获取CentOS软件源中的updates包

可是我们也就是在本地用用，不需要同步，于是写了个Java程序，找了个速度比较快的镜像（东北大学的，写程序的时候北理工的镜像站打不开），直接很暴力地把上面的updates目录下的包 全都抓下来了，然后createrepo一下就可以用了，抓软件包的代码如下，其中HttpFactoy是自定义的一个封装Apache HttpClient接口的工具类：

package cn.edu.ruc.extract;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;

import org.htmlparser.NodeFilter;
import org.htmlparser.Parser;
import org.htmlparser.filters.TagNameFilter;
import org.htmlparser.tags.TableColumn;
import org.htmlparser.tags.TableRow;
import org.htmlparser.tags.TableTag;
import org.htmlparser.util.NodeList;
import org.htmlparser.visitors.HtmlPage;

public class Main
{
	public static void main(String[] args)
	{
		try
		{
			//要抓取的目录
			String baseUrl = "http://mirror.neu.edu.cn/centos/6.4/updates/x86_64/Packages/";
			String html = HttpFactory.getInstance().getPageContent(baseUrl);
			//存放软件包的本地目录
			String rootDir = "/home/hadoop/updates/";
			Parser parser = Parser.createParser(html, "utf-8");
			HtmlPage page = new HtmlPage(parser);
			parser.visitAllNodesWith(page);
			NodeFilter filter = new TagNameFilter("TABLE");
			NodeList nodes = page.getBody().extractAllNodesThatMatch(filter,
					true);
			int num = 0;
			for (int i = 0; i < nodes.size(); ++i)
			{
				TableTag tableTag = (TableTag) nodes.elementAt(i);
				TableRow[] rows = tableTag.getRows();
				for (TableRow row : rows)
				{
					TableColumn[] columns = row.getColumns();
					if (columns != null && columns.length >





 0)
					{
						if (num > 0)
						{
							String fileName = columns[0].toPlainTextString().trim();
							String url = baseUrl + fileName;
							System.out.println(url);
							File rpmFile = new File(rootDir + fileName);
							FileOutputStream outputStream = new FileOutputStream(rpmFile);
							InputStream inputStream = HttpFactory.getInstance().getResponseEntity(url).getContent();
							byte b[] = new byte[1024*1024];
							int j = 0;
							while ((j = inputStream.read(b)) != -1)
							{
								outputStream.write(b, 0, j);
							}
							outputStream.flush();
							outputStream.close();
							inputStream.close();
						}
						num++;
					}
				}
			}
			System.out.println(num-1 + " packages downloaded.");
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}
}