Go语言视频零基础入门到精通

javalearner

一个小小的防盗链图片的filter,还凑合着可以用下 public class ImageRedirectFilter implements Filter {    public void init(FilterConfig config) throws ServletException {
    }  public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {   HttpServletRequest request = (HttpServletRequest) req;
   HttpServletResponse response = (HttpServletResponse) res;   // 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);   } else {    /**
     * 图片正常显示
     */
    chain.doFilter(request, response);
   }  }  public void destroy() {
  }
} web.xml: <filter-mapping>
   <filter-name>imageRedirectFilter</filter-name>
     <url-pattern>/upload/images/*</url-pattern>
  </filter-mapping>