html在java中提取页面的主要部分

Question

你好 我在wikipedia上有一个个性化页面，我想用java源代码从主要部分提取HTML代码

你有什么想法吗

Answer 1

维基百科有API:http://www.mediawiki.org/wiki/API:Main_page

Answer 2

使用Jsoup，特别是selector syntax

Document doc = Jsoup.parse(new URL("http://en.wikipedia.org/", 10000);
Elements interestingParts = doc.select("div.interestingClass");

//get the combined HTML fragments as a String
String selectedHtmlAsString = interestingParts.html();

//get all the links
Elements links = interestingParts.select("a[href]");

//filter the document to include certain tags only
Whitelist allowedTags = Whitelist.simpleText().addTags("blockquote","code", "p");
Cleaner cleaner = new Cleaner(allowedTags);
Document filteredDoc = cleaner.clean(doc);

它是解析HTML页面和提取所需数据的非常有用的API

Answer 3

请注意，这将返回HTML源代码的字符串（某种blob），而不是格式良好的内容项

我自己用这个——一个我需要的小片段。传入url、任何开始和停止文本或布尔值以获取所有内容

public static String getPage(
      String url, 
      String booleanStart, 
      String booleanStop, 
      boolean getAll) throws Exception {
    StringBuilder page = new StringBuilder();
    URL iso3 = new URL(url);
    URLConnection iso3conn = iso3.openConnection();
    BufferedReader in = new BufferedReader(
        new InputStreamReader(
            iso3conn.getInputStream()));
    String inputLine;

    if (getAll) {
      while ((inputLine = in.readLine()) != null) {
        page.append(inputLine);
      }
    } else {    
      boolean save = false;
      while ((inputLine = in.readLine()) != null) {
        if (inputLine.contains(booleanStart)) 
          save = true;
        if (save) 
          page.append(inputLine);
        if (save && inputLine.contains(booleanStop)) {
          break;
        }
      }
    }
    in.close();
    return page.toString();
  }

Answer 4

• 分析网页的结构
• 使用JSoup解析HTML