JAVA防盗链图片的filter源代码

web.xml:

imageRedirectFilter
/upload/images/*

源代码:
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() {
}

}

 

转自:http://www.javaweb.cc/architecture/servlet/201693.shtml

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