Strruts2+JQuery上传文件遇到的问题

baining97

使用JQuery的ajaxfileupload上传文件：
js：
function ajaxFileUpload(fileName){if(!btnEnabler){alert("文件上传中，请稍候...");return;}btnEnabler = false;//load the loading image$("#fileLoading").ajaxStart(function(){$(this).show();}).ajaxComplete(function(){$(this).hide();});//file upload$.ajaxFileUpload({ url:'<%=path%>/email/uploadAttach.action?fileName='+escape(escape(fileName)), secureuri:false, fileElementId:'oFile', dataType: 'json', success: function (data, status){allFilePath=allFilePath + data.msg + "<*>";showFile();//clear the file selection dialog boxvar obj = document.getElementById("oFile");obj.outerHTML=obj.outerHTML;  btnEnabler = true;}, error: function (data, status, e){alert("文件上传失败");//clear the file selection dialog boxvar obj = document.getElementById("oFile");obj.outerHTML=obj.outerHTML;  btnEnabler = true;}})} 页面部分：
<input type="file" id="oFile" name="oFile" onchange="ajaxFileUpload(this.value);"><font id="fileLoading" style="display:none"><img src="<%=path%>/resource/image/Emailimage/loading.gif" border="0" align="absmiddle"> 正在上传附件...</font> 后台action：
private static final SimpleDateFormat fileNameSdf=new SimpleDateFormat("yyyyMMddHHmmss");  private File oFile; 提供oFile的get/set方法;
 
public void uploadAttach() throws EmailException {System.out.println("uploadAttach() invoke..." );HttpServletRequest request = ServletActionContext.getRequest();HttpServletResponse response = ServletActionContext.getResponse();    String uploadPath = EmailUtil.getUploadPath();    String fileNamePrefix = fileNameSdf.format(new Date());      String uploadFileName = Escape.unescape(request.getParameter("fileName"));        String storeFileName = uploadPath + fileNamePrefix + uploadFileName;        File storeFile = new File(storeFileName);           BufferedOutputStream bos = null;           BufferedInputStream bis = null;                  try {               bos = new BufferedOutputStream(new FileOutputStream(storeFile));               bis = new BufferedInputStream(new FileInputStream(oFile));               int c;               while ((c = bis.read()) != -1) {                   bos.write(c);                   bos.flush();               }               response.setContentType("text/html;charset=utf-8");            response.getWriter().write("{msg:'"+fileNamePrefix + uploadFileName+"'}");        } catch (IOException e) {               e.printStackTrace();               throw new EmailException("上传邮件附件出错！");        } finally {               try { bos.close(); } catch (IOException e) {e.printStackTrace();}            try { bis.close(); } catch (IOException e) {e.printStackTrace();}        }           } 困惑了半天的问题就是上传小于2M的文件没问题，但是上传大于2M的文件ajax返回error，action没有执行，找了半天是Struts2的default.properties配置文件对上传文件的限制为2M，要修改这个限制可以再struts.xml中修改这一常量
<constant name="struts.multipart.maxSize" value="20000000" /> 问题就搞定了！