利用 filter 机制给静态资源 url 加上时间戳，来防止js和css文件的缓存问题

 public class WeiXinFilter implements Filter{ private static Logger logger = LoggerFactory.getLogger(WeiXinFilter.class); public void init(FilterConfig fConfig) throws ServletException {} public void destroy() {} public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest)request; HttpServletResponse resp = (HttpServletResponse)response; String requestURL = req.getRequestURL().toString(); String queryStr = req.getQueryString(); // add timestamp to static resource, to avoid cache if(requestURL != null && (requestURL.endsWith(".js") || requestURL.endsWith(".css"))){ // static resource String newURL = null; if(StringUtils.isNotBlank(queryStr) && queryStr.trim().indexOf(ParameterConfig.STATIC_TAIL) == -1){ newURL = requestURL + "?" + queryStr + "&" + ParameterConfig.STATIC_TAIL + new Date().getTime(); resp.sendRedirect(newURL); // req.getRequestDispatcher(newURL).forward(request, response); return; } if(StringUtils.isBlank(queryStr)){ newURL = requestURL + "?" + ParameterConfig.STATIC_TAIL + new Date().getTime(); resp.sendRedirect(newURL); // req.getRequestDispatcher(newURL).forward(request, response); return; } try{ chain.doFilter(request, response); }catch(Exception e){ logger.error(e.toString()); } return; } public class ParameterConfig { /** 静态资源 为防止缓存，加上时间戳标志 */ public static final String STATIC_TAIL = "__oawx_t=";