Pre Merge pull request !427 from mark/dev-master-threadlocal

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/context/SecurityContextHolder.java

@@ -15,7 +15,7 @@ import com.ruoyi.common.core.utils.StringUtils;
  */
 public class SecurityContextHolder
 {
-    private static final TransmittableThreadLocal<Map<String, Object>> THREAD_LOCAL = new TransmittableThreadLocal<>();
+    private static final TransmittableThreadLocal<Map<String, Object>> THREAD_LOCAL = TransmittableThreadLocal.withInitial(ConcurrentHashMap::new);
 
     public static void set(String key, Object value)
     {

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

@@ -1003,7 +1003,7 @@ public class ExcelUtil<T>
                 String separator = attr.separator();
                 if (StringUtils.isNotEmpty(dateFormat) && StringUtils.isNotNull(value))
                 {
-                    cell.getCellStyle().setDataFormat(this.wb.getCreationHelper().createDataFormat().getFormat(dateFormat));
+                    cell.setCellStyle(createCellStyle(cell.getCellStyle(), dateFormat));
                     cell.setCellValue(parseDateToStr(dateFormat, value));
                 }
                 else if (StringUtils.isNotEmpty(readConverterExp) && StringUtils.isNotNull(value))
@@ -1033,6 +1033,21 @@ public class ExcelUtil<T>
         return cell;
     }
 
+    /**
+     * 使用自定义格式，同时避免样式污染
+     * 
+     * @param cellStyle 从此样式复制
+     * @param format 格式匹配的字符串
+     * @return 格式化后CellStyle对象
+     */
+    private CellStyle createCellStyle(CellStyle cellStyle, String format)
+    {
+        CellStyle style = wb.createCellStyle();
+        style.cloneStyleFrom(cellStyle);
+        style.setDataFormat(wb.getCreationHelper().createDataFormat().getFormat(format));
+        return style;
+    }
+
     /**
      * 设置 POI XSSFSheet 单元格提示或选择框
      *