javaweb之HttpServletResponse响应头
2014-03-07 20:49
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设置浏览器的码表:response.setHeader("Content-type", "text/html;charset=UTF-8");
设置response的编码:response.setCharacterEncoding("UTF-8");
设置浏览器码表的简写形式,并间接设置好了response的码表(上面两句的简写):response.setContentType("text/html;charset=UTF-8");
设置下载的响应头(中文名需要url编码):response.setHeader("content-disposition", "attachment;filename=" + filename);
设置所有浏览器不要缓存,共三个响应头:
response.setDateHeader("expries", -1);
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
设置浏览器打开方式为图片,不是默认的读取文本:response.setContentType("image/jpeg");==response.setHeader("Content-type", "image/jpeg");
控制浏览器定时刷新:每隔三秒刷新一次response.setHeader("refresh", "3");
控制浏览器在3秒后跳转到首页:response.setHeader("refresh", "3;url='/webappName/index.jsp'");
实际开发中servlet不适合展现数据,需要转到jsp让jsp展现数据,所以响应头也要在jsp中,在jsp中发响应头需要用<meta>标签模拟:<meta http-equiv='refresh' content='3;url=/day06/index.jsp'/>
控制浏览器使用缓存,有些文件是很长时间不变的,缓存之后就不用发送请求了(需要注意的是缓存头的时间是从1970年开始的毫秒值):response.setDateHeader("expries", System.currentTimeMillis() + 1000 * 3600);(缓存一小时)
实现请求重定向:response.setStatus(302); response.setHeader("location", "/day06/index.jsp");
设置response的编码:response.setCharacterEncoding("UTF-8");
设置浏览器码表的简写形式,并间接设置好了response的码表(上面两句的简写):response.setContentType("text/html;charset=UTF-8");
设置下载的响应头(中文名需要url编码):response.setHeader("content-disposition", "attachment;filename=" + filename);
设置所有浏览器不要缓存,共三个响应头:
response.setDateHeader("expries", -1);
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
设置浏览器打开方式为图片,不是默认的读取文本:response.setContentType("image/jpeg");==response.setHeader("Content-type", "image/jpeg");
控制浏览器定时刷新:每隔三秒刷新一次response.setHeader("refresh", "3");
控制浏览器在3秒后跳转到首页:response.setHeader("refresh", "3;url='/webappName/index.jsp'");
实际开发中servlet不适合展现数据,需要转到jsp让jsp展现数据,所以响应头也要在jsp中,在jsp中发响应头需要用<meta>标签模拟:<meta http-equiv='refresh' content='3;url=/day06/index.jsp'/>
控制浏览器使用缓存,有些文件是很长时间不变的,缓存之后就不用发送请求了(需要注意的是缓存头的时间是从1970年开始的毫秒值):response.setDateHeader("expries", System.currentTimeMillis() + 1000 * 3600);(缓存一小时)
实现请求重定向:response.setStatus(302); response.setHeader("location", "/day06/index.jsp");
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