java 生成excel表传给前端下载

js部分：

        var jsonstr=getSearchSel(os);
        var str = "";//传参数
        for(var i in jsonstr){
            if(jsonstr[i]!=""){
                str += i+"="+jsonstr[i]+"&";
            }
        }
        str = str.substr(0, str.length - 1); 
        var url = "/QAdevices/ExcelServlet?" + str;
        window.open(url);

java端：

 public void doGet(HttpServletRequest request, HttpServletResponse response)
	      throws ServletException, IOException {
		  StringBuilder jsonstr = new StringBuilder();//转化成json
		  jsonstr.append("{");
		  String reqstr = request.getQueryString();//获取请求参数
		  if(!"".equals(reqstr) &&reqstr !=null){

			  String [] stringArr= reqstr.split("&");	
			  for(int i = 0;i> searchlist = ServerInit.managerAction.searchDeviceInfoByConditions3(jsonstr.toString());	
			
		  if(searchlist!=null){				
			  HSSFWorkbook wb = createExcel(searchlist);		 
			  try{ //写入浏览器
		        	response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));
		        	OutputStream outputStream=response.getOutputStream();
		        	wb.write(outputStream);
		        	outputStream.flush();
		        	outputStream.close();
		        }catch(Exception e){
		        	logger.error("Exception",e);
		        }
		  }				
	  }

/**    
	 *  返回excel表生成的路径
	 *  参数  
	 *  os,devicestatue，peopleId
	 * @return excel表的服务器存储地址
	 * */
	public String getExcelPath() {
		//String str = this.getServletContext().getRealPath("/WEB-INF");		  
		List> searchlist = null;
		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
		String timestr = df.format(new Date()).toString().replace(" ", "-");
		timestr = timestr.replace(":","");
		String filename = "设备一览表-"+ timestr+".xls";
		logger.info("下载:"+filename);
		return filename;
	}
	
	/**    
	 *  创建excel表
	 *  参数  
	 *  数据库查询数据list，存储路径
	 * @return boolean true:生成成功  false: 生成失败
	 * @throws  
	 * */
	public HSSFWorkbook createExcel(List> list) {
		
		boolean bool = true;	
		// 第一步，创建一个webbook，对应一个Excel文件 
		//XSSFWorkbook  wb = new XSSFWorkbook();
        HSSFWorkbook wb = new HSSFWorkbook();  
        // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet  
        HSSFSheet sheet = wb.createSheet("设备信息");  
        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short  
        HSSFRow row = sheet.createRow((int) 0);  
        // 第四步，创建单元格，并设置值表头 设置表头居中  
        HSSFCellStyle style = wb.createCellStyle();  
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式  
        ArrayList title = new ArrayList<>(Arrays.asList("编号","设备编号","品牌名称","品牌","系统","系统版本","cpu","cpu型号","内存大小","屏幕尺寸","分辨率高","分辨率宽","imei1","imei2","sn","是否越狱","颜色","前置摄像头","后置摄像头","数据线","充电器","耳机","电池","手机壳","入库时间","设备管理员","借用人","状态","备注"));  
      //  System.out.println(title.size());
        HSSFCell cell;
        for(int i = 0 ;i title2 = new ArrayList<>(Arrays.asList("必填","必填","必填","必填","android/ios","必填","厂商","厂商+型号","","","","","必填","","","0=否，1=是","","单位万","单位万","0=否，1=是","0=否，1=是","0=否，1=是","0=否，1=是","0=否，1=是","","","","状态(0完好 1破损 2老旧 3待修复 4已坏)",""));
       // System.out.println(title2.size());
        for(int i = 0 ;i map : list) {//填充数据
        	row2 = sheet.createRow((int) i+2); 
        	List datalist = getData(map);
        	for( j = 0 ;j一行数据
	 * @return datalist
	 * */
	public List getData(Map map){
		List stringList = new ArrayList();
		for(Map.Entry entry : map.entrySet()){
			if(entry.getValue() == null){
				entry.setValue("");
			}
			if(entry.getValue() instanceof Boolean){//false:0 true:1
				if((Boolean)entry.getValue()){
					entry.setValue(1);
				}
				else {
					entry.setValue(0);
				}
			}
		}
		stringList.add(map.get("deviceid").toString());			
		stringList.add(map.get("tag").toString());
		stringList.add(map.get("model").toString());
		stringList.add(map.get("brand").toString());
		stringList.add(map.get("os").toString());
		stringList.add(map.get("osversion").toString());
		stringList.add(map.get("cpu").toString());
		stringList.add(map.get("cpumodel").toString());
		stringList.add(map.get("mem").toString());
		stringList.add(map.get("screensize").toString());
		stringList.add(map.get("resolution_high").toString());
		stringList.add(map.get("resolution_width").toString());
		stringList.add(map.get("imei1").toString());
		stringList.add(map.get("imei2").toString());
		stringList.add(map.get("sn").toString());
		stringList.add(map.get("root").toString());
		stringList.add(map.get("color").toString());
		stringList.add(map.get("frontcam").toString());
		stringList.add(map.get("backcam").toString());
		stringList.add(map.get("usbcable").toString());
		stringList.add(map.get("charger").toString());
		stringList.add(map.get("headset").toString());
		stringList.add(map.get("battery").toString());
		stringList.add(map.get("phoneshell").toString());
		stringList.add(map.get("adddate").toString());
		stringList.add(map.get("managername").toString());
		stringList.add(map.get("name").toString());
		stringList.add(map.get("devicestatus").toString());
		stringList.add(map.get("devicenotes").toString());
		
		return stringList;
		
	}
}