获取客户端真实IP

原创于 2011-03-20 18:14:19 发布 · 91 阅读

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本文介绍了一种通过检查HTTP请求头部来确定客户端真实IP地址的方法。该方法依次检查x-forwarded-for、Proxy-Client-IP及WL-Proxy-Client-IP等头部字段，并最终回退到使用getRemoteAddr()获取IP地址。

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 /**
     * 该方法实现获取客户端真实地址
     * @author Yang,Hualong
     * @param request
     * @return
     */
    public String getIpAddr(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.getRemoteAddr();  
       }  
       return ip;  
  }