<form name="articleform" class="form-horizontal" action="${pageContext.request.contextPath}/list"
                  method="post" enctype="multipart/form-data">
                <input type="text" name="id" />
                <input type="file" name="image" size="100"
　　　　　　　　　 <input type="submit" value="提交" />
</form>

 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        request.setCharacterEncoding("UTF-8");
        try {
            SmartUpload su=new SmartUpload();
//初始化SmartUpload ,必须有要，不然有异常
            su.initialize(this.getServletConfig(),request,response);
            su.setMaxFileSize(1*1024*1024);
            su.setTotalMaxFileSize(10*1024*1024);
            su.setAllowedFilesList("jpg,png,JPG");
            su.upload();
//获取其它参数
            String id =su.getRequest.getParameter("id");
//获取文件，如果文件为多个，循环遍历即可
            Files files=su.getFiles();
            String fileName=files.getFile(0).getFileName();
//saveAs方法第二个参数用法可以自己详究一下
            files.getFile(0).saveAs("/resources/images/article/"+fileName,File.SAVEAS_VIRTUAL);
      }
    }