首先需要引入commons-fileupload

commons-fileupload

commons-fileupload

1.3.3

MultipartFile方式

示例代码：

@RequestMapping(value = "", method = RequestMethod.POST)

@ResponseBody

public String postUpload(HttpServletRequest request, MultipartFile file) throws Exception

{

String path = request.getSession().getServletContext().getRealPath("upload");

String fileName = file.getOriginalFilename();

File dir = new File(path, fileName);

if (!dir.exists()) {

dir.mkdirs();

}

file.transferTo(dir);

return "ok";

}

CommonsMultipartFile方式

示例代码：

@RequestMapping(value = "", method = RequestMethod.POST)

@ResponseBody

public String postUpload(@RequestParam(required = false) CommonsMultipartFile file, HttpServletRequest request) throws Exception

{

String path = request.getSession().getServletContext().getRealPath("upload");

String fileName = file.getOriginalFilename();

File dir = new File(path);

if (!dir.exists()) {

dir.mkdirs();

}

OutputStream os = new FileOutputStream(dir + "/" + fileName);

InputStream ins = file.getInputStream();

byte[] bytes = new byte[1024];

int temp;

while ((temp = ins.read(bytes)) != -1) {

os.write(bytes, 0, temp);

}

os.close();

ins.close();

return "ok";

}

CommonsMultipartResolver方式

示例代码：

@RequestMapping(value = "", method = RequestMethod.POST)

@ResponseBody

public String postUpload(HttpServletRequest request) throws Exception

{

CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(

request.getSession().getServletContext()

);

if (commonsMultipartResolver.isMultipart(request)) {

MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest)request;

MultipartFile file = multipartHttpServletRequest.getFile("file");

String path = request.getSession().getServletContext().getRealPath("upload");

String fileName = file.getOriginalFilename();

File dir = new File(path, fileName);

if (!dir.exists()) {

dir.mkdirs();

}

file.transferTo(dir);

}

return "ok";

}