/**
   * 处理跳转链接，获取重定向地址
   * 
   * @param url
   *            源地址
   * @return 目标网页的绝对地址
   */
  public static String getAbsUrl(String url) {
    CloseableHttpClient httpclient = HttpClients.createDefault();
    HttpClientContext context = HttpClientContext.create();
    HttpGet httpget = new HttpGet(url);
    CloseableHttpResponse response = null;
    String absUrl = null;
    try {
      response = httpclient.execute(httpget, context);
      HttpHost target = context.getTargetHost();
      List<URI> redirectLocations = context.getRedirectLocations();
      // System.out.println("httpget.getURI()：" + httpget.getURI());
      URI location = URIUtils.resolve(httpget.getURI(), target, redirectLocations);
      // System.out.println("Final HTTP location: " +
      // location.toASCIIString());
      absUrl = location.toASCIIString();
    } catch (IOException e) {
      e.printStackTrace();
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        httpclient.close();
        response.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return absUrl;
  }