How to get ip address in java

java method to obtain the IP address:

/**
     * 通过HttpServletRequest返回IP地址
     *
     * @param request HttpServletRequest
     * @return ip String
     * @throws Exception
     */
    private static 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.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();
            if (LOCAL_IP.equals(ip) || LOCAL_IP1.equals(ip)) {
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                    ip = inet.getHostAddress();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
            }
        }
        return ip;
    }

The HttpServletRequest object represents the client's request. When the client accesses the server through the HTTP protocol, all information in the HTTP request header All are encapsulated in this object. Through the methods provided by this object, all the information requested by the client can be obtained.

Commonly used methods:

getRequestURL method returns the complete URL when the client makes a request.

The getRequestURI method returns the resource name part of the request line.

The getQueryString method returns the parameter part in the request line.

The getPathInfo method returns additional path information in the request URL. The extra path information is the content in the request URL after the Servlet's path and before the query parameters, which starts with "/".

The getRemoteAddr method returns the IP address of the client that made the request.

The getRemoteHost method returns the full host name of the client that made the request.

The getRemotePort method returns the network port number used by the client.

The getLocalAddr method returns the IP address of the WEB server.

The getLocalName method returns the host name of the WEB server.

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