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
<filter>
<filter-name>imageRedirectFilter</filter-name>
<filter-class>com.filter.ImageRedirectFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>imageRedirectFilter</filter-name>
<url-pattern>/upload/images/*</url-pattern>
</filter-mapping>
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