1、需要的jar包（放在lib下）
poi-3.9.jar
poi-ooxml-3.9.jar
poi-ooxml-schemas-3.9.jar
2、创建下载
~~~
//创建HSSFWorkbook对象：其实它就最终生成Excel文件对应的对象
HSSFWorkbook workbook = new HSSFWorkbook();
//通过HSSFWorkbook对象创建HSSFSheet对象
HSSFSheet createSheet = workbook.createSheet("sheet名称");
HSSFDataFormat createDataFormat = workbook.createDataFormat();
HSSFCellStyle dateHSSFCellStyle = workbook.createCellStyle();
dateHSSFCellStyle.setDataFormat(createDataFormat.getFormat("yyyy年MM月dd日 HH:mm:ss"));
HSSFCellStyle floatHSSFCellStyle = workbook.createCellStyle();
floatHSSFCellStyle.setDataFormat(createDataFormat.getFormat("#,#.000"));
HSSFCellStyle richTextHSSFCellStyle = workbook.createCellStyle();
richTextHSSFCellStyle.setWrapText(true); //自动折行
HSSFRow row = createSheet.createRow(0);//自定义第一行内容
row.createCell(0).setCellValue("姓名");
row.createCell(1).setCellValue("身份证号码");
row.createCell(2).setCellValue("联系电话");
//第二行内容（批量数据可以自己封装list等，放入数据即可）
HSSFRow row1 = createSheet.createRow(1);
row1.createCell(0).setCellValue("内容1");
row1.createCell(1).setCellValue("内容2");
row1.createCell(2).setCellValue("内容3");
OutputStream output = response.getOutputStream();
response.reset();
String fileName = "excel名称";
response.setContentType("application/vnd.ms-excle;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="+ new String(fileName.getBytes(),"iso-8859-1")+".xls");
workbook.write(output);
output.close();
~~~
3、jar包下载地址:
https://search.maven.org/search?q=g:org.apache.poi%20AND%20a:poi