方式一:

public static void main(String[] args) throws Exception {

URL url=new URL("http://www.bjtime.cn");//取得资源对象

URLConnection uc=url.openConnection();//生成连接对象

uc.connect(); //发出连接

long ld=uc.getDate(); //取得网站日期时间

Date date=new Date(ld); //转换为标准时间对象

//分别取得时间中的小时，分钟和秒，并输出

System.out.print(date.getHours()+"时"+date.getMinutes()+"分"+date.getSeconds()+"秒");

}

请求网络的权限：

方式二:

public class MainActivity extends Activity implements LocationListener{

private TextView tView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tView = (TextView) findViewById(R.id.tv);

LocationManager locMan = (LocationManager) this.getSystemService(MainActivity.LOCATION_SERVICE);

//获取最近一次知道的时间

//long networkTS = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER).getTime();

// 或者实时的获取时间：

locMan.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this); //获取当前时间

}

//当我们使用requestLocationUpdates时，我们需要实现LocationListener接口。

//在LocationListen的回调onLocationChanged当中获取时间

@Override

public void onLocationChanged(Location location) {

// TODO Auto-generated method stub

long time = location.getTime();

Date date = new Date(time);

tView.setText(time + " NETWORK_PROVIDER " + date);

//System.out.println(time + " NETWORK_PROVIDER " + date);

}

@Override

public void onProviderDisabled(String provider) {

// TODO Auto-generated method stub

}

@Override

public void onProviderEnabled(String provider) {

// TODO Auto-generated method stub

}

@Override

public void onStatusChanged(String provider, int status, Bundle extras) {

// TODO Auto-generated method stub

}

}