JSP获取参数问题

我有一个表单，如果计时器到达，表单会自动重定向到Servlet来更新数据库。我现在的问题是，如果javascript将窗口重定向到servlet，那么我的request.getParameter为null

function verify(f,whichCase){
if(whichCase == "Submit"){
    msg = "Are you sure that you want to submit this test?";
    var i = confirm(msg)
    if(i){
        parent.window.location = "sindex.jsp"
    }
   return i;
 }
}

我这样做是因为我的jsp中有一个iframe。计时器更新问题必须使用iframe。所以，当时间到或用户单击submit parent.window.location时，可以让我刷新父窗口

<form method="POST" action="${pageContext.request.contextPath}/TestServlet" onSubmit="return verify(this,whichPressed)">

下面是time up重定向到TestServlet触发doGet方法时的计时器

if((mins == 0) && (secs == 0)) {
window.alert("Time is up. Press OK to submit the test."); // change timeout message as required
var sUrl = "TestServlet";
parent.window.location = sUrl // redirects to specified page once timer ends and ok button is pressed
} else {
  cd = setTimeout("redo()",1000);
}

---

我不确定我是否理解这个问题，但我认为你的问题在这里：

if((mins == 0) && (secs == 0)) {
window.alert("Time is up. Press OK to submit the test."); // change timeout message as required
var sUrl = "TestServlet";
parent.window.location = sUrl // redirects to specified page once timer ends and ok button is pressed
} else {
  cd = setTimeout("redo()",1000);
}

您正在重定向到TestServlet，但没有发送任何参数，因为您没有提交表单。试着这样做：

    if((mins == 0) && (secs == 0)) {
    window.alert("Time is up. Press OK to submit the test."); // change timeout message as required
    var sUrl = "TestServlet";
    //myform it's a variable pointing to your form
    myform.submit();
    } else {
      cd = setTimeout("redo()",1000);
    }

---

希望这有帮助

您好，因为该表单位于iframe中

    if((mins == 0) && (secs == 0)) {
    window.alert("Time is up. Press OK to submit the test."); // change timeout message as required
    var sUrl = "TestServlet";
    //myform it's a variable pointing to your form
    myform.submit();
    } else {
      cd = setTimeout("redo()",1000);
    }