判断每个ip是否在以个指定的IP段内

package com.tiansong.infosafetranflag.safe.www;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.tiansong.infosafetranflag.safe.system.entity.IPItem;
import com.tiansong.infosafetranflag.safe.system.service.IPItemService;
import com.tiansong.infosafetranflag.safe.system.service.ServiceFactory;
import com.tiansong.infosafetranflag.safe.system.service.dao.DAOServiceFactory;

public class RemoteHostFilter implements Filter {

	public RemoteHostFilter() {
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse resp = (HttpServletResponse) response;
		// 取得本机的IP地址
		//InetAddress localAddress = InetAddress.getLocalHost();

		//String ipAddress = localAddress.getHostAddress();
		
		String ipAddress = req.getRemoteHost();
System.out.println(ipAddress);
		long ip = getIpNum(ipAddress);

		ServiceFactory factory = new DAOServiceFactory();
		try {
			IPItemService ipService = factory.createIPItemService();

			// 从数据库中取出所有的IP段
			List ipList = ipService.getAllIPItem();
			if (ipList.size() > 0 && ipList != null) {
				for (Iterator it = ipList.iterator(); it.hasNext();) {
					IPItem item = (IPItem) it.next();
					String startIp = item.getStartIp();
					String endIp = item.getEndIp();
					long start_ip = getIpNum(startIp);
					long end_ip = getIpNum(endIp);

					if (isInner(ip, start_ip, end_ip)) {
						if (item.getStatus().equals("1")
								|| item.getStatus().equals("true")) {
							//System.out.println("你的IP已被屏蔽，请跟管理员联系！");
							//resp.sendError(404);
							resp.sendRedirect(req.getContextPath()
									+ "/NoSecurity.html");
							return;
						}
					}
				}
			}

		} catch (Exception e) {
		}
		chain.doFilter(request, response);
	}

	public void destroy() {

	}

	public void init(FilterConfig filterConfig) {

	}

	/**
	 * 分割IP
	 * 
	 * @param ipAddress
	 * @return
	 */
	private static long getIpNum(String ipAddress) {
		String[] ip = ipAddress.split("\\.");
		long a = Integer.parseInt(ip[0]);
		long b = Integer.parseInt(ip[1]);
		long c = Integer.parseInt(ip[2]);
		long d = Integer.parseInt(ip[3]);

		long ipNum = a * 256 * 256 * 256 + b * 256 * 256 + c * 256 + d;
		return ipNum;
	}

	/**
	 * 判断客户端的IP是否在某个ip段中
	 * 
	 * @param clientIp
	 *            客户端的IP
	 * @param begin
	 *            开始IP
	 * @param end
	 *            结束IP
	 * @return
	 */
	private static boolean isInner(long clientIp, long begin, long end) {
		return (clientIp >= begin) && (clientIp <= end);
	}

}

js检测IP

function iptest(v){
        var ip = /^([1-9][0-9]{0,1}|1[013-9][0-9]|12[0-689]|2[01][0-9]|22[0-3])([.]([1-9]{0,1}[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])){2}[.]([1-9][0-9]{0,1}|1[0-9]{2}|2[0-4][0-9]|25[0-4])$/;
        return ip.test(v);
    }