Java导出Excel文件的方法

ExcelData data = new ExcelData();
data.setName("页签名称");

// 标题
List<String> titles = new ArrayList();
titles.add("第一列");
titles.add("第二列");
titles.add("第三列");
data.setTitles(titles);

// 内容
List<List<Object>> rows = new ArrayList();
for(int i=0; i<10; i++){
    List<Object> row = new ArrayList();
    row.add(第+"i"+行第一列);
    row.add(第+"i"+行第二列);
    row.add(第+"i"+行第三列);
    rows.add(row);
}
data.setRows(rows);

XSSFWorkbook wb = ExportExcelUtils.exportExcel(data);
ByteArrayOutputStream outByteStream = new ByteArrayOutputStream();
wb.write(outByteStream);
wb.close();

HttpHeaders headers = new HttpHeaders();
headers.add("Content-Type", "application/vnd.ms-excel");
headers.add("Connection", "close");
headers.add("file", "type");
headers.add("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO-8859-1"));

return new ResponseEntity<byte[]>(outByteStream.toByteArray(), headers, HttpStatus.CREATED);

response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setCharacterEncoding("UTF-8");
response.setHeader("file", "type");
response.setHeader("Connection", "close");
response.setHeader("Content-disposition", "attachment;filename=" + ExcelUtil.toUtf8String("文件名"));

String filePath = "/docs/file.xlsx";
InputStream inputStream = new ClassPathResource(filePath).getInputStream();
XSSFWorkbook xssfWorkbook = new XSSFWorkbook(inputStream);

// sheet
XSSFSheet sheetAt = xssfWorkbook.getSheetAt(0);
sheetAt.setColumnWidth(0, 15000);

// 单元格格式
XSSFCellStyle cellStyle = xssfWorkbook.createCellStyle();
cellStyle.setAlignment(HorizontalAlignment.CENTER);
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
cellStyle.setBorderTop(BorderStyle.THIN);
cellStyle.setBorderRight(BorderStyle.THIN);
cellStyle.setBorderBottom(BorderStyle.THIN);
cellStyle.setBorderLeft(BorderStyle.THIN);

// 标题
writeValue(sheetAt, cellStyle, 0, 0, "第一列");
writeValue(sheetAt, cellStyle, 0, 0, "第二列");
writeValue(sheetAt, cellStyle, 0, 0, "第三列");

// 内容
for(int i=1; i=10; i++){
    writeValue(sheetAt, cellStyle, i, 0, "第"+i+"行第一列");
    writeValue(sheetAt, cellStyle, i, 1, "第"+i+"行第二列");
    writeValue(sheetAt, cellStyle, i, 2, "第"+i+"行第三列");
}

xssfWorkbook.write(response.getOutputStream());

if (null != xssfWorkbook) {
    xssfWorkbook.close();
}