js代码

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$(function() {
	//初始化ajaxForm
	$('#upForm').ajaxForm({
		dataType:'text', 
		type:'POST',
		clearForm:true, // clear all form fields after successful submit
		resetForm:true, // reset the form after successful submit
		beforeSubmit:check,
	    	success:function(data) {
	    		alert(data);
	    	}
	});
	function check(formData, jqForm, options) { 
		//加入一些自定义的验证
		//返回false阻止可以表单提交
	}
});

返回json接收不到，将dataType设置为text

?html

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<form id="upForm" method="POST" enctype="MULTIPART/FORM-DATA" action="saveCommanInfo.action" target="hidden_frame">
	<iframe name='hidden_frame' id="hidden_frame" style='display: none'></iframe>
	<input name="name" id="name"/>
	<input type="file" name="photo" id="photo"/>
	<input type="submit" value="提交表单"/>
</form>

?Action

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public String save() throws Exception {
	//处理上传
	try {
		..........
		String ajaxResult="上传成功！";
		//将提示信息返回前台
		response.setContentType("text/html; charset=utf-8");
		response.setHeader("Cache-Control", "no-cache");
		PrintWriter out = response.getWriter();
		out.write("<script>alert('"+ajaxResult+"')</script>");
		out.flush();
		out.close();
	} catch (Exception e) {
		e.printStackTrace();
		throw new GlobalException(e);
	}
	// 不做跳转，返回none，返回null也可以
	return NONE;
}

?Action配置

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<package name="system" extends="json-default">
	<action name="save" class="systemAction" method="save">
		<result type="json">
		  <!-- 返回html文本 -->
		  <param name="contentType">text/html</param>
		  <!-- 返回的提示信息 -->
		  <param name="root">ajaxResult</param>
		</result>
	</action>
</package>

?注意要继承json-default，页面上要引入jquery和jquery.form

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