<form action="upload.do" method="post" enctype="multipart/form-data">

<input type="file" id="upimage" name="file" onchange="setImagePreview()"/> <input type="submit" value="Submit" /></form>

 import org.apache.commons.io.FileUtils;

 import org.springframework.http.HttpHeaders;

 import org.springframework.http.HttpStatus;

 import org.springframework.http.MediaType;

 import org.springframework.http.ResponseEntity;

 import org.springframework.stereotype.Controller;

 import org.springframework.web.bind.annotation.RequestMapping;

 import org.springframework.web.bind.annotation.RequestParam;

 import org.springframework.web.bind.annotation.ResponseBody;

 import org.springframework.web.multipart.MultipartFile;

 import org.springframework.ui.Model;

 /**

  * {@Controller} spring注解，指定此类为controller

  * {@RequestMapping} 路径

  * @author v_zweiwang

  *

  */

 @Controller

 @RequestMapping("/image")

 public class ImageController {

     @RequestMapping("/toupload")//用于跳转到上传页面

     public String toUpload(){

         return "/WEB-INF/html/upload.html";

     }

     @RequestMapping("/upload")

     public String upload(@RequestParam(value = "file", required = false) MultipartFile file,HttpServletRequest request) {

         SimpleDateFormat dateformat = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss_SS"); //格式化时间

         /**构建图片保存的目录**/

         String upTime =dateformat.format(new Date()); //用于区别保存

         String path=request.getSession().getServletContext().getRealPath("/");//获取项目在服务器的绝对路径file C:....webApp/ =url http://...webApp/ 不明白就打印path

         String fileName = file.getOriginalFilename(); //获得文件名

         String filePath="/upload/"+upTime+"/";//文件相对路径

         File targetFile = new File(path+filePath,fileName); //新建一个文件

         if(!targetFile.exists()){

             targetFile.mkdirs();

         }  

         //保存

         try {

             file.transferTo(targetFile);

         } catch (Exception e) {

             e.printStackTrace();

         }

         System.out.println(request.getContextPath()+filePath+fileName);

         return "redirect:/image/download.do?filepath="+filePath+fileName;//直接重定向下载图片

     }

     @RequestMapping("download")

     public ResponseEntity<byte[]> download(HttpServletRequest request,String filepath) throws IOException {

         String path=request.getSession().getServletContext().getRealPath("/")+filepath;//获取图片路径 filepath为图片相对路径

         System.out.println(path);

             File file=new File(path);

             HttpHeaders headers = new HttpHeaders();

             String fileName=new String("filescan.png".getBytes("UTF-8"),"iso-8859-1");//为了解决中文名称乱码问题

             headers.setContentDispositionFormData("attachment", fileName); //下载后显示的名字

             headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

             return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),

                                               headers, HttpStatus.CREATED);  //向浏览器发送数据

     }

 }