@RequestMapping("/test") public ModelAndView test(HttpServletResponse response, @RequestHeader (value = "If-Modified-Since", required = false) Date ifModifiedSince){ ModelAndView mav = new ModelAndView("index"); DateFormat gmtDateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss 'GMT'", Locale.US); long now = System.currentTimeMillis(); long maxAge = 20; if(ifModifiedSince != null ) { long lastmodifytime = ifModifiedSince.getTime() - 8 * 60 * 60 * 1000; if(now <= lastmodifytime + (maxAge * 1000)){ response.setStatus(HttpStatus.NOT_MODIFIED.value()); return null; } } String format = gmtDateFormat.format(new Date(now + maxAge * 1000)); response.setHeader("Last-Modified", gmtDateFormat.format(new Date(now))); //当前系统时间 response.setHeader("Date", gmtDateFormat.format(new Date(now))); response.setHeader("Content-Type", "text/html; charset=utf-8"); //过期时间 http 1.0支持 response.setHeader("Expires", format); //文档生存时间 http 1.1支持 response.setHeader("Cache-Control", "max-age=" + maxAge); mav.addObject("now", gmtDateFormat.format(new Date(now))); return mav; }
Http缓存(1)
以下为Spring Mvc设置过期时间控制过期时间
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