处理40个工作日的日期问题

src/main/java/cn/chjyj/szwh/utils/DateUtils.java

@@ -15,17 +15,18 @@ import java.util.Date;
 public class DateUtils {
     /**
      * 时间转换成时间戳,参数和返回值都是字符串
-     * @param  s
+     *
+     * @param s
      * @return res
      * @throws ParseException
      */
-    public static long dateToStamp(String s)  {
+    public static long dateToStamp(String s) {
         SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         try {
             Date date = simpleDateFormat.parse(s);
             long ts = date.getTime();
             return ts;
-        }catch (ParseException ex){
+        } catch (ParseException ex) {
             ex.printStackTrace();
         }
         return 0l;
@@ -49,6 +50,7 @@ public class DateUtils {
 
     /**
      * 获取一个月的总天数
+     *
      * @param date
      * @return
      */
@@ -60,18 +62,25 @@ public class DateUtils {
 
     /**
      * 指定日期的前后几天 工作日
+     *
      * @param oneday 特定日期
      * @param amount 天数 前几天参数amount为负整数
      * @return
      */
-    public static Date daysAgoOrAfter(Date oneday,int amount){
+    public static Date daysAgoOrAfter(Date oneday, int amount) {
         Calendar mon = Calendar.getInstance();
         mon.setTime(oneday);
         //如果今天是周六或周日
-        if (Calendar.SATURDAY == mon.get(Calendar.SATURDAY) || Calendar.SUNDAY == mon.get(Calendar.SUNDAY)) {
-            amount=amount+1;
+//        if (Calendar.SATURDAY == mon.get(Calendar.SATURDAY) || Calendar.SUNDAY == mon.get(Calendar.SUNDAY)) {
+//            amount=amount+1;
+//        }
+        // 最后得到的日子如果是周日 周六
+        if (Calendar.SATURDAY == mon.get(Calendar.SATURDAY)) {
+            amount+=2;
+        }
+        if (Calendar.SUNDAY == mon.get(Calendar.SUNDAY)) {
+            amount+=1;
         }
-
         // 逢周六周日，日期延后一天
         for (int i = 0; i < amount; i++) {
             mon.set(Calendar.DATE, mon.get(Calendar.DATE) + 1);
@@ -86,10 +95,11 @@ public class DateUtils {
     /**
      * 日期本地化
      * note:Date对象表示特定的日期和时间，而LocalDate(Java8)对象只包含没有任何时间信息的日期。
+     *
      * @param date
      * @return
      */
-    public static LocalDateTime convertDateToLocalDateTime(Date date){
+    public static LocalDateTime convertDateToLocalDateTime(Date date) {
         // 系统时区
         ZoneId zoneId = ZoneId.systemDefault();
         Instant instant = date.toInstant();

src/main/java/cn/chjyj/szwh/utils/WorkDayUtil.java

@@ -0,0 +1,71 @@
+package cn.chjyj.szwh.utils;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
+
+/**
+ * 工作日工具类
+ */
+public class WorkDayUtil {
+    /**
+     * 日期格式
+     */
+    public static SimpleDateFormat SDF = new SimpleDateFormat("yyyy-MM-dd");
+
+    /**
+     * 获取工作日时间
+     *
+     * @param startDate 起始时间
+     * @param num       num个工作日
+     * @return
+     */
+    public static Date getWorkDay(Date startDate, int num) {
+        Date tomorrow = null;
+        int delay = 0;
+        while (delay < num-1) {
+            tomorrow = getTomorrow(startDate);
+            if (!isWeekend(SDF.format(tomorrow))) {
+                delay++;
+            }
+            startDate = tomorrow;
+        }
+        return startDate;
+    }
+
+    /**
+     * 判断日期字符串是否为周末
+     *
+     * @param dateString 日期字符串
+     * @return
+     */
+    private static boolean isWeekend(String dateString){
+        boolean zm=false;
+        try {
+            Date date = SDF.parse(dateString);
+            Calendar cal = Calendar.getInstance();
+            cal.setTime(date);
+            //return cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY || cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY;
+            if(cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY || cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY){
+                zm=true;
+            }
+        }catch (ParseException ex){
+            ex.printStackTrace();
+        }
+        return zm;
+    }
+
+    /**
+     * 获取tomorrow的日期
+     *
+     * @param startDate 起始时间
+     * @return
+     */
+    private static Date getTomorrow(Date startDate) {
+        Calendar cal = Calendar.getInstance();
+        cal.setTime(startDate);
+        cal.add(Calendar.DAY_OF_MONTH, +1);
+        return cal.getTime();
+    }
+}

src/test/java/cn/chjyj/szwh/NewTest.java

@@ -3,6 +3,7 @@ package cn.chjyj.szwh;
 import cn.chjyj.szwh.mapper.FestivalsMapper;
 import cn.chjyj.szwh.utils.DateUtils;
 import cn.chjyj.szwh.utils.SzFileUtils;
+import cn.chjyj.szwh.utils.WorkDayUtil;
 import com.alibaba.fastjson2.JSONObject;
 import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
@@ -106,13 +107,15 @@ public class NewTest {
     public void n2test(){
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
         try {
-            Date startd = sdf.parse("2022-10-18");
-            Date afdate = DateUtils.daysAgoOrAfter(startd,5);
-            System.out.println(sdf.format(afdate));
-
+            Date startd = sdf.parse("2022-10-17");
+            Date afdate =WorkDayUtil.getWorkDay(startd,40);
+            //Date afdate = DateUtils.daysAgoOrAfter(startd,40);
+            System.out.println("40工作日后的日期："+sdf.format(afdate));
         }catch (Exception ex){
             ex.printStackTrace();
         }
+
+
     }
 
     /**

urls.md

@@ -40,4 +40,8 @@
 
 19. [SpringBoot设置动态定时任务](blog.csdn.net/wl_Honest/article/details/123654621)
 
-20. [java取n个工作日后的日期](https://www.cnblogs.com/yadongliang/p/9549349.html)
+20. [java取n个工作日后的日期](https://www.cnblogs.com/yadongliang/p/9549349.html)
+
+21. [JAVA获取N个工作日后的时间的工具类、考虑上班时间、时区](https://blog.csdn.net/qq_37136334/article/details/121381277)
+
+22.[Java获取n天后的工作日时间](https://www.minedeed.com/Java/13.html)