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;
}

}