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
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