无法在java脚本方法中传递ajax post

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/ajax")
public class AjaxServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 读取请求中的数据
        BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));
        String requestData = reader.readLine();
        
        // 处理请求数据
        // TODO: 在这里编写处理逻辑
        
        // 返回响应
        response.setContentType("text/plain");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write("Response from server");
    }
}