java导出excel格式数据

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 在java web开发中，很多情况下都会用到导出excel数据的功能，下面我对我做的一个例子做下简单的介绍，希望对大家有所帮助。

java导出excel的方式有很多种，如利用poi导出，如利用jxl导出，现在我要说的就是利用jxl方式导出

首先，需要添加jar包：jxl.jar，其他java需要的包自行添加；

然后，请看下面代码：

/**
	 * excel 文件下载操作
	 * @param result  List数组，需要导出的对象列表
	 * @param response
	 * @throws RowsExceededException
	 * @throws WriteException
	 * @throws IOException
	 */
	public static void downloadFile(List result, HttpServletResponse response) throws RowsExceededException, WriteException, IOException{

		String xlsFileName  = "subapplyinfo.xls";
		   WritableWorkbook book=
			   Workbook.createWorkbook(new File(xlsFileName));
		   //生成名为"第一页"的工作表，参数0表示这是第一页
		   WritableSheet sheet=book.createSheet("第一页",0);
		   

		  //设置字体为宋体,11号字,加粗,颜色为黑色
		   WritableFont font1=new WritableFont(WritableFont.createFont("宋体"),11,WritableFont.BOLD); 
		   font1.setColour(Colour.BLACK);
		   WritableCellFormat format1=new WritableCellFormat(font1);
		   format1.setAlignment(jxl.format.Alignment.CENTRE);
		   format1.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);
		   Label labelA = new Label(0,0,"申请类型",format1);
		   Label labelB = new Label(1,0,"活动名称",format1);
		   Label labelC = new Label(2,0,"姓名",format1);
		   Label labelD = new Label(3,0,"性别",format1);
		   Label labelE = new Label(4,0,"联系电话",format1);
		   Label labelF = new Label(5,0,"意向车型",format1);
		   Label labelG = new Label(6,0,"预约时间",format1);
		   Label labelH = new Label(7,0,"邮箱地址",format1);
		   Label labelI = new Label(8,0,"所在城市",format1);
		   Label labelJ = new Label(9,0,"提交时间",format1);
		   Label labelK = new Label(10,0,"备注",format1);
		   //将定义好的单元格添加到工作表中
		   sheet.addCell(labelA);
		   sheet.addCell(labelB);
		   sheet.addCell(labelC);
		   sheet.addCell(labelD);
		   sheet.addCell(labelE);
		   sheet.addCell(labelF);
		   sheet.addCell(labelG);
		   sheet.addCell(labelH);
		   sheet.addCell(labelI);
		   sheet.addCell(labelJ);
		   sheet.addCell(labelK);
		   for (int ii = 0; ii < result.size(); ii++) {
			   SubApplyInfos vo = (SubApplyInfos)result.get(ii);
			   Label labelA1 = new Label(0,ii+1,vo.getApplyType());
			   Label labelB1 = new Label(1,ii+1,vo.getApplyTitle());
			   Label labelC1 = new Label(2,ii+1,vo.getApplyName());
			   Label labelD1 = new Label(3,ii+1,vo.getApplySex());
			   Label labelE1 = new Label(4,ii+1,vo.getApplyTel());
			   Label labelF1 = new Label(5,ii+1,vo.getApplyCar());
			   Label labelG1 = new Label(6,ii+1,vo.getApplyTime());
			   Label labelH1 = new Label(7,ii+1,vo.getApplyEmail());
			   Label labelI1 = new Label(8,ii+1,vo.getApplyCity());
			   SimpleDateFormat f1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			   Label labelJ1 = null;
			   if(vo.getCreateTime() != null && !"".equals(vo.getCreateTime())){
				   labelJ1 = new Label(9,ii+1,f1.format(vo.getCreateTime()));
			   }else{
				   labelJ1 = new Label(9,ii+1,"");
			   }
			   
			   Label labelK1 = new Label(10,ii+1,vo.getApplyRemark()); 
			   
			   sheet.addCell(labelA1);
			   sheet.addCell(labelB1);
			   sheet.addCell(labelC1);
			   sheet.addCell(labelD1);
			   sheet.addCell(labelE1);
			   sheet.addCell(labelF1);
			   sheet.addCell(labelG1);
			   sheet.addCell(labelH1);
			   sheet.addCell(labelI1);
			   sheet.addCell(labelJ1);
			   sheet.addCell(labelK1);
		   }
		   //写入数据并关闭文件
		   book.write();
		   book.close();
		   System.out.println("创建文件成功!");

		   OutputStream outputS = response.getOutputStream();
		   response.reset();
		   // response.setContentType("application/octet-stream; charset=GB2312");
			
		   response.setContentType("application/vnd.ms-excel; charset=GB2312");
		   response.setHeader("Content-Disposition", "attachment;filename=\""
					+ xlsFileName.substring(xlsFileName.lastIndexOf("/") + 1)
					+ "\"");
			
		   InputStream in = new FileInputStream(new File(xlsFileName));
		   if (in != null) {
			   byte[] b = new byte[2048];
			   int len = 0;
			   while ((len = in.read(b)) > 0) {
				   outputS.write(b, 0, len); // 
				   outputS.flush();
			   }
			   outputS.close();
			   in.close();
			}
	}

 

代码中便是导出excel数据的具体操作方法，其原理便是：先将数据存储到临时excel文件中，然后再将该excel文件以文件下载的方式下载到客户端，从而实现了导出excel数据的功能。

注意，这段代码并不是通用，如果有需要实现该功能的朋友，请复制后自行修改，当然，有心的朋友可以将它修改成通用方法，相信也不是件困难的事情。

 

******************************************************************************************************************************************************************************************************************************************

上面的那种方式，需要先把数据放到一个excel文件中，然后再利用下载的方式将excel文件下载下来，下面是一种更直接的方式，可以将数据直接通过io流输出到excel文件中

public ActionForward exportExcel(ActionMapping mapping, ActionForm form,
                                     HttpServletRequest request, HttpServletResponse response){
     	try {
              // 取得输出流
                OutputStream os = response.getOutputStream();
                // 清空输出流
                response.reset();
                //设定输出文件头
                response.setHeader("Content-disposition", "attachment; filename=" + path);
                // 定义输出类型
                response.setContentType("application/msexcel");
                        
              if (result.size() > 0) {
                // 调用生成excel文件
                	writeExcel2(os , result);
              }
              os.close();
        } catch (Exception e) {
            	log.error(e.getMessage(), e);
        } 
     
}

  下面的代码，跟一开始的代码基本相同，没有多大差别

 

public void writeExcel2(InputStream os , List result){
    WritableWorkbook book=
			   Workbook.createWorkbook(os);
		   //生成名为"第一页"的工作表，参数0表示这是第一页
		   WritableSheet sheet=book.createSheet("第一页",0);	   

		  //设置字体为宋体,11号字,加粗,颜色为黑色
		   WritableFont font1=new WritableFont(WritableFont.createFont("宋体"),11,WritableFont.BOLD); 
		   font1.setColour(Colour.BLACK);
		   WritableCellFormat format1=new WritableCellFormat(font1);
		   format1.setAlignment(jxl.format.Alignment.CENTRE);
		   format1.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);
		   Label labelA = new Label(0,0,"申请类型",format1);
		   Label labelB = new Label(1,0,"活动名称",format1);
		   Label labelC = new Label(2,0,"姓名",format1);
		   Label labelD = new Label(3,0,"性别",format1);
		   Label labelE = new Label(4,0,"联系电话",format1);
		   Label labelF = new Label(5,0,"意向车型",format1);
		   Label labelG = new Label(6,0,"预约时间",format1);
		   Label labelH = new Label(7,0,"邮箱地址",format1);
		   Label labelI = new Label(8,0,"所在城市",format1);
		   Label labelJ = new Label(9,0,"提交时间",format1);
		   Label labelK = new Label(10,0,"备注",format1);
		   //将定义好的单元格添加到工作表中
		   sheet.addCell(labelA);
		   sheet.addCell(labelB);
		   sheet.addCell(labelC);
		   sheet.addCell(labelD);
		   sheet.addCell(labelE);
		   sheet.addCell(labelF);
		   sheet.addCell(labelG);
		   sheet.addCell(labelH);
		   sheet.addCell(labelI);
		   sheet.addCell(labelJ);
		   sheet.addCell(labelK);
		   for (int ii = 0; ii < result.size(); ii++) {
			   SubApplyInfos vo = (SubApplyInfos)result.get(ii);
			   Label labelA1 = new Label(0,ii+1,vo.getApplyType());
			   Label labelB1 = new Label(1,ii+1,vo.getApplyTitle());
			   Label labelC1 = new Label(2,ii+1,vo.getApplyName());
			   Label labelD1 = new Label(3,ii+1,vo.getApplySex());
			   Label labelE1 = new Label(4,ii+1,vo.getApplyTel());
			   Label labelF1 = new Label(5,ii+1,vo.getApplyCar());
			   Label labelG1 = new Label(6,ii+1,vo.getApplyTime());
			   Label labelH1 = new Label(7,ii+1,vo.getApplyEmail());
			   Label labelI1 = new Label(8,ii+1,vo.getApplyCity());
			   SimpleDateFormat f1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			   Label labelJ1 = null;
			   if(vo.getCreateTime() != null && !"".equals(vo.getCreateTime())){
				   labelJ1 = new Label(9,ii+1,f1.format(vo.getCreateTime()));
			   }else{
				   labelJ1 = new Label(9,ii+1,"");
			   }
			   
			   Label labelK1 = new Label(10,ii+1,vo.getApplyRemark()); 
			   
			   sheet.addCell(labelA1);
			   sheet.addCell(labelB1);
			   sheet.addCell(labelC1);
			   sheet.addCell(labelD1);
			   sheet.addCell(labelE1);
			   sheet.addCell(labelF1);
			   sheet.addCell(labelG1);
			   sheet.addCell(labelH1);
			   sheet.addCell(labelI1);
			   sheet.addCell(labelJ1);
			   sheet.addCell(labelK1);
		   }
		   //写入数据并关闭文件
		   book.write();
		   book.close();
		   System.out.println("创建文件成功!");
                   os.close();
}