java 判断本机电脑是否能连接外网

java 判断本机电脑是否能连接外网

String host = "202.108.22.5";
int timeOut = 3000; //超时应该在3钞以上
boolean status = InetAddress.getByName(host).isReachable(timeOut);

当返回值是true时，说明host是可用的，反则不可。

//判断ip、端口是否可连接
    public static boolean isHostConnectable(String host, int port) {
        Socket socket = new Socket();
        try {
            socket.connect(new InetSocketAddress(host, port));
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        } finally {
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return true;
    }

    //判断ip是否可以连接 timeOut是超时时间
    public static boolean isHostReachable(String host, Integer timeOut) {
        try {
            return InetAddress.getByName(host).isReachable(timeOut);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }

//测试URL地址是否能正常连接
public static int testWsdlConnection(String address) throws Exception {
     int status = 404;
     try {
         URL urlObj = new URL(address);
         HttpURLConnection oc = (HttpURLConnection) urlObj.openConnection();
         oc.setUseCaches(false);
         oc.setConnectTimeout(3000); // 设置超时时间
         status = oc.getResponseCode();// 请求状态
         if (200 == status) {
             // 200是请求地址顺利连通。。
             return status;
         }
     } catch (Exception e) {
         e.printStackTrace();
         throw e;
     }
     return status;

}