test，read IP

佳明 — Sun, 08 Jul 2012 16:32:00 GMT

import java.io.*;
import java.net.InetAddress;
import java.util.*;

public class ReadIp {
    static public HashMap ping; // ping 后的结果集

    public HashMap getPing() { // 用来得到ping后的结果集
        return ping;
    }

    // 当前线程的数量, 防止过多线程摧毁电脑
    static int threadCount = 0;

    public ReadIp() {
        ping = new HashMap();
    }

    public void Ping(String ip) throws Exception {
        // 最多30个线程
        while (threadCount > 30)
            Thread.sleep(50);
        threadCount += 1;
        PingIp p = new PingIp(ip);
        p.start();
    }

    public void PingAll() throws Exception {
        // 首先得到本机的IP，得到网段
        //InetAddress host = InetAddress.getLocalHost();
        //InetAddress host = InetAddress.getByName(null);
        InetAddress host = InetAddress.getByName("127.0.0.1");
        String hostAddress = host.getHostAddress();
        int k = 0;
        k = hostAddress.lastIndexOf(".");
        String ss = hostAddress.substring(0, k + 1);
        for (int i = 1; i <= 255; i++) { // 对所有局域网Ip
            String iip = ss + i;
            Ping(iip);
        }

        // 等着所有Ping结束
        while (threadCount > 0)
            Thread.sleep(50);
    }

    public static void main(String[] args) throws Exception {
        ReadIp ip = new ReadIp();
        ip.PingAll();
        Set entries = ping.entrySet();
        Iterator iter = entries.iterator();

        String k;
        while (iter.hasNext()) {
            Map.Entry entry = (Map.Entry) iter.next();
            String key = (String) entry.getKey();
            String value = (String) entry.getValue();

            if (value.equals("true"))
                System.out.println(key + "-->" + value);
        }
    }

    class PingIp extends Thread {
        public String ip; // IP

        public PingIp(String ip) {
            this.ip = ip;
        }

        public void run() {
            try {
                Process p = Runtime.getRuntime().exec(
                        "ping " + ip + " -w 300 -n 1");
                InputStreamReader ir = new InputStreamReader(p.getInputStream());
                LineNumberReader input = new LineNumberReader(ir);
                // 读取结果行
                for (int i = 1; i < 7; i++)
                    input.readLine();
                String line = input.readLine();

                if (line.length() < 17
                        || line.substring(8, 17).equals("timed out"))
                    ping.put(ip, "false");
                else
                    ping.put(ip, "true");

                // 线程结束
                threadCount -= 1;
            } catch (IOException e) {
            }
        }
    }
}

佳明 2012-07-09 00:32 发表评论

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test，read IP