java poi 导出excel

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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();
}