RequestUtil.java

RequestUtil.java

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

/**
 * RequestUtil
 */
public class RequestUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(RequestUtil.class);

    private RequestUtil() {

    }

    /**
     * 从request中获取真实IP
     *
     * @param request
     * @return
     */
    public 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("X-Real-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        if (ip == null) {
            ip = "";
        }
        if ("127.0.0.1".equals(ip) || "localhost".equalsIgnoreCase(ip) || "0:0:0:0:0:0:0:1".equals(ip)) {
            try {
                InetAddress addr = InetAddress.getLocalHost();
                ip = addr.getHostAddress();
            } catch (UnknownHostException e) {
                LOGGER.error("UnknownHost", e);
            }
        }

        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        //"***.***.***.***".length() = 15
        if (ip != null && ip.length() > 15 && ip.indexOf(",") > 0) {
            ip = ip.substring(0, ip.indexOf(","));
        }
        return ip;
    }

    public static String getAgent(HttpServletRequest request) {
        return request.getHeader("USER-AGENT");
    }
}