easyexcel表头样式调整

easyexcel 提供了自定义表头样式的功能，包括设置背景色、字体、边框、对齐方式和换行，从而满足不同的展示需求。

如何自定义 EasyExcel 表头样式

EasyExcel 是一款 Java 工具库，它允许开发者轻松地读写 Excel 文件。它提供了一系列功能来自定义表头样式，以满足不同的展示需求。

1. 设置表头背景色

// 设置表头背景色为绿色
ExcelWriter writer = EasyExcel.write("test.xlsx").build();
Workbook workbook = writer.getWorkbook();
Sheet sheet = workbook.createSheet();
Row headRow = sheet.createRow(0);
Cell headCell = headRow.createCell(0);
headCell.setCellValue("表头");
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFillForegroundColor(IndexedColors.GREEN.getIndex());
headCell.setCellStyle(cellStyle);

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2. 设置表头字体

// 设置表头字体为加粗
ExcelWriter writer = EasyExcel.write("test.xlsx").build();
Workbook workbook = writer.getWorkbook();
Sheet sheet = workbook.createSheet();
Row headRow = sheet.createRow(0);
Cell headCell = headRow.createCell(0);
headCell.setCellValue("表头");
CellStyle cellStyle = workbook.createCellStyle();
Font font = workbook.createFont();
font.setBold(true);
cellStyle.setFont(font);
headCell.setCellStyle(cellStyle);

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3. 设置表头边框

// 设置表头边框为红色
ExcelWriter writer = EasyExcel.write("test.xlsx").build();
Workbook workbook = writer.getWorkbook();
Sheet sheet = workbook.createSheet();
Row headRow = sheet.createRow(0);
Cell headCell = headRow.createCell(0);
headCell.setCellValue("表头");
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setBorderBottom(BorderStyle.THIN);
cellStyle.setBottomBorderColor(IndexedColors.RED.getIndex());
headCell.setCellStyle(cellStyle);

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4. 设置表头对齐方式

// 设置表头对齐方式为居中
ExcelWriter writer = EasyExcel.write("test.xlsx").build();
Workbook workbook = writer.getWorkbook();
Sheet sheet = workbook.createSheet();
Row headRow = sheet.createRow(0);
Cell headCell = headRow.createCell(0);
headCell.setCellValue("表头");
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setAlignment(HorizontalAlignment.CENTER);
headCell.setCellStyle(cellStyle);

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5. 设置表头换行

// 设置表头换行
ExcelWriter writer = EasyExcel.write("test.xlsx").build();
Workbook workbook = writer.getWorkbook();
Sheet sheet = workbook.createSheet();
Row headRow = sheet.createRow(0);
Cell headCell = headRow.createCell(0);
headCell.setCellValue("表\n头");
headCell.setCellStyle(CellStyle.DEFAULT_HEAD);

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