深入HTTP
2021-04-20 13:27
标签：发送 return dispatch 二进制 row response image == gets 防盗链： 深入HTTP 标签：发送 return dispatch 二进制 row response image == gets 原文地址：https://www.cnblogs.com/whtt/p/12259511.html
@WebFilter(filterName = "imgFilter",value = "/img/*")
public class MckzFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("过滤器开始");
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
System.out.println("梅川酷子");
//获取上一个请求地址
HttpServletRequest httprequest=(HttpServletRequest)request;
HttpServletResponse httpresponse=(HttpServletResponse)response;
//获取上一个请求地址
String referer = httprequest.getHeader("Referer");
//获取本项目的请求地址
String serverName = httprequest.getServerName();
System.out.println(referer+"\t"+serverName);
//判断
//如果上一个请求地址为空或者非本项目的请求地址拦截
if(referer==null||!referer.contains(serverName)){
request.getRequestDispatcher("/img/asd.jpg").forward(request,response);
return;
}
chain.doFilter(request,response);
}
@Override
public void destroy() {
System.out.println("过滤器关闭");
}
}