判断网络是否连通

package com.adao.test.netping;

import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.URL;

public class InetJavaTest {
    private static String remoteInetAddr = "39.156.69.79";// 需要连接的IP地址

    /**
     * 传入需要连接的IP，返回是否连接成功
     * 
     * @param remoteInetAddr
     * @return
     */
    public static boolean isReachable(String remoteInetAddr) {
        boolean reachable = false;
        try {
            InetAddress address = InetAddress.getByName(remoteInetAddr);
            reachable = address.isReachable(5000);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return reachable;
    }

    // linux
//    public static final boolean isNodeReachable(String hostname) {
//        try {
//            return 0==Runtime.getRuntime().exec("ping -c 1 "+hostname).waitFor();
//        } catch (InterruptedException | IOException e) {
//            e.printStackTrace();
//            return false;
//        }
//    }

    public static void main(String[] args) {
        URL url = null;
        Boolean bon = false;
//        Boolean bon1 = false;
        try {
            url = new URL("http://baicu.com/");
            InputStream in = url.openStream();// 打开到此 URL 的连接并返回一个用于从该连接读入的 InputStream
            System.out.println("连接正常");
            in.close();// 关闭此输入流并释放与该流关联的所有系统资源。
        } catch (IOException e) {
            System.out.println("无法连接到：" + url.toString());
        }
        bon = isReachable(remoteInetAddr);
//        bon1 = isNodeReachable(remoteInetAddr);

        System.out.println("pingIP：" + bon);
    }
}

 完美