在JSP中获取客户端的IP地址

Question

我需要在JSP页面中获取客户端的IP地址.我尝试了以下方法:

request.getRemoteAddr()
request.getHeader("X_FORWARDED_FOR")
request.getHeader("HTTP_CLIENT_IP")
request.getHeader("WL-Proxy-Client-IP")
request.getHeader("Proxy-Client-IP")
request.getHeader("REMOTE_ADDR")

但是,这些方法都没有返回所需的IP地址.如何在JSP页面中获取客户端的IP地址？

Answer 1

要获取客户端的IP地址,我使用了以下方法

<%   String ip = request.getHeader("X-Forwarded-For");  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getHeader("Proxy-Client-IP");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getHeader("WL-Proxy-Client-IP");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getHeader("HTTP_CLIENT_IP");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getRemoteAddr();  
        }
        %>

希望这有帮助,请留下反馈.

Answer 2

<%
out.print( request.getRemoteAddr() );
out.print( request.getRemoteHost() );
%>

如果客户端在代理后面，您可能无法获得真实的客户端 IP，您将获得代理的 IP，而不是客户端。但是，代理可能会在特殊的 HTTP 标头中包含请求的客户端 IP。

<%
out.print( request.getHeader("x-forwarded-for") );
%>

Answer 3

你使用像apache代理这样的反向代理吗？ http://httpd.apache.org/docs/2.2/mod/mod_proxy.html

当以反向代理模式运行时（例如，使用 ProxyPass 指令），mod_proxy_http 添加几个请求标头，以便将信息传递到源服务器。这些标头是：

X-Forwarded-For
The IP address of the client.
X-Forwarded-Host
The original host requested by the client in the Host HTTP request header.
X-Forwarded-Server
The hostname of the proxy server.