java 类 写入excel

public class ExcelData implements Serializable {

    private static final long serialVersionUID = 4444017239100620999L;

    // 表头
    private List titles;

    // 数据
    private List> rows;

    // 页签名称
    private String name;

    public List getTitles() {
        return titles;
    }

    public void setTitles(List titles) {
        this.titles = titles;
    }

    public List> getRows() {
        return rows;
    }

    public void setRows(List> 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, List datas) 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(datas, response.getOutputStream());
    }

    public static void exportExcel(List datas, OutputStream out) throws Exception {

        XSSFWorkbook wb = new XSSFWorkbook();
        try {
            for (ExcelData data : datas) {
                String sheetName = data.getName();
                if (null == sheetName) {
                    sheetName = "Sheet";
                }
                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 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(HorizontalAlignment.CENTER);
        titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
        titleStyle.setFillPattern(FillPatternType.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;
    }

    public static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List> 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(HorizontalAlignment.CENTER);
        dataStyle.setAlignment(HorizontalAlignment.LEFT);
        dataStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        dataStyle.setFont(dataFont);
        setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        for (List