使用 response.setHeader 强ie缓存css background 图片

 

test.html

 

测试

 

 

s.jsp

<%@ page contentType="image/JPEG" %><%
  String filename = request.getParameter("s");
  response.setHeader("Cache-Control","max-age=100000");
  String path=request.getRealPath("/");
  String localfile = path+filename;
  java.io.BufferedOutputStream bout=new java.io.BufferedOutputStream(response.getOutputStream(),2048);
  java.io.File sf= new java.io.File(localfile);
  byte bufferbyte[] = new byte[2048];
  java.io.BufferedInputStream bin = new java.io.BufferedInputStream(new java.io.FileInputStream(sf),2048);
  int k = 0;
  while((k = bin.read(bufferbyte))!=-1){
    bout.write(bufferbyte,0,k);
  }
  bin.close();
  bout.flush();
  bout.close();
%>