/**
	 * 下载验证码图片并保存到手机内部空间<br />
	 * 下载完后会发送一条广播给《一键签到》主程序,让其显示验证码输入框
	 * @param captchaUrl
	 * @param ua
	 * @param cookies
	 * @param siteName
	 * @param user
	 * @param reason
	 * @return
	 */
	private static boolean downloadCaptchaPic(String captchaUrl, String ua, HashMap<String, String> cookies, String siteName, String user, String reason)
	{
		Response res;
		boolean isSucceed = false;
		
		for(int i=0;i<RETRY_TIMES;i++)
		{
			try {
				res = Jsoup.connect(captchaUrl).cookies(cookies).userAgent(ua).timeout(TIME_OUT).ignoreContentType(true).referrer(captchaUrl).method(Method.GET).execute();
				cookies.putAll(res.cookies());
				try {
					deleteCaptchaFile();//删除遗留的验证码
					saveCaptchaToFile(res.bodyAsBytes());//保存验证码到文件
					sendShowCaptchaDialogBC(siteName, user, reason);//给《一键签到》主程序发送广播,让其显示验证码
					isSucceed = true;
					pauseThread();//用线程锁暂停签到线程,如果按下了验证码输入窗口的“确定”或“取消”,程序会对签到线程进行解锁
					break;//跳出重试
				} catch (Exception e) {
					//保存验证码到文件失败
					isSucceed = false;
					e.printStackTrace();
				}
			} catch (IOException e) {
				//拉取验证码失败
				isSucceed = false;
				e.printStackTrace();
			}
		}
		return isSucceed;
	}
 public boolean getCaptchaImgAndCookies(int times) {
   captchaCookies.clear();
   if (times > maxRecursiveTimes) return false;
   Connection con =
       JsoupUtil.getResourceCon(
           "https://www.zhihu.com/captcha.gif?r=" + System.currentTimeMillis() + "&type=login");
   Response rs = null;
   try {
     rs = con.execute();
   } catch (IOException e) {
     e.printStackTrace();
     log.info("获取验证码第" + times + "次失败");
     return getCaptchaImgAndCookies(++times);
   }
   File file = new File(EzraPoundUtil.CAPTCHA_DIR);
   try {
     FileOutputStream out = (new FileOutputStream(file));
     out.write(rs.bodyAsBytes());
   } catch (IOException e) {
     e.printStackTrace();
   }
   captchaCookies.putAll(rs.cookies());
   log.info("验证码已保存" + ",路径为:" + file.getAbsolutePath());
   log.info("验证码对应cookie为:" + captchaCookies);
   return true;
 }