上传图片

引入commons-fileupload-1.2.1.jar和commons-io-1.4.jar架包
<form action="" id="addForm" method="post" enctype="multipart/form-data">

@RequestMapping(value = "/_loaduserphote", method = RequestMethod.POST)
    public void loadUserPhoto(HttpSession session, HttpServletRequest request, HttpServletResponse response) {
    	ResultObj result = new ResultObj();
		result.setCmd("loadUserPhoto");
		StringBuilder sb = new StringBuilder();
		String fileType = request.getParameter("fileType");
		String maxSize = "10";
		String tempPath = request.getSession().getServletContext().getRealPath("/");
		ShopUserObj user = (ShopUserObj)ShopUtil.getSession(session);
		try {
			printHeaders(request);
			if (hasUploadFile(request) && user != null) {
				DiskFileItemFactory factory = new DiskFileItemFactory();
				// 最大缓存
				factory.setSizeThreshold(5 * 1024);
				// 设置临时文件目录
				factory.setRepository(new File(tempPath));
				ServletFileUpload upload = new ServletFileUpload(factory);
				if (maxSize != null && !"".equals(maxSize.trim())) {
					// 文件最大上限
					upload.setSizeMax(Integer.valueOf(maxSize) * 1024 * 1024);
				}
				// 获取所有文件列表
				List<FileItem> items = upload.parseRequest(request);
				for (FileItem item : items) {
					if (!item.isFormField()) {
						// 文件名
						String fileName = item.getName();

						// 检查文件后缀格式
						String fileEnd = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
						if (fileType != null && !"".equals(fileType.trim())) {
							boolean isRealType = false;
							String[] arrType = fileType.split(",");
							for (String str : arrType) {
								if (fileEnd.equals(str.toLowerCase())) {
									isRealType = true;
									break;
								}
							}
							if (!isRealType) {
								// 提示错误信息:文件格式不正确
								// sb.append("{status:'0'}");
							}
						}

						UploadObj obj = new UploadObj();
						obj.setFileNameOld(item.getName());
						obj.setFileSize(item.getSize());
						obj.setFileExt(getFileExt(obj.getFileNameOld()));
						obj.setCreateAt(new Date());
						obj.setCreateBy(user.getId());
						obj.setUpdateAt(obj.getCreateAt());
						obj.setUpdateBy(obj.getCreateBy());
						obj.setUploadPath(DateUtil.getDateTime(obj.getCreateAt(), "yyyy/MM/dd/"));
						obj.setFileName(DateUtil.getDateTime(obj.getCreateAt(), "HHmmss") + StringUtil.getRandomString(5));
						obj.setFileType(getFileType(obj.getFileExt()));
						getImageSize(obj, item);

						StringBuffer path = new StringBuffer();
						path.append(request.getSession().getServletContext().getRealPath("/f")).append("/");
						path.append(obj.getUploadPath()).append(obj.getFileName()).append(".").append(obj.getFileExt());
						// 写入文件
						File file = new File(path.toString());
						if (!file.getParentFile().exists()) {
							file.getParentFile().mkdirs();
						}
						item.write(file);
						boolean flag = shopUserService.doUpdateUserPhoto(session, request, result, obj.getFileName()+"."+obj.getFileExt(), obj);
						if(flag){
							sb.append("{status:'1',id:'").append(obj.getId()).append("',uploadPath:'");
							sb.append(obj.getUploadPath()).append("',fileName:'").append(obj.getFileName()).append("',fileExt:'");
							sb.append(obj.getFileExt()).append("',fileNameOld:'").append(obj.getFileNameOld()).append("',fileSize:'");
							sb.append(obj.getFileSize()).append("',width:'").append(obj.getWidth()).append("',height:'").append(obj.getHeight());
							sb.append("',remark:'").append(StringUtil.getString(obj.getRemark(), "")).append("',tag:'',seq:'0'}");
						}else{
							sb.append("{status:'0'}</script>");
						}
					}
				}
			}
		} catch (Exception e) {
			sb.append("{status:'0'}</script>");
			e.printStackTrace();
		}
		ControllerUtil.doPrint(response, sb, null, ControllerUtil.TYPE_CALLBACK, "Shop");
	}

    public static void printHeaders(HttpServletRequest request) {
		Enumeration<?> en = request.getHeaderNames();
		while (en.hasMoreElements()) {
			String name = (String) en.nextElement();
			System.out.println(name + "={" + request.getHeader(name) + "}");
		}
	}

	public static boolean hasUploadFile(HttpServletRequest request) {
		String contentType = request.getHeader("content-type");
		if (StringUtil.isEmpty(contentType) || contentType.indexOf("multipart/form-data") == -1 || contentType.indexOf("boundary") == -1) {
			return false;
		}
		return true;
	}

	public static String getFileExt(String f) {
		int i = f.lastIndexOf(".");
		if (i != -1) {
			return f.substring(i + 1).toLowerCase();
		}
		return "";
	}

	public static String getFileType(String fileExt) {
		// 图片:1，Word文档:2,压缩文件:3，程序文件:4，文本文件：5，流媒体文件：6，其它文件：7
		String type = "7";
		if ("gif".equals(fileExt) || "jpg".equals(fileExt) || "jpeg".equals(fileExt) || "png".equals(fileExt) || "ico".equals(fileExt) || "bmp".equals(fileExt)) {
			type = "1";
		} else if ("doc".equals(fileExt) || "xls".equals(fileExt) || "docx".equals(fileExt) || "ppt".equals(fileExt)) {
			type = "2";
		} else if ("rar".equals(fileExt) || "zip".equals(fileExt) || "gz".equals(fileExt)) {
			type = "3";
		} else if ("asp".equals(fileExt) || "aspx".equals(fileExt) || "php".equals(fileExt) || "jsp".equals(fileExt) || "cs".equals(fileExt) || "java".equals(fileExt) || "py".equals(fileExt)
				|| "rb".equals(fileExt)) {
			type = "4";
		} else if ("txt".equals(fileExt)) {
			type = "5";
		} else if ("flv".equals(fileExt) || "swf".equals(fileExt) || "avi".equals(fileExt) || "mp3".equals(fileExt)) {
			type = "6";
		}
		return type;
	}

	public static void getImageSize(UploadObj obj, FileItem item) {
		try {

		} catch (Exception e) {
			e.printStackTrace();
		}
	}