js传值到servlet

var data = encodeURIComponent("value");
window.location.href = "YourServletURL?param=" + data;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String param = request.getParameter("param");
    // 处理参数
}

fetch('YourServletURL', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
    },
    body: 'param=value'
})
.then(response => response.text())
.then(data => console.log(data))
.catch((error) => console.error('Error:', error));

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