定时刷新和跳转和停止

@Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        try {
            testPay();
            resp.getWriter().write("ok,查看控制台");
//            Thread.sleep(3000);停三秒
//            resp.sendRedirect("http://localhost:8080/");
            //设置3秒钟跳转
            resp.setHeader("refresh", "3;url=http://localhost:8080/");
        } catch (Exception e) {
            e.printStackTrace();
            resp.getWriter().write("error");
            resp.setHeader("refresh", "3;url=http://localhost:8080/");
        }

//第二种方式，设置request的属性定时跳转
    private void test2(HttpServletRequest request,HttpServletResponse response){
        String meta="<meta http-equiv=‘Refresh‘ content=‘3;url=/web2/show.jsp‘>";
        request.setAttribute("meta", meta);
        try {
            request.getRequestDispatcher("/main.jsp").forward(request, response);
        } catch (ServletException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

<span style="font-size:18px;"> </span>
<span style="font-size:24px;">
<meta http-equiv="refresh" content="3;URL=res.html"> 
</span> 
<span style="font-size:24px;">//3秒之后自动跳转到res.html，两个属于同一文件下面，要是需要跳转到jsp页面，
就需要在url里面填写url地址————（浏览器的地址栏里面写入的数据，如：http://localhost:8080/TestDemo/1.jsp）</span> 

<script type="text/javascript"> 
onload=function(){ <span style="white-space:pre"> </span>//在进入网页的时候加载该方法 
setTimeout(go, 3000); <span style="white-space:pre"> </span> /*在js中是ms的单位*/ 
}; 
function go(){ 
location.href="http://localhost:8080/TestDemo/index.jsp"; 
} 
</script> 
//3秒之后自动执行go方法，直接跳转到index.jsp页面 

<script type="text/javascript"> 
onload=function(){ 
setInterval(go, 1000); 
}; 
var x=3; //利用了全局变量来执行 
function go(){ 
x--; 
if(x>0){ 
document.getElementById("sp").innerHTML=x; //每次设置的x的值都不一样了。 
}else{ 
location.href=‘res.html‘; 
} 
} 
</script>