java poi excel 导出实例

以springMVC为例：
1.controller:

/**
     * 导出
     * @param request
     * @param response
     */
    @RequestMapping("/exportDiscountRatioExcel")
    public void exportDiscountRatioExcel(HttpServletRequest request,HttpServletResponse response)
    {
        Map paramsMap = getPageParams(request);
        
        try {
            Workbook wb = manager.exportExcel(request, paramsMap);
            String excelName = java.net.URLEncoder.encode("价格监测-车型折扣对比", "UTF-8");
            response.setContentType("application/vnd.ms-excel;charset=utf-8");  
            response.setHeader("Content-Disposition", "attachment;filename="+excelName+".xls" );  
            ServletOutputStream out = response.getOutputStream();  
            wb.write(out);
            
            //先把EXCEL写到临时目录，用来获取文件大小，最后删除
            File f = new File(request.getSession().getServletContext().getRealPath("/") + "/demoExcel/demo.xls");
            if(!f.exists())
            {
                f.createNewFile();
            }
            BufferedOutputStream s = new BufferedOutputStream(new FileOutputStream(f));
            wb.write(s);
            
            //关闭流
            s.flush();
            s.close();
            out.flush();
            out.close();
            
            //记录导出日志，并删除临时文件
            paramsMap.put("exportSize", AppFrameworkUtil.getNum(f.length()/1024, 0));
            logManager.updateModuleLog(paramsMap);
            f.delete();
            
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

2.serviceImpl:

      /**
       * 导出
       */
    @Override
    public Workbook exportExcel(HttpServletRequest request,Map paramsMap) 
    {
        Workbook wb = null;
        String json = (String) request.getSession().getAttribute(Constant.getExportExcelDataKey);
        String languageType = (String) paramsMap.get("languageType");//导出语言
        if(!AppFrameworkUtil.isEmpty(json))
        {
            JSONObject obj = (JSONObject) JSONObject.parse(json);
            JSONArray gridObj = (JSONArray) obj.getJSONArray("grid");
            
            try {
                //读取模块路径
                String path = request.getSession().getServletContext().getRealPath("/"); 
                wb = new HSSFWorkbook(new FileInputStream(new File(path+"excelExample/discountRatio.xls")));
                //导图
                exportLineChartExcel(wb,wb.getSheet("DATA"),gridObj,languageType);
                //导表格
                exportOriginalData(wb,wb.getSheet("原数据"),gridObj,languageType,paramsMap);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return wb;
    }
    
    /**
     * 导出原始数据
     * @param wb
     * @param s
     * @param gridObj
     * @param paramsMap
     */
    public void exportOriginalData(Workbook wb,Sheet s,JSONArray gridObj,String languageType,Map paramsMap)
    {
        String[] titles = null;//标题数组
        if("EN".equals(languageType)) 
        {
            titles = new String[]{"Date","Code","Segment","Manufacture","Model","Engine Capacity","Transmission","Trim","Bodytype","Launch Date","Model Year","MSRP(RMB)"
                    ,"TP（RMB）","Discount（RMB）","Discount Rate","VS Month","VS Change"};
        }
        else 
        {
            titles = new String[]{"日期","车型编码","级别","厂商","车型","排量","排档方式","型号标识","车身形式","上市日期","年式","厂商指导价"
                    ,"最低参考价加权值","折扣(元)","折扣率","VS上月","VS变化"};
        }
        int rowIndex = 0;//行号锁引
        int cellIndex = 0;//列锁引
        Row row = ExportExcelUtil.createRow(s, rowIndex, 400);
        
        CellStyle titleStyle = ExportExcelUtil.getExcelTitleBackgroundStyle(wb);//表格标题样式
        CellStyle textStyle = ExportExcelUtil.getExcelFillTextStyle(wb);//内容文本样式
        CellStyle thousandthStyle = ExportExcelUtil.getExcelFormatThousandthStyle(wb);//格式化千分位样式
        CellStyle percentageStyle = ExportExcelUtil.getExcelFillPercentageStyle(wb);//格式化百分号样式
        
        //保存线图刻度最大值与最小值，供数据部使用
        Cell cell = row.createCell(40);
        ExportExcelUtil.setCellValueAndStyle(cell, AppFrameworkUtil.getNum(paramsMap.get("ymax").toString(), 0)+".0~", textStyle);
        cell = row.createCell(41);
        ExportExcelUtil.setCellValueAndStyle(cell, AppFrameworkUtil.getNum(paramsMap.get("ymin").toString(), 0)+".0~", textStyle);
        cell = row.createCell(42);
        ExportExcelUtil.setCellValueAndStyle(cell, languageType, textStyle);
        
        //写标题
        for(String title : titles)
        {
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, title, titleStyle);
            s.setColumnWidth(cell.getColumnIndex(), 3000);
        }
        //写数据
        for(int i = 0; i < gridObj.size(); i++)
        {
            JSONObject obj = gridObj.getJSONObject(i);
            row = ExportExcelUtil.createRow(s, ++rowIndex, 400);
            cellIndex = 0;
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, obj.getString("yearMonth")+"~", textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, obj.getString("versionCode")+"~", textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, getValueByLanguageType(obj,languageType,"gradeName"), textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, getValueByLanguageType(obj,languageType,"manfName"), textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, getValueByLanguageType(obj,languageType,"subModelName"), textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, obj.getString("discharge"), textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, getValueByLanguageType(obj,languageType,"gearMode"), textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, getValueByLanguageType(obj,languageType,"typeId"), textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, getValueByLanguageType(obj,languageType,"bodyType"), textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, obj.getString("versionLaunchDate"), textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, obj.getString("modelYear"), textStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, obj.getString("msrp"), thousandthStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, AppFrameworkUtil.getNum(obj.getString("tp"),7), thousandthStyle);
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, AppFrameworkUtil.getNum(obj.getString("discount"),7), thousandthStyle);
            
            cell = row.createCell(cellIndex++);
            if("".equals(obj.getString("discountRate")) || "-".equals(obj.getString("discountRate"))){
                ExportExcelUtil.setCellValueToPercentage(cell, "-", percentageStyle);
            } else{
                ExportExcelUtil.setCellValueToPercentage(cell, obj.getString("discountRate"), percentageStyle);
            }
            
            cell = row.createCell(cellIndex++);
            ExportExcelUtil.setCellValueAndStyle(cell, AppFrameworkUtil.getNum(obj.getString("vsDiscount"),7), thousandthStyle);
            
            cell = row.createCell(cellIndex++);
            if("".equals(obj.getString("vsDiscountRate")) || "-".equals(obj.getString("vsDiscountRate"))){
                ExportExcelUtil.setCellValueToPercentage(cell, "-", percentageStyle);
            } else{
                ExportExcelUtil.setCellValueToPercentage(cell, obj.getString("vsDiscountRate"), percentageStyle);
            }
        }
        s.setDisplayGridlines(false);
    }