java实现excel文件上传

public void fileUpload(MultipartFile file, HttpServletRequest request) {
// 定义临时文件路径
String path1 = request.getSession().getServletContext().getRealPath(new Data());
// 上传excel文件
String path2 = upload(file, path1, "文件名称_" + new Date());
// 读取文件
uploadfile(path2);
}

public String upload(MultipartFile file, String path, String fileName) {
if(file == null || file.getSize() == 0) {
return null;
}
String type = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
File dir = new File(path);
if(!dir.exists()) {
dir.mkdirs();
}
File tempFile = new File(dir + "/" + fileName + type);
FileOutputStream os = null;
try {
os = new FileOutputStream(tempFile);
os.write(file.getBytes());
os.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if(os != null) {
os.close();