Spring MVC 上传文件

Spring 对 Apache Commons FileUpload组件进行了“包装”，包装之后的API超赞！
1.配置MultipartResolver

<bean id="multipartResolver"
       class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- set the max upload size100MB -->
        <property name="maxUploadSize">
        <value>104857600</value>
    </property>
    <property name="maxInMemorySize">
        <value>4096</value>
    </property>
   </bean>

2.继承SimpleFormController，创建文件上传控制器。首先将传来的HttpServletRequest cast成Spring包装好的MultipartHttpServletRequest然后开始向往常一样去传来的参数，对于文件则直接用getFile("fileName")来获得MultipartFile类型，通过调用他的transferTo(File dest)方法存储到指定位置。

public class InfoFormController2 extends SimpleFormController {
	private static Log log = LogFactory.getLog(InfoFormController.class);
	private String uploadDir;
	private InfoDao infoDao;
	private TopicDao topicDao;
	private ProfileService profileService;
	
	public InfoFormController2(){
//		setCommandClass(InfoDTO.class);
		setCommandClass(Info.class);
	}
	
	protected ModelAndView onSubmit(HttpServletRequest request,
			HttpServletResponse response, Object cmd, BindException errors) {

//		InfoDTO bean = (InfoDTO) cmd;
		 Info bean=(Info)cmd;
//		byte[] bytes = bean.getFile();

		// cast to multipart file so we can get additional information
		MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
		String title = multipartRequest.getParameter("title");
		String author= multipartRequest.getParameter("author");
		String content = multipartRequest.getParameter("content");
		String intro = multipartRequest.getParameter("imgIntro");
		String tid = multipartRequest.getParameter("topicId");
		String infoid=multipartRequest.getParameter("infoId");
		String issue=multipartRequest.getParameter("issue");	
		MultipartFile file = multipartRequest.getFile("file");
		MultipartFile video= multipartRequest.getFile("videoFile");
		Info p = new Info();
		if(infoid != null){
			p.setInfoId(Integer.parseInt(infoid));
		}
		p.setContent(content);
		p.setTitle(title);
		p.setAuthor(author);
		p.setImgIntro(intro);
		p.setTopicId(Integer.parseInt(tid));
		p.setPubDate(new java.util.Date());
		if (! issue.isEmpty()){
		p.setIssue(Integer.parseInt(issue));
		}
		if (!file.isEmpty()){
		// String name=file.getOriginalFilename();
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
		String name = sdf.format(new Date()) + ".jpg";
		p.setImgName(name);
//		String uploadDir = this.getUploadDir();
		String uploadDir=getServletContext().getRealPath("/")+ "uploaded";
		File dirPath = new File(uploadDir);
		if (!dirPath.exists()) {
			dirPath.mkdirs();
		}
		String sep = System.getProperty("file.separator");
		File uploadedFile = new File(uploadDir + sep + name);
//		try {
//			FileCopyUtils.copy(bytes, uploadedFile);
//		} catch (IOException e) {
//			// TODO Auto-generated catch block
//			e.printStackTrace();
//		}
		try {
			file.transferTo(uploadedFile);
		} catch (IllegalStateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		log.info("********************************");
		log.info(uploadedFile.getAbsolutePath());
//		log.info(bytes.length);
		log.info("********************************");
		}
		if (!video.isEmpty()){
			String videoName=video.getOriginalFilename();
			p.setVideoName(videoName);
//			String uploadDir = this.getUploadDir();
			String videoDir=getServletContext().getRealPath("/")+ "video";
			File dirPath = new File(videoDir);
			if (!dirPath.exists()) {
				dirPath.mkdirs();
			}
			String sep = System.getProperty("file.separator");
			File videoFile = new File(videoDir + sep + videoName);
			try {
				video.transferTo(videoFile);
			} catch (IllegalStateException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			}		
		infoDao.saveOrUpdate(p);		
		return new ModelAndView(new RedirectView("listInfo.htm?pid=1&topicId="+tid));
	}
	
	protected Map referenceData(HttpServletRequest request) {
//		User u=(User)request.getSession().getAttribute("user");
//		int rid=u.getRoleId();		
//		String hql="from Topic";
//		List<Topic> topics = topicDao.findAllTopics();
//		List<Topic> topics=topicDao.findTopicByCondition(hql);
//		List topics=topicDao.getAll(org.zfzy.model.Topic.class);
		Map map = new HashMap();
		HttpSession sess=request.getSession();
		User u=(User) sess.getAttribute("user");
		List topics=profileService.getTopicsByUser(u.getUserId());
		map.put("topics", topics);
		return map;
	}

	protected void initBinder(HttpServletRequest request,
			ServletRequestDataBinder binder) throws ServletException {
//		binder.registerCustomEditor(byte[].class,
//				new ByteArrayMultipartFileEditor());
	}
	
	public void setInfoDao(InfoDao infoDao) {
		this.infoDao = infoDao;
	}
	public void setTopicDao(TopicDao topicDao) {
		this.topicDao = topicDao;
	}

	public String getUploadDir() {
		return uploadDir;
	}

	public void setUploadDir(String uploadDir) {
		this.uploadDir = uploadDir;
	}
	public void setProfileService(ProfileService profileService) {
		this.profileService = profileService;
	}
	@Override
	protected Object formBackingObject(HttpServletRequest request)
			throws Exception {
		// TODO Auto-generated method stub
//		return super.formBackingObject(request);
		if (request.getParameter("infoId") != null
				&& request.getParameter("infoId").trim().length() > 0) {
			Info i=(Info) infoDao.get(Info.class, Integer.parseInt(request.getParameter("infoId")));
//			InfoDTO dto=new InfoDTO();
			
//			dto.setInfoId(Integer.parseInt(request.getParameter("infoId")));
//			dto.setContent(i.getContent());
//			dto.setImgIntro(i.getImgIntro());
//			dto.setTitle(i.getTitle());
//			dto.setAuthor(i.getAuthor());
//			dto.setIssue(i.getIssue());
//			dto.setTopicId(new Integer(i.getTopicId()).toString());
//			dto.setTopicId(i.getTopicId());
			return i;
			
		}
		return new Info();
	}

}