!160 【轻量级pr】poi ExcelUtil 增加对java8 日期的支持

Merge pull request !160 from dazer007/excelUtil_add_java8_date

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/DateUtils.java

@@ -3,6 +3,7 @@ package com.ruoyi.common.core.utils;
 import java.lang.management.ManagementFactory;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.time.*;
 import java.util.Date;
 import org.apache.commons.lang3.time.DateFormatUtils;
 
@@ -152,4 +153,23 @@ public class DateUtils extends org.apache.commons.lang3.time.DateUtils
         // long sec = diff % nd % nh % nm / ns;
         return day + "天" + hour + "小时" + min + "分钟";
     }
+
+    /**
+     * 增加 LocalDateTime ==> Date
+     */
+    public static Date toDate(LocalDateTime temporalAccessor)
+    {
+        ZonedDateTime zdt = temporalAccessor.atZone(ZoneId.systemDefault());
+        return Date.from(zdt.toInstant());
+    }
+
+    /**
+     * 增加 LocalDate ==> Date
+     */
+    public static Date toDate(LocalDate temporalAccessor)
+    {
+        LocalDateTime localDateTime = LocalDateTime.of(temporalAccessor, LocalTime.of(0, 0, 0));
+        ZonedDateTime zdt = localDateTime.atZone(ZoneId.systemDefault());
+        return Date.from(zdt.toInstant());
+    }
 }

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java

@@ -6,6 +6,8 @@ import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.math.BigDecimal;
 import java.text.DecimalFormat;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Comparator;
@@ -282,7 +284,7 @@ public class ExcelUtil<T>
                             String dateFormat = field.getAnnotation(Excel.class).dateFormat();
                             if (StringUtils.isNotEmpty(dateFormat))
                             {
-                                val = DateUtils.parseDateToStr(dateFormat, (Date) val);
+                                val = this.parseDateToStr(dateFormat, (Date) val);
                             }
                             else
                             {
@@ -701,7 +703,7 @@ public class ExcelUtil<T>
                 String separator = attr.separator();
                 if (StringUtils.isNotEmpty(dateFormat) && StringUtils.isNotNull(value))
                 {
-                    cell.setCellValue(DateUtils.parseDateToStr(dateFormat, (Date) value));
+                    cell.setCellValue(this.parseDateToStr(dateFormat, (Date) value));
                 }
                 else if (StringUtils.isNotEmpty(readConverterExp) && StringUtils.isNotNull(value))
                 {
@@ -1154,4 +1156,29 @@ public class ExcelUtil<T>
         }
         return true;
     }
+
+    /**
+     * 增加ExcelUtil对java8 日期的支持
+     * 格式化日期，日期可能是：{@link Date}、{@link LocalDateTime}、 {@link LocalDate} 其他日期暂不支持
+     * @param dateFormat 日期格式
+     * @param val 被格式化的日期对象
+     * @see DateUtils#parseDateToStr(String, Date)
+     */
+    private String parseDateToStr(final String dateFormat, Object val)
+    {
+        if (val == null) {
+            return "";
+        }
+        String str;
+        if (val instanceof Date) {
+            str = DateUtils.parseDateToStr(dateFormat, (Date) val);
+        } else if (val instanceof LocalDateTime) {
+            str = DateUtils.parseDateToStr(dateFormat, DateUtils.toDate((LocalDateTime) val));
+        } else if (val instanceof LocalDate) {
+            str = DateUtils.parseDateToStr(dateFormat, DateUtils.toDate((LocalDate) val));
+        } else {
+            str = val.toString();
+        }
+        return str;
+    }
 }