时间比较工具（时、分、秒）|Java

1. 新建 CompareUnit.java

package org.cs.base.utils.enm;  /**  * 时间比较单位枚举  * <p>  * HOUR,   //时  * <p>  * MINUTE, //分  * <p>  * SECOND  //秒  *  * @author admin  * @since 2022-4-25  */ public enum CompareUnit {     HOUR,   //时     MINUTE, //分     SECOND  //秒 }

2. 新建 CalendarUtils.java

package org.cs.base.utils;  import org.apache.log4j.Logger; import org.cs.base.utils.enm.CompareUnit;  import java.io.ByteArrayOutputStream; import java.io.PrintStream; import java.text.SimpleDateFormat; import java.util.Calendar;  /**  * 日期工具类  *  * @author admin  * @since 2022-04-25  */ public class CalendarUtils {    private static Logger log = Logger.getLogger(CalendarUtils.class);         /**      * 时间比较      *      * @param t1   时间1      * @param t2   时间2      * @param unit 单位      * @return      */     public static long compareTo(String t1, String t2, CompareUnit unit) {         long res;         SimpleDateFormat simpleDateFormat = new SimpleDateFormat(yyyy/MM/dd HH:mm:ss);         Calendar c1 = Calendar.getInstance();         Calendar c2 = Calendar.getInstance();         try {             c1.setTime(simpleDateFormat.parse(t1));             c2.setTime(simpleDateFormat.parse(t2));             long m1 = c1.getTime().getTime();             long m2 = c2.getTime().getTime();             switch (unit) {                 case SECOND:                     res = (m1 - m2) / 1000;                     break;                 case MINUTE:                     res = (m1 - m2) / 1000 / 60;                     break;                 case HOUR:                     res = (m1 - m2) / 1000 / 60 / 24;                     break;                 default:                     res = -1L;                     break;             }         } catch (Exception e) {             ByteArrayOutputStream bs = new ByteArrayOutputStream();             e.printStackTrace(new PrintStream(bs));             log.warn(bs);             res = -1L;         }         return res;     } }

3. 测试

public static void main(String[] args) throws ParseException {     String t1 = 2022/04/25 18:57:05;     String t2 = 2022/04/25 18:21:01;     System.out.println(时： + CalendarUtils.compareTo(t1, t2, CompareUnit.HOUR));     System.out.println(分： + CalendarUtils.compareTo(t1, t2, CompareUnit.MINUTE));     System.out.println(秒： + CalendarUtils.compareTo(t1, t2, CompareUnit.SECOND)); }