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我是一個使用crawler4j構建塊構建的簡單Web爬網程序。我正在嘗試構建一個字典,因爲我的爬蟲爬網,然後將它傳遞給我的主(控制器),因爲它構建和解析文本。我如何做到這一點,因爲我的MyCrawler對象不是在我的主類中創建的(使用MyCrawler.class作爲第一個參數)?另外,我無法更改controller.start方法。我希望能夠在抓取工具完成後使用在抓取工具中創建的字典。使用crawler4j在類之間傳遞一個對象
我認爲能做到這一點的最佳方法是使用controller.start創建一個預定義並創建的MyCrawler對象,但無法做到這一點,我可以看到。
以下是我的代碼。非常感謝您的幫助!
履帶:
public class MyCrawler extends WebCrawler
{
private final static Pattern FILTERS = Pattern.compile(".*(\\.(css|js|gif|jpg|png|mp3|mp3|zip|gz))$");
public ArrayList<String> dictionary = new ArrayList<String>();
@Override public boolean shouldVisit(Page referringPage, WebURL url)
{
String href = url.getURL().toLowerCase();
return !FILTERS.matcher(href).matches()
&& href.startsWith("http://lyle.smu.edu/~fmoore"));
}
@Override public void visit(Page page)
{
String url = page.getWebURL().getURL();
System.out.println("URL: " + url);
if(page.getParseData() instanceof HtmlParseData)
{
HtmlParseData h = (HtmlParseData)page.getParseData();
String text = h.getText();
String[] words = text.split(" ");
for(int i = 0;i < words.length;i++)
{
if(!words[i].equals("") || !words[i].equals(null) || !words[i].equals("\n"))
dictionary.add(words[i]);
}
String html = h.getHtml();
Set<WebURL> links = h.getOutgoingUrls();
System.out.println("Text length: " + text.length());
System.out.println("Html length: " + html.length());
System.out.println("Number of outgoing links: " + links.size());
System.out.println(text);
}
}
}
控制器:
public class Controller
{
public ArrayList<String> dictionary = new ArrayList<String>();
public static void main(String[] args) throws Exception
{
int numberOfCrawlers = 1;
String crawlStorageFolder = "/data/crawl/root";
CrawlConfig c = new CrawlConfig();
c.setCrawlStorageFolder(crawlStorageFolder);
c.setMaxDepthOfCrawling(-1); //Unlimited Depth
c.setMaxPagesToFetch(-1); //Unlimited Pages
c.setPolitenessDelay(200); //Politeness Delay
PageFetcher pf = new PageFetcher(c);
RobotstxtConfig robots = new RobotstxtConfig();
RobotstxtServer rs = new RobotstxtServer(robots, pf);
CrawlController controller = new CrawlController(c, pf, rs);
controller.addSeed("http://lyle.smu.edu/~fmoore");
controller.start(MyCrawler.class, numberOfCrawlers);
controller.shutdown();
controller.waitUntilFinish();
}
}