JavaEE中使用Filter来实现图片的防盗链

一、防盗链图片的filter

public class ImageRedirectFilter implements Filter {

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);
}
}
}

二、web.xml

imageRedirectFilter
com.filter.ImageRedirectFilter


imageRedirectFilter
/upload/images/*

原帖地址：http://blog.csdn.net/itm_hadf/article/details/7390180