springmvc导出excel(POI)

/**
     * 导出excel表格    
     */
    @RequestMapping(value = "/doExportData", method = {RequestMethod.POST, RequestMethod.GET})
    public void doExportUserData(HttpServletRequest request, HttpServletResponse response,ModelMap modelMap){    	
    	String enddate = (String) request.getParameter("enddate");      
        //查询数据列表
        List<User> userList =  aService.findByDate(enddate);
        	
    	// 生成提示信息，  
        response.setContentType("application/vnd.ms-excel");  

        try{              
        	//拼凑文件名称：时间+随机数
　　　　　　　　　String fileName = "" ;
        	String[] date2 = enddate.split("-");
        	for(int i=0;i<date2.length;i++){
        		fileName = fileName+date2[i];
        	}
                //方法二：
　　　　　　　　　//String fileName = enddate.replace("-", "");
        	fileName = fileName+Math.round(Math.random()*10000);//添加随机数
            response.setHeader("content-disposition", "attachment;filename=" + fileName + ".xls");  
            // 产生工作簿对象  
            HSSFWorkbook workbook = new HSSFWorkbook();  
            //产生工作表对象           
            HSSFSheet sheet = workbook.createSheet("用户列表");  //设置sheet页名称     
            HSSFRow row = sheet.createRow(0);            
            HSSFCellStyle style = workbook.createCellStyle();
            style.setAlignment(CellStyle.ALIGN_CENTER); // 创建一个居中格式
            HSSFCell cell = row.createCell(0);
            cell.setCellValue("部门名称");
            cell.setCellStyle(style);
            cell = row.createCell(1);
            cell.setCellValue("工号");
            cell.setCellStyle(style);
            cell = row.createCell(2);
            cell.setCellValue("姓名");
            cell.setCellStyle(style);
            cell = row.createCell(3);
            cell.setCellValue("时间");
            cell.setCellStyle(style);
            
            //循环数据
            for (int i = 0; i < userList.size(); i++){  
            	row = sheet.createRow(i + 1);
                User user = userList.get(i);
                //创建单元格，并设置值
                row.createCell(0).setCellValue(user.getDeptName());
                row.createCell(1).setCellValue(user.getUserid());
                row.createCell(2).setCellValue(user.getName());
                row.createCell(3).setCellValue(enddate);
            }  
            //文件导出路径，项目中的exportfile文件下           
            String path = request.getSession().getServletContext()
    				.getRealPath("/");  
            String filePath =path+"exportfile\\"+fileName+".xls";            
            OutputStream os = new FileOutputStream(filePath);
            workbook.write(os);
            os.close();   
            
            //下载文件(只是导出到了相应的文件下面，下载中没有，不添加此方法，在谷歌浏览器中不能直接可以打开文件，提示保存文件名称不一致，打开是空的)
            File templateFile = new File(filePath);
            FileUtil.downloadFile(response, templateFile);
        }catch (Exception e){
        	e.printStackTrace();
        }
    }     

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.StringUtils;

/**
 * 文件工具类
 */
public class FileUtil {

	/**
	 * 下载文件
	 * 
	 * @param response
	 * @param file
	 * @throws Exception
	 */
	public static void downloadFile(HttpServletResponse response, File file)
			throws Exception {

		if (null == response || null == file)
			return;

		InputStream is = null;
		OutputStream os = null;

		if (file.exists()) {
			// 2 文件名称
			String fileName = getFileNameByCompleteFilePath(file.getName());
			// 3 文件大小
			String fileLength = String.valueOf(file.length());
			// 4 下载文件名称
			String realDownLoadFileName = new String(fileName.getBytes(),
					"8859_1");
			// 5 设置响应参数
			response.reset();
			response.setContentType("application/x-msdownload;");
			response.setHeader("Content-disposition", "attachment; filename="
					+ realDownLoadFileName);
			response.setHeader("Content-Length", fileLength);
			response.setHeader("Cache-Control",
					"must-revalidate, post-check=0, pre-check=0");
			response.setHeader("Pragma", "public");
			response.setDateHeader("Expires",
					System.currentTimeMillis() + 1000L);
			try {
				is = new BufferedInputStream(new FileInputStream(file));
				os = new BufferedOutputStream(response.getOutputStream());
				byte[] buffer = new byte[1024];
				while (true) {

					int size = is.read(buffer, 0, 1024);
					if (size == -1) {

						break;
					}
					os.write(buffer, 0, size);
				}

			} catch (Exception e) {
				e.printStackTrace();
			} finally {
				try {
					if (is != null) {
						is.close();
					}
				} catch (IOException e) {

					e.printStackTrace();
				}
				try {
					if (os != null) {
						os.close();
					}
				} catch (IOException e) {

					e.printStackTrace();
				}
			}
			response.setStatus(HttpServletResponse.SC_OK);
			try {

				response.flushBuffer();

			} catch (IOException e) {

			}
		} else {
			// System.out.println("下载文件不存在,文件路径: " + file.getAbsolutePath());
			// 如果文件不存在，则创建异常对象并向上抛出
			throw new Exception();
		}
	}
	
	public static String getFileNameByCompleteFilePath(String path) {

		if (StringUtils.isBlank(path))
			return "";
		// 1 转化路径为本地串
		path = toLocalPath(path);
		// 2 处理
		if (StringUtils.isNotBlank(path)) {
			int index = path.lastIndexOf(File.separator);
			return path = path.substring(index + 1);
		}
		return "";
	}
	
	public static final String toLocalPath(String pathString) {

		if (StringUtils.isBlank(pathString))
			return "";
		pathString = replace(pathString, "/", File.separator);
		pathString = replace(pathString, "\\", File.separator);
		return pathString;
	}
	public static final String replace(String line, String oldString,
			String newString) {

		// 递归算法
		int i = 0;
		if ((i = line.indexOf(oldString, i)) >= 0) {
			char[] line2 = line.toCharArray();
			char[] newString2 = newString.toCharArray();
			int oLength = oldString.length();
			StringBuffer buf = new StringBuffer(line2.length);
			buf.append(line2, 0, i).append(newString2);
			i += oLength;
			int j = i;
			while ((i = line.indexOf(oldString, i)) > 0) {
				buf.append(line2, j, i - j).append(newString2);
				i += oLength;
				j = i;
			}
			buf.append(line2, j, line2.length - j);
			return buf.toString();
		}
		return line;
	}
	
}