果您曾经使用过 jQuery，那么它与此非常相似.

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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