获取IP地址

获取客户端真实IP地址

原创已于 2022-05-16 10:46:39 修改 · 140 阅读

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文章标签：

#tcp/ip #网络协议 #网络

于 2018-12-26 18:22:04 首次发布

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本文介绍了一种在Java中从HttpServletRequest请求中获取客户端真实IP地址的方法。通过检查多个请求头，包括x-forwarded-for、Proxy-Client-IP和WL-Proxy-Client-IP，并最终回退到使用request.getRemoteAddr()来确保即使在经过代理的情况下也能准确获取IP地址。此外，还处理了本地IP和IPv6地址的特殊情况。

/** 
     * 获取当前网络ip 
     * @param request 
     * @return 
     */  
    public String getIpAddr(HttpServletRequest request){  
        String ipAddress = request.getHeader("x-forwarded-for");  
            if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
                ipAddress = request.getHeader("Proxy-Client-IP");  
            }  
            if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
                ipAddress = request.getHeader("WL-Proxy-Client-IP");  
            }  
            if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
                ipAddress = request.getRemoteAddr();  
                if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){  
                    //根据网卡取本机配置的IP  
                    InetAddress inet=null;  
                    try {  
                        inet = InetAddress.getLocalHost();  
                    } catch (UnknownHostException e) {  
                        e.printStackTrace();  
                    }  
                    ipAddress= inet.getHostAddress();  
                }  
            }  
            //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割  
            if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15  
                if(ipAddress.indexOf(",")>0){  
                    ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));  
                }  
            }  
            return ipAddress;   
    }