How to only follow certain links with matlab spider

2 vues (au cours des 30 derniers jours)
ben
ben le 10 Mar 2013
Hi I am struggling with only allowing certain urls to be followed when using a spider to build a web graph. Basically I only want the spider to follow links that point to the uni server( shef.ac.uk), any other urls need to be discarded, opposed to the current state were all links are followed. Probably quiet a simple fix.
U = cell(n,1);
hash = zeros(n,1);
L = logical(sparse(n,n));
m = 1;
U{m} = root;
hash(m) = hashfun(root);
for j = 1:n
try
disp(['open ' num2str(j) ' ' U{j}])
page = urlread(U{j});
catch
disp(['fail ' num2str(j) ' ' U{j}])
continue
end
for f = findstr('http:',page);
e = min(findstr('"',page(f:end)));
if isempty(e), continue, end
url = deblank(page(f:f+e-2));
url(url<' ') = '!';
if url(end) == '/', url(end) = []; end
skips = {'.gif','.jpg','.ico'};
skip = any(url=='!') | any(url=='?');
k=0;
while ~skip && (k < length(skips))
k = k+1;
skip = ~isempty(findstr(url,skips{k}));
end
if skip
if isempty(findstr(url,'.gif')) & isempty(findstr(url,'.jpg'))
disp([' skip' url])
end
continue
end
i=0;
for k = find(hash(1:m) == hashfun(url))';
if isequal(U{k},url)
i = k;
break
end
end
if (i == 0) & (m < n)
m = m+1;
U{m} = url;
hash(m) = hashfun(url);
i=m;
end
if i > 0
disp([' link ' int2str(i) ' ' url])
L(i,j) = 1;
end
end
end

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