js赋值后在jsp中获取

<!-- HTML -->
<form id="myForm" action="yourJspPage.jsp" method="post">
    <input type="hidden" id="hiddenField" name="hiddenField">
    <button type="submit">Submit</button>
</form>

<script>
document.getElementById('hiddenField').value = 'someValue'; // JavaScript赋值
</script>

<!-- yourJspPage.jsp -->
<%
    String value = request.getParameter("hiddenField");
    out.println("Value from JS: " + value);
%>

var value = 'someValue';
window.location.href = 'yourJspPage.jsp?param=' + encodeURIComponent(value);

<!-- yourJspPage.jsp -->
<%
    String value = request.getParameter("param");
    out.println("Value from JS: " + value);
%>

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

// YourServlet.java
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String value = request.getParameter("param");
    // 处理数据
    response.setContentType("application/json");
    response.getWriter().write("{\"received\": \"" + value + "\"}");
}