jstl获得js值

<input type="hidden" id="hiddenField" name="hiddenField">
<script>
    var jsValue = "someValue";
    document.getElementById("hiddenField").value = jsValue;
</script>

<form action="yourServlet" method="post">
    <!-- 其他表单字段 -->
    <input type="submit" value="Submit">
</form>

var jsValue = "someValue";
fetch('yourServlet', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({ value: jsValue })
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String jsValue = request.getParameter("value");
    // 处理jsValue
}

var jsValue = "someValue";
window.location.href = "yourServlet?value=" + encodeURIComponent(jsValue);

<%
    String jsValue = request.getParameter("value");
    // 处理jsValue
%>