js给servlet传参数

function sendData() {
    var param = "name=John&age=30";
    var xhr = new XMLHttpRequest();
    xhr.open("GET", "YourServletURL?" + param, true);
    xhr.onreadystatechange = function() {
        if (xhr.readyState == 4 && xhr.status == 200) {
            console.log(xhr.responseText);
        }
    };
    xhr.send();
}

function sendData() {
    var param = "name=John&age=30";
    var xhr = new XMLHttpRequest();
    xhr.open("POST", "YourServletURL", true);
    xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    xhr.onreadystatechange = function() {
        if (xhr.readyState == 4 && xhr.status == 200) {
            console.log(xhr.responseText);
        }
    };
    xhr.send(param);
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String name = request.getParameter("name");
    String age = request.getParameter("age");
    // 处理数据...
    response.getWriter().write("Received: " + name + ", " + age);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String name = request.getParameter("name");
    String age = request.getParameter("age");
    // 处理数据...
    response.getWriter().write("Received: " + name + ", " + age);
}