一直以为ajax不能做上传,直到最近看了一些文章。需要引入AjaxFileUploaderV2.1.zip,下载链接:http://pan.baidu.com/s/1i3L7I2T

　 代码和相关配置如下：

   js代码：

　　　　　　

需要导入jquery星河ajaxfileupload.js,html代码：

     
            
      
                
                                   选择文件(*.xls格式)：                 
                   
      
            
              
     

struts2 配置：

             
                  
                   
       uploadTemp        
          
     

后端struts2 action代码：

// 上传文件所需属性    private String title;    private File uploadFile;    private String uploadFileContentType;    private String SavePath;    private String uploadFileFileName;    Log log = LogFactory.getLog(this.getClass());public String doUploadAndInsert() throws Exception {        PrintWriter out = null;        MsgBean msg = new MsgBean();        try {            HttpServletResponse response = ServletActionContext.getResponse();            response.setContentType("text/html;charset=utf-8");            out = response.getWriter();            if(getUploadFile().length()>2097152){                msg.setMsgName("SysDefectAction_doDefUploadAndInsert_fail");                msg.setMsgText(getUploadFileFileName()+"上传失败,文件太大。\r\n请不要上传超过2048KB的文件");                out.write(JSON.toJSONString(msg));                out.flush();                return null;            }            //后缀名限制            String suffixName = getUploadFileFileName().split("\\.")[1];            if(!"xls".equalsIgnoreCase(suffixName)){                msg.setMsgName("SysDefectAction_doDefUploadAndInsert_fail");                msg.setMsgText(getUploadFileFileName()+"上传失败,错误的文件格式!");                out.write(JSON.toJSONString(msg));                out.flush();                return null;            }            UUID uuid = UUID.randomUUID();            ServletContext servletContext = (ServletContext) ActionContext.getContext().get(ServletActionContext.SERVLET_CONTEXT);            String rootPath = servletContext.getRealPath("/");            File folder = new File(rootPath + "\\" + getSavePath());            if (!folder.exists()) {                folder.mkdir();            }            FileOutputStream fileOutputStream = new FileOutputStream(rootPath + "\\" + getSavePath() + "\\" + uuid+"_"+getUploadFileFileName());            FileInputStream fileInputStream = new FileInputStream(getUploadFile());            byte[] buffer = new byte[1024];            int len = 0;            while ((len = fileInputStream.read(buffer)) > 0) {                fileOutputStream.write(buffer, 0, len);            }            fileInputStream.close();            log.info("上传文件接收成功,文件存放全路径为:" + rootPath + "/" + uuid+"_"+getUploadFileFileName());             } catch (Exception e){            msg.setMsgName("SysDefectAction_doDefUploadAndInsert_fail");            msg.setMsgText(getUploadFileFileName()+"上传失败,"+e.getMessage());            out.write(JSON.toJSONString(msg));            out.flush();        } finally{            out.close();            return null;        }    }