poi和excel下载

//前端设置下载方法

function f_exportGrid(){
    var para = $("#form1").serializeArray()
    var url = action+'!exportGrid.action?';
    for(var i=0;i<para.length;i++){
        url += para[i].name+'='+para[i].value+'&';//加入参数
    } 
    var pageNo = gridManager.options.page;
    var pageSize = gridManager.options.pageSize;
    url += 'pageNo='+pageNo;
    url += '&pageSize='+pageSize;
    location.href=url;//下载行为
}

//后台

public void exportGrid1(List list) throws IOException {
        // 生成Excel文件
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("数据");
        HSSFCellStyle cellStyle = wb.createCellStyle();
        cellStyle.setAlignment(HorizontalAlignment.CENTER);// 左右居中 
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 上下居中
        cellStyle.setBorderTop(BorderStyle.THIN);// 上边框 细边线
        cellStyle.setBorderBottom(BorderStyle.THIN);// 下边框 细边线
        cellStyle.setBorderLeft(BorderStyle.THIN);// 左边框 细边线
        cellStyle.setBorderRight(BorderStyle.THIN);// 右边框 细边线
        // 设置字体样式
        Font titleFont = wb.createFont();
        titleFont.setFontHeightInPoints((short) 13); // 字体高度
        titleFont.setFontName("宋体"); // 字体样式
        titleFont.setBold(true);
        cellStyle.setFont(titleFont); 
        String name = "";
        int start=0;
        int num = 0 ;
        for (int i = 0; i < list.size(); i++) {
        Map map = (Map)list.get(i);
        String name1 = map.get("UserName").toString();
        if(!name1.equals(name) ){

        if(StringUtils.isBlank(name)){
        name=name1;
        }else{
        if(num != 1){
        int end = num+start-1;
        sheet.addMergedRegion(new CellRangeAddress(start,end,0,0));  //设置合并列
        sheet.addMergedRegion(new CellRangeAddress(start,end,3,3));//设置合并列
        }
        name = name1;
        }
        start = i+1;
        num=1;
        }else{
        num ++ ;
        if(name1.equals(name) && i==list.size()-1){
        int end = num+start-1;
        sheet.addMergedRegion(new CellRangeAddress(start,end,0,0));
        sheet.addMergedRegion(new CellRangeAddress(start,end,3,3));
        }
        //start = i;
        }
        }
        // 表头
        String[] heararr = {"人员","点位","时长(单位：分钟)","总时长(单位：分钟)"};
        //System.err.println("heararr: "+heararr.length);
        HSSFRow headRow = sheet.createRow(0);
        for (int i = 0; i < heararr.length; i++) {
        HSSFCell cell = headRow.createCell(i);
        cell.setCellValue(heararr[i]);
        cell.setCellStyle(cellStyle);
        sheet.autoSizeColumn(i);// 自动设置宽度
        }
        HSSFCellStyle dataStyle = wb.createCellStyle();
        dataStyle.setAlignment(HorizontalAlignment.CENTER);// 左右居中 
        dataStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 上下居中
        dataStyle.setBorderTop(BorderStyle.THIN);// 上边框 细边线
        dataStyle.setBorderBottom(BorderStyle.THIN);// 下边框 细边线
        dataStyle.setBorderLeft(BorderStyle.THIN);// 左边框 细边线
        dataStyle.setBorderRight(BorderStyle.THIN);// 右边框 细边线
        Font dataFont = wb.createFont();
        dataFont.setFontHeightInPoints((short) 11); // 字体高度
        titleFont.setFontName("宋体"); // 字体样式
        dataStyle.setFont(dataFont);
        dataStyle.setWrapText(true);//设置自动换行 
        for (int i = 0; i < list.size(); i++) {
        HSSFRow dataRow = sheet.createRow(sheet.getLastRowNum() + 1);
        Map map = (Map)list.get(i);
        HSSFCell cell1 = dataRow.createCell(0);
        cell1.setCellValue(map.get("UserName").toString());
        cell1.setCellStyle(dataStyle);
        sheet.autoSizeColumn(0);// 自动设置宽度
        cell1 = dataRow.createCell(1);
        cell1.setCellValue(map.get("OutfallsName").toString());
        cell1.setCellStyle(dataStyle);
        sheet.autoSizeColumn(1);// 自动设置宽度
        cell1 = dataRow.createCell(2);
        cell1.setCellValue(map.get("Num").toString());
        cell1.setCellStyle(dataStyle);
        sheet.autoSizeColumn(2);// 自动设置宽度
        cell1 = dataRow.createCell(3);
        cell1.setCellValue(map.get("Sum").toString());
        cell1.setCellStyle(dataStyle);
        sheet.autoSizeColumn(3);// 自动设置宽度
        }
        // 下载导出
        // 设置头信息


        ServletActionContext.getResponse().setContentType(
        "application/vnd.ms-excel");
        String filename = "任务人员.xls";
        HttpServletRequest request = ServletActionContext.getRequest();
        filename = processFileName(request,filename);
        ServletActionContext.getResponse().setHeader("Content-Disposition",
        "attachment;filename=" + filename);

        ServletOutputStream outputStream = ServletActionContext.getResponse()
        .getOutputStream();
        wb.write(outputStream);

        wb.close();
    }
    
    //解决设置名称时的乱码
    public static String processFileName(HttpServletRequest request, String fileNames) {
        String codedfilename = null;
        try {
            String agent = request.getHeader("USER-AGENT");
            if (null != agent && -1 != agent.indexOf("MSIE") || null != agent
                    && -1 != agent.indexOf("Trident")) {// ie
 
                String name = java.net.URLEncoder.encode(fileNames, "UTF8");
 
                codedfilename = name;
            } else if (null != agent && -1 != agent.indexOf("Mozilla")) {// 火狐,chrome等
 
 
                codedfilename = new String(fileNames.getBytes("UTF-8"), "iso-8859-1");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return codedfilename;
    }

 //复杂表头

// 表头
        String[] hear0 = {"罐号","物料名称","容积","安高m","检验状态","昨日库存","昨日库存","昨日库存","14:00"
                ,"14:00","22:00","22:00","6:00","6:00","6:00","6:00","库存差量","移动"
                ,"备注"};
        String[] headnum0 = {"0,1,0,0","0,1,1,1","0,1,2,2","0,1,3,3","0,1,4,4","0,0,5,7",
                "0,0,8,9","0,0,10,11","0,0,12,15","0,1,16,16","0,1,17,17","0,1,18,18"};
        
         String[] hear1 = {"罐号","物料名称","容积","安高m","检验状态","昨日库存","液位m","质量t",
                 "液位m","质量t","液位m","质量t","液位m","质量t"
                ,"物料合计量","库存差量（单罐）","库存差量","移动","备注"};
         String[] dataNames = {"tankCode","tankAlias","vol","safeHight","testState","preStock",
                 "lastLvl","lastMass","lvl14","mass14","lvl22","mass22","lvl6","mass6","stock",
                 "stockDiff","numStockDiff","moveState","moveStateEdit"};
        HSSFRow headRow = sheet.createRow(0);
        for (int i = 0; i < hear0.length; i++) {
            Cell cell = headRow.createCell(i);
            cell.setCellStyle(cellStyle);
            cell.setCellValue(hear0[i]);
        }
        
        // 动态合并单元格
        for (int i = 0; i < headnum0.length; i++) {

            // sheet.autoSizeColumn(i, true);
            String[] temp = headnum0[i].split(",");
            Integer startrow = Integer.parseInt(temp[0]);
            Integer overrow = Integer.parseInt(temp[1]);
            Integer startcol = Integer.parseInt(temp[2]);
            Integer overcol = Integer.parseInt(temp[3]);
            sheet.addMergedRegion(new CellRangeAddress(startrow, overrow, startcol, overcol));
        }

        headRow = sheet.createRow(1);// 创建表头2

        for (int i = 0; i < hear1.length; i++) {
            Cell cell = headRow.createCell(i);
            cell.setCellStyle(cellStyle);
            cell.setCellValue(hear1[i]);
        }