写出根据学号，姓名使用vue实现按钮查询功能的前端代码，并且使用java语言写出后端代码

前端代码：

<template>
  <div>
    <input v-model="queryName" placeholder="姓名">
    <input v-model="queryId" placeholder="学号">
    <button @click="query">查询</button>
    <div>{{result}}</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      queryName: '',
      queryId: '',
      result: ''
    }
  },
  methods: {
    async query() {
      const response = await fetch(`/api/query?name=${this.queryName}&id=${this.queryId}`)
      const data = await response.json()
      this.result = data.result
    }
  }
}
</script>

后端代码：

import java.util.HashMap;
import java.util.Map;

import static spark.Spark.get;
import static spark.Spark.port;

public class Main {
    public static void main(String[] args) {
        port(8080);

        Map<String, String> studentMap = new HashMap<>();
        studentMap.put("20210001", "张三");
        studentMap.put("20210002", "李四");

        get("/api/query", (req, res) -> {
            String name = req.queryParams("name");
            String id = req.queryParams("id");
            String result = "未找到该学生";
            if (studentMap.containsKey(id) && studentMap.get(id).equals(name)) {
                result = "姓名：" + name + "，学号：" + id;
            }
            Map<String, String> resultMap = new HashMap<>();
            resultMap.put("result", result);
            return resultMap;
        }, JsonUtil.json());
    }
}

请注意，这只是一份简单的样例代码，实际项目中需要根据具体需求进行修改和完善。