package org.example.dao;

import org.example.pojo.Station;

import java.sql.ResultSet;
import java.util.List;

public interface SubWay {
    List<String> stations(String line);
    List<String> lines(String stationname);
    List<Station> getShortLine(String start, String end);
    List<Station> getLessLines(String start, String end);
    List<String> res_line(ResultSet resultSet);
    List<Integer> res_stationid(ResultSet resultSet);
}

package org.example.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.List;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Station {
    private int stationid;
    private String stationname;
    private List<String> lines;
    private List<Integer> next;
    private int provideid;
}

package org.example.service;

import lombok.SneakyThrows;
import org.example.dao.SubWay;
import org.example.pojo.Station;
import org.example.utils.SqlUtils;

import java.sql.Array;
import java.sql.ResultSet;
import java.util.*;

public class SubWayService implements SubWay {
    @SneakyThrows
    @Override
    public List<String> stations(String line) {
        SqlUtils.getConnection();
        String sql="select * from line where "+line+"!=-1 order by stationid";
        ResultSet resultSet=SqlUtils.query(sql,null);
        if (!resultSet.next()) return null;
        resultSet.previous();
        List<String> stations=new ArrayList<>();
        while (resultSet.next()){
            stations.add(resultSet.getString("stationname"));
        }
        SqlUtils.closeConnection();
        return stations;
    }
    @SneakyThrows
    @Override
    public List<String> lines(String stationname) {
        SqlUtils.getConnection();
        System.out.println(stationname);
        String sql="select * from line where stationname = ?";
        ResultSet resultSet=SqlUtils.query(sql,new String[]{stationname});
        if (!resultSet.next()) return null;
        resultSet.previous();
        resultSet.next();
        List<String> lines=res_line(resultSet);
        SqlUtils.closeConnection();
        return lines;
    }
    @SneakyThrows
    public List<Station> getShortLine(String start, String end){
        SqlUtils.getConnection();
        String sql="select * from line";;
        HashMap<Integer,Station> stationHashMap=new HashMap<>();
        HashMap<Integer,Integer> dis=new HashMap<>();
        ResultSet resultSet=SqlUtils.query(sql,null);
        if (!resultSet.next()) return null;
        resultSet.previous();
        int st=0;
        int en=0;
        while (resultSet.next()){
            dis.put(resultSet.getInt(1),0x3f3f3f3f);
            if(resultSet.getString(2).equals(start)) st=resultSet.getInt(1);
            if(resultSet.getString(2).equals(end)) en=resultSet.getInt(1);
            stationHashMap.put(resultSet.getInt(1),
                    new Station(resultSet.getInt(1),
                            resultSet.getString(2),
                            res_line(SqlUtils.query("select * from line where stationid=?",new Integer[]{resultSet.getInt(1)})),
                            res_stationid(SqlUtils.query("select * from transfer where startid=?",new Integer[]{resultSet.getInt(1)})),
                            -1
            ));
        }
        Queue<Integer> queue=new LinkedList<>();
        queue.offer(st);
        dis.put(st,0);
        List<Integer> temp=null;
        while (!queue.isEmpty()){
            int t= queue.poll();
            if(t==en) break;
            temp=stationHashMap.get(t).getNext();
            if(temp==null) continue;
            for(int i:temp){
                if(dis.get(i)>dis.get(t)+1){
                    dis.put(i,dis.get(t)+1);
                    stationHashMap.get(i).setProvideid(t);
                    if(!queue.contains(i)) queue.add(i);
                }
            }
        }
        List<Station> res=new ArrayList<>();
        int k=en;
        while (k!=-1){
            res.add(stationHashMap.get(k));
            k=stationHashMap.get(k).getProvideid();
        }
        Collections.reverse(res);
        SqlUtils.closeConnection();
        return res;
    }
    @SneakyThrows
    public List<Station> getLessLines(String start, String end){
        SqlUtils.getConnection();
        String sql="select * from line";
        HashMap<Integer,Station> stationHashMap=new HashMap<>();
        HashMap<Integer,Integer> dis=new HashMap<>();
        ResultSet resultSet=SqlUtils.query(sql,null);
        if (!resultSet.next()) return null;
        resultSet.previous();
        int st=0;
        int en=0;
        while (resultSet.next()){
            dis.put(resultSet.getInt(1),0x3f3f3f3f);
            if(resultSet.getString(2).equals(start)) st=resultSet.getInt(1);
            if(resultSet.getString(2).equals(end)) en=resultSet.getInt(1);
            stationHashMap.put(resultSet.getInt(1),
                    new Station(resultSet.getInt(1),
                            resultSet.getString(2),
                            res_line(SqlUtils.query("select * from line where stationid=?",new Integer[]{resultSet.getInt(1)})),
                            res_stationid(SqlUtils.query("select * from transfer where startid=?",new Integer[]{resultSet.getInt(1)})),
                            -1
                    ));
        }
        Queue<Integer> queue=new LinkedList<>();
        queue.offer(st);
        dis.put(st,0);
        List<Integer> temp=null;
        while (!queue.isEmpty()){
            int t= queue.poll();
            temp=stationHashMap.get(t).getNext();
            if(temp==null) continue;
            for(int i:temp){
                if(Collections.disjoint(stationHashMap.get(t).getLines(),stationHashMap.get(i).getLines())){
                    if(dis.get(i)>dis.get(t)+1){
                        dis.put(i,dis.get(t)+1);
                        stationHashMap.get(i).setProvideid(t);
                        if(!queue.contains(i)) queue.add(i);
                    }
                }
                else{
                    if(dis.get(i)>dis.get(t)){
                        dis.put(i,dis.get(t));
                        stationHashMap.get(i).setProvideid(t);
                        if(!queue.contains(i)) queue.add(i);
                    }
                }
            }
        }
        int k=en;
        List<Station> res=new ArrayList<>();
        while (k!=-1){
            res.add(stationHashMap.get(k));
            k=stationHashMap.get(k).getProvideid();
        }
        Collections.reverse(res);
        SqlUtils.closeConnection();
        return res;
    }
    @SneakyThrows
    public List<String> res_line(ResultSet resultSet){
        resultSet.next();
        List<String> lines=new ArrayList<>();
        if(resultSet.getInt(3)>0) lines.add("地铁1号线");
        if(resultSet.getInt(4)>0) lines.add("地铁八通线");
        if(resultSet.getInt(5)>0) lines.add("地铁2号线");
        if(resultSet.getInt(6)>0) lines.add("地铁4号线");
        if(resultSet.getInt(7)>0) lines.add("地铁大兴线");
        if(resultSet.getInt(8)>0) lines.add("地铁5号线");
        if(resultSet.getInt(9)>0) lines.add("地铁6号线");
        if(resultSet.getInt(10)>0) lines.add("地铁7号线");
        if(resultSet.getInt(11)>0) lines.add("地铁8号线");
        if(resultSet.getInt(12)>0) lines.add("地铁9号线");
        if(resultSet.getInt(13)>0) lines.add("地铁10号线");
        if(resultSet.getInt(14)>0) lines.add("地铁13号线");
        if(resultSet.getInt(15)>0) lines.add("地铁14号线");
        if(resultSet.getInt(16)>0) lines.add("地铁15号线");
        if(resultSet.getInt(17)>0) lines.add("地铁房山线");
        if(resultSet.getInt(18)>0) lines.add("地铁昌平线");
        if(resultSet.getInt(19)>0) lines.add("地铁亦庄线");
        if(resultSet.getInt(20)>0) lines.add("机场线");
        return lines;
    }

    @SneakyThrows
    public List<Integer> res_stationid(ResultSet resultSet){
        List<Integer> id=new ArrayList<>();
        while (resultSet.next()){
            id.add(resultSet.getInt(2));
        }
        return id;
    }
}

package org.example.servlet;

import javax.servlet.*;
import java.io.IOException;

public class AllFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("过滤器加载");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        servletRequest.setCharacterEncoding("UTF-8");
        servletResponse.setCharacterEncoding("UTF-8");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        System.out.println("过滤器销毁");
    }
}

package org.example.servlet;

import org.example.dao.SubWay;
import org.example.pojo.Station;
import org.example.service.SubWayService;

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

public class SelectLessLines extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        SubWay subWay=new SubWayService();
        String start=req.getParameter("start");
        String end=req.getParameter("end");
        List<Station> stations=subWay.getLessLines(start,end);
        req.setAttribute("stations",stations);
        req.getRequestDispatcher("/resless").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

package org.example.servlet;

import org.example.dao.SubWay;
import org.example.service.SubWayService;

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

public class SelectLines extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        SubWay service=new SubWayService();
        List<String> list=service.lines(req.getParameter("stationname"));
        req.setAttribute("lines",list);
        req.getRequestDispatcher("/resline").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

package org.example.servlet;

import org.example.dao.SubWay;
import org.example.pojo.Station;
import org.example.service.SubWayService;

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

public class SelectShortLine extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        SubWay subWay=new SubWayService();
        String start=req.getParameter("start");
        String end=req.getParameter("end");
       List<Station> stations=subWay.getShortLine(start,end);
       req.setAttribute("stations",stations);
       req.getRequestDispatcher("/resshort").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

package org.example.servlet;

import org.example.dao.SubWay;
import org.example.service.SubWayService;

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

public class SelectStations extends HttpServlet {

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       SubWay service=new SubWayService();
        List<String> list=service.stations(req.getParameter("kind"));
        req.setAttribute("stations",list);
        req.getRequestDispatcher("/resstation").forward(req,resp);
    }


    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

package org.example.utils;

import lombok.SneakyThrows;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class SqlUtils {
    private static String driver = "com.mysql.jdbc.Driver";
    private static String url = "jdbc:mysql://localhost:3307/subway";
    private static String username = "root";
    private static String password = "123456";
    private static Connection connection;
    private static PreparedStatement preparedStatement;

    @SneakyThrows
    public static void getConnection() {
        Class.forName(driver);
        connection = DriverManager.getConnection(url, username, password);
    }

    @SneakyThrows
    public static int update(String sql, Object[] s) {
        preparedStatement = connection.prepareStatement(sql, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
        if(s==null) return preparedStatement.executeUpdate();
        for (int i = 0; i < s.length; i++) {
            if (s[i] == null) {
                return 0;
            }
            preparedStatement.setObject(i + 1, s[i]);
        }
        return preparedStatement.executeUpdate();
    }

    @SneakyThrows
    public static ResultSet query(String sql, Object[] s) {
        preparedStatement = connection.prepareStatement(sql, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
        if(s==null) return preparedStatement.executeQuery();
        for (int i = 0; i < s.length; i++) {
            if (s[i] == null) {
                break;
            }
            preparedStatement.setObject(i + 1, s[i]);
        }
        return preparedStatement.executeQuery();
    }
    @SneakyThrows
    public static void closeConnection(){
        if(preparedStatement!=null) preparedStatement.close();
        if(connection!=null) connection.close();
    }
}

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.util.List" %>
<%@ page import="org.example.pojo.Station" %>
<%@ page import="org.apache.commons.collections.CollectionUtils" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.Collections" %>
<html>
<head>
    <title>最少换乘路线</title>
    <style>
        th{
            border: orange solid 2px;
            font-size: 40pt
        }
        td{
            border: orange solid 2px;
            font-size: 20pt
        }
    </style>
</head>
<body>
<table>
    <%
        List<Station> stations=(List<Station>) request.getAttribute("stations");
        if(stations!=null){
            boolean flag=false;
            List<String> a=new ArrayList<>();
            List<String> b=new ArrayList<>();
            List<String> c=new ArrayList<>();
            List<String> ab=new ArrayList<>();
            List<String> bc=new ArrayList<>();
    %>
    <tr>
        <th>路线站点名</th>
    </tr>
    <tr>
        <td>站点数量:<%=stations.size()%></td>
    </tr>
    <%for(int i=0;i<stations.size();i++){
        a=null;
        b=null;
        c=null;
        flag=false;
        if(i-1>0) a=stations.get(i-1).getLines();
        b=stations.get(i).getLines();
        if(i+1<stations.size()) c=stations.get(i+1).getLines();
        if(a!=null&&c!=null){
            bc= (List<String>) CollectionUtils.intersection(b,c);
            flag=!Collections.disjoint(a,c);
        }
        else flag=true;


    %>
    <tr>
        <td>
            <%=stations.get(i).getStationname()%>
            <%
                if(!flag){
                    response.getWriter().print("(换乘"+bc.get(0)+")");
                }
            %>
        </td>
    </tr>
    <%}%>
    <%}%>
</table>
</body>
</html>

<%@ page import="java.util.List" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>路线结果</title>
</head>
<body style="text-align: center">
<table>
  <%
    List<String> lines=(List<String>) request.getAttribute("lines");
    if(lines!=null){
  %>
  <tr>
    <th style="border: orange solid 2px;font-size: 40pt">所属线路</th>
  </tr>
  <%for(String s:lines){%>
  <tr>
    <td style="border: orange solid 2px;font-size: 20pt"><%=s%></td>
  </tr>
  <%}%>
  <%
    }
    else {
  %>
  <%}%>
</table>
</body>
</html>

<%@ page import="java.util.List" %>
<%@ page import="org.example.pojo.Station" %>
<%@ page import="org.apache.commons.collections.CollectionUtils" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.Collections" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>最短路线</title>
    <style>
        th{
            border: orange solid 2px;
            font-size: 40pt
        }
        td{
            border: orange solid 2px;
            font-size: 20pt
        }
    </style>
</head>
<body>
<table>
    <%
        List<Station> stations=(List<Station>) request.getAttribute("stations");
        if(stations!=null){
            boolean flag=false;
            List<String> a=new ArrayList<>();
            List<String> b=new ArrayList<>();
            List<String> c=new ArrayList<>();
            List<String> ab=new ArrayList<>();
            List<String> bc=new ArrayList<>();
    %>
    <tr>
        <th>路线站点名</th>
    </tr>
    <tr>
        <td>站点数量:<%=stations.size()%></td>
    </tr>
    <%for(int i=0;i<stations.size();i++){
        a=null;
        b=null;
        c=null;
        flag=false;
        if(i-1>0) a=stations.get(i-1).getLines();
        b=stations.get(i).getLines();
        if(i+1<stations.size()) c=stations.get(i+1).getLines();
        if(a!=null&&c!=null){
            bc= (List<String>) CollectionUtils.intersection(b,c);
            flag=!Collections.disjoint(a,c);
        }
        else flag=true;


    %>
    <tr>
        <td>
            <%=stations.get(i).getStationname()%>
            <%
            if(!flag){
                response.getWriter().print("(换乘"+bc.get(0)+")");
            }
            %>
        </td>
    </tr>
    <%}%>
    <%}%>
</table>
</body>
</html>

<%@ page import="java.util.List"%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>站点结果</title>
</head>
<body style="text-align: center">
<table>
        <%
      List<String> stations=(List<String>) request.getAttribute("stations");
      if(stations!=null){
    %>
    <tr>
        <th style="font-size: 40pt;border: orange solid 2px;">站点名称</th>
    </tr>
        <%for (String s:stations){%>
    <tr>
        <td style="border: orange solid 2px;font-size: 20pt"><%=s%></td>
    </tr>
        <%}%>
        <%
      }
    %>
</table>
</body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <servlet>
        <servlet-name>SelectStations</servlet-name>
        <servlet-class>org.example.servlet.SelectStations</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>SelectStations</servlet-name>
        <url-pattern>/selectstations</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>SelectLines</servlet-name>
        <servlet-class>org.example.servlet.SelectLines</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>SelectLines</servlet-name>
        <url-pattern>/selectlines</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>resstation</servlet-name>
        <jsp-file>/WEB-INF/Stations.jsp</jsp-file>
    </servlet>
    <servlet-mapping>
        <servlet-name>resstation</servlet-name>
        <url-pattern>/resstation</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>resline</servlet-name>
        <jsp-file>/WEB-INF/Lines.jsp</jsp-file>
    </servlet>
    <servlet-mapping>
        <servlet-name>resline</servlet-name>
        <url-pattern>/resline</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>selectshortline</servlet-name>
        <servlet-class>org.example.servlet.SelectShortLine</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>selectshortline</servlet-name>
        <url-pattern>/selectshort</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>selectlessline</servlet-name>
        <servlet-class>org.example.servlet.SelectLessLines</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>selectlessline</servlet-name>
        <url-pattern>/selectless</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>resshort</servlet-name>
        <jsp-file>/WEB-INF/ShortLine.jsp</jsp-file>
    </servlet>
    <servlet-mapping>
        <servlet-name>resshort</servlet-name>
        <url-pattern>/resshort</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>resless</servlet-name>
        <jsp-file>/WEB-INF/LessLine.jsp</jsp-file>
    </servlet>
    <servlet-mapping>
        <servlet-name>resless</servlet-name>
        <url-pattern>/resless</url-pattern>
    </servlet-mapping>
    <filter>
        <filter-name>allfilter</filter-name>
        <filter-class>org.example.servlet.AllFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>allfilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

<%@ page import="java.util.List" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>北京地铁系统</title>
    <style>
      body{
        text-align: center;
      }
      span{
        margin: 5px;
        border: 2px solid blanchedalmond;
        font-size: 15pt;
        background: blanchedalmond;
      }
      form{
        text-align: center;
        border: deepskyblue solid 2px;
        width: 400px;
        height: 400px;
        margin-left: 200px;
        margin-top: 50px;
      }
      input{
        font-size: 15pt;
      }
    </style>
    <script>
      function a1(){
        document.getElementById('f1').style.display='block'
        document.getElementById('f2').style.display='none'
        document.getElementById('f3').style.display='none'
        document.getElementById('f4').style.display='none'
        document.getElementById('t1').style.background='paleturquoise'
        document.getElementById('t2').style.background='blanchedalmond'
        document.getElementById('t3').style.background='blanchedalmond'
        document.getElementById('t4').style.background='blanchedalmond'
      }
      function a2(){
        document.getElementById('f1').style.display='none'
        document.getElementById('f2').style.display='block'
        document.getElementById('f3').style.display='none'
        document.getElementById('f4').style.display='none'
        document.getElementById('t1').style.background='blanchedalmond'
        document.getElementById('t2').style.background='paleturquoise'
        document.getElementById('t3').style.background='blanchedalmond'
        document.getElementById('t4').style.background='blanchedalmond'
      }
      function a3(){
        document.getElementById('f1').style.display='none'
        document.getElementById('f2').style.display='none'
        document.getElementById('f3').style.display='block'
        document.getElementById('f4').style.display='none'
        document.getElementById('t1').style.background='blanchedalmond'
        document.getElementById('t2').style.background='blanchedalmond'
        document.getElementById('t3').style.background='paleturquoise'
        document.getElementById('t4').style.background='blanchedalmond'
      }
      function a4(){
        document.getElementById('f1').style.display='none'
        document.getElementById('f2').style.display='none'
        document.getElementById('f3').style.display='none'
        document.getElementById('f4').style.display='block'
        document.getElementById('t1').style.background='blanchedalmond'
        document.getElementById('t2').style.background='blanchedalmond'
        document.getElementById('t3').style.background='blanchedalmond'
        document.getElementById('t4').style.background='paleturquoise'
      }
    </script>
  </head>
  <body>
  <span onclick="a1()" id="t1">线路站点查询</span>
  <span onclick="a2()" id="t2">线路名称查询</span>
  <span onclick="a3()" id="t3">最短路径查询查询</span>
  <span onclick="a4()" id="t4">最少换乘查询</span>
  <form id="f1" style="display: block" action="/selectstations" method="post">
    <h1>线路站点选择</h1>
  <select name="kind" style="font-size: 20pt">
    <option value="line1">地铁1号线</option>
    <option value="line2">地铁八通线</option>
    <option value="line3">地铁2号线</option>
    <option value="line4">地铁4号线</option>
    <option value="line5">地铁大兴线</option>
    <option value="line6">地铁5号线</option>
    <option value="line7">地铁6号线</option>
    <option value="line8">地铁7号线</option>
    <option value="line9">地铁8号线</option>
    <option value="line10">地铁9号线</option>
    <option value="line11">地铁10号线</option>
    <option value="line12">地铁13号线</option>
    <option value="line13">地铁14号线</option>
    <option value="line14">地铁15号线</option>
    <option value="line15">地铁房山线</option>
    <option value="line16">地铁昌平线</option>
    <option value="line17">地铁亦庄线</option>
    <option value="line18">机场线</option>
  </select>
    <input type="submit" value="查询" style="margin: 30px;font-size: 15pt">
  </form>
  <form id="f2" style="display: none" action="/selectlines" method="post">
    <h1>站点名</h1>
    <input type="text" name="stationname" placeholder="请输入站点名" required="required">
    <br/>
    <input type="submit" value="查询" style="margin: 30px;font-size: 15pt">
  </form>
  <form id="f3" style="display: none" method="post" action="/selectshort">
    <h1>起点</h1>
    <input type="text" name="start"placeholder="输入起始点"  required="required">
    <h1>终点</h1>
    <input type="text" name="end" placeholder="请输入终点" required="required">
    <br/>
    <input type="submit" value="查询" style="margin: 30px;font-size: 15pt">
  </form>
  <form id="f4" style="display: none" method="post" action="/selectless">
    <h1>起点</h1>
    <input type="text" name="start" placeholder="输入起始点" required="required">
    <h1>终点</h1>
    <input type="text" name="end" placeholder="请输入终点" required="required">
    <br/>
    <input type="submit" value="查询" style="margin: 30px;font-size: 15pt">
  </form>
  </body>
</html>

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