Java实现Socket之TimeClient

代码内容

从time.nist.gov服务器的37号端口得到时间信息，并对时间进行解析后显示出来

代码实现

/* TimeClient.java */

import java.io.*;

import java.net.*;

import java.util.Date;

public class TimeClient {

	public final static long differenceBetweenEpochs = 2208988800L;

	public static void main(String[] args) {

		try {

			/* 设置服务器地址和端口号 */

			InetAddress host = InetAddress.getByName("time.nist.gov");

			int port = 37;

			if (args.length > 0) {

				host  = InetAddress.getByName(args[0]);

			}

			/* 建立Socket连接 */

			Socket s = new Socket(host, port);

			/* 从Socket中读取数据 */

			InputStream raw = s.getInputStream();

			/* 时间转换 */

			long secondsSince1900 = 0;

			for (int i = 0; i < 4; i++) {

				secondsSince1900 = (secondsSince1900 << 8) | raw.read();

			}

			long secondsSince1970 = secondsSince1900 - differenceBetweenEpochs;

			long msSince1970 = secondsSince1970 * 1000;

			Date time = new Date(msSince1970);

			System.out.println("It is " + time);

		} catch (UnknownHostException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

	}

}

巴特西

Java实现Socket之TimeClient

Java实现Socket之TimeClient

代码内容

代码实现

运行截图

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