结对开发_石家庄地铁查询web系统

结对开发：队友田昕可

大二上学期做过只有两号线的地铁查询系统，但是只能在控制台操作。这一次将线路加到了六条，并且要求web实现，下面简述一下设计思路和具体代码实现：

　　1.数据库建表

　　于我们自己习惯而言，我们写javaweb项目第一件事就是建库建表。六条线路，我们选择了分六个表存储，这样的话实际操作起来，分离的每一条线会使dao层写函数方便很多。

　　每一个表中只有三列属性：id，name，nearline

建表完成后，就需要在dbutil中写数据库连接的代码，这部分代码是模板代码，只需要修改库名即可。

package dbutil;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DButil {
    public static String url = "jdbc:mysql://localhost:3306/subway?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8";
    public static String user = "root";
    public static String password = "";
    public static String driver = "com.mysql.cj.jdbc.Driver";
    public static Connection getConn() {
        Connection conn = null;
        try {
            Class.forName(driver);

             // 连续数据库
            conn = DriverManager.getConnection(url, user, password);

        } catch (Exception e) {
            e.printStackTrace();
        }
        return conn;
    }

    public static void close(Statement state, Connection conn) {
        if(state!=null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(conn!=null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close(ResultSet rs, Statement state, Connection conn) {
        if(rs!=null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(state!=null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(conn!=null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}　

下一步队友选择写Javabean,因为每个表只有三个属性，所以javabean也十分简单，只有三个属性，只需要写他们的get和set方法，以及有参数和无参数的构造函数即可。

package bean;

public class Bean {
    private String name;
    private int number;
    private String nearline;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getNumber() {
        return number;
    }
    public void setNumber(int number) {
        this.number = number;
    }
    public String getNearline() {
        return nearline;
    }
    public void setNearline(String nearline) {
        this.nearline = nearline;
    }

    public Bean() {};
    public Bean(String name,int number,String nearline)
    {
        this.name=name;
        this.number=number;
        this.nearline=nearline;
    }

}

　　到这里我们的前期准备工作就已经做完了，现在还剩下dao包，servlet和前端界面以及输出界面没有书写，因为是两人团队项目，我个人分配了前端页面，于是前端界面就交给我了。

　　在我写前端的同时，他自己大概写了dao包中的几个常用函数，如果以后还有需求，再往上添加。select函数必备，还有一个检测输入的站点在几号线的函数checkstation（），还有一个带参数的select函数，方便通过参数调用select每条线的功能，简化代码量。除此之外，最重要的函数就是在一条线上给定两个参数，将他们之间站名全部输出的函数substation。

　　

package dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;

import bean.Bean;
import dbutil.DButil;

public class Dao {

    public String[] substation(Bean[] sub,String s1,String s2)
    {
        ArrayList<String> stationlist =new ArrayList<String>();
        int start=0;
        int end=0;
        int money;
        int i;
        for(i=0;i<sub.length;i++)
        {
            if(sub[i].getName().equals(s1))
            start=i;
        }//确定起始站
        for(i=0;i<sub.length;i++)
        {
            if(sub[i].getName().equals(s2))
            end=i;
        }//确定终点站

        if(start<end)
        {
        for(i=start;i<=end;i++)
        {
            stationlist.add(sub[i].getName());
        }//输出站点信息
        }
        else
        {
            for(i=start;i>=end;i--)
            {
                stationlist.add(sub[i].getName());
            }//输出站点信息
        }
        return stationlist.toArray(new String[stationlist.size()]);
    }

    public int checkstation(String start)
    {
        Dao dao=new Dao();
        int i;
        for(i=0;i<dao.selectno1().length;i++)
        {
            if(dao.selectno1()[i].getName().equals(start))
            {
                return 1;
            }
        }
        for(i=0;i<dao.selectno2().length;i++)
        {
            if(dao.selectno2()[i].getName().equals(start))
            {
                return 2;
            }

        }
        for(i=0;i<dao.selectno3().length;i++)
        {
            if(dao.selectno3()[i].getName().equals(start))
            {
                return 3;
            }
        }
        for(i=0;i<dao.selectno4().length;i++)
        {
            if(dao.selectno4()[i].getName().equals(start))
            {
                return 4;
            }
        }
        for(i=0;i<dao.selectno5().length;i++)
        {
            if(dao.selectno5()[i].getName().equals(start))
            {
                return 5;
            }
        }
        for(i=0;i<dao.selectno6().length;i++)
        {
            if(dao.selectno6()[i].getName().equals(start))
            {
                return 6;
            }
        }
        return 0;
    }

    public Bean[] select(int n)
    {
        Bean[] a=new Bean[] {};
        Dao dao=new Dao();
        if(n==1)
            return dao.selectno1();
        if(n==2)
            return dao.selectno2();
        if(n==3)
            return dao.selectno3();
        if(n==4)
            return dao.selectno4();
        if(n==5)
            return dao.selectno5();
        if(n==6)
            return dao.selectno6();
        else
            return a;
    }

    public Bean[] selectno1()
    {
        ArrayList<Bean> list=new ArrayList();
        Connection connection = DButil.getConn();
        Statement statement=null;
        ResultSet rs = null;
        try
        {
            statement = connection.createStatement();

             // 要执行的SQL语句
             String sql = "select * from no1 ";

             // 结果集
             rs = statement.executeQuery(sql);

             while(rs.next())
             {
                Bean selectbean=new Bean();
             String name = rs.getString("name");
             int number = rs.getInt("id");
             String nearline = rs.getString("nearline");

            selectbean.setName(name);
            selectbean.setNumber(number);
            selectbean.setNearline(nearline);
             list.add(selectbean);
             }
        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
            DButil.close(rs, statement, connection);
        }
        return list.toArray(new Bean[list.size()]);
    }//获取一号线的所有信息

    public Bean[] selectno2()
    {
        ArrayList<Bean> list=new ArrayList();
        Connection connection = DButil.getConn();
        Statement statement=null;
        ResultSet rs = null;
        try
        {
            statement = connection.createStatement();

             // 要执行的SQL语句
             String sql = "select * from no2 ";

             // 结果集
             rs = statement.executeQuery(sql);

             while(rs.next())
             {
                 Bean selectbean=new Bean();
             String name = rs.getString("name");
             int number = rs.getInt("id");
             String nearline = rs.getString("nearline");

            selectbean.setName(name);
            selectbean.setNumber(number);
            selectbean.setNearline(nearline);
             list.add(selectbean);
             }
        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
            DButil.close(rs, statement, connection);
        }
        return list.toArray(new Bean[list.size()]);
    }//获取二号线的所有信息

    public Bean[] selectno3()
    {
        ArrayList<Bean> list=new ArrayList();
        Connection connection = DButil.getConn();
        Statement statement=null;
        ResultSet rs = null;
        try
        {
            statement = connection.createStatement();

             // 要执行的SQL语句
             String sql = "select * from no3 ";

             // 结果集
             rs = statement.executeQuery(sql);

             while(rs.next())
             {
                 Bean selectbean=new Bean();
             String name = rs.getString("name");
             int number = rs.getInt("id");
             String nearline = rs.getString("nearline");

            selectbean.setName(name);
            selectbean.setNumber(number);
            selectbean.setNearline(nearline);
             list.add(selectbean);
             }
        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
            DButil.close(rs, statement, connection);
        }
        return list.toArray(new Bean[list.size()]);
    }//获取三号线的全部信息

    public Bean[] selectno4()
    {
        ArrayList<Bean> list=new ArrayList();
        Connection connection = DButil.getConn();
        Statement statement=null;
        ResultSet rs = null;
        try
        {
            statement = connection.createStatement();

             // 要执行的SQL语句
             String sql = "select * from no4 ";

             // 结果集
             rs = statement.executeQuery(sql);

             while(rs.next())
             {
                 Bean selectbean=new Bean();
             String name = rs.getString("name");
             int number = rs.getInt("id");
             String nearline = rs.getString("nearline");

            selectbean.setName(name);
            selectbean.setNumber(number);
            selectbean.setNearline(nearline);
             list.add(selectbean);
             }
        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
            DButil.close(rs, statement, connection);
        }
        return list.toArray(new Bean[list.size()]);
    }//获取四号线的全部信息

    public Bean[] selectno5()
    {
        ArrayList<Bean> list=new ArrayList();
        Connection connection = DButil.getConn();
        Statement statement=null;
        ResultSet rs = null;
        try
        {
            statement = connection.createStatement();

             // 要执行的SQL语句
             String sql = "select * from no5 ";

             // 结果集
             rs = statement.executeQuery(sql);

             while(rs.next())
             {
                 Bean selectbean=new Bean();
             String name = rs.getString("name");
             int number = rs.getInt("id");
             String nearline = rs.getString("nearline");

            selectbean.setName(name);
            selectbean.setNumber(number);
            selectbean.setNearline(nearline);
             list.add(selectbean);
             }
        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
            DButil.close(rs, statement, connection);
        }
        return list.toArray(new Bean[list.size()]);
    }//获取五号线的全部信息

    public Bean[] selectno6()
    {
        ArrayList<Bean> list=new ArrayList();
        Connection connection = DButil.getConn();
        Statement statement=null;
        ResultSet rs = null;
        try
        {
            statement = connection.createStatement();

             // 要执行的SQL语句
             String sql = "select * from no6 ";

             // 结果集
             rs = statement.executeQuery(sql);

             while(rs.next())
             {
                 Bean selectbean=new Bean();
             String name = rs.getString("name");
             int number = rs.getInt("id");
             String nearline = rs.getString("nearline");

            selectbean.setName(name);
            selectbean.setNumber(number);
            selectbean.setNearline(nearline);
             list.add(selectbean);
             }
        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
            DButil.close(rs, statement, connection);
        }
        return list.toArray(new Bean[list.size()]);
    }//获取六号线的全部信息

}

　　与此同时，我已经将界面做好，给了他接口，完成基本功能。