如何在jsp页面的<a>标签中使用onclick事件调用java函数

<a id="myLink" href="#" onclick="myFunction()">点击调用Java函数</a>

<script>
    function myFunction() {
        // 创建XMLHttpRequest对象
        var xmlhttp;
        if (window.XMLHttpRequest) {
            // 支持现代浏览器
            xmlhttp = new XMLHttpRequest();
        } else {
            // 支持旧版本IE浏览器
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        
        // 发送请求到后端的Java函数
        xmlhttp.open("GET", "MyServlet?param1=value1&param2=value2", true);
        xmlhttp.send();
    }
</script>

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 获取前端传递的参数
        String param1 = request.getParameter("param1");
        String param2 = request.getParameter("param2");
        
        // 执行Java函数逻辑
        // ...
        
        // 返回响应
        response.setContentType("text/plain");
        response.getWriter().write("Java函数执行成功！");
    }
}