spring boot poi 导出Excel

public class ExcelData implements Serializable {

    private static final long serialVersionUID = 4444017239100620999L;

    // 表头

    private List<String> titles;

    // 数据

    private List<List<Object>> rows;

    // 页签名称

    private String name;

    public List<String> getTitles() {

        return titles;

    }

    public void setTitles(List<String> titles) {

        this.titles = titles;

    }

    public List<List<Object>> getRows() {

        return rows;

    }

    public void setRows(List<List<Object>> rows) {

        this.rows = rows;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

}

public class ExportExcelUtils {

    public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {

        // 告诉浏览器用什么软件可以打开此文件

        response.setHeader("content-Type", "application/vnd.ms-excel");

        // 下载文件的默认名称

        response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "utf-8"));

        exportExcel(data, response.getOutputStream());

    }

    public static void exportExcel(ExcelData data, OutputStream out) throws Exception {

        XSSFWorkbook wb = new XSSFWorkbook();

        try {

            String sheetName = data.getName();

            if (null == sheetName) {

                sheetName = "Sheet1";

            }

            XSSFSheet sheet = wb.createSheet(sheetName);

            writeExcel(wb, sheet, data);

            wb.write(out);

        } finally {

            wb.close();

        }

    }

    private static void writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {

        int rowIndex = 0;

        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());

        writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);

        autoSizeColumns(sheet, data.getTitles().size() + 1);

    }

    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {

        int rowIndex = 0;

        int colIndex = 0;

        Font titleFont = wb.createFont();

        titleFont.setFontName("simsun");

        titleFont.setBold(true);

        // titleFont.setFontHeightInPoints((short) 14);

        titleFont.setColor(IndexedColors.BLACK.index);

        XSSFCellStyle titleStyle = wb.createCellStyle();

        titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);

        titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);

        titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));

        titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);

        titleStyle.setFont(titleFont);

        setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        Row titleRow = sheet.createRow(rowIndex);

        // titleRow.setHeightInPoints(25);

        colIndex = 0;

        for (String field : titles) {

            Cell cell = titleRow.createCell(colIndex);

            cell.setCellValue(field);

            cell.setCellStyle(titleStyle);

            colIndex++;

        }

        rowIndex++;

        return rowIndex;

    }

    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {

        int colIndex = 0;

        Font dataFont = wb.createFont();

        dataFont.setFontName("simsun");

        // dataFont.setFontHeightInPoints((short) 14);

        dataFont.setColor(IndexedColors.BLACK.index);

        XSSFCellStyle dataStyle = wb.createCellStyle();

        dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);

        dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);

        dataStyle.setFont(dataFont);

        setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        for (List<Object> rowData : rows) {

            Row dataRow = sheet.createRow(rowIndex);

            // dataRow.setHeightInPoints(25);

            colIndex = 0;

            for (Object cellData : rowData) {

                Cell cell = dataRow.createCell(colIndex);

                if (cellData != null) {

                    cell.setCellValue(cellData.toString());

                } else {

                    cell.setCellValue("");

                }

                cell.setCellStyle(dataStyle);

                colIndex++;

            }

            rowIndex++;

        }

        return rowIndex;

    }

    private static void autoSizeColumns(Sheet sheet, int columnNumber) {

        for (int i = 0; i < columnNumber; i++) {

            int orgWidth = sheet.getColumnWidth(i);

            sheet.autoSizeColumn(i, true);

            int newWidth = (int) (sheet.getColumnWidth(i) + 100);

            if (newWidth > orgWidth) {

                sheet.setColumnWidth(i, newWidth);

            } else {

                sheet.setColumnWidth(i, orgWidth);

            }

        }

    }

    private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {

        style.setBorderTop(border);

        style.setBorderLeft(border);

        style.setBorderRight(border);

        style.setBorderBottom(border);

        style.setBorderColor(BorderSide.TOP, color);

        style.setBorderColor(BorderSide.LEFT, color);

        style.setBorderColor(BorderSide.RIGHT, color);

        style.setBorderColor(BorderSide.BOTTOM, color);

    }

}

@RestController

public class ExcelController {

    @RequestMapping(value = "/excel", method = RequestMethod.GET)

    public void excel(HttpServletResponse response) throws Exception {

        ExcelData data = new ExcelData();

        data.setName("hello");

        List<String> titles = new ArrayList();

        titles.add("a1");

        titles.add("a2");

        titles.add("a3");

        data.setTitles(titles);

        List<List<Object>> rows = new ArrayList();

        List<Object> row = new ArrayList();

        row.add("11111111111");

        row.add("22222222222");

        row.add("3333333333");

        rows.add(row);

        data.setRows(rows);

        //生成本地

        /*File f = new File("c:/test.xlsx");

        FileOutputStream out = new FileOutputStream(f);

        ExportExcelUtils.exportExcel(data, out);

        out.close();*/

        ExportExcelUtils.exportExcel(response,"hello.xlsx",data);

    }

}