Java:如何为时间戳添加秒?
我无法为Java时间戳添加秒数。
我有这个,但是,它给了我相同的日期:
int sec = 600;java.sql.Timestamp ts_from_ws = new java.sql.Timestamp(retry_date);
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(ts_from_ws.getTime());
cal.add(Calendar.SECOND,sec);
java.sql.Timestamp ts_new_date_ws = new java.sql.Timestamp(cal.getTime().getTime());
回答:
您拥有的代码适合我。作为简短但完整的程序:
import java.util.*;import java.sql.*;
public class Test {
public static void main(String[] args) {
long retryDate = System.currentTimeMillis();
int sec = 600;
Timestamp original = new Timestamp(retryDate);
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(original.getTime());
cal.add(Calendar.SECOND, sec);
Timestamp later = new Timestamp(cal.getTime().getTime());
System.out.println(original);
System.out.println(later);
}
}
输出:
2011-11-07 10:27:45.3022011-11-07 10:37:45.302
请注意相差10分钟,即600秒。
当然,这样会损失亚毫秒级的精度,这可能不太理想-最初与我通常使用的时间戳背道而驰-但这 确实 增加了秒数…
另一种选择是Timestamp
直接使用:
Timestamp original = ...;Timestamp later = new Timestamp(original.getTime() + (sec * 1000L));
later.setNanos(original.getNanos());
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