springmvc 实现文件上传

1。添加jar包

<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>

2.

@ResponseBody
	@RequestMapping("upfile")
	public void upfile(@RequestParam("file")MultipartFile  req) throws Exception {
		InputStream  is=req.getInputStream();
		byte[] buff=new byte[1024*4];
		String filename=req.getOriginalFilename();
		FileOutputStream  fos=new FileOutputStream("d:\\"+filename);
		int len=0;
		while((len=is.read(buff))>0) {
			fos.write(buff, 0, len);
		}
		fos.close();
		is.close();
	}