The effect after merging is as follows:
merging strategy code:
public class CustomMergeStrategy extends AbstractMergeStrategy {
/**
* 分组，每几行合并一次
*/
private List<List<Integer>> mergeColDataGroupCountList;
/**
* 目标合并列index
*/
private List<Integer> targetColumnIndex;
/**
* 需要开始合并单元格的首行index
*/
private Integer rowIndex;
/**
* mergeColDataList为待合并目标列的值
*/
public CustomMergeStrategy(List<List<String>> mergeColDataList, List<Integer> targetColumnIndex) {
this.mergeColDataGroupCountList = getGroupCountList(mergeColDataList);
this.targetColumnIndex = targetColumnIndex;
}
@Override
protected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {
if (null == rowIndex) {
rowIndex = cell.getRowIndex();
}
// 仅从首行以及目标列的单元格开始合并，忽略其他
if (cell.getRowIndex() == rowIndex && targetColumnIndex.contains(cell.getColumnIndex())) {
//找到对应的需要合并的列
AtomicInteger i = new AtomicInteger(0);
Optional<Integer> first = targetColumnIndex.stream().filter(col -> {
i.getAndIncrement();
return col == cell.getColumnIndex();
}).findFirst();
mergeGroupColumn(sheet, first.get());
}
}
private void mergeGroupColumn(Sheet sheet, Integer index) {
int rowCount = rowIndex;
for (Integer count : mergeColDataGroupCountList.get(index)) {
if (count == 1) {
rowCount += count;
continue;
}
// 合并单元格
CellRangeAddress cellRangeAddress = new CellRangeAddress(rowCount, rowCount + count - 1,
targetColumnIndex.get(index), targetColumnIndex.get(index));
sheet.addMergedRegionUnsafe(cellRangeAddress);
rowCount += count;
}
}
/**
* 该方法将目标列根据值是否相同连续可合并，存储可合并的行数
*/
private List<List<Integer>> getGroupCountList(List<List<String>> exportDataList) {
if (CollUtil.isEmpty(exportDataList)) {
return new ArrayList<>();
}
List<List<Integer>> groupCountListList = new ArrayList<>();
exportDataList.forEach(dataList->{
List<Integer> groupCountList = new ArrayList<>();
int count = 1;
for (int i = 1; i < dataList.size(); i++) {
if (dataList.get(i).equals(dataList.get(i - 1))) {
count++;
} else {
groupCountList.add(count);
count = 1;
}
}
// 处理完最后一条后
groupCountList.add(count);
groupCountListList.add(groupCountList);
});
return groupCountListList;
}
}
use:
//序号列和运营公司列需要合并单元格
List<List<String>> mergeColDataList = Stream.of(data.stream().map(BridgeTypeLengthExcel::getNum).collect(Collectors.toList()),
data.stream().map(BridgeTypeLengthExcel::getOperateDeptName).collect(Collectors.toList())).collect(Collectors.toList());
//第一列(index=0)和第二列(index=1)
List<Integer> mergeColIndexList = Stream.of(0, 1).collect(Collectors.toList());
//内部finish的时候会自动关闭流
EasyExcel.write(response.getOutputStream(), BridgeTypeLengthExcel.class)
.registerWriteHandler(
new CustomMergeStrategy(
mergeColDataList, mergeColIndexList
)
)
.sheet("统计")
.doWrite(data);
The main body code comes from the network, which can be modified according to your own business, and supports the merging of multiple columns of the same data.