jsp页面怎么获取js传的值

function passValue() {
    var value = "exampleValue";
    window.location.href = "targetPage.jsp?param=" + encodeURIComponent(value);
}

<%
    String paramValue = request.getParameter("param");
    if (paramValue != null) {
        out.println("Received value: " + paramValue);
    }
%>

function submitFormWithValue() {
    var value = "exampleValue";
    document.getElementById('hiddenField').value = value;
    document.getElementById('myForm').submit();
}

<form id="myForm" action="targetPage.jsp" method="post">
    <input type="hidden" id="hiddenField" name="hiddenField">
</form>

<script>
    // JavaScript function call here
</script>

<%
    String hiddenFieldValue = request.getParameter("hiddenField");
    if (hiddenFieldValue != null) {
        out.println("Received value: " + hiddenFieldValue);
    }
%>

$.ajax({
    url: 'targetPage.jsp',
    type: 'POST',
    data: { param: 'exampleValue' },
    success: function(response) {
        console.log(response);
    }
});

<%
    String paramValue = request.getParameter("param");
    if (paramValue != null) {
        out.println("Received value: " + paramValue);
    }
%>