博客 - Java检查网络是否连接

package com.modules.common;

​

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

​

/**

 * 判断网络连接状况.

 * 

 * @author wst(shi-tao.wen) 2022年2月17日 下午1:08:39

 *

 */

public class NetState {

​

	public void isConnect(final String ip) {

		try {

			new Thread(new Runnable() {

				@Override

				public void run() {

					try {

						// ping -t 长ping

						Process process = Runtime.getRuntime().exec("ping -t " + ip);

						InputStream is = process.getInputStream();

						InputStreamReader isr = new InputStreamReader(is, "GBK");

						BufferedReader br = new BufferedReader(isr);

						String line = null;

						StringBuffer sb = new StringBuffer();

						while ((line = br.readLine()) != null) {

							System.out.println(line);

							sb.append(line);

							sb.append("\r\n");

						}

						is.close();

						isr.close();

						br.close();

​

						System.out.println("");

						if (null != sb && !sb.toString().equals("")) {

							if (sb.toString().indexOf("TTL") > 0) {

								if (sb.toString().contains("数据包: 已发送 = 4，已接收 = 4，丢失 = 0 (0% 丢失)")) {

									System.out.println("网络畅通");

								} else {

									System.out.println("网络通,但是不稳定");

								}

							} else {

								System.out.println("网络不畅通");

							}

						}

					} catch (Exception e) {

						e.printStackTrace();

					}

				}

			}).start();

		} catch (Exception e) {

			e.printStackTrace();

		}

	}

​

	public static void main(String[] args) {

		NetState netState = new NetState();

		netState.isConnect("127.0.0.1");

		netState.isConnect("www.movcode.com");

		netState.isConnect("m.movcode.com");

		netState.isConnect("movcode.com");

	}

​

}