jquer ajax 提交表单
<script src="<%=request.getContextPath() %>/js/jquery-1.7.2.min.js" type="text/javascript"></script>
<script src ="<%=request.getContextPath() %>/js/jquery.form.js" type ="text/javascript" ></script>
<script type="text/javascript">
$(document).ready(function()
{
$('#form1').submit(function()//提交表单
{
//alert("ddd");
var options = {
url:'<%=request.getContextPath() %>/stu.do?method=jqueryajax', //提交给哪个执行
type:'POST',
success: function(data){
alert(data);
} //显示操作提示
};
$('#form1').ajaxSubmit(options);
return false; //为了不刷新页面,返回false，反正都已经在后台执行完了，没事！

});
}
);
</script>

struts1后台：tishi = "123";
PrintWriter pw=response.getWriter();
pw.print(tishi);
pw.close();

return null;

struts2后台：tishi = "1";
response.getWriter().write(tishi);

return mapping.findForward("addPage");