解决getOutputStream() has already been called for this response

java.lang.IllegalStateException: getOutputStream() has already been called for this response

//strut2 导出excel


//解决问题的代码

HSSFWorkbook workbook=productEcel(list,partTimer);
				response.reset();
				response.setContentType("contentType=application/vnd.ms-excel");
				response.setHeader("Content-disposition","attachment;filename="+URLEncoder.encode("统计.xls","utf-8")); 
				workbook.write(response.getOutputStream());
				response.flushBuffer();

//出现异常的原因

产生这样的异常原因:是web容器生成的servlet代码中有out.write(""),这个和JSP中调用的response.getOutputStream()产生冲突.即Servlet规范说明，不能既调用response.getOutputStream()，又调用response.getWriter(),无论先调用哪一个，在调用第二个时候应会抛出IllegalStateException，因为在jsp中，out变量实际上是通过response.getWriter得到的，你的程序中既用了response.getOutputStream，又用了out变量，故出现以上错误。

//导出 excel

public String exportRedactor(){
		HttpServletRequest request =this.getRequest();
		HttpServletResponse response=null;
		FbbServiceClient service=null;
		ManagerUser user= (ManagerUser)request.getSession(true).getAttribute(Constants.SESSION_USER);
		InputStream is = null;
		PrintWriter out=null;
		try {
			method="";
			response=this.getResponse();
			response.setCharacterEncoding("utf-8");

			service=new FbbServiceClient();
			FbbService.Client client=service.open();
			if(partTimer == null)
				partTimer = new PartTimer();
			partTimer.setSourceId(2);
			List list = client.getStatisticsPartTimer(user.getId(), user.getSignature(), partTimer);
			String result="";

			if(list==null || list.size()<=0){
				request.setAttribute("msg","没有数据需要导出");
				return SUCCESS; 
			}else{HSSFWorkbook workbook=productEcel(list,partTimer);
				response.reset();
				response.setContentType("contentType=application/vnd.ms-excel");
				response.setHeader("Content-disposition","attachment;filename="+URLEncoder.encode("统计.xls","utf-8")); 
				workbook.write(response.getOutputStream());
				response.flushBuffer();
			}

		} catch (Exception e) {
			e.printStackTrace();
			request.setAttribute("msg","导出数据出现异常");
			logger.error("errorcode ::: " + e.getMessage(), e);
		}finally{
			if(service!=null)
				service.close();
			if(out!=null){
				try {
					out.close();
				} catch (Exception e) {
					logger.error("errorcode ::: " + e.getMessage(), e);
				}
			}

			if(is!=null){
				try {
					is.close();
				} catch (Exception e) {
					logger.error("errorcode ::: " + e.getMessage(), e);
				}
			}
		}
		return NONE;


private HSSFWorkbook productEcel(List list,PartTimer partTimer) throws Exception {

		// 创建工作表和标题
		HSSFWorkbook workbook = null;
		try {
			workbook = new HSSFWorkbook();
		} catch (Exception e) {
			e.printStackTrace();
		}

		// 定义字体
		HSSFFont celltbnamefont = workbook.createFont();
		celltbnamefont.setFontHeightInPoints((short) 12); // 字体大小
		celltbnamefont.setColor((short) (HSSFFont.COLOR_NORMAL)); // 颜色
		celltbnamefont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); // 粗体




		// 定义 date 的数据样式
		HSSFCellStyle datestyle = workbook.createCellStyle();
		HSSFDataFormat df = workbook.createDataFormat();
		datestyle.setAlignment((short) HSSFCellStyle.ALIGN_LEFT);
		datestyle.setDataFormat(df.getFormat("yyyy-mm-dd hh:mm:ss"));

		// 定义 int 的数据样式
		HSSFCellStyle intdatestyle = workbook.createCellStyle();
		intdatestyle.setAlignment((short) HSSFCellStyle.ALIGN_LEFT);

		// 定义 float 的数据样式
		HSSFCellStyle floatdatestyle = workbook.createCellStyle();
		floatdatestyle.setAlignment((short) HSSFCellStyle.ALIGN_LEFT);
		df = workbook.createDataFormat();
		floatdatestyle.setDataFormat(df.getFormat("#.##"));

		// 定义 long 的数据样式
		HSSFCellStyle longdatestyle = workbook.createCellStyle();
		longdatestyle.setAlignment((short) HSSFCellStyle.ALIGN_LEFT);

		//title样式
		HSSFCellStyle titledatestyle = workbook.createCellStyle();
		titledatestyle.setAlignment((short) HSSFCellStyle.ALIGN_CENTER_SELECTION);
		titledatestyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
		//titledatestyle.setFillBackgroundColor(HSSFColor.BLUE.index2);
		titledatestyle.setFont(celltbnamefont);

		// 定义列的样式
		HSSFCellStyle items_style = workbook.createCellStyle();
		items_style.setAlignment((short) HSSFCellStyle.ALIGN_CENTER); // 设置对其方式
		items_style.setFont(celltbnamefont);
		items_style.setWrapText(false); // 设置自动换行
		items_style.setFillForegroundColor(HSSFColor.ROSE.index);// 设置背景色
		items_style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		items_style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
		items_style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
		items_style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
		items_style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框

		HSSFCellStyle row_style = workbook.createCellStyle();
		titledatestyle.setAlignment((short) HSSFCellStyle.ALIGN_CENTER_SELECTION);
		titledatestyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);

		/*
		row_style.setAlignment((short) HSSFCellStyle.ALIGN_CENTER); // 设置对其方式
		row_style.setFont(celltbnamefont);
		row_style.setWrapText(false); // 设置自动换行
		row_style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		row_style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
		row_style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
		row_style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
		row_style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
		*/


		int rowIndex = 0;
		String sheetName="兼职信息及酬劳统计";
		String head="兼职信息及酬劳统计";
		if(!Misc.isStringEmpty(partTimer.getStime())){
			head+="（时间："+partTimer.getStime()+"-"+partTimer.getEtime()+"）";
		}

		HSSFSheet sheet = workbook.createSheet(sheetName); // 创建工作区
		//sheet.setDefaultRowHeightInPoints(100);
		//sheet.setDefaultRowHeight((short)100);


		//合并14列 用于写 表格名称
		Region region = new Region();
	    region.setRowFrom(0);
        region.setRowFrom(0);
        region.setColumnFrom((short)0);
        region.setColumnTo((short)14);
        sheet.addMergedRegion(region);

        //将list 数据 打印到表格中
      	HSSFCell cell;

      	//表头信息
		HSSFRow heandRow =  sheet.createRow((short) rowIndex);
		cell=heandRow.createCell(0);
		cell.setCellStyle(titledatestyle);
		cell.setCellValue(head);
		heandRow.setHeightInPoints(30);



		// 创建数据列名
		String titles[] = {"序号","姓名","xx名","xxID","性别","QQ","手机", "微信","微博名及粉丝","应发数量","实发数量","审核通过数","酬劳","支付宝","备注"};

		HSSFRow row =sheet.createRow((short) (++rowIndex));
		// 加入 标题
		for (int i = 0; i < titles.length; i++) {
			cell = row.createCell(i, Cell.CELL_TYPE_STRING); // 设置 列类型
			if (i ==8 || i ==11 || i==14) {
				sheet.setColumnWidth(i, 5500);
			} else {
				sheet.setColumnWidth(i, 4000);
			}
			cell.setCellValue(titles[i]);
			cell.setCellStyle(items_style);
		}
		Iterator it = list.iterator();
		int index=0;
		while (it.hasNext()) {
			HSSFRow dataRow = sheet.createRow((short) (++rowIndex));
			dataRow.setHeightInPoints(20);
			dataRow.setRowStyle(row_style);

			PartTimer obj = it.next();
			cell = dataRow.createCell(0, Cell.CELL_TYPE_NUMERIC);
			cell.setCellStyle(longdatestyle);
			cell.setCellValue(++index);

			cell = dataRow.createCell(1, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getRealName());

			cell = dataRow.createCell(2, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getUserName());

			cell = dataRow.createCell(3, Cell.CELL_TYPE_NUMERIC);
			cell.setCellStyle(longdatestyle);
			cell.setCellValue(obj.getId());

			cell = dataRow.createCell(4, Cell.CELL_TYPE_STRING);
			cell.setCellValue( "1".equals(obj.getPgender()) ? "男":"女");

			cell = dataRow.createCell(5, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getPqq());

			cell = dataRow.createCell(6, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getPmobile());

			cell = dataRow.createCell(7, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getPweixin());

			cell = dataRow.createCell(8, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getPweibo());

			cell = dataRow.createCell(9, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getRequire());

			cell = dataRow.createCell(10, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getPicCount());

			cell = dataRow.createCell(11, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getPassCount());


			cell = dataRow.createCell(12, Cell.CELL_TYPE_NUMERIC);
			cell.setCellStyle(floatdatestyle);
			cell.setCellValue(obj.getRepay());

			cell = dataRow.createCell(13, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getAlipay());

			cell = dataRow.createCell(14, Cell.CELL_TYPE_STRING);
			cell.setCellValue(obj.getRemark());

		}
		//sheet.setColumnWidth(9, 2730);
		//sheet.setColumnWidth(12, 2730);



		/*HSSFRow dataRow = sheet.createRow((short) (++rowIndex));
		cell = dataRow.createCell(0, Cell.CELL_TYPE_STRING);
		cell.setCellStyle(intdatestyle);
		cell.setCellValue("合计:");

		cell = dataRow.createCell(1, Cell.CELL_TYPE_STRING);
		cell.setCellValue("");

		// 添加 公式
		cell = dataRow.createCell(2, Cell.CELL_TYPE_NUMERIC);
		cell.setCellStyle(longdatestyle);
		cell.setCellFormula("SUM(" + getColLetter(2)
				+ sheet.getRow(2).getCell(2).getRowIndex() + ":"
				+ getColLetter(2)
				+ sheet.getRow(sheet.getLastRowNum()).getCell(2).getRowIndex()
				+ ")");
		// 添加 公式
		cell = dataRow.createCell(3, Cell.CELL_TYPE_NUMERIC);
		cell.setCellStyle(longdatestyle);
		cell.setCellFormula("SUM(" + getColLetter(3)
				+ sheet.getRow(2).getCell(3).getRowIndex() + ":"
				+ getColLetter(3)
				+ sheet.getRow(sheet.getLastRowNum()).getCell(3).getRowIndex()
				+ ")");*/

		/*String workDir = ServletActionContext.getServletContext().getRealPath("/");

		String workddd = workDir.replaceAll("\\\\", "/");

		Calendar calendar = Calendar.getInstance();
		String month = calendar.get(Calendar.YEAR) + "/"
				+ (calendar.get(Calendar.MONTH) + 1);
		String filePath = "newsxls/adxls/" + month + "/";
		File f = new File(workDir + filePath);
		if (!f.isDirectory()) {
			f.mkdirs();
		}

		String fileNameCode = java.util.UUID.randomUUID().toString();
		String completeFilePath = workddd + filePath + fileNameCode + ".xls";
		FileOutputStream fileOut = new FileOutputStream(completeFilePath);
		workbook.write(fileOut);
		fileOut.flush();
		fileOut.close();*/

		return workbook;
	}