java文件上传方式1servlet 方式2springmvc

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf-8");
		response.setContentType("text/html,charset=utf-8");
		Boolean ismu=ServletFileUpload.isMultipartContent(request);
		if(ismu) {
			FileItemFactory ff=new DiskFileItemFactory();
			ServletFileUpload sUpload=new ServletFileUpload(ff);
　　　　　　　　　　　　　　sUpload.setFileSizeMax(1024*2);//限制上传文件大小
			try {
				List<FileItem> gg=sUpload.parseRequest(request);
				Iterator<FileItem> jj=gg.iterator();
				int jk=1;
				while(jj.hasNext()) {
					FileItem hh=jj.next();
					if((hh.getFieldName()).equals("file")) {
						String filename=hh.getName();
						String path=request.getSession().getServletContext().getRealPath("uploadone");
						File file=new File(path,filename);
						hh.write(file);
					}else if((hh.getFieldName()).equals("name")) {
						jk=Integer.parseInt(hh.getString());
						System.out.print(jk);
					}
				}

			} catch (FileUploadException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
	}

注意：将两个jar包放入项目webcontent/WEB-INF/lib中【commons-fileupload-1.3.1、commons-io-2.4】
     在webcontent中新建一个存放文件的目录
。
springmvc：
    @RequestMapping(value="onemvc12",method=RequestMethod.POST)
    public String test_upload(@RequestParam("id") Integer id,@RequestParam("upload") MultipartFile mf) throws IOException {

    System.out.println(id);
    InputStream in=mf.getInputStream();
    String name=mf.getOriginalFilename();
    OutputStream out1=new FileOutputStream("D:\\"+name);
    byte[] byte1=new byte[1024];
    int len=-1;
    while ((len=in.read(byte1)) != -1) {
        out1.write(byte1,0,len);
    }
    in.close();
    out1.close();
    return "ok";
    }
<!-- 实现springmvc文件上传下载 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

<property name="defaultEncoding" value="UTF-8"></property>
<property name="maxUploadSize" value="102400"></property>

</bean>