SSM excel文件的导入导出

<!-- html -->

<!-- excel文件导出 -->
<p><a href="${pageContext.request.contextPath}/user/exportExcel">导出</a>
<!-- excel文件导入 -->
<form action="${pageContext.request.contextPath}/user/importExcel" method="post" enctype="multipart/form-data">
	<input type="file" name="userExcel" />
	<input type="submit" value="导入">
</form>

//控制层
//导出excel文档
	@RequestMapping("/exportExcel")
	@ResponseBody
	public void exportExcel(HttpServletRequest request,HttpServletResponse response){
		try {
			//获取数据源
			List<User> userList = userService.queryUserAll();
			
			//导出excel
			response.setHeader("Content-Disposition","attachment;filename="+new String("用户信息.xls".getBytes(),"ISO-8859-1"));
			response.setContentType("application/x-excel;charset=UTF-8");
			OutputStream outputStream = response.getOutputStream();
			//导出
			userService.exportExcel(userList,outputStream);
			outputStream.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

//导入
	@RequestMapping("/importExcel")
	//@ResponseBody
	public String importExcel(MultipartFile userExcel,HttpServletRequest request,HttpSession session){
		if(userExcel == null){
			session.setAttribute("excelName", "未上传文件，上传失败！");
			return "redirect:queryUserAll";
		}
		String userExcelFileName = userExcel.getOriginalFilename();
		if(!userExcelFileName.matches("^.+\\.(?i)((xls)|(xlsx))$")){
			session.setAttribute("excelName", "文件格式不正确！请使用.xls或.xlsx后缀的文档，导入失败！");
			return "redirect:queryUserAll";
		}
		//导入
		try {
			userService.importExcel(userExcel);
		} catch (IOException | InvalidFormatException e) {
			e.printStackTrace();
		}
		session.setAttribute("excelName", "导入成功！");
		return "redirect:queryUserAll";
	}

//service层
//导出
@Override
	public void exportExcel(List<User> userList, OutputStream outputStream) throws IOException {
		//1.创建工作簿
		HSSFWorkbook hwb =new HSSFWorkbook();
		//1.1创建合并单元格
		//CellRangeAddress cellRangeAddress =new CellRangeAddress(0,0,0,4);
		//2.创建工作表
		HSSFSheet sheet = hwb.createSheet("用户信息表");
		//2.1添加合并单元格
		//sheet.addMergedRegion(cellRangeAddress);
		//3.1创建第一行及单元格
		HSSFRow row1 = sheet.createRow(0);
		HSSFCell cell1 = row1.createCell(0);
		cell1.setCellValue("用户信息");
		//3.2创建第二行及单元格
		HSSFRow row2 = sheet.createRow(1);
		String[] row2Cell = {"编号","姓名","性别","年龄","部门名称"};
		for (int i =0 ; i < row2Cell.length ; i++ ){
			row2.createCell(i).setCellValue(row2Cell[i]);
		}
		//3.3创建第三行及单元格
		if(userList!= null && userList.size()>0){
			for(int j=0 ; j<userList.size() ;j++){
				HSSFRow rowUser = sheet.createRow(j+2);
				rowUser.createCell(0).setCellValue(userList.get(j).getId());
				rowUser.createCell(1).setCellValue(userList.get(j).getName());
				rowUser.createCell(2).setCellValue(userList.get(j).getSex());
				rowUser.createCell(3).setCellValue(userList.get(j).getAge());
				//rowUser.createCell(4).setCellValue(userList.get(j).getId());
			}
		}
		//5.输出
		hwb.write(outputStream);
	}

//导入
@Override
	public void importExcel(MultipartFile userExcel) throws IOException, InvalidFormatException {
		//获取输入流
		InputStream inputStream = userExcel.getInputStream();
		//创建读取工作簿
		Workbook workbook = WorkbookFactory.create(inputStream);
		//获取工作表
		Sheet sheet = workbook.getSheetAt(0);
		//获取总行
		int rows=sheet.getPhysicalNumberOfRows();
		if(rows>2){
			//获取单元格
			for (int i = 2; i < rows; i++) {
				Row row = sheet.getRow(i);
				User user =new User();
				
				try {
					String id = row.getCell(0).getStringCellValue();
					user.setId(Integer.parseInt(id));
				} catch (IllegalStateException e) {
					int id=(int)row.getCell(0).getNumericCellValue();
					user.setId(id);
				}
				
				String name = row.getCell(1).getStringCellValue();
				user.setName(name);
				
				String sex = row.getCell(2).getStringCellValue();
				user.setSex(sex);
				
				try {
					String age = row.getCell(3).getStringCellValue();
					user.setAge(Integer.parseInt(age));
				} catch (IllegalStateException e) {
					int age=(int)row.getCell(3).getNumericCellValue();
					user.setAge(age);
				}
				//想数据库中添加新对象
				addUser(user);//方法
			}
			
		}
		
		inputStream.close();
	}