java poi 导出excel

poi的jar下载地址：http://poi.apache.org/

下载后会有很多jar，但是如果只是简单的excel报表的话，导入一个poi-版本号-日期.jar就可以了。

导出代码：

PRivate void outputExcel(String queryDate, String[] headers,            List<List<String>> diaochas, HttpServletRequest request,            HttpServletResponse response) throws IOException {        HSSFWorkbook workbook = new HSSFWorkbook();        //createSheet(excel工作表名)        HSSFSheet sheet = workbook.createSheet(queryDate);        //下面是设置excel表中标题的样式        HSSFCellStyle title_style = workbook.createCellStyle();        title_style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);        title_style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);        title_style.setBorderBottom(HSSFCellStyle.BORDER_THIN);        title_style.setBorderLeft(HSSFCellStyle.BORDER_THIN);        title_style.setBorderRight(HSSFCellStyle.BORDER_THIN);        title_style.setBorderTop(HSSFCellStyle.BORDER_THIN);        title_style.setAlignment(HSSFCellStyle.ALIGN_CENTER);        HSSFFont title_font = workbook.createFont();        title_font.setColor(HSSFColor.VIOLET.index);        title_font.setFontHeightInPoints((short) 12);        title_font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);        title_style.setFont(title_font);        //内容的样式        HSSFCellStyle content_style = workbook.createCellStyle();        content_style.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);        content_style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);        content_style.setBorderBottom(HSSFCellStyle.BORDER_THIN);        content_style.setBorderLeft(HSSFCellStyle.BORDER_THIN);        content_style.setBorderRight(HSSFCellStyle.BORDER_THIN);        content_style.setBorderTop(HSSFCellStyle.BORDER_THIN);        content_style.setAlignment(HSSFCellStyle.ALIGN_CENTER);        content_style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);        HSSFFont content_font = workbook.createFont();        content_font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);        content_style.setFont(content_font);        //填充标题内容        HSSFRow row = sheet.createRow(0);        for (int i = 0; i < headers.length; i++) {            //设置标题的宽度自适应            sheet.setColumnWidth(i, headers[i].getBytes().length * 2 * 256);            HSSFCell cell = row.createCell(i);            cell.setCellStyle(title_style);            HSSFRichTextString text = new HSSFRichTextString(headers[i]);            cell.setCellValue(text);        }        //填充内容 囧。。。偷懒没有建立对象，直接用List存放的数据。        for (int i = 0; i < diaochas.size(); i++) {            row = sheet.createRow(i + 1);            List<String> diaocha = diaochas.get(i);            for (int j = 0; j < diaocha.size(); j++) {                HSSFCell cell = row.createCell(j);                cell.setCellStyle(content_style);                HSSFRichTextString richString = new HSSFRichTextString(                        diaocha.get(j));                cell.setCellValue(richString);            }        }        //这里调用reset()因为我在别的代码中调用了response.getWriter();        response.reset();        response.setContentType("application/vnd.ms-excel");        response.setHeader("Content-disposition", "attachment;filename="                + queryDate + ".xls");        OutputStream ouputStream = response.getOutputStream();        workbook.write(ouputStream);        ouputStream.flush();        ouputStream.close();    }

嗯 附加一个MySQL函数获取年月的

date_format(formatdate,'%Y-%m')

最后提示一点是，在请求导出的时候，不能用Ajax请求，会没有反映的。