feat(excel): 支持导入发生时间字段并优化表头匹配

- 添加 occurrenceTime2 字段支持导入发生时间数据
- 实现表头单元格标准化处理，移除多余空格和特殊字符
- 解决因表头包含空白字符导致的列映射失败问题
- 支持对 "原告/上诉人" 等包含特殊分隔符的表头进行标准化
- 通过 WorkbookFactory 读取并重新写入 Excel 文件实现表头清理

src/main/java/com/gxwebsoft/credit/controller/CreditCourtAnnouncementController.java

@@ -410,11 +410,15 @@ public class CreditCourtAnnouncementController extends BaseController {
             ? param.getInvolvedAmount2()
             : param.getInvolvedAmount();
 
+        String occurrenceTime = !ImportHelper.isBlank(param.getOccurrenceTime2())
+            ? param.getOccurrenceTime2()
+            : param.getOccurrenceTime();
+
         entity.setDataType(dataType);
         entity.setPlaintiffAppellant(plaintiffAppellant);
         entity.setAppellee(param.getAppellee());
         entity.setOtherPartiesThirdParty(otherPartiesThirdParty);
-        entity.setOccurrenceTime(param.getOccurrenceTime());
+        entity.setOccurrenceTime(occurrenceTime);
         entity.setCaseNumber(param.getCaseNumber());
         entity.setCauseOfAction(param.getCauseOfAction());
         entity.setCourtName(param.getCourtName());

src/main/java/com/gxwebsoft/credit/controller/ExcelImportSupport.java

@@ -15,6 +15,8 @@ import org.apache.poi.ss.usermodel.WorkbookFactory;
 import org.springframework.util.CollectionUtils;
 import org.springframework.web.multipart.MultipartFile;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 import java.util.Collections;
 import java.util.HashMap;
@@ -267,7 +269,76 @@ public class ExcelImportSupport {
         importParams.setHeadRows(headRows);
         importParams.setStartSheetIndex(sheetIndex);
         importParams.setSheetNum(1);
-        return ExcelImportUtil.importExcel(file.getInputStream(), clazz, importParams);
+
+        // Easypoi matches headers by exact string. Some upstream files contain extra spaces/tabs/newlines in header cells
+        // (e.g. "原告 / 上诉人" or "原告/上诉人\t"), which makes specific columns silently not mapped.
+        // Normalize header cells first to make imports robust.
+        try (InputStream is = file.getInputStream(); Workbook workbook = WorkbookFactory.create(is)) {
+            if (workbook.getNumberOfSheets() > sheetIndex) {
+                Sheet sheet = workbook.getSheetAt(sheetIndex);
+                if (sheet != null) {
+                    normalizeHeaderCells(sheet, titleRows, headRows);
+                }
+            }
+            try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
+                workbook.write(bos);
+                try (ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray())) {
+                    return ExcelImportUtil.importExcel(bis, clazz, importParams);
+                }
+            }
+        }
+    }
+
+    private static void normalizeHeaderCells(Sheet sheet, int titleRows, int headRows) {
+        if (sheet == null || headRows <= 0) {
+            return;
+        }
+        int headerStart = Math.max(titleRows, 0);
+        int headerEnd = headerStart + headRows - 1;
+        for (int r = headerStart; r <= headerEnd; r++) {
+            Row row = sheet.getRow(r);
+            if (row == null) {
+                continue;
+            }
+            short last = row.getLastCellNum();
+            for (int c = 0; c < last; c++) {
+                Cell cell = row.getCell(c);
+                if (cell == null) {
+                    continue;
+                }
+
+                String text = null;
+                CellType type = cell.getCellType();
+                if (type == CellType.STRING) {
+                    text = cell.getStringCellValue();
+                } else if (type == CellType.FORMULA && cell.getCachedFormulaResultType() == CellType.STRING) {
+                    text = cell.getStringCellValue();
+                } else {
+                    continue;
+                }
+
+                String normalized = normalizeHeaderText(text);
+                if (normalized != null && !normalized.equals(text)) {
+                    cell.setCellValue(normalized);
+                }
+            }
+        }
+    }
+
+    private static String normalizeHeaderText(String text) {
+        if (text == null) {
+            return null;
+        }
+        // Remove common invisible whitespace characters, including full-width space.
+        return text
+            .replace("／", "/")
+            .replace(" ", "")
+            .replace("\t", "")
+            .replace("\r", "")
+            .replace("\n", "")
+            .replace("\u00A0", "")
+            .replace("　", "")
+            .trim();
     }
 
     private static <T> List<T> filterEmptyRows(List<T> rawList, Predicate<T> emptyRowPredicate) {

src/main/java/com/gxwebsoft/credit/param/CreditCourtAnnouncementImportParam.java

@@ -54,6 +54,9 @@ public class CreditCourtAnnouncementImportParam implements Serializable {
     @Excel(name = "刊登日期")
     private String occurrenceTime;
 
+    @Excel(name = "发生时间")
+    private String occurrenceTime2;
+
     @Excel(name = "备注")
     private String comments;