poi根据模板导出excel

1.引入poi包

            org.apache.poi
            poi
            3.15

2.获取模板

String filePath = request.getSession().getServletContext().getRealPath("") + "xxx.xls";

HSSFWorkbook workbook = null;
try {
      //获取模板
      File file = new File(filePath);
      FileInputStream input = new FileInputStream(file);
      workbook = new HSSFWorkbook(input);
} catch (IOException e) {
      e.printStackTrace();
}

HSSFSheet sheet = workbook.getSheetAt(0);

HSSFRow row = null;
HSSFCell cell = null;

3.填充数据

List datas = service.getDatas();

int cellIndex = 0;

//获取最后一行

int curRowIndex = sheet.getLastRowNum();

row = sheet.createRow(curRowIndex+1):

cell = row.getCell(cellIndex++):

cell.setCellValue("第一格数据");

cell = row.getCell(cellIndex++):

cell.setCellValue("第二格数据");

cell = row.getCell(cellIndex++):

cell.setCellValue("第三格数据");

4.导出

导出有两种方式，第一是指定导出位置，第二是弹出下载

指定导出位置的导出方式：

try{

    FileOutputStream output = new FileOutputStream(new File("D:\\测试.xls"));

    workbook.write(ouput);

    output.close();

}catch(IOException e){

    e.printStackTrace();

}

弹出下载方式：

try {
      String fileName = "测试.xls";
      response.reset();
      response.setContentType("application/msexcel");
      response.setCharacterEncoding("UTF-8");
      response.setHeader("Content-Disposition","attchment;filename="+new String((fileName.getBytes()),"iso-8859-1"));
      OutputStream out = response.getOutputStream();
      workbook.write(out);
      out.flush();
      out.close();
 } catch (IOException e) {
      e.printStackTrace();
 }

5.前端请求

window.location.href = "xxxAction.do?action=xxx";

弹出下载不支持ajax请求，因为ajax请求的response是二进制流。