windows中可以通过在cmd中使用ping命令来检测网络连接状况,如下：
网络连接正常时：
网络未连接时：
在java中可以通过调用ping命令来判断网络是否连接正常：
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package module.system.common;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;/** * 判断网络连接状况. * @author nagsh * */public class NetState { public boolean isConnect(){ boolean connect = false; Runtime runtime = Runtime.getRuntime(); Process process; try { process = runtime.exec("ping " + "www.baidu.com"); InputStream is = process.getInputStream(); InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String line = null; StringBuffer sb = new StringBuffer(); while ((line = br.readLine()) != null) { sb.append(line); } System.out.println("返回值为:"+sb); is.close(); isr.close(); br.close(); if (null != sb && !sb.toString().equals("")) { String logString = ""; if (sb.toString().indexOf("TTL") > 0) { // 网络畅通 connect = true; } else { // 网络不畅通 connect = false; } } } catch (IOException e) { e.printStackTrace(); } return connect; } public static void main(String[] args) { NetState netState = new NetState(); System.out.println(netState.isConnect()); }} |