如何使用ajax将单选按钮值从一个jsp传递到另一个jsp

<form id="myForm">
  <input type="radio" name="radioBtn" value="option1"> Option 1
  <input type="radio" name="radioBtn" value="option2"> Option 2
  <input type="radio" name="radioBtn" value="option3"> Option 3
  <input type="button" value="Submit" onclick="sendData()">
</form>

function sendData() {
  var selectedValue = document.querySelector('input[name="radioBtn"]:checked').value;
  
  var xhr = new XMLHttpRequest();
  xhr.open("POST", "second.jsp", true);
  xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && xhr.status === 200) {
      // 处理响应
    }
  };
  xhr.send("selectedValue=" + encodeURIComponent(selectedValue));
}

<%
  String selectedValue = request.getParameter("selectedValue");
  // 处理选中的值
%>