java req.getIP

java req.getIP

/** * 獲取當前網絡ip * @param request * @return 原文網址：https://kknews.cc/code/9zrbyk5.html*/ 
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"))
        { 
            //根據網卡取本機配置的IP 
            InetAddress inet=null; 
            try { inet = InetAddress.getLocalHost(); 
            } catch (UnknownHostException e) { 
                e.printStackTrace(); 
            } 
            ipAddress= inet.getHostAddress(); 
        } 
    } 
    //對於通過多個代理的情況，第一個IP為客戶端真實IP,多個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; 
}