Spring Boot利用poi导出Excel

至于poi的用法就不多说了，网上多得很，但是发现spring boot结合poi的就不多了，而且大多也有各种各样的问题。

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 = ;

        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
        writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
        autoSizeColumns(sheet, data.getTitles().size() + );

    }

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

        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(, , )));
        titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
        titleStyle.setFont(titleFont);
        setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(, , )));

        Row titleRow = sheet.createRow(rowIndex);
        // titleRow.setHeightInPoints(25);
        colIndex = ;

        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 = ;

        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(, , )));

        for (List<Object> rowData : rows) {
            Row dataRow = sheet.createRow(rowIndex);
            // dataRow.setHeightInPoints(25);
            colIndex = ;

            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 = ; i < columnNumber; i++) {
            int orgWidth = sheet.getColumnWidth(i);
            sheet.autoSizeColumn(i, true);
            int newWidth = (int) (sheet.getColumnWidth(i) + );
            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("");
        row.add("");
        row.add("");
        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);
    }
}

功能比较简单，没有做太多扩展，想自己扩展的可以查看poi的官方文档自行扩展，简单的很。

如果用POST提交，前端不能用Ajax，只能用form表单提交，参数接受Controller那一块用@ModelAttribute,@RequestBody是专门用于接受Json数据的

项目地址：https://github.com/xiaopotian1990/SpringBootExcel