java 获取当前时区

import java.util.Calendar;
import java.util.TimeZone;

/**
 * TODO
 *获取时区
 * @author wangchw
 * version
 * @date 2021/1/18 14:25
 */
public class Demo {
    public static void main(String[] args) {
        Calendar ca = Calendar.getInstance();
        TimeZone tz = ca.getTimeZone();
        System.out.println(tz.getID());
    }
}