js得到的值给servlet

// 获取输入框的值
var inputValue = document.getElementById('inputField').value;

// 创建一个XMLHttpRequest对象
var xhr = new XMLHttpRequest();

// 配置请求类型、URL以及是否异步
xhr.open('POST', '/YourServletPath', true);

// 设置请求头，告诉服务器我们发送的是表单数据
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

// 发送请求
xhr.send('inputValue=' + encodeURIComponent(inputValue));

// 处理响应
xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && xhr.status === 200) {
        console.log(xhr.responseText);
    }
};

import java.io.IOException;
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("/YourServletPath")
public class YourServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 获取前端发送的数据
        String inputValue = request.getParameter("inputValue");

        // 处理数据...

        // 返回响应
        response.setContentType("text/plain");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write("Received value: " + inputValue);
    }
}