今天做了什么:

完成了通过地铁线路号查询地铁站和通过地铁站chaxun线路

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import javax.swing.text.html.HTML;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

@WebServlet("/point")

public class pointservlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse resp) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String point =request.getParameter("point");
        Dao dao=new Dao();
        String lineid="";
        List<String> list=new ArrayList<>();
        list=dao.pointselect(point);
        for (String a:list) {
            lineid=lineid+a+" , ";
        }
        request.setAttribute("lineid",lineid+"号线");
        request.setAttribute("point",point);
        request.getRequestDispatcher("point.jsp").forward(request,resp);

    }
}
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.List;

@WebServlet("/line")
public class lineservlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse resp) throws ServletException, IOException {
        String line=request.getParameter("line");
        String line1="";
        Dao dao=new Dao();
        List<position> list =dao.lineselect(line);
        for (position point:list) {
            //System.out.println(point.getPosition());
            line1=line1+point.getPosition()+"-->";
            request.setAttribute("line1",line1);
            request.setAttribute("line",line+"号线");
            }
        request.getRequestDispatcher("line.jsp").forward(request,resp);
    }
}
<%--&lt;%&ndash;--%>
<%--  Created by IntelliJ IDEA.--%>
<%--  User: 29782--%>
<%--  Date: 2024/4/23--%>
<%--  Time: 17:07--%>
<%--  To change this template use File | Settings | File Templates.--%>
<%--&ndash;%&gt;--%>
<%--<%@ page contentType="text/html;charset=UTF-8" language="java" %>--%>
<%--<html>--%>
<%--<head>--%>
<%--    <title>Title</title>--%>
<%--</head>--%>
<%--<body>--%>
<%--<form method="post" action="line">--%>
<%--    <input type="text" name="line">--%>
<%--    <button>提交</button><br>--%>
<%--    <div>${line}</div>--%>
<%--</form>--%>
<%--</body>--%>
<%--</html>--%>
<%--
  Created by IntelliJ IDEA.
  User: 29782
  Date: 2024/3/31
  Time: 19:32
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Demo</title>
    <!-- 请勿在项目正式环境中引用该 layui.css 地址 -->
    <link href="layui/css/layui.css" rel="stylesheet">
</head>
<body>
<form method="post" action="line">
    <div class="layui-form">
        <input type="text" name="line" placeholder="请输入地铁线的名称" class="layui-input">
        <hr class="ws-space-16">
    </div>
    <div class="layui-btn-container">
        <button type="submit" class="layui-btn">提交</button>
    </div>
</form>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Demo</title>
    <!-- 请勿在项目正式环境中引用该 layui.css 地址 -->
    <link href="layui/css/layui.css" rel="stylesheet">
</head>
<body>
<br>
<br>
<table class="layui-table">
    <colgroup>
        <col width="150">
        <col width="150">
        <col>
    </colgroup>
    <thead>
    <tr>
        <th>地铁号</th>
        <th>路线</th>
    </tr>
    </thead>
    <tbody>
    <tr>
        <td>${line}</td>
        <td>${line1}</td>
    </tr>

    </tbody>
</table>

<!-- 请勿在项目正式环境中引用该 layui.js 地址 -->
<script src="layui/layui.js"></script>

</body>
</html>
<%--&lt;%&ndash;--%>
<%--  Created by IntelliJ IDEA.--%>
<%--  User: 29782--%>
<%--  Date: 2024/4/24--%>
<%--  Time: 16:38--%>
<%--  To change this template use File | Settings | File Templates.--%>
<%--&ndash;%&gt;--%>
<%--<%@ page contentType="text/html;charset=UTF-8" language="java" %>--%>
<%--<html>--%>
<%--<head>--%>
<%--    <title>Title</title>--%>
<%--</head>--%>
<%--<body>--%>
<%--<form method="post" action="point">--%>
<%--  <input type="text" name="point">--%>
<%--  <button>提交</button><br>--%>
<%--  <div>${lineid}</div>--%>
<%--</form>--%>
<%--</body>--%>
<%--</html>--%>
<%--
<%--
  Created by IntelliJ IDEA.
  User: 29782
  Date: 2024/3/31
  Time: 19:32
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Demo</title>
    <!-- 请勿在项目正式环境中引用该 layui.css 地址 -->
    <link href="layui/css/layui.css" rel="stylesheet">
</head>
<body>
<form method="post" action="point">
    <div class="layui-form">
        <input type="text" name="point" placeholder="请输入站点的名称" class="layui-input">
        <hr class="ws-space-16">
    </div>
    <div class="layui-btn-container">
        <button type="submit" class="layui-btn">提交</button>
    </div>
</form>
<br>
<br>
<table class="layui-table">
    <colgroup>
        <col width="150">
        <col width="150">
        <col>
    </colgroup>
    <thead>
    <tr>
        <th>地铁站</th>
        <th>地铁号</th>
    </tr>
    </thead>
    <tbody>
    <tr>
        <td>${point}</td>
        <td>${lineid}</td>
    </tr>

    </tbody>
</table>
<script src="layui/layui.js"></script>
</body>
</html>

遇到了什么困难:

无

明天准备做什么:

准备学习迪杰斯特拉算法进行最短路径查找

代码量 300行