java利用iframe实现form表单上传文件并返回结果

转： http://www.iteye.com/topic/81120

通过form表单提交,实现文件上传,并不刷新页面返回参数(成功,或失败);

实现这一功能最重要的两点,1iframe 2.target

target: 属性规定在何处打开 action URL。

功能代码实现:

前台部分:

<html:form styleId="form" action="/policy/sslvpn/back.do?method=importFile" enctype="multipart/form-data" target="hframe" onsubmit="return checkSystemInfo();">
	<div class="error-tip"></div>
		<div id="wrapper">
		<fieldset class="form-container" style="height: 80px">
			<legend>策略导入</legend>
				<div align="center">
					<html:file property="theFile"></html:file>
					<input type="submit" value="确定"><span id="msg"></span>
				</div>
		</fieldset>
	</div>
	<iframe name ="hframe" id="hframe" style=" display: none" ></iframe >
</html:form>

前台jQuery:

function callback(msg){  
    jQuery("#msg").html("<font color=red>"+msg+"</font>");
}  

注:前台页面我用的是Struts标签,至于使用什么标签是无所谓的; 前台页面代码最主要的是iframe标签,和form标签中的target属性,iframe标签的name属性要和form表单中的

target属性的值相同

js的 callback 方法是回调方法

后台代码:

	public ActionForward importFile(ActionMapping mapping,ActionForm form,
			HttpServletRequest request,HttpServletResponse response)
					throws Exception {
		HttpSession session = request.getSession();
		UserObject user = AuthorityControl.getUser(session);
		ServletContext servletContext = session.getServletContext();
		
		BackFileManager manager = new BackFileManager(user);
		UploadForm uploadForm = (UploadForm)form;
		
		FormFile theFile = uploadForm.getTheFile();
		String fileName = theFile.getFileName();
		String uploadPath = servletContext.getRealPath("/upload");
		InputStream inputStream = theFile.getInputStream();
		
		File file = createFileFromInputStream(fileName, inputStream, uploadPath);
		String result = manager.importFile(file);
		String msg ="";
		if(result!=null&&result!=""){
			msg =result;
		}else{
			msg="导入成功!";
		}
		response.setContentType("text/html;charset=utf-8");
		response.getWriter().print("<script type='text/javascript'>parent.callback('"+msg+"')</script>");
		response.getWriter().flush();
		response.getWriter().close();
		return null;
	}