在jsp中隐藏提交时的post参数

<form action="your_action_url" method="post">
  <input type="hidden" name="hiddenParam" value="hiddenValue">
  <!-- other form fields -->
  <input type="submit" value="Submit">
</form>

<script>
  function submitForm() {
    var hiddenParam = "hiddenValue";
    var form = document.getElementById("yourForm");
    var hiddenInput = document.createElement("input");
    hiddenInput.setAttribute("type", "hidden");
    hiddenInput.setAttribute("name", "hiddenParam");
    hiddenInput.setAttribute("value", hiddenParam);
    form.appendChild(hiddenInput);
    form.submit();
  }
</script>

<form id="yourForm" action="your_action_url" method="post">
  <!-- other form fields -->
  <input type="button" value="Submit" onclick="submitForm()">
</form>

var xhr = new XMLHttpRequest();
xhr.open("POST", "your_action_url", true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.send("hiddenParam=hiddenValue");