JAVA工具--通过HttpServletRequest获取IP

灰太狼 2023-10-09 12:50 5阅读 0赞

# JAVA工具–通过HttpServletRequest获取IP #

import java.net.InetAddress;
    import java.net.UnknownHostException;
    import java.util.logging.Logger;
    
    import javax.servlet.http.HttpServletRequest;
    
    /** * IP工具类 * @author * @Date */
    public class IpUtils { 
    
        private static final Logger logger = Logger.getLogger(IpUtils.class.getName());
    
        private static String LOCAL_IP_STAR_STR = "192.168.";
    	
    	/** * 获取本机IP */
        static { 
            String ip = null;
            String hostName = null;
            try { 
                hostName = InetAddress.getLocalHost().getHostName();
                InetAddress[] ipAddrs = InetAddress.getAllByName(hostName);
                for (InetAddress ipAddr : ipAddrs) { 
                    if (ipAddr.getHostAddress().startsWith(LOCAL_IP_STAR_STR)) { 
                        break;
                    }
                }
                if (ip == null) { 
                    ip = ipAddrs[0].getHostAddress();
                }
    
            } catch (UnknownHostException e) { 
                logger.severe("IpUtils error.");
            }
    
            LOCAL_IP = ip;
            HOST_NAME = hostName;
    
        }
    
        /** * 系统的本地IP地址 */
        public static final String LOCAL_IP;
    
        /** * 系统的本地服务器名 */
        public static final String HOST_NAME;
    
        /** * 获取客户端的IP地址的方法是：request.getRemoteAddr()，这种方法在大部分情况下都是有效的。 * 但是在通过了Apache,Squid等反向代理软件就不能获取到客户端的真实IP地址了，如果通过了多级反向代理的话， * X-Forwarded-For的值并不止一个，而是一串IP值， 究竟哪个才是真正的用户端的真实IP呢？ * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。 * 例如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, * 192.168.1.100 用户真实IP为： 192.168.1.110 * @param request * @return */
        public static String getIpAddr(HttpServletRequest request) { 
            String unknown = "unknown";
            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.getRemoteAddr();
                if (ip.equals("127.0.0.1")) { 
                    /** 根据网卡取本机配置的IP */
                    InetAddress inet = null;
                    try { 
                        inet = InetAddress.getLocalHost();
                        ip = inet.getHostAddress();
                    } catch (UnknownHostException e) { 
                        logger.severe("IpHelper error." + e.toString());
                    }
                }
            }
    
            // 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 "***.***.***.***".length() = 15
            int ipMaxLength = 15;
            if (ip != null && ip.length() > ipMaxLength) { 
                return ip.substring(0, ip.indexOf(","));
            }
            return ip;
        }
    }