spring上传下载文件

不使用第三方上传和下载。

上传文件：@RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
public void uploadFile(HttpServletRequest request) {

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
Map<String, MultipartFile> fileMap = multipartRequest.getFileMap();
String path = File.separator + "Files";
String realPath = request.getSession().getServletContext().getRealPath(path);
String fileName;
String fileType;
MultipartFile mf;
File uploadFile;
for (Map.Entry<String, MultipartFile> entity : fileMap.entrySet()) {
mf= entity.getValue();
fileName = mf.getOriginalFilename();
fileType= fileName.substring(fileName.lastIndexOf(".") + 1);
String filePath = fileName + "." + fileType;
uploadFile = new File(realPath + File.separator + filePath);
try {
mf.transferTo(uploadFile);
}catch (Exception e)
{
e.printStackTrace();
}
}

}上面是获取所有上传文件，也可以获取指定名称的文件

MultipartFile userImg = multipartRequest.getFile("paramName");

下载文件：

@RequestMapping("/download")
public void downloadFile(String fileName,HttpServletResponse response){
response.setCharacterEncoding("utf-8");
response.setContentType("multipart/form-data");
response.setHeader("Content-Disposition", "attachment;fileName="+fileName);
try {
File file=new File(fileName);
InputStream inputStream=new FileInputStream("file/"+file);
OutputStream os=response.getOutputStream();
byte[] b=new byte[1024];
int length;
while((length=inputStream.read(b))>0){
os.write(b,0,length);
}
inputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}