AddressUtils.java

package com.dounine.corgi.utils;

import com.dounine.corgi.request.RequestContext;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * Created by huanghuanlai on 16/6/20.
 */
public final class AddressUtils {

    private static final ThreadLocal<HttpServletRequest> REQUEST = new ThreadLocal<>();
    private static final String UNKNOWN = "unknown";

    private AddressUtils(){}

    public static String getRemoteAddr(){
        return getRemoteAddr(RequestContext.get());
    }

    public static String getRemoteAddr(final HttpServletRequest request) {
        String ipAddress = request.getHeader("X-Forwarded-For");
        if (StringUtils.isBlank(ipAddress) || UNKNOWN.equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if (StringUtils.isBlank(ipAddress) || UNKNOWN.equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if (StringUtils.isBlank(ipAddress) || UNKNOWN.equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
        }
        if (StringUtils.isBlank(ipAddress)) {
            try {
                ipAddress = InetAddress.getLocalHost().getHostAddress();
            } catch (UnknownHostException e) {
                e.printStackTrace();
            }
        }
        return ipAddress;
    }


}