如何确定IP的范围

[pumanchawulaowu]

DB内有如下记录：
beginip endip province
192.168.000.000 192.168.001.255 ce
192.168.002.000 192.168.002.255 bj
。。。。。。

那么我怎么确定192.168.002.121 是在bj呢？

[susuifeng]

帮顶..........

[rthfdh]

这个问题太简单了，直接用字符比较

if( your_string.compare(min) >=0 && your_string.compare(max)<=0)

min,max为最小、最大值界限

[pumanchawulaowu]

嗯~
如果是192.168.2.121呢，楼上提供的方法不太兼容噢？

[欢乐极客]

解析和判断

package com.xiaoyong;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * @author 屈小勇 QQ:306741422
 *
 */
public class ConfirmIp {

	private Map<IpObject, String> map;

	public ConfirmIp() {
		map = new HashMap<IpObject, String>();
	}

	// 添加记录
	public void addRecord(String beginIp, String endIp, String province) {
		IpObject ipObject = new IpObject(beginIp, endIp);
		map.put(ipObject, province);
	}

	public void confirmIpLocation(String ip) {
		Iterator<IpObject> iterator = map.keySet().iterator();
		while (iterator.hasNext()) {
			IpObject ipObject = iterator.next();
			String beginIp = ipObject.getBeginIp();
			// 如果前面三组数字匹配
			if (ip.substring(0, 11).equals(beginIp.substring(0, 11))) {
				int ipEnd = Integer.parseInt(ip.substring(12));
				int beginIpEnd = Integer.parseInt(beginIp.substring(12));
				if (ipEnd >= beginIpEnd) {
					String province = this.map.get(ipObject);
					System.out.println(ip + "所在的province为:" + province);
					return;
				}
			}
		}
		System.out.println("没有找到 " + ip + " 所在的位置");
	}

	// 使用内部类封装IP段
	class IpObject extends Object {

		private String beginIp;

		private String endIp;

		public IpObject(String beginIp, String endIp) {
			this.beginIp = beginIp;
			this.endIp = endIp;
		}

		public String getBeginIp() {
			return beginIp;
		}

		public String getEndIp() {
			return endIp;
		}
	}

	public static void main(String[] args) {
		ConfirmIp confirmIp = new ConfirmIp();
		confirmIp.addRecord("192.168.000.000", "192.168.001.255", "ce");
		confirmIp.addRecord("192.168.002.000", "192.168.002.255", "bj");
		confirmIp.confirmIpLocation("192.168.002.121");
	}
}

[欢乐极客]

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