BasePage.java 文件源码

/**
 * Returns status view selection, if any, based on
 * parameters, the session or the cookie.
 */
protected final String getClientParameter(final Parameters params, final HttpServletRequest request,
                                          final String parameterName, final String sessionParameterName,
                                          final String cookieName) {
  String result = params.getParameterValue(parameterName);
  if (!StringUtils.isBlank(result)) {
    return result;
  }

  result = request.getParameter(parameterName);
  if (!StringUtils.isBlank(result)) {
    return result;
  }

  final HttpSession session = request.getSession();
  result = (String) session.getAttribute(sessionParameterName);
  if (!StringUtils.isBlank(result)) {
    return result;
  }

  final Cookie[] cookies = request.getCookies();
  if (cookies != null) {
    for (int i = 0; i < cookies.length; i++) {
      final Cookie cookie = cookies[i];
      if (!StringUtils.isBlank(cookie.getName())
              && cookie.getName().equals(cookieName)
              && !StringUtils.isBlank(cookie.getValue())) {
        result = cookie.getValue();
        break;
      }
    }
  }
  return result;
}