import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.ArrayList; import java.util.regex.Matcher; import java.util.regex.Pattern; public class HtmlParser {  /**   * 要分析的网页   */  String htmlUrl;  /**   * 分析结果   */  ArrayList<String> hrefList = new ArrayList();  /**   * 网页编码方式   */  String charSet;  public HtmlParser(String htmlUrl) {   // TODO 自动生成的构造函数存根   this.htmlUrl = htmlUrl;  }  /**   * 获取分析结果   *   * @throws IOException   */  public ArrayList<String> getHrefList() throws IOException {   parser();   return hrefList;  }  /**   * 解析网页链接   *   * @return   * @throws IOException   */  private void parser() throws IOException {   URL url = new URL(htmlUrl);   HttpURLConnection connection = (HttpURLConnection) url.openConnection();   connection.setDoOutput(true);   String contenttype = connection.getContentType();   charSet = getCharset(contenttype);   InputStreamReader isr = new InputStreamReader(     connection.getInputStream(), charSet);   BufferedReader br = new BufferedReader(isr);   String str = null, rs = null;   while ((str = br.readLine()) != null) {    rs = getHref(str);    if (rs != null)     hrefList.add(rs);   }  }  /**   * 获取网页编码方式   *   * @param str   */  private String getCharset(String str) {   Pattern pattern = Pattern.compile("charset=.*");   Matcher matcher = pattern.matcher(str);   if (matcher.find())    return matcher.group(0).split("charset=")[1];   return null;  }  /**   * 从一行字符串中读取链接   *   * @return   */  private String getHref(String str) {   Pattern pattern = Pattern.compile("<a href=.*</a>");   Matcher matcher = pattern.matcher(str);   if (matcher.find())    return matcher.group(0);   return null;  }  public static void main(String[] arg) throws IOException {   HtmlParser a = new HtmlParser("http://news.163.com/");   ArrayList<String> hrefList = a.getHrefList();   for (int i = 0; i < hrefList.size(); i++)    System.out.println(hrefList.get(i));  } }