java 导出数据到excel

controller

/**
     * 
     * @Description (导出申请单)
     * @author feizhou
     * @Date 2018年6月21日下午4:33:02  
     * @version 1.0.0
     * @param resquest
     * @param response
     */
    @RequestMapping(value = "/PushLogController/exportDateByModel.do")
    public void exportDateByModel(HttpServletRequest resquest,HttpServletResponse  response,String[] applicationNOs) {
//      String jsonStr=null;
        Map<String, Object> paramMap = RequestUtil.getUrlParam(resquest);
        paramMap.put("applicationNOs", applicationNOs);
        paramMap.put("startRow",1);
        try {
            pushLogService.exportDateByModel(paramMap,resquest,response);
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }

service

@Override
    public void exportDateByModel(Map<String, Object> paramMap,HttpServletRequest request,HttpServletResponse response) {

        String fileName=(String) paramMap.get("fileName");
        Integer startRow=(Integer) paramMap.get("startRow");
        //模板路径
        String modelURL=Constans.applicationModel;

        List<List<String >>listData=null;
        listData=bulidListData(paramMap);
        if(StringUtil.isEmpty(listData)){
            throw new MyException("所选的申请单没有还款计划");
        }
          if(StringUtil.isEmpty(fileName)){
            fileName="model.xlsx";
           }
        ExcelUtil.objListToExcel(listData, response, request, fileName, startRow,modelURL);
    }

构建数据

    //构建导出需要的数据
    private List<List<String>> bulidListData(Map<String, Object> paramMap) {
        // TODO Auto-generated method stub
        List<List<String>> listData=new ArrayList<List<String>>();

        //获取数据
         List<Application> applications = applicationDao.selectList(paramMap);

            for (Application application : applications) {
                List<String> data=new ArrayList<String>();
                data.add(application.getApplicationNO());
                data.add(application.getCustomerID() );
                data.add(application.getGys_borrowsq());
                data.add(application.getUser_phone() );
                listData.add(data);
            }
         return listData;
    }

导出的核心代码

 /**
     * @Description (通过excel模板，导出excel数据)
     * @author feizhou
     * @Date 2017年12月14日 下午3:00:52
     * @version 1.0.0
     * @param listData
     * @param response
     * @param fileName
     */
    public static void objListToExcel(List<List<String>> listData, HttpServletResponse response,
            HttpServletRequest request, String fileName,Integer startRow,String modelURL) {

        // 获取项目发布的路径
        String projectPath = request.getSession().getServletContext().getRealPath("");
        // 模板文件路径
        String modelPath = projectPath + modelURL;
        // Excel2007版本的Excel文件需要使用XSSFWorkbook来读取，如下：
        XSSFWorkbook wb = getWorkBookGivenFileHandle(modelPath);
        // 获得当前sheet工作表//默认第一个个
        XSSFSheet sheet = wb.getSheetAt(0);
        if (StringUtil.isNotEmpty(wb)) {
            try {
                XSSFRow row = null;
                // 设置内容
                //获取开始行之后的第一行的所有单元格样式
                row = sheet.getRow(startRow);
                XSSFCellStyle rowStyle = row.getRowStyle();
                short height = row.getHeight();
//                boolean zeroHeight = row.getZeroHeight();
//              row.get
                int m = listData.get(0).size();
                List<XSSFCellStyle> listCellStyle=new ArrayList<XSSFCellStyle>();
                for (int j = 0; j < m; j++) {
                    XSSFCell cell = row.getCell(j);
                    XSSFCellStyle cellStyle = cell.getCellStyle();
                    listCellStyle.add(cellStyle);
                }
                //加载数据
                for (int i = 0; i < listData.size(); i++) {
                    List<String> rowValues = listData.get(i);
                        row = sheet.createRow(i + startRow);
                        row.setRowStyle(rowStyle);
                        row.setHeight(height);
                        for (int j = 0; j < rowValues.size(); j++) {
                            XSSFCell cell = row.createCell(j);
                            String value = rowValues.get(j);
                            boolean isNum = StringUtil.isNum(value);
                            if (isNum) {
                                cell.setCellValue(Double.parseDouble(value));
                                cell.setCellStyle(listCellStyle.get(j));
                            } else {
                                cell.setCellValue(value);
                                cell.setCellStyle(listCellStyle.get(j));
                            }
                        }

                }
                //对不同的浏览器下载excel的中文乱码处理
                String filename =StringUtil.doMessyCode(request, fileName);
                response.setHeader("Content-Disposition", "attachment; filename=" + filename);
                OutputStream out = response.getOutputStream();
//                response.reset();//清空输出流  
                wb.write(out);// 写入File
                out.flush();
                out.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else {// 直接抛出异常
            throw new MyException("找不到对应的模板,所以导不出数据");
        }

    }