SpringBoot生成Excel文件的实现示例

<dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi</artifactId>
     <version>5.2.3</version>
</dependency>
<dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi-ooxml</artifactId>
     <version>5.2.3</version>
</dependency>

public class ExcelGeneratorUtil {

    public static void generateExcel(List<Pitch> pitches) {
        try {
            //创建一个新的 Excel 工作簿对象，XSSFWorkbook 用于处理 .xlsx 格式的 Excel 文件
            Workbook workbook = new XSSFWorkbook();

            //创建一个文件输出流，用于将工作簿中的数据写入到名为 recommendedColleges.xlsx文件中
             FileOutputStream fileOut = new FileOutputStream("recommendedColleges.xlsx");
            
            //在工作簿中创建一个名为 Recommended Colleges 的工作表
            Sheet sheet = workbook.createSheet("Recommended Colleges");

            // 创建表头 选择第0行进行作为表头 并进行设置表头信息
            Row headerRow = sheet.createRow(0);
            Cell headerCell1 = headerRow.createCell(0);
            headerCell1.setCellValue("学校编号");
            Cell headerCell2 = headerRow.createCell(1);
            headerCell2.setCellValue("学校名称");
            Cell headerCell3 = headerRow.createCell(2);
            headerCell3.setCellValue("专业编号");
            Cell headerCell4 = headerRow.createCell(3);
            headerCell4.setCellValue("专业名称");
            Cell headerCell5 = headerRow.createCell(4);
            headerCell5.setCellValue("专业最低分");
            Cell headerCell6 = headerRow.createCell(5);
            headerCell6.setCellValue("专业最低位次");

            // 填充数据 初始化行号为 1
            int rowNum = 1;
            for (Pitch p : pitches) {
                //在工作表中创建新的行，并将行号加 1
                Row row = sheet.createRow(rowNum++);
                Cell cell1 = row.createCell(0);
                cell1.setCellValue(p.getSchoolCode());
                Cell cell2 = row.createCell(1);
                cell2.setCellValue(p.getSchoolName());
                Cell cell3 = row.createCell(2);
                cell3.setCellValue(p.getpCode());
                Cell cell4 = row.createCell(3);
                cell4.setCellValue(p.getpName());
                Cell cell5 = row.createCell(4);
                cell5.setCellValue(p.getLowestScore());
                Cell cell6 = row.createCell(5);
                cell6.setCellValue(p.getLowestRank());
            }
            
            //置每列的宽度，参数 1 是列索引，参数 2 是列宽，单位是 1/256 个字符宽度
            sheet.setColumnWidth(0, 15 * 256);
            sheet.setColumnWidth(1, 50 * 256);
            sheet.setColumnWidth(2, 15 * 256);
            sheet.setColumnWidth(3, 20 * 256);
            sheet.setColumnWidth(4, 15 * 256);
            sheet.setColumnWidth(5, 15 * 256);

            //将工作簿中的数据写入到文件输出流中，即保存到文件中
            workbook.write(fileOut);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}