How to get the real ip address in java-PHP Tutorial-php.cn

How to get the real ip address in java

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Release： 2016-07-29 08:56:39

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In JSP, the method to obtain the client's IP address is: request.getRemoteAddr(). This method is effective in most cases. However, after using reverse proxy software such as Apache, Squid, nginx, etc., due to the addition of an intermediate layer between the client and the service, the IP obtained by the request.getRemoteAddr() method is actually the address of the proxy server, not the address of the proxy server. The client's IP address.

But in the HTTP header information of the forwarded request, X-FORWARDED-FOR information is added. Used to track the original client IP address and the server address requested by the original client.

package com.rapido.utils; 
  
import javax.servlet.http.HttpServletRequest; 
  
/** 
 * 自定义访问对象工具类 
 * 
 * 获取对象的IP地址等信息 
 * @author X-rapido 
 * 
 */
public class CusAccessObjectUtil { 
  
  /** 
   * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址, 
   * 
   * 可是，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。 
   * 
   * 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 getIpAddress(HttpServletRequest request) { 
    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(); 
    } 
    return ip; 
  } 
    
}

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