HTML für Links analysieren

Question

Ich möchte eine lokale HTML - Datei mit JSOUP für Links analysieren. Aber es funktioniert immer noch nicht. Der Kodex ist:

public static Set<String> getAllLinksFromPage(String file) throws IOException{ 
    final Set<String> result = new HashSet<String>(); 
    File input = new File(file); 

    Document doc = Jsoup.parse(file); 

    Elements links = doc.select("a[href]"); 
    for(Element link : links) { 
     result.add(links.attr("abs:href")); 
    } 

    return result; 

} 

und der Ausgang ist: []

Also, was ist das Problem?

Answer 1

Sie haben ein paar Fehler im Code, den Sie eingefügt haben:

1. Document doc = Jsoup.parse(file) Sie können Jsoup.parse(String html) Methode hier statt Jsoup.parse(File in, String charset). Sie haben den falschen Variablennamen verwendet - file ist eine Eingabezeichenfolge (Dateiname nehme ich an), während der Verweis auf die Datei mit der Variablen input beibehalten wird. Es sollte Document doc = Jsoup.parse(input, "UTF-8"); tun

2. Sie haben einen Tippfehler in result.add(links.attr("abs:href")); - Sie Attribut „abs: href“ nehmen aus einer Liste von Links anstelle einer Verbindung, die zur Zeit genommen wird, während über eine links Liste iterieren: result.add(link.attr("abs:href"));

nach der Anwendung werden alle Änderungen Ihre Methode sollte wie folgt aussehen:

public static Set<String> getAllLinksFromPage(String file) throws IOException { 
    final Set<String> result = new HashSet<String>(); 
    File input = new File(file); 

    Document doc = Jsoup.parse(input, "UTF-8"); 

    Elements links = doc.select("a[href]"); 
    for (Element link : links) { 
     result.add(link.attr("abs:href")); 
    } 

    return result; 
} 

ich es w mit HTML-Datei reflektiert diese Seite (ich speicherte es nur /tmp/test.html Datei und verwendet getestet haben iith Ihre Funktion) und das ist das Ergebnis, das ich bekomme:

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