poi导出excel改变标题颜色

在excelutil类里面添加

public class ExcelUtil {
    public static Workbook fillExcelData(ResultSet rs, Workbook wb, String[] headers) throws Exception {
        int rowIndex = 0; //定义行的初始值
        Sheet sheet = wb.createSheet(); //创建sheet页
        Row row = sheet.createRow(rowIndex++); //行数自增+1
        //改变字体颜色
        wb.createCellStyle();
        CellStyle style = wb.createCellStyle();
        HSSFFont font=(HSSFFont) wb.createFont();
        font.setColor(HSSFColor.RED.index);
        style.setFont(font);
        //将头信息填进单元格
        for (int i = 0; i < headers.length; i++) {
            Cell cell = row.createCell(i);
            cell.setCellValue(headers[i]);
            cell.setCellStyle(style);//将字体样式给单元格

        }


        while (rs.next()) {
            row = sheet.createRow(rowIndex++); //增加行数
            for (int i = 0; i < headers.length; i++) { // 添加内容
                row.createCell(i).setCellValue(rs.getObject(i + 1).toString());
            }
        }
        return wb;
    }
   
}