文件的上传（可以上传照片，word文档，等单个文件）

jsp:
jsp页面：
<LINK href="${basePath}plugins/uploadify/uploadify.css" type="text/css" rel="stylesheet" />
<script language="javascript" type="text/javascript">
    //防止客户端缓存文件，造成uploadify.js不更新，而引起的“喔唷，崩溃啦”  
    document.write ("<script type='text/javascript' " + "src='${basePath}plugins/uploadify/jquery.uploadify.min.js?" + new Date () + "'><\/script>");
</script>
<style>
.uploadify-box {
    width: 130px;
    margin: 0px;
    margin-top: 10px;
}
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@taglib prefix="f" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>

<script type="text/javascript">

<script type="text/javascript">
$(function() {
//文件上传
    $('.uploadFile').each(function(){
        var id=    $(this).attr("id");
        var $this = $(this);
        $("#"+id).uploadify({
            buttonClass:'',
            fileSizeLimit: '20480KB',
            uploader: '${basePath}core/upload!uploadFile.action',// 服务器端处理地址
            swf: '${basePath}js/uploadify/uploadify.swf',// 上传使用的 Flash
            buttonText: "上传文档", 
            buttonCursor: 'hand',
            fileObjName: 'uploadify',// 上传参数名称 后台action里面的属性uploadify
            fileTypeExts: "*.jpg;*.png;*.gif;*.pdf;*.doc;*.docx", // 扩展名
            fileTypeDesc: "请选择 文件格式",
            removeTimeout:1, // 文件说明
            auto: true,// 选择之后，自动开始上传
            multi: false, // 是否支持同时上传多个文件
            queueSizeLimit: 1,// 允许多文件上传的时候，同时上传文件的个数
            queueID:'queueID',
            
            onUploadSuccess:function(file, data, response){
                var data =jQuery.parseJSON(data);
                if(data.error == 1){
                    ldDialog.alert(data.message);
                }else{
                    $("#filePath").val(data.url);
                    $("#fileName").val(data.fileName);
                    $("#userFileName").html(data.fileName);
                }
            }
        });
    });
});
</script>

    @RequestMapping("core/upload!uploadFile.action")
    public void uploadFile(@RequestParam(value = "uploadify", required = false) MultipartFile uploadify,HttpServletRequest request,HttpServletResponse response,ModelMap modelMap) throws Exception {

        @SuppressWarnings("deprecation")
        String savePath = request.getRealPath("/")+ "/" + "upload/";
        String saveUrl = "upload/";
        HashMap<String, String> extMap = new HashMap<String, String>();
        extMap.put("file", "pdf,rar,zip,7z,gif,jpg,jpeg,png,bmp,doc,docx,xlsx,xls");
        //extMap.put("image", "gif,jpg,jpeg,png,bmp");
        extMap.put("csv", "csv");
         int uploadMaxSize =Integer.valueOf(optionService.getByOptionName(CoreValue.OPTION_UPLOAD_MAX_SIZE).getOptionValue());
        long maxSize = Long.valueOf(String.valueOf(uploadMaxSize)).longValue();
        String maxSizeKb = StringUtil.formatNumber(new Double(maxSize / 1024L),"0");
        response.setContentType("text/html; charset=UTF-8");
        String jsonString = "";
        if (!ServletFileUpload.isMultipartContent(getRequest())) {
            jsonString = getError("请选择文件。");
            response.getWriter().println(jsonString);
            return;
        }

        File uploadDir = new File(savePath);
        if (!uploadDir.isDirectory()) {
            jsonString = getError(savePath + "上传目录不存在。");
            response.getWriter().println(jsonString);
            return;
        }

        if (!uploadDir.canWrite()) {
            jsonString = getError("上传目录没有写权限。");
            response.getWriter().println(jsonString);
            return;
        }

        String dirName = getRequest().getParameter("dir");
        if (dirName == null) {
            dirName = "file";
        }
        if (!extMap.containsKey(dirName)) {
            jsonString = getError("目录名不正确。");
            response.getWriter().println(jsonString);
            return;
        }

        savePath = savePath + dirName + "/";
        saveUrl = saveUrl + dirName + "/";
        File saveDirFile = new File(savePath);
        if (!saveDirFile.exists()) {
            saveDirFile.mkdirs();
        }
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
        String ymd = sdf.format(new Date());
        savePath = savePath + ymd + "/";
        saveUrl = saveUrl + ymd + "/";
        File dirFile = new File(savePath);

        if (!dirFile.exists()) {
            dirFile.mkdirs();
        }

        String fileName = uploadify.getOriginalFilename();
        long fileSize = uploadify.getSize();
        if (fileSize > maxSize) {
            jsonString = getError("上传文件大小超过限制。最大为" + maxSizeKb + "kb");
            response.getWriter().println(jsonString);
            return;
        }

        String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
            
        if (!Arrays.asList(((String) extMap.get(dirName)).split(",")).contains(fileExt)) {
            jsonString = getError("不允许的上传文件类型。");
            response.getWriter().println(jsonString);
            return;
        }

        SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
        String newFileName = df.format(new Date()) + "_"+ new Random().nextInt(1000) + "." + fileExt;
        File uploadedFile = null;
        try {
            uploadedFile = new File(savePath, newFileName);
            if(uploadedFile.exists()){
                
            }
            if(!uploadedFile.exists()){
                uploadedFile.mkdirs();
            }
            uploadify.transferTo(uploadedFile);
        } catch (Exception e) {
            jsonString = getError("上传文件失败。");
            response.getWriter().println(jsonString);
            return;
        }
        JSONObject obj = new JSONObject();
        obj.put("error", Integer.valueOf(0));
        obj.put("url", saveUrl + newFileName);
        obj.put("newFileName", newFileName);
        obj.put("fileName", fileName);
        jsonString = obj.toJSONString();
        response.getWriter().println(jsonString);
    }

    private String getError(String message) {
        JSONObject obj = new JSONObject();
        obj.put("error", Integer.valueOf(1));
        obj.put("message", message);
        return obj.toJSONString();
    }