EasyExcel 导出 自定义总标题换行和每一列小标题 - 详细教程

{"title":"EasyExcel 导出 自定义总标题换行和每一列小标题 - 详细教程", "description":"本教程详细介绍了如何使用 EasyExcel 自定义导出表格的总标题换行和每一列小标题，并提供了代码示例和详细说明。", "keywords":"EasyExcel, 导出, 自定义总标题, 换行, 小标题, 样式, StyleStrategy, 代码示例, 教程", "content":"要实现自定义总标题有换行和每一列的小标题，可以使用easyExcel提供的StyleStrategy接口来实现。\n\n首先，创建一个继承自DefaultStyleStrategy的自定义样式策略类，例如CustomStyleStrategy：\n\njava\npublic class CustomStyleStrategy extends DefaultStyleStrategy {\n @Override\n public TableStyle getTableStyle(Integer sheetNo, Boolean isHead, List<List<String>> head, List<List<String>> content, ExcelWriter excelWriter) {\n TableStyle tableStyle = super.getTableStyle(sheetNo, isHead, head, content, excelWriter);\n \n // 设置总标题样式（换行）\n Font totalTitleFont = excelWriter.createFont();\n totalTitleFont.setFontHeightInPoints((short) 16);\n totalTitleFont.setBold(true);\n totalTitleFont.setColor(Font.COLOR_NORMAL);\n CellStyle totalTitleCellStyle = excelWriter.getWorkbook().createCellStyle();\n totalTitleCellStyle.setFont(totalTitleFont);\n totalTitleCellStyle.setAlignment(HorizontalAlignment.CENTER);\n totalTitleCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);\n totalTitleCellStyle.setWrapText(true);\n tableStyle.setTableHeadTextStyle(totalTitleCellStyle);\n \n // 设置小标题样式\n Font subTitleFont = excelWriter.createFont();\n subTitleFont.setFontHeightInPoints((short) 12);\n subTitleFont.setBold(true);\n subTitleFont.setColor(Font.COLOR_NORMAL);\n CellStyle subTitleCellStyle = excelWriter.getWorkbook().createCellStyle();\n subTitleCellStyle.setFont(subTitleFont);\n subTitleCellStyle.setAlignment(HorizontalAlignment.CENTER);\n subTitleCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);\n tableStyle.setTableHeadTextStyle(subTitleCellStyle);\n \n return tableStyle;\n }\n}\n\n\n然后，在导出Excel时，使用自定义的样式策略类：\n\njava\npublic void exportExcel() {\n // 创建ExcelWriter对象\n ExcelWriter excelWriter = EasyExcel.write("output.xlsx").build();\n \n // 设置自定义样式策略\n CustomStyleStrategy styleStrategy = new CustomStyleStrategy();\n excelWriter.setTableStyleStrategy(styleStrategy);\n \n // 写入数据\n WriteSheet writeSheet = EasyExcel.writerSheet("Sheet1").build();\n excelWriter.write(dataList, writeSheet);\n \n // 关闭ExcelWriter对象\n excelWriter.finish();\n}\n\n\n以上代码中，CustomStyleStrategy类重写了getTableStyle方法，可以根据isHead参数判断当前是总标题还是小标题，然后设置不同的样式。在getTableStyle方法中，使用EasyExcel提供的API创建Font和CellStyle，并设置相关样式属性，最后将样式设置到TableStyle中，返回给EasyExcel处理。\n\n这样，就可以实现自定义总标题有换行和每一列的小标题的效果了。