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) { } } }}

java获取本地局域网的外网IP

 需求：基本目标实现开机将本地的路由WAN口IP通知对方。

      思考：如果才能实现自动通知呢？

      首先，要有一个公共的空间，可以作为通知的载体。

      其次，需要传输机制把通知发出去。

      经过思考，我想到了电子邮件，邮箱是每个人都有的，email是可以用程度发的。于是需求变成了通过发邮件的方式把最新获取到的IP发出来。解决的思路有了，最大的问题是如何获取外网IP，开始尝试获取本地IP，这个显然是没用的，因为机器是在内网环境，获取到的只是内网IP，后来试图想通过获取外网 IP,比如访问一个XXX网站的形式来获取IP，这种网站还真不少，但是获取到的都是公网IP，学过网络的人都知道公网IP很少，往往只是在网络节点上的 IP，这种IP对我一个ADSL用户来说几乎就没任何意义。其实我需要的只是路由的WAN口IP。网上搜了一下，也没找到合适的。在几乎绝望的时候，我想到了代理，我能不能通过访问路由器的方式来获取IP呢，我试图用telnet登陆路由，试图用路由命令来操作路由，结果和我想象的一样，家用路由毕竟不是服务器级别的路由，根本没有对外提供的访问命令，只能通过web的方式来实现对路由的设置。自己再次陷入了绝望，后来我打开fireBug，试图找到IP 那个查看IP跳转的页面。结果被我找到了，http://192.168.1.1/userRpm/StatusRpm.htm，点开页面查看响应，传过来的就是网页的部分信息。OK，这就是我想要的IP。我突然兴奋起来，但是这似乎还不够，因为每次登陆路由时要输入用户名和密码。网上搜搜，这个其实不难，代理服务程序就那样写的。经过一晚上的思考和实践WAN口IP算是被我搞出来了。

package com.eehome.app.mail.utils;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.Authenticator;import java.net.URL;import java.util.regex.Matcher;import java.util.regex.Pattern;import com.eehome.app.mail.IMailConstant;import com.eehome.app.mail.model.RouterPassAuth;/** * @author wensong * 2010-9-4 下午03:34:58 */public class RouteIpUtils {	private final static RouteIpUtils routeIpUtils = new RouteIpUtils();			private RouteIpUtils() {	}	public static RouteIpUtils getInstance() {		//验证器工具的实例进行注册		Authenticator.setDefault(new RouterPassAuth());		return routeIpUtils;	}	public String getRouteIp() throws IOException {		StringBuffer wanPacket = getWanPacket();		return getFirstIp(wanPacket);	}	/**	 * 获得路由Web中的状态页面上的数据	 * 	 * @return	 * @throws IOException	 */	private StringBuffer getWanPacket() throws IOException {		URL url = new URL(IMailConstant.ROUTE_WEB_STATE);		InputStream ins = null;		try {			ins = url.openConnection().getInputStream();			BufferedReader reader = new BufferedReader(new InputStreamReader(ins));			String str;			boolean flag = false;			StringBuffer wanPacket = new StringBuffer();			int num = 3;			while ((str = reader.readLine()) != null && num > 0) {				if (str.contains("var wanPara = new Array(")) {					flag = true;				}				if (flag) {					wanPacket.append(str);					num--;				}			}			return wanPacket;		}finally{			if(ins!=null){				ins.close();			}		}	}	private String getFirstIp(StringBuffer wanPacket) {		// 找出数据包中第一个匹配的IP,即为Ip		Pattern p = Pattern.compile("\\d+\\.\\d+\\.\\d+\\.\\d+");		Matcher m = p.matcher(wanPacket);		if (m.find()) {			return m.group();		} else {			return null;		}	}		public static void main(String[] args) {		try {			System.out.println(RouteIpUtils.getInstance().getRouteIp());		} catch (IOException e) {			// TODO Auto-generated catch block			e.printStackTrace();		}	}}

package com.eehome.app.mail;public interface IMailConstant {	/**	 * 发件人地址	 */	public final static String NOTIFY_EMAIL_MESSAGE_FROM = "wensong1987@126.com";	/**	 * 提醒邮件标题前缀	 */	public final static String NOTIFY_EMAIL_MESSAGE_PRE_TITLE = "通知：服务器IP提醒————";	/**	 * 路由用户名	 */	public final static String ROUTE_USER = "admin";	/**	 * 路由密码	 */	public final static String ROUTE_PWD = "huang";	/**	 * 路由Web记录状态的页面，里面包含了Wan口ip	 */	public final static String ROUTE_WEB_STATE = "http://192.168.1.1:83/userRpm/StatusRpm.htm?Connect=连 接&wan=1";	/**	 * 轮询时间 10分钟	 */	public final static long POLLING_TIME = 10 * 60 * 1000;	/**	 * email文件地址	 */	public final static String EMAIL_FILE_PATH = "/root/mail/mail.txt";	/**	 * log4j存放地址	 */	public final static String LOG4J_FILE_PATH = "/root/mail/log/log4j.properties";	/**	 * 匹配email的正则	 */	public final static String EMAIL_REG = "[A-Za-z0-9](?:[0-9a-zA-Z_]?\\.?){4,24}@[0-9a-zA-Z_-]{1,59}\\.(?:[0-9a-zA-Z]\\.?[0-9a-zA-Z]?){2,3}";}

package com.eehome.app.mail.model;import java.net.Authenticator;import java.net.PasswordAuthentication;import com.eehome.app.mail.IMailConstant;public class RouterPassAuth extends Authenticator {		@Override	public PasswordAuthentication getPasswordAuthentication() {		return new PasswordAuthentication(IMailConstant.ROUTE_USER,				IMailConstant.ROUTE_PWD.toCharArray());	}}

      考虑到路由IP是动态IP，过一段时间就会变化，我给程序设计了一个轮询机制来检测IP,变化，用一个调度任务来定时获取IP，进行比较，再决定是否发送邮件。

package com.eehome.app.mail.task;import java.io.IOException;import java.util.Arrays;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.apache.log4j.PropertyConfigurator;import org.springframework.beans.factory.BeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.mail.javamail.JavaMailSender;import com.eehome.app.mail.IMailConstant;import com.eehome.app.mail.model.IpNotifyMessage;import com.eehome.app.mail.utils.RouteIpUtils;/** * 邮件提醒任务 * @author wensong * 2010-9-5 下午11:12:17 */public class NotifyEmailSendTask implements Runnable {	private String[] toMails;	private Log logger = LogFactory.getLog(this.getClass());	private static String ip = "192.168.1.110";	static {		PropertyConfigurator.configure(IMailConstant.LOG4J_FILE_PATH);	}	private static BeanFactory factory = new ClassPathXmlApplicationContext(			"application-context.xml");	public NotifyEmailSendTask(String[] toMails) {		this.toMails = toMails;	}	public void run() {		String routerIp = null;		try {			routerIp = RouteIpUtils.getInstance().getRouteIp();		} catch (IOException e1) {			logger.warn("连接路由中断，或者路由连接异常:" + e1);		}		try {			if (routerIp != null&&!routerIp.equals("0.0.0.0")) {				if (!routerIp.equals(ip)) {					if (!ip.equals("192.168.1.110"))						logger.info("路由IP发生变化，执行发送邮件任务");					StringBuffer context = new StringBuffer().append(							"今日Host:\n").append("eehome.com  ")							.append(routerIp);					if (!ip.equals("192.168.1.110")) {						context = new StringBuffer().append("Host变化如下：\n")								.append("eehome.com  ").append(routerIp);					}					// 构造邮件消息对象					IpNotifyMessage message = new IpNotifyMessage(toMails,							context.toString());					// 发邮件					JavaMailSender mailSender = (JavaMailSender) factory							.getBean("javaMailSender");					logger.info("发送邮件,发送邮箱为：" + Arrays.toString(toMails));					mailSender.send(message);					ip = routerIp;				} else {					logger.debug("上次记录的IP为：" + ip + ", 最新路由IP为:" + routerIp							+ " 轮询结果将不发送邮件");				}			}		} catch (Exception e) {			logger.warn("发送邮件异常:" + e);		}	}}

package com.eehome.app.mail.task;import java.util.concurrent.TimeUnit;import com.eehome.app.mail.IMailConstant;import com.eehome.app.mail.utils.EmailsProvider;import com.eehome.core.task.EeHomeScheduledExecutor;/** * 邮件任务调度，采用轮询的方式来检查路由IP是否发生改变，如果改变发送邮件 *  * @author wensong 2010-9-4 下午03:34:58 */public class IpNotifyEmailSchedule {	public static void main(String[] args) {		String[] mails = EmailsProvider.getInstance().getEmailArrays();		EeHomeScheduledExecutor.getScheduledExecutor().scheduleWithFixedDelay(				new NotifyEmailSendTask(mails), 0, IMailConstant.POLLING_TIME,				TimeUnit.MILLISECONDS);	}}

package com.eehome.app.mail.model;import java.util.Date;import org.springframework.mail.SimpleMailMessage;import com.eehome.app.mail.IMailConstant;import com.eehome.app.mail.utils.DateUtils;public class IpNotifyMessage extends SimpleMailMessage {	private static final long serialVersionUID = -3236307360187426650L;	public IpNotifyMessage(String toMail, String toText) {		// 设置邮件标题：提醒邮件标题前缀+当前时间		setSubject(IMailConstant.NOTIFY_EMAIL_MESSAGE_PRE_TITLE				+ DateUtils.getTimeNow());		setFrom(IMailConstant.NOTIFY_EMAIL_MESSAGE_FROM);		setSentDate(new Date());		setTo(toMail);		setText(toText);	}		public IpNotifyMessage(String[] toMails,String toText){		// 设置邮件标题：提醒邮件标题前缀+当前时间		setSubject(IMailConstant.NOTIFY_EMAIL_MESSAGE_PRE_TITLE				+ DateUtils.getTimeNow());		setFrom(IMailConstant.NOTIFY_EMAIL_MESSAGE_FROM);		setSentDate(new Date());		setTo(toMails);		setText(toText);	}}

package com.eehome.app.mail.exception;public class FileIsNotExistException extends Exception {	/**	 * 文件不存在异常	 */	private static final long serialVersionUID = -2545287258814097123L;	public FileIsNotExistException() {		super();	}	public FileIsNotExistException(String message, Throwable cause) {		super(message, cause);	}	public FileIsNotExistException(String message) {		super(message);	}	public FileIsNotExistException(Throwable cause) {		super(cause);	}}

package com.eehome.app.mail.utils;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.List;import java.util.regex.Matcher;import java.util.regex.Pattern;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.apache.log4j.PropertyConfigurator;import com.eehome.app.mail.IMailConstant;public class EmailsProvider {	private final static EmailsProvider provider = new EmailsProvider();	private Log logger = LogFactory.getLog(this.getClass());	static {		PropertyConfigurator.configure(IMailConstant.LOG4J_FILE_PATH);	}	private EmailsProvider() {	}	public static EmailsProvider getInstance() {		return provider;	}	/**	 * 获得Email数组	 * 	 * @return	 */	public String[] getEmailArrays() {		StringBuilder sb = getEmailStrBuilder();		if (sb != null) {			List
    
      mailArrays = getEmails(sb);			return (String[]) mailArrays.toArray(new String[mailArrays.size()]);		} else {			return null;		}	}	/**	 * 从指定email配置中获取email	 * 	 * @return	 */	private StringBuilder getEmailStrBuilder() {		File file = new File(IMailConstant.EMAIL_FILE_PATH);		InputStream ins = null;		StringBuilder stringBuilder = new StringBuilder();		try {			ins = new FileInputStream(file);			BufferedReader reader = new BufferedReader(new InputStreamReader(					ins));			String str;			while ((str = reader.readLine()) != null) {				stringBuilder.append(str).append(",");			}			return stringBuilder;		} catch (FileNotFoundException e) {			logger.info(file.getPath() + "文件不存在");			return null;		} catch (IOException e) {			logger.info("文件操作异常：" + e);			return null;		} finally {			try {				ins.close();			} catch (IOException e) {				logger.info("文件关闭异常：" + e);				return null;			}		}	}	/**	 * 通过正则匹配字符	 * @param stringBuilder	 * @return	 */	private List
     
       getEmails(StringBuilder stringBuilder) {		List
      
        mails = new ArrayList
       
        ();		// 创建正则表达式		Pattern p = Pattern.compile(IMailConstant.EMAIL_REG);		Matcher m = p.matcher(stringBuilder);		if (logger.isDebugEnabled()) {			logger.debug("文件读取的字符串stringBuilder:" + stringBuilder);		}		// 找到匹配的字符串		while (m.find()) {			mails.add(m.group());		}		return mails;	}}
       
      
     
    

package com.eehome.app.mail.utils;import java.text.SimpleDateFormat;import java.util.Date;public class DateUtils {	public static final SimpleDateFormat sdf = new SimpleDateFormat(			"yyyyMMddHHmmss");	/**	 * 获得当前时间组成的字符串，格式为yyyyMMddHHmmss	 * @return	 */	public static String getTimeNow() {		return sdf.format(new Date());	}}

package com.eehome.app.mail.exception;public class FileIsNotExistException extends Exception {	/**	 * 文件不存在异常	 */	private static final long serialVersionUID = -2545287258814097123L;	public FileIsNotExistException() {		super();	}	public FileIsNotExistException(String message, Throwable cause) {		super(message, cause);	}	public FileIsNotExistException(String message) {		super(message);	}	public FileIsNotExistException(Throwable cause) {		super(cause);	}}

      接着为了写了一个shell脚本，把它作为一个后台执行的脚本，放到rc.local下，让其开机启动，这样IP邮件提醒的程序大功告成，呵呵。