Difference between revisions of "Software/Spider"
From ThorstensHome
(→spider for KDE 4) |
m (1 revision(s)) |
Revision as of 09:09, 18 October 2008
A program that follows all links in a given html file.
Contents |
Perl program
The following code lists all links in an html file.
#!/usr/bin/perl
require HTML::LinkExtor;
$p = HTML::LinkExtor->new(\&parse, "");
sub parse
{
my($tag, %links) = @_;
my ($att, $url) = @{[%links]};
print "$url\n";
}
if ($ARGV[0])
{
$p->parse_file($ARGV[0]);
}
else
{
print "Usage: spider.pl htmlfile.htm\n";
}
KDE programs
→ Download version for KDE 4
→ Download version for KDE 3
spider for KDE 4
Problem:
<body>
is recognized correctly, but not
<body lang=DE link=blue vlink=purple bgcolor=#eeeeff>
This is because for XML it should be like
<body lang="DE" link="blue" vlink="purple" bgcolor="#eeeeff">
Solution:
Use tidy to make sure your html file is an xhtml file. Or use
QXmlQuery query;
query.setQuery("index.html", "/html/body/h1");
QStringList headings;
query.evaluateTo(&headings);
Spider.pl
Spider.pl follows all links in an html file:
#!/usr/bin/perl
# spider.pl (c) 2008 by Thorsten Staerk
# This program extracts links in a web page and follows them.
require HTML::LinkExtor;
$p = HTML::LinkExtor->new(\&parse, "");
sub parse
{
my($tag, %links) = @_;
my ($att, $url) = @{[%links]};
#print "$url\n";
get($url);
}
sub parse_if_ok()
{
$filename=$_[0];
$level=$_[1];
$p->parse_file($filename);
}
#int main
get("http://www.heise.de", 0);
sub get( $url )
{
print "Entering get $_[0]\n";
$url=$_[0];
$level=$_[1];
# return if no http:// url
$newurl=$url;
$newurl =~ s\http://\\;
if ($newurl eq $url) {print "returning\n"; return};
use LWP::UserAgent;
$agent = LWP::UserAgent->new;
$answer = HTTP::Request->new(GET => $url);
$answer->header('Accept' => 'text/html');
$res = $agent->request($answer);
if ($res->is_success)
{
print "successfully got response";
$number="1";
$oldurl=url;
$url =~ s\http://\\;
if ($oldurl eq $url) {return};
print "still here";
$filename=$url;
$filename=~ s\/\-\g;
open(FILE, ">"."$filename");
print (FILE $res->content);
print "printing file $filename";
$p->parse_file("file$url");
}
else
{
print "Error: " . $res->status_line . "\n";
}
}
