软件简介

Crawler4j是一个开源的Java类库提供一个用于抓取Web页面的简单接口。可以利用它来构建一个多线程的Web爬虫。

示例代码：

import java.util.ArrayList;
import java.util.regex.Pattern;

import edu.uci.ics.crawler4j.crawler.Page;
import edu.uci.ics.crawler4j.crawler.WebCrawler;
import edu.uci.ics.crawler4j.url.WebURL;

public class MyCrawler extends WebCrawler {

Pattern filters = Pattern.compile(“.*(\\.(css|js|bmp|gif|jpe?g”
+ “|png|tiff?|mid|mp2|mp3|mp4”
+ “|wav|avi|mov|mpeg|ram|m4v|pdf”
+ “|rm|smil|wmv|swf|wma|zip|rar|gz))$”);

public MyCrawler() {
}

public boolean shouldVisit(WebURL url) {
String href = url.getURL().toLowerCase();
if (filters.matcher(href).matches()) {
return false;
}
if (href.startsWith(“http://www.ics.uci.edu/")) {
return true;
}
return false;
}

public void visit(Page page) {
int docid = page.getWebURL().getDocid();
String url = page.getWebURL().getURL();
String text = page.getText();
ArrayList links = page.getURLs();
}
}