java实现页面excel导出功能

先用map集合从数据库获取数据，在获取导出的excel模板，循环map集合将数据，代码如下：
@Override
public void download(ShipDynamicForm dyform, HttpServletResponse response) {
if(StringUtils.isEmpty(dyform.getVdeptlist())){
dyform.setVdeptlist(null);
}
List<Map<String,Object>> list = shipmanagerRepositoryImpl.getShipDynamicExport2  (dyform);
response.setCharacterEncoding("utf-8");
response.setHeader("Content-type", "text/html;charset=UTF-8"); 
ResourceLoader loader = new DefaultResourceLoader();
        Resource file = loader.getResource("file:./config/temp/report/"+"shipdynamic"+".xlsx");
        try {
        response.setHeader("content-disposition", "attachment;filename="+ URLEncoder.encode("shipdynamic" + ".xlsx", "UTF-8"));
        ServletOutputStream  out=response.getOutputStream();
        XSSFWorkbook xwb = new XSSFWorkbook(file.getInputStream()); 
        XSSFSheet st = xwb.getSheetAt(0); 
        if(!CollectionUtils.isEmpty(list)){
        for(int i =0;i<list.size();i++){
        XSSFRow row = st.createRow(i+1);
        Map<String,Object>  m = list.get(i);
            row.createCell(0).setCellValue(m.get("userdeptname") == null ?"":m.get("userdeptname")+"");
            row.createCell(1).setCellValue(m.get("vshipname") == null ?"":m.get("vshipname")+"");
            row.createCell(2).setCellValue(m.get("vestvoyagenos") == null ?"":m.get("vestvoyagenos")+"");
            row.createCell(3).setCellValue(m.get("dynamictime") == null ?"":m.get("dynamictime")+"");
            row.createCell(5).setCellValue(m.get("vovportname") == null ?"":m.get("vovportname")+"");
            row.createCell(7).setCellValue(m.get("tasknonum") == null ?"":m.get("tasknonum")+"");
            row.createCell(8).setCellValue(m.get("swtasknonum")==null?"":m.get("swtasknonum")+"");
          row.createCell(9).setCellValue(m.get("invoicenonum")==null?0:((BigDecimal) m.get("invoicenonum")).intValue());
            row.createCell(10).setCellValue(m.get("gsftotalnonum")==null?"":m.get("gsftotalnonum")+"");
            row.createCell(11).setCellValue(m.get("vfuel")==null?"":m.get("vfuel")+"");
            ReportDataShipForm form = new ReportDataShipForm();
            if(StringUtils.isNotEmpty(m.get("vovvoyageid")==null?"":m.get("vovvoyageid")+"")){
            form.setVshipid(m.get("vovshipid").toString());
                form.setVvoyageid(m.get("vovvoyageid").toString());
            String vovvoyageid = m.get("vovvoyageid").toString();
            Response re = shipPlanDynamic(vovvoyageid);
            ShipDynamicForm VoyageStatusform = (ShipDynamicForm)re.getResultData();
            if(VoyageStatusform.getIshipstatus() != null && VoyageStatusform.getIshipstatus() == 0){
            row.createCell(4).setCellValue("在港");
            row.createCell(6).setCellValue(VoyageStatusform.getVshipplandynamic().replace("<br>", " "));
            }else if(VoyageStatusform.getIshipstatus() != null && VoyageStatusform.getIshipstatus() == 1){
            row.createCell(4).setCellValue("在航"); 
            row.createCell(6).setCellValue(VoyageStatusform.getVshipplandynamic().replace("<br>", " "));
            }
            }
        }
        xwb.write(out);
               out.flush();
               out.close();
        }
        } catch (Exception e) {
        e.printStackTrace();
        }
        
}