本篇內容介紹了“Java怎么使用EasyExcel進行單元格合并”的有關知識，在實際案例的操作過程中，不少人都會遇到這樣的困境，接下來就讓小編帶領大家學習一下如何處理這些情況吧！希望大家仔細閱讀，能夠學有所成！
簡介：報銷單導出要根據指定的excel模板去自動替換對應，然后重新生成一份新的excel。在給定的excel模板中，有部分字段進行了單元格合并，如下所示。
由于一張報銷單可能存在多條報銷內容，可以看到，當超過模板中預先給定的一條時，則會自動換行，但換行時并不會自動依照模板中的樣式進行單元格合并，如下所示。
首先可以直觀的看到excel進行數據插入并自動換行的時候，換行的數據并沒有按照上一行的樣式進行自動合并。
于是便想著用代碼把這幾列手動合并，然后再加上邊框樣式就可以解決了。
4.解決方案：
需要注意的是，按照以上的思路，直接進行單元格合并，然后加上邊框并不能直接解決問題。
需要將后邊空的每一個單元格先創建出來，然后將其一塊合并才可以解決，創建單元格代碼在下方CustomCellWriteHandler類中說明。
這也算是耗費一整天時間踩的坑。。。
public static void outExcelBalance(String modelFile, String newFile, Map<String, Object> map, List<FillDataExpense> fillData, HttpServletResponse response, String fileName){
//定義model模板中默認的行數
int firstRow = 7; //excel中表示第八行，即模板中默認的一條
int lastRow = 7;
InputStream is = null;
File file = new File(modelFile);
File file1 = new File(newFile);
//String file1Name = file1.getName();
BufferedInputStream bis = null;
try {
if (!file.exists()) {
copyFileUsingJava7Files(file, file1);
}
//TODO 單元格樣式
Set<Integer> rowsBorderSet= new HashSet<>();
CustomCellWriteHandler customCellWriteHandler = null;
//TODO 單元格合并
List<CellRangeAddress> cellRangeAddresss = new ArrayList<>();
if (ListUtils.isNotNull(fillData)){
if (fillData.size() > 1){
//合并每條報銷單的第3-10列
for (int i = 1; i < fillData.size(); i++) {
firstRow++;
lastRow++;
cellRangeAddresss.add(new CellRangeAddress(firstRow, lastRow, 2, 9));
cellRangeAddresss.add(new CellRangeAddress(firstRow, lastRow, 10, 11));
rowsBorderSet.add(firstRow);
}
}
}
customCellWriteHandler = new CustomCellWriteHandler(rowsBorderSet);
MyMergeStrategy myMergeStrategy = new MyMergeStrategy(cellRangeAddresss);
ExcelWriter excelWriter = EasyExcel.write(newFile)
//注冊單元格式
.registerWriteHandler(customCellWriteHandler)
//注冊合并策略
.registerWriteHandler(myMergeStrategy)
.withTemplate(modelFile).build();
WriteSheet writeSheet = EasyExcel.writerSheet().build();
FillConfig fillConfig = FillConfig.builder().forceNewRow(Boolean.TRUE).build();
if (!ListUtil.listIsEmpty(fillData)){
excelWriter.fill(fillData, fillConfig, writeSheet);
//excelWriter.fill(fillData, fillConfig, writeSheet);
}
excelWriter.fill(map, writeSheet);
excelWriter.finish();
response.setHeader("content-type", "text/plain");
response.setHeader("content-type", "application/x-msdownload;");
response.setContentType("text/plain; charset=utf-8");
response.setHeader("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("utf-8"),"ISO8859-1"));
byte[] buff = new byte[1024];
OutputStream os = null;
os = response.getOutputStream();
bis = new BufferedInputStream(new FileInputStream(file1));
int i = bis.read(buff);
while (i != -1) {
os.write(buff, 0, buff.length);
os.flush();
i = bis.read(buff);
}
}
catch (Exception e){
LOGGER.error(e.getMessage());
}
finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// 刪除生成文件
/*if (file1.exists()) {
file1.delete();
}*/
}
}單元格合并MyMergeStrategy類代碼：
public class MyMergeStrategy extends AbstractMergeStrategy {
//合并坐標集合
private List<CellRangeAddress> cellRangeAddresss;
//構造
public MyMergeStrategy(List<CellRangeAddress> cellRangeAddresss) {
this.cellRangeAddresss = cellRangeAddresss;
}
@Override
protected void merge(Sheet sheet, Cell cell, Head head, Integer integer) {
if (ListUtils.isNotNull(cellRangeAddresss)) {
if (cell.getRowIndex() == 7 ) {
for (CellRangeAddress item : cellRangeAddresss) {
sheet.addMergedRegionUnsafe(item);
}
}
}
}
}單元格樣式CustomCellWriteHandler類代碼：
public class CustomCellWriteHandler implements CellWriteHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(CustomCellWriteHandler.class);
//標黃行寬集合
private Set<Integer> rowIndexs;
//構造
public CustomCellWriteHandler(Set<Integer> rowIndexs) {
this.rowIndexs = rowIndexs;
}
public CustomCellWriteHandler() {
}
@Override
public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
LOGGER.info("beforeCellCreate~~~~");
}
@Override
public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
LOGGER.info("afterCellCreate~~~~");
}
@Override
public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer integer, Boolean aBoolean) {
}
@Override
public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
//獲取工作簿
// HSSFWorkbook wb = new HSSFWorkbook();
// //獲取sheet
// HSSFSheet sheet = wb.createSheet();
// HSSFRow row = sheet.createRow();
// HSSFCellStyle style = wb.createCellStyle();
// 這里可以對cell進行任何操作
if (CollectionUtils.isNotEmpty(rowIndexs)) {
Workbook workbook = writeSheetHolder.getSheet().getWorkbook();
CellStyle cellStyle = workbook.createCellStyle();
Sheet sheet = writeSheetHolder.getSheet();
cellStyle.setAlignment(new HSSFWorkbook().createCellStyle().getAlignment());
cellStyle.setBorderBottom(BorderStyle.THIN); //下邊框
cellStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
cellStyle.setBorderLeft(BorderStyle.THIN);//左邊框
cellStyle.setBorderTop(BorderStyle.THIN);//上邊框
cellStyle.setBorderRight(BorderStyle.THIN);//右邊框
cellStyle.setWrapText(true);//自動換行
//字體
// Font cellFont = workbook.createFont();
// cellFont.setBold(true);
// cellStyle.setFont(cellFont);
// //標黃,要一起設置
// cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND); //設置前景填充樣式
// cellStyle.setFillForegroundColor(IndexedColors.YELLOW.getIndex());//前景填充色
if (rowIndexs.contains(cell.getRowIndex())) {
Row row = null;
//循環創建空白單元格
for (int i = 0; i < rowIndexs.size(); i++) {
for (Integer rowIndex : rowIndexs){
//創建4-10列的空白格
row = sheet.getRow(rowIndex.intValue());
if (row == null){
row = sheet.createRow(rowIndex.intValue());
}
for (int j = 3; j <= 9; j++) {
//獲取8行的cell列
cell = row.createCell(j);
cell.setCellStyle(cellStyle);
cell.setCellValue(" ");
LOGGER.info("第{}行，第{}列創建空白格。", cell.getRowIndex(), j);
}
//創建12列的紅白格
cell = row.createCell(11);
cell.setCellStyle(cellStyle);
cell.setCellValue(" ");
LOGGER.info("第{}行，第11列創建空白格。", cell.getRowIndex());
//創建21列的空白格
cell = row.createCell(21);
cell.setCellStyle(cellStyle);
cell.setCellValue(" ");
LOGGER.info("第{}行，第21列創建空白格。", cell.getRowIndex());
}
}
}
}
}
}核心步驟：
1. //創建單元格樣式 CustomCellWriteHandler customCellWriteHandler = new CustomCellWriteHandler(參數按需給定); 2. //單元格進行合并 List<CellRangeAddress> cellRangeAddresss = new ArrayList<>(); //例如：從firstRow行到lastRow行的2列到9列合并 cellRangeAddresss.add(new CellRangeAddress(firstRow, lastRow, 2, 9)); cellRangeAddresss.add(new CellRangeAddress(firstRow, lastRow, 10, 11)); MyMergeStrategy myMergeStrategy = new MyMergeStrategy(cellRangeAddresss); 3. //注冊以上兩種策略 ExcelWriter excelWriter = EasyExcel.write(newFile) //注冊單元格式 .registerWriteHandler(customCellWriteHandler) //注冊合并策略 .registerWriteHandler(myMergeStrategy) .withTemplate(modelFile).build();
說明：剛開始修復的時候，并沒有想過后邊每個空的單元格需要先創建出來，才可以進行合并。一直以為是工具類的問題，后來不斷的翻閱解決方案，看到有說需要先進行創建空白單元格，然后再進行合并，最終完美解決了。
關于代碼部分，由于是業務代碼，中間夾雜了許多不需要的。
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