8.IP地址相关

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

/**
 * 工具类 -IP地址相关
 *
 */
public class IPUtil {

    /**
     * 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址;
     * 
     * @param request
     * @return ip
     * @throws IOException
     */
    public final static String getIpAddress(HttpServletRequest request) throws IOException {
        // 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址
        String ip = request.getHeader("X-Forwarded-For");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            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();
            }
        } else if (ip.length() > 15) {
            String[] ips = ip.split(",");
            for (int index = 0; index < ips.length; index++) {
                String strIp = (String) ips[index];
                if (!("unknown".equalsIgnoreCase(strIp))) {
                    ip = strIp;
                    break;
                }
            }
        }
        return ip;
    }

    /**
     * 判断某IP是否在某IP段内
     * 
     * @param ipSection
     *            IP段 以-分割前后范围值 例:192.168.1.1-192.168.1.10
     * @param ip
     *            IP
     * @return 在内T否则F
     */
    public static boolean isInIpSection(String ipSection, String ip) {
        if (ipSection == null || ip == null)
            throw new NullPointerException("ipSection or ip cannot be null");

        ipSection = ipSection.trim();
        ip = ip.trim();
        final String REGX_IP = "((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)";
        final String REGX_IPB = REGX_IP + "\\-" + REGX_IP;
        if (!ipSection.matches(REGX_IPB) || !ip.matches(REGX_IP))
            return false;
        int idx = ipSection.indexOf('-');
        String[] sips = ipSection.substring(0, idx).split("\\.");
        String[] sipe = ipSection.substring(idx + 1).split("\\.");
        String[] sipt = ip.split("\\.");
        long ips = 0L, ipe = 0L, ipt = 0L;
        for (int i = 0; i < 4; ++i) {
            ips = ips << 8 | Integer.parseInt(sips[i]);
            ipe = ipe << 8 | Integer.parseInt(sipe[i]);
            ipt = ipt << 8 | Integer.parseInt(sipt[i]);
        }
        if (ips > ipe) {
            long t = ips;
            ips = ipe;
            ipe = t;
        }
        return ips <= ipt && ipt <= ipe;
    }

    /**
     * 判断IP地址是否为IPv4地址
     * 
     * @param ipAddress
     *            IP地址
     * @return 是T否F
     */
    public static boolean isIPv4(String ipAddress) {
        Pattern pattern = Pattern
                .compile("([0-9]|[0-9]\\d|1\\d{2}|2[0-1]\\d|25[0-5])(\\.(\\d|[0-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}");
        Matcher matcher = pattern.matcher(ipAddress);
        boolean match = matcher.matches();
        return match;
    }


}