How to solve the problem of data overwriting and style loss of merged cells when populating Excel templates with EasyExcel?

EasyExcel populates Excel template: Cleverly solves the problem of merging cells

When using EasyExcel to process Excel templates containing merged cells, you often face the challenges of data overwriting and style loss. This article will explore these issues in depth and provide effective solutions.

Problem analysis

During EasyExcel populating Excel templates, if the template contains merged cells, the following may occur:

1. Data is overwritten: When new data is written, the data in the original merged cell is replaced, causing information to be lost.
2. Style missing: The formatting settings of the merged cells (such as background color, font style) disappear after filling.

Solution

To address the above problems, we can solve them by customizing WriteHandler :

1. Prevent data overwriting: Custom WriteHandler , read the original content in the merged cell before writing data, and merge the new data with the original data or process it in other ways to avoid data loss. The following is a sample code snippet (need to be adjusted according to actual conditions):

 public class MergeCellHandler implements WriteHandler {
    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List <writecelldata> > cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
        if (cell != null && cell.getSheet().getWorkbook() instanceof XSSFWorkbook) {
            XSSFSheet sheet = (XSSFSheet) cell.getSheet();
            for (int i = sheet.getNumMergedRegions() - 1; i >= 0; i--) { //Reverse traversal to prevent index confusion CellRangeAddress mergedRegion = sheet.getMergedRegion(i);
                // ... (Add logic here to determine whether the merged cell needs to be processed and the original data is read for merge or other operations) ...
            }
        }
    }
}</writecelldata>

2. Preserve styles: Also through custom WriteHandler , the original style of the merged cells is read and applied while writing data. The code example is as follows (resolution needs to be adjusted according to actual conditions):

 public class CellStyleHandler implements WriteHandler {
    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List <writecelldata> > cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
        if (cell != null && cell.getSheet().getWorkbook() instanceof XSSFWorkbook) {
            XSSFSheet sheet = (XSSFSheet) cell.getSheet();
            for (int i = sheet.getNumMergedRegions() - 1; i >= 0; i--) {
                CellRangeAddress mergedRegion = sheet.getMergedRegion(i);
                // ... (Add logic here to get the original style of the merged cells and apply) ...
            }
        }
    }
}</writecelldata>

Through the above custom WriteHandler , we can effectively avoid data overwrite and style loss problems that EasyExcel occurs when dealing with merged cells, ensuring data integrity and format consistency. Please note that // ... part of the code needs to write corresponding logic according to specific needs. It is recommended to refer to EasyExcel's official documentation and sample code for more in-depth learning and practice.

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