jsp防盗链代码

// 禁止缓存 
  response.setHeader("Cache-Control", "no-store"); 
  response.setHeader("Pragrma", "no-cache"); 
  response.setDateHeader("Expires", 0);

// 链接来源地址 
  String referer = request.getHeader("referer"); 
  System.out.println("refer is"+referer);

if (referer == null || !referer.contains(request.getServerName())) {

/** 
    * 如果 链接地址来自其他网站，则返回错误图片 
    */ 
   request.getRequestDispatcher("/error.gif").forward(request, 
     response);

}