在android中从互联网获取当前日期

Question

我想知道 android 中是否有任何 API/类可以为我们提供原始日期，因为我不想从 android 设备获取日期/时间。

Answer 1

更新！！

旧答案不起作用，因为 timeapi.org 已关闭。

这是我的新 getTime 方法。它正在使用 JSOUP。

private long getTime() throws Exception {
    String url = "https://time.is/Unix_time_now";
    Document doc = Jsoup.parse(new URL(url).openStream(), "UTF-8", url);
    String[] tags = new String[] {
            "div[id=time_section]",
            "div[id=clock0_bg]"
    };
    Elements elements= doc.select(tags[0]);
    for (int i = 0; i <tags.length; i++) {
        elements = elements.select(tags[i]);
    }
    return Long.parseLong(elements.text());
}

将时间戳转换为可读的日期和时间

private String getDate(long time) {
    Calendar cal = Calendar.getInstance(Locale.ENGLISH);
    cal.setTimeInMillis(time * 1000);
    SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy hh:mm a", Locale.ENGLISH);
    
    return dateFormat.format(cal.getTime());
} 

分级：

implementation 'org.jsoup:jsoup:1.10.2'

Answer 2

使用这个

public String getTime() {
try{
    //Make the Http connection so we can retrieve the time
    HttpClient httpclient = new DefaultHttpClient();
    // I am using yahoos api to get the time
    HttpResponse response = httpclient.execute(new
    HttpGet("http://developer.yahooapis.com/TimeService/V1/getTime?appid=YahooDemo"));
    StatusLine statusLine = response.getStatusLine();
    if(statusLine.getStatusCode() == HttpStatus.SC_OK){
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        response.getEntity().writeTo(out);
        out.close();
        // The response is an xml file and i have stored it in a string
        String responseString = out.toString();
        Log.d("Response", responseString);
        //We have to parse the xml file using any parser, but since i have to 
        //take just one value i have deviced a shortcut to retrieve it
        int x = responseString.indexOf("<Timestamp>");
        int y = responseString.indexOf("</Timestamp>");
        //I am using the x + "<Timestamp>" because x alone gives only the start value
        Log.d("Response", responseString.substring(x + "<Timestamp>".length(),y) );
        String timestamp =  responseString.substring(x + "<Timestamp>".length(),y);
        // The time returned is in UNIX format so i need to multiply it by 1000 to use it
        Date d = new Date(Long.parseLong(timestamp) * 1000);
        Log.d("Response", d.toString() );
        return d.toString() ;
    } else{
        //Closes the connection.
        response.getEntity().getContent().close();
        throw new IOException(statusLine.getReasonPhrase());
    }
}catch (ClientProtocolException e) {
Log.d("Response", e.getMessage());
}catch (IOException e) {
Log.d("Response", e.getMessage());
}
return null;
}

Answer 3

您可以使用以下程序从互联网时间服务器获取时间

    import java.io.IOException;

    import org.apache.commons.net.time.TimeTCPClient; 

    public final class GetTime { 

        public static final void main(String[] args) {
            try { 
                TimeTCPClient client = new TimeTCPClient();
                try { 
                    // Set timeout of 60 seconds 
                    client.setDefaultTimeout(60000);
                    // Connecting to time server 
                    // Other time servers can be found at : http://tf.nist.gov/tf-cgi/servers.cgi# 
                    // Make sure that your program NEVER queries a server more frequently than once every 4 seconds 
                    client.connect("nist.time.nosc.us");
                    System.out.println(client.getDate());
                } finally { 
                    client.disconnect();
                } 
            } catch (IOException e) {
                e.printStackTrace();
            } 
        } 
    } 

1.您需要 Apache Commons Net 库才能使其工作。下载库并添加到您的项目构建路径。

（或者你也可以在这里使用修剪过的 Apache Commons Net Library：https://www.dropbox.com/s/bjxjv7phkb8xfhh/commons-net-3.1.jar。这足以从互联网上获得时间）

Answer 4

您可以使用android.net.sntp.SntpClient 类。

SntpClient client = new SntpClient();
int timeout = 50000;
if (client.requestTime("time-a.nist.gov", timeout)) {
    long time = client.getNtpTime();
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(time);
    calendar.getTime();  // this should be your date
}