jsoup 提取 html 中的所有鏈接、圖片和媒體

 
package org.jsoup.examples;

import org.jsoup.Jsoup;
import org.jsoup.helper.Validate;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.IOException;
/**

Example program to list links from a URL.
*/
public class ListLinks {
 public static void main(String[] args) throws IOException {

 Validate.isTrue(args.length == 1, "usage: supply url to fetch");
 String url = args[0];
 print("Fetching %s...", url);

 Document doc = Jsoup.connect(url).get();
 Elements links = doc.select("a[href]");
 Elements media = doc.select("[src]");
 Elements imports = doc.select("link[href]");

 print("\\nMedia: (%d)", media.size());
 for (Element src : media) {
     if (src.tagName().equals("img"))
         print(" * %s: <%s> %sx%s (%s)",
                 src.tagName(), src.attr("abs:src"), src.attr("width"), src.attr("height"),
                 trim(src.attr("alt"), 20));
     else
         print(" * %s: <%s>", src.tagName(), src.attr("abs:src"));
 }

 print("\\nImports: (%d)", imports.size());
 for (Element link : imports) {
     print(" * %s <%s> (%s)", link.tagName(),link.attr("abs:href"), link.attr("rel"));
 }

 print("\\nLinks: (%d)", links.size());
 for (Element link : links) {
     print(" * a: <%s>  (%s)", link.attr("abs:href"), trim(link.text(), 35));
 }

}
private static void print(String msg, Object... args) {

 System.out.println(String.format(msg, args));

}
private static String trim(String s, int width) {

 if (s.length() > width)
     return s.substring(0, width-1) + ".";
 else
     return s;

}
}


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