一秒刷新页面一次 response.setHeader("refresh","1");
二秒跳到其它页面 response.setHeader("refresh","2;URL=otherPagename");
没有缓存：
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
设置过期的时间期限
response.setDateHeader("Expires", System.currentTimeMillis()+自己设置的时间期限);
訪问别的页面：response.setStatus（302）; response.setHeader("location","url");
通知浏览器数据採用的压缩格式：response.setHeader("Content-Encoding","压缩后的数据");
快速浏览器压缩数据的长度：response.setHeader("Content-Length",压缩后的数据.length+"");
快速浏览器图片或视频：response.setHeader("Content-type","这个參数在tomcat里conf下的web.xml里面找");
inputstream in= this.getServletContext.getResourceAsStream("/2.jpg");
int len=0;
byte buffer[]= new byte[1024]
outputStream out = response.getOutputStream();
while(len=in.read(buffer)>0){
out.write(buffer,0,len)
}
快速浏览器已下载的形式：response.setHeader("Content-disposition","attachment;filename=2.jpg");
inputstream in= this.getServletContext.getResourceAsStream("/2.jpg");
int len=0;
byte buffer[]= new byte[1024]
outputStream out = response.getOutputStream();
while(len=in.read(buffer)>0){
out.write(buffer,0,len)
}