java 获取局域网内IP

Java，如何获取局域网内所有的ip呢？

如何扫描局域网内的所有ip呢？

代码如下：

package com.jn.lan;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.util.StringTokenizer;
import java.util.Vector;

import com.common.util.SystemHWUtil;
import com.string.widget.util.ValueWidget;

public class LANIP {
    public static InetAddress[] getAllOnline() {
        // TODO Auto-generated method stub
        Vector v = new Vector(50);
        try {
            // Process process1 =
            // Runtime.getRuntime().exec("ping -w 2 -n 1 192.168.1.%i");
            // process1.destroy();
            Process process = Runtime.getRuntime().exec("arp -a");
            InputStreamReader inputStr = new InputStreamReader(
                    process.getInputStream(), "GBK");
            BufferedReader br = new BufferedReader(inputStr);
            String temp = "";
            br.readLine();
            br.readLine();
            br.readLine();// 此后开始读取IP地址，之前为描述信息，忽略。
            while ((temp = br.readLine()) != null) {
                System.out.println(temp);
                if (!ValueWidget.isNullOrEmpty(temp)) {
                    StringTokenizer tokens = new StringTokenizer(temp);
                    String x;
                    InetAddress add=null;
                    try {
                        add = InetAddress.getByName(x = tokens
                                .nextToken());
                    } catch (java.net.UnknownHostException e) {
                        continue;
                    }
                    // System.out.println(x);
                    v.add(add);
                    // System.out.println(add);
                }
            }
            System.out.println(SystemHWUtil.DIVIDING_LINE);
            v.add(InetAddress.getLocalHost());
            process.destroy();
            br.close();
            inputStr.close();
        } catch (Exception e) {
            System.out.println("可能是网络不可用。");
            e.printStackTrace();
        }
        int cap = v.size();
        InetAddress[] addrs = new InetAddress[cap];
        for (int i = 0; i < cap; i++) {
            addrs[i] = (InetAddress) v.elementAt(i);
             System.out.println(addrs[i]);
        }
        return addrs;

    }

    public static void main(String args[]) {
        InetAddress[] i = new LANIP().getAllOnline();
    }
}

 运行结果：

  169.254.255.255       ff-ff-ff-ff-ff-ff     静态
  224.0.0.2             01-00-5e-00-00-02     静态
  224.0.0.22            01-00-5e-00-00-16     静态
  224.0.0.252           01-00-5e-00-00-fc     静态
  226.81.9.8            01-00-5e-51-09-08     静态
  239.255.255.250       01-00-5e-7f-ff-fa     静态
  255.255.255.255       ff-ff-ff-ff-ff-ff     静态

接口: 169.254.190.162 --- 0xd
  Internet 地址         物理地址              类型
  169.254.255.255       ff-ff-ff-ff-ff-ff     静态
  224.0.0.2             01-00-5e-00-00-02     静态
  224.0.0.22            01-00-5e-00-00-16     静态
  224.0.0.252           01-00-5e-00-00-fc     静态
  226.81.9.8            01-00-5e-51-09-08     静态
  239.255.255.250       01-00-5e-7f-ff-fa     静态
  255.255.255.255       ff-ff-ff-ff-ff-ff     静态

接口: 192.168.1.105 --- 0x14
  Internet 地址         物理地址              类型
  192.168.1.1           00-21-5d-3c-79-16     动态
  192.168.1.106         b8-76-3f-a6-a8-e9     动态
  192.168.1.109         60-d8-19-14-6c-55     动态
  192.168.1.110         00-21-5d-3c-79-16     动态
  192.168.1.255         ff-ff-ff-ff-ff-ff     静态
  224.0.0.2             01-00-5e-00-00-02     静态
  224.0.0.22            01-00-5e-00-00-16     静态
  224.0.0.252           01-00-5e-00-00-fc     静态
  239.255.255.250       01-00-5e-7f-ff-fa     静态
  255.255.255.255       ff-ff-ff-ff-ff-ff     静态

接口: 192.168.137.1 --- 0x15
  Internet 地址         物理地址              类型
  192.168.137.182       84-7a-88-cf-87-35     动态
  192.168.137.255       ff-ff-ff-ff-ff-ff     静态
  224.0.0.2             01-00-5e-00-00-02     静态
  224.0.0.22            01-00-5e-00-00-16     静态
  224.0.0.252           01-00-5e-00-00-fc     静态
  239.255.255.250       01-00-5e-7f-ff-fa     静态
  255.255.255.255       ff-ff-ff-ff-ff-ff     静态
---------------------------------------
/169.254.255.255
/224.0.0.2
/224.0.0.22
/224.0.0.252
/226.81.9.8
/239.255.255.250
/255.255.255.255
/169.254.255.255
/224.0.0.2
/224.0.0.22
/224.0.0.252
/226.81.9.8
/239.255.255.250
/255.255.255.255
/192.168.1.1
/192.168.1.106
/192.168.1.109
/192.168.1.110
/192.168.1.255
/224.0.0.2
/224.0.0.22
/224.0.0.252
/239.255.255.250
/255.255.255.255
/192.168.137.182
/192.168.137.255
/224.0.0.2
/224.0.0.22
/224.0.0.252
/239.255.255.250
/255.255.255.255
wh-THINK/169.254.86.27