java中获取ip的方法：

iteye_18713

于 2010-04-06 14:13:51 发布

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分类专栏：随手记下文章标签： Java

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本文介绍了一种通过Java代码从HttpServletRequest请求中获取客户端IP地址的方法。该方法依次尝试使用x-forwarded-for、Proxy-Client-IP、WL-Proxy-Client-IP等HTTP头部信息来获取代理IP，并最终通过request.getRemoteAddr()获取真实的客户端IP地址。

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           public String getIpAddr(HttpServletRequest request) {     
                      String ip = request.getHeader(" x-forwarded-fo r" ) ;     
                      if(ip == null || ip.length() == 0 || " unknown".equalsIgnoreCase(ip)) {     
                         ip = request.getHeader(" Proxy-Client-IP" ) ;     //获取代理ip
                     }     
                      if(ip == null || ip.length() == 0 || " unknown".equalsIgnoreCase(ip)) {     
                         ip = request.getHeader(" WL-Proxy-Client-IP" ) ;     //获取代理ip
                      }     
                     if(ip == null || ip.length() == 0 || " unknown".equalsIgnoreCase(ip)) {     
                          ip = request.getRemoteAddr();      //获取真实ip
                     }     
                     return ip;     
                }