request.setAttribute("array", array);
request.getRequestDispatcher("/servleturl").include(request, response);

Object[] array = (Object[]) request.getAttribute("array");

StringBuilder queryString = new StringBuilder();
for (Object item : array) {
    queryString.append("array=").append(URLEncoder.encode(item, "UTF-8")).append("&");
}
response.sendRedirect("/servleturl?" + queryString);

String[] array = request.getParameterValues("array");

String arrayID = UUID.randomUUID().toString();
request.getSession().setAttribute(arrayID, array);
response.sendRedirect("/servleturl?arrayID=" + arrayID);

String arrayID = request.getParameter("arrayID");
Object[] array = (Object[]) request.getSession().getAttribute(arrayID);
request.getSession().removeAttribute(arrayID);