java-结对编程：分数整数，运算符个数，运算范围，加减乘除四则运算出题器

结对开发团队成员：赵子鸣、周宝辉

设计思想：

程序中涉及了简单的mvc框架中的jsp+javabean结构，将整数和分数式子的类写到src中entity的包中，将一些关于数据库的操作写到sql包中；jsp有三个，第一个是选择界面（选择一些简单的参数，例如整数或者分数，出题数据范围，算式运算符个数，式子个数等等），将这些参数传到第二个jsp中，在第二个jsp得到用户输入的参数，并且生成相应的算式题目，在第三个jsp中判断对错，在jsp中调用包中的类，直接使用.java中的分数整数类，在一些数据库操作中也是直接调用封装好的sql包中函数，来实现连接数据库，插入数据等操作。

其中，对于算式的计算是用递归实现的，比如3个数计算，可以先算一步，变成2个数的算式，由此可以递归来实现算式的结果。

源程序代码：

entity包

Fenshu.java

package entity;

public class Fenshu {
    int a;
    int b;
    
    public static Fenshu jisuanjieguo(Fenshu a[],int b[],int n){
        Fenshu jie=new Fenshu();
        if(n==1){jie=jisuan(a[0],b[0],a[1]);}
        else {
            int ii=0;boolean z=false;
            for(int i=0;i<n;i++){
                if(b[i]==3||b[i]==4){
                    ii=i;
                    z=true;
                    break;
                }
            }
            if(z==true){
                a[ii]=jisuan(a[ii],b[ii],a[ii+1]);
                if(ii!=n-1){
                    for(int i=ii;i<n-1;i++){
                        b[i]=b[i+1];
                        a[i+1]=a[i+2];
                    }
                }
                jie=jisuanjieguo(a,b,n-1);
            }
            else {
                a[0]=jisuan(a[0],b[0],a[1]);
                for(int i=0;i<n-1;i++){
                    b[i]=b[i+1];
                    a[i+1]=a[i+2];
                }
                jie=jisuanjieguo(a,b,n-1);
            }
        }
        return jie;
    }
    public static Fenshu jisuan(Fenshu aaa,int bbb,Fenshu ccc){
        Fenshu d=new Fenshu();
        int a1=1,b1=1;
        if(bbb==1){
            b1=aaa.b*ccc.b;
            a1=aaa.a*ccc.b+aaa.b*ccc.a;
        }
        else if(bbb==2){
            b1=aaa.b*ccc.b;
            a1=aaa.a*ccc.b-aaa.b*ccc.a;
        }
        else if(bbb==3){
            b1=aaa.b*ccc.b;
            a1=aaa.a*ccc.a;
        }
        else {
            b1=aaa.b*ccc.a;
            a1=aaa.a*ccc.b;
        }
        d.set(a1,b1);
        d.yue();
        return d;
    }
    public void set(int aa,int bb){
        a=aa;
        b=bb;
    }
    public int zuidayin(){
        int c=0,d=1;
        if(a<b) c=a;
        else c=b;
        for(int i=1;i<=c;i++){
            if(a%i==0&&b%i==0){
                d=i;
            }
        }
        return d;
    }
    public void yue(){
        int y=this.zuidayin();
        if(y!=1){
            a=a/y;
            b=b/y;
        }
    }
    public String dai(){
        String p="";
        if(a>=b){
            int q=a/b;
            int w=a-b*q;
            return p+q+"'"+w+"/"+b;
        }
        else {
            return p+a+"/"+b;
        }
    }
    public String fanhui(){
        String r="";
        r="("+a+"/"+b+")";
        return r;
    }
}

Fenshude.java

package entity;

public class Fenshude {
    Fenshu as[];
    int fu[];
    int fanwei;
    int shu;
    public void getshu(int n){
        shu=n;
        as=new Fenshu [n+1];
        fu=new int [n];
    }
    public void getfanwei(int a){
        fanwei=a;
    }
    public void shengcheng(int pp){
        for(int i=0;i<shu;i++){
            if(pp==1)
                fu[i]=(int)(Math.random()*4+1);
            else 
                fu[i]=(int)(Math.random()*2+1);
        }
        for(int i=0;i<shu+1;i++){
            int ii=0;
            as[i]=new Fenshu();
            while(ii==0){
                as[i].b=(int)(Math.random()*(fanwei-1)+1);
                as[i].a=(int)(Math.random()*(fanwei-1)+1);
                if(as[i].a<as[i].b){ii=1;}
            }
        }
    }
    public String zhuan(int a){
        if(a==1) return "+";
        else if(a==2) return "-";
        else if(a==3)return "*";
        else return "/";
    }
    public String show(){
        String uuu="";
        for(int i=0;i<shu;i++){
            uuu="("+as[i].a+"/"+as[i].b+") "+zhuan(fu[i]);
            System.out.print("("+as[i].a+"/"+as[i].b+") "+zhuan(fu[i])+" ");
        }
        uuu=uuu+"("+as[shu].a+"/"+as[shu].b+")";
        System.out.print("("+as[shu].a+"/"+as[shu].b+")");
        System.out.println(" =");
        return uuu;
    }

    public Fenshu jieguo(){
        Fenshu jieguo=new Fenshu();
        jieguo=Fenshu.jisuanjieguo(as,fu,shu);
        return jieguo;
    }
    public Fenshu showjieguo(){
        Fenshu ee=jieguo();
        System.out.println("   结果为:"+ee.a+"/"+ee.b);
        return ee;
    }
    public String showshizi(){
        String r="";
        for(int i=0;i<shu;i++){
            r=r+as[i].fanhui()+zhuan(fu[i]);
        }
        r=r+as[shu].fanhui();
        return r;
    }
    public String showdaan(){
        String r="";
        Fenshu ee=jieguo();
        r=r+ee.a+"/"+ee.b;
        if(ee.b==1)
            r=""+ee.a;
        return r;
    }
    
}

Panduan.java

package entity;

public class Panduan{
    
    public static int panduan1(String b)
    {
        if(b.equals("2"))
            return 2;
        else if(b.equals("3"))
            return 3;
        else if(b.equals("4"))
            return 4;
        else if(b.equals("5"))
            return 5;
        else
            return 0;
    }
    public static int panduan2(String b)
    {
        if(b.equals("10"))
            return 10;
        else if(b.equals("50"))
            return 50;
        else if(b.equals("100"))
            return 100;
        else 
            return 0;
    }
    public static void main(String[]arg)
    {
        String a="2";
        int m=panduan1(a);
        System.out.println(m);
        int n=panduan2("10");
        System.out.println(n);
    }

}

Suan.java

package entity;

public class Suan {
    int fanwei;
    int shu;
    int zheng[];
    int fu[];
    public void getshu(int n){
        shu=n;
        zheng=new int [n+1];
        fu=new int [n];
    }
    public void getfanwei(int a){
        fanwei=a;
    }
    public void shengcheng(int pp){
        for(int i=0;i<shu;i++){
            if(pp==1)
                fu[i]=(int)(Math.random()*4+1);
            else 
                fu[i]=(int)(Math.random()*2+1);
        }
        for(int i=0;i<shu+1;i++){
            zheng[i]=(int)(Math.random()*(fanwei-1)+1);
        }
        for(int i=0;i<shu;i++){
            int aa=1;
            while(aa==1){
                if(fu[i]==2){
                    if(zheng[i]>=zheng[i+1]){
                        aa=0;
                    }
                    else{
                        zheng[i]=(int)(Math.random()*(fanwei-1)+1);
                        zheng[i+1]=(int)(Math.random()*(fanwei-1)+1);
                    }
                }
                else if(fu[i]==4){
                    if(zheng[i]<zheng[i+1]){
                        aa=0;
                    }
                    else{
                        zheng[i]=(int)(Math.random()*(fanwei-1)+1);
                        zheng[i+1]=(int)(Math.random()*(fanwei-1)+1);
                    }
                }
                else{
                    aa=0;
                }
            }
        }
    }
    public String zhuan(int a){
        if(a==1) return "+";
        else if(a==2) return "-";
        else if(a==3)return "*";
        else return "/";
    }
    public String show(){
        String uuu="";
        for(int i=0;i<shu;i++){
            uuu=uuu+zheng[i]+zhuan(fu[i]);
            System.out.print(zheng[i]+" "+zhuan(fu[i])+" ");
        }
        uuu=uuu+zheng[shu];
        System.out.print(zheng[shu]);
        System.out.println(" =");
        return uuu;
    }

    public Fenshu jieguo(){
        Fenshu qq[]=new Fenshu[shu+1];
        for(int i=0;i<shu+1;i++){
            qq[i]=new Fenshu();
            qq[i].set(zheng[i],1);
        }
        Fenshu jieguo=new Fenshu();
        jieguo=Fenshu.jisuanjieguo(qq,fu,shu);
        return jieguo;
    }
    public Fenshu showjieguo(){
        Fenshu ee=jieguo();
        System.out.println("   结果为:"+ee.a+"/"+ee.b);
        return ee;
    }
    public String showdaan(){
        String r="";
        Fenshu ee=jieguo();
        r=r+ee.a+"/"+ee.b;
        if(ee.b==1)
            r=""+ee.a;
        return r;
    }
    public String showshizi(){
        String r="";
        for(int i=0;i<shu;i++){
            r=r+zheng[i]+zhuan(fu[i]);
        }
        r=r+zheng[shu];
        return r;
    }
    public String fanhui(){
        String aq="";
        for(int i=0;i<shu;i++){
            aq=aq+""+zheng[i]+zhuan(fu[i]);
        }
        aq=aq+zheng[shu];
        return aq;
    }
}

sql包

Sql.java

package sql;

import java.sql.*;

public class Sql {
    static Connection con=null;
    static Statement stmt=null;
    static PreparedStatement psmt=null;
    public static Statement get(){
        return stmt;
    }
    public static void lianjie(){
        try{
            Class.forName("com.mysql.jdbc.Driver");
            con=DriverManager.getConnection("jdbc:mysql://127.0.0.1/web_number","root","baohui");
            stmt=con.createStatement();
            System.out.print("数据库连接成功");
            //out.print("<p>");
        }
        catch(Exception e)
        {
            System.out.print(e);
        }
        
    }
    public static void insert (int a,String b,String c)throws Exception{
        
        try
        {
            String sql2="insert into web (number,shizi,jieguo) values (?,?,?)";
            psmt=con.prepareStatement(sql2);
            psmt.setInt(1,a);
            psmt.setString(2,b);
            psmt.setString(3,c);
            psmt.executeUpdate();
            //out.print("插入成功！");    
        }
        catch(Exception e)
        {
             //out.print(e);
        }
        
    }
    public static void delete()throws Exception{
        String sql1="delete from web";
        stmt.execute(sql1);
    }
    public static void guan()throws Exception{
        psmt.close();
        stmt.close();
        con.close();
    }
    public static void main(String arg[]){
        lianjie();
    }
    
}

jsp

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@page import="entity.*"%>
<%@page import="sql.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>出题</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <form id=form1 method="post" action="judge.jsp" >
    <% 
    request.setCharacterEncoding("utf-8");
      String operator=request.getParameter("operator");
      String operator1=request.getParameter("operator1");
      String number1=request.getParameter("number1");
      String number2=request.getParameter("number2");
  
    int a=Panduan.panduan1(number1);
      int b=Panduan.panduan2(number2);
      
      int c=2;
      if(operator.equals("是"))
      {
          c=1;
      }
      
      if(operator1.equals("整数"))
      {
          Suan xx[]=new Suan[10];
        int wei=b;
        int shu=a;
        
        String pp="";
        String pp1="";
        Sql.lianjie();
        Sql.delete();
        for(int i=0;i<10;i++){
            xx[i]=new Suan();
            xx[i].getfanwei(wei);
            xx[i].getshu(shu);
            xx[i].shengcheng(c);
            pp=xx[i].show();
            pp1=xx[i].showjieguo().dai();
            out.print(xx[i].showshizi()+"=  ");
            //out.print(xx[i].showdaan());
            out.print("<input type=text id=text1 name=name"+i+">");
            out.print("<p>");
            Sql.insert(i+1,xx[i].showshizi(),xx[i].showdaan());
        }
        Sql.guan();
      }
      
      else
      {
          request.setCharacterEncoding("utf-8");
          Fenshude xx[]=new Fenshude[10];
        int wei=b;
        int shu=a;
        
        String pp="";
        String pp1="";
        Sql.lianjie();
        Sql.delete();
        for(int i=0;i<10;i++){
            xx[i]=new Fenshude();
            xx[i].getfanwei(wei);
            xx[i].getshu(shu);
            xx[i].shengcheng(c);
            //pp=xx[i].show();
            //pp1=xx[i].showjieguo().dai();
            out.print(xx[i].showshizi()+"=  ");
            //out.print(xx[i].showdaan());
            out.print("<input type=text id=text1 name=name"+i+">");
            out.print("<p>");
            Sql.insert(i+1,xx[i].showshizi(),xx[i].showdaan());
        }
        Sql.guan();
      
      }
      //out.print(a+"<p>");
      //out.print(b+"<p>");
      
    %>
   <input type=submit name=submit value=提交 >
   </form>
  </body>
</html>

judge.jsp

<%@ page language="java" import="java.util.*" import ="java.sql.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@page import="entity.*"%>
<%@page import="sql.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>判断答案</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
    <%
    request.setCharacterEncoding("utf-8");
        Statement stmt=null;
        Connection con=null;
        try{
            Class.forName("com.mysql.jdbc.Driver");
            con=DriverManager.getConnection("jdbc:mysql://127.0.0.1/web_number","root","baohui");
            stmt=con.createStatement();
            //out.print("数据库连接成功");
            //out.print("<p>");
        }
        catch(Exception e)
        {
            out.print(e);
        }
    
    //Sql.lianjie();
    String sql="select * from web";
    ResultSet rs=stmt.executeQuery(sql);
        for(int i=0;i<10;i++)
        {
            //sql语句执行
            int number=0;
            String shizi=null;
            String jieguo=null;
            if(rs.next())
            {
                number=rs.getInt("number");
                shizi=rs.getString("shizi");
                jieguo=rs.getString("jieguo");
            }
            
            //进行比较，判断对错
            out.print(shizi+"=    ");
            String  name=request.getParameter("name"+i);
            out.print(name);
            String name1=jieguo;
            
            if(name.equals(name1))
            {
                out.print("        ");
                out.print("<font color=greeen face=楷体>正确</font>");
            }
            else
            {
                out.print("        ");
                out.print("<font color=red face=楷体>错误</font>");
            }
            out.print("<p>");
        }
        stmt.close();
        con.close();
     %>
  </body>
</html>

select.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>选择参数</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
    <form id=form2 method=post action="index.jsp">
    <table align=center border=0>
    <tr>
        <td>是否需要乘除:<td>
        <td>是 <input type=radio name=operator value="是" checked>
                否 <input type=radio name=operator value="否"></td>
    </tr>
    <tr>
        <td>选择整数还是分数:<td>
        <td>整数<input type=radio name=operator1 value="整数" checked>
               分数<input type=radio name=operator1 value="分数"></td>
    </tr>
    <tr>
        <td>运算符的个数：<td>
        <td><select name=number1 size=1>
                <option>2</option>
                <option>3</option>
                <option>4</option>
                <option>5</option>
            </select>
        </td>
    </tr>
    <tr>
        <td>请选择运算范围:<td>
        <td>
            <select name=number2 size=1>
                <option>10</option>
                <option>50</option>
                <option>100</option>
            </select>
        </td>
    </tr>
    <tr>
    <td><input type=submit name=submit value=下一步 ></td>
    </tr>
    </table>
    </form>  
    </body>
</html>

运行结果截图：

总结体会：

首先，由于题目要求比较多，所以在编程之前的设计思路是非常重要的，将需要封装的封装为类，相应的一些功能函数应当写成函数以便后面可以灵活的调用；计算结果的过程利用的是递归的方法，此处是把握了每次计算的规律，找到相似的地方，在递归函数的实现上，起初总是没结果，后来发现没有传递回来值，所以递归中返回值也是很重要的；在数据库的连接时，需要注意jdbc的.jar文件的配置，否则数据库会驱动失败（比较容易遗漏）；在jsp中使用循环结构生成式子的时候，因为要留出答题的文本框，所以在循环需要注意每输出一个式子，相应的输出一个文本框，这里主要答题方便，使界面更具有美观性，操作性；在jsp传递参数过程中涉及到类型转换，需要注意；用javabean来封装类使得思路比较清晰，结构框架清楚，把java代码实现的语句大部分写到.java文件中，而在.jsp文件中主要写传参以及界面的设计，使得思路更具有逻辑性。

psp表