js怎么用jsp里的数据

<%
    String jspData = "Hello from JSP!";
%>
<script type="text/javascript">
    var jsData = "<%= jspData %>";
    console.log(jsData);
</script>

<div id="dataContainer" data-jsp-data="<%= jspData %>"></div>
<script type="text/javascript">
    var jsData = document.getElementById('dataContainer').getAttribute('data-jsp-data');
    console.log(jsData);
</script>

// 示例 Servlet
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("application/json");
    PrintWriter out = response.getWriter();
    String data = "{\"message\": \"Hello from JSP!\"}";
    out.print(data);
    out.flush();
}

fetch('path_to_your_servlet')
    .then(response => response.json())
    .then(data => {
        console.log(data.message);
    })
    .catch(error => console.error('Error:', error));