结对队友：胡康臻，杨寒寒
1、设计思想：先编写javabean，在javabean中实现四则运算，并把生成的表达式和答案写入数据库；接下来写四则运算用户选择界面，针对用户的选择，编写处理界面，表达式输出界面，核对答案界面
2、源代码：
四则运算javabean：
package 四则运算4;
import java.sql.*;
public class T {
//只有整数运算
public void zhengshu(int num,int num_max) throws Exception
{
System.out.println("整数四则运算：");
String biaodashi;
String result = null;
//清空数据表
Connection conn=null;
try{
//连接驱动
Class.forName("com.mysql.jdbc.Driver");
System.out.println("成功加载Mysql驱动");
//数据库操作
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mldn","root","hanhan");
Statement stmt = conn.createStatement();
//清空数据表
String sql;
sql="truncate table zhengshu";
stmt.execute(sql);
}
catch(SQLException e1)
{
System.out.println("Mysql操作错误");
e1.printStackTrace();
}
catch(Exception e1)
{
e1.printStackTrace();
}
for(int i = 0;i<num;i++){
//获得两个数
int x =1+ (int)(Math.random()*num_max);
int y = 1+(int)(Math.random()*num_max);
//随机获得符号
int fuhao = 1+(int)(Math.random()*4);
//加法运算
if(fuhao == 1)
{
biaodashi = x+ " + " +y;
result = String.valueOf(x+y);
}
//减法运算并检验结果无负数
else if(fuhao == 2)
{
if(x<y)
{
biaodashi = y+ " - " +x;
result = String.valueOf(y-x);
}
else
{
biaodashi = x+ "-" +y;
result = String.valueOf(x-y);
}
}
//乘法运算
else if(fuhao ==3)
{
biaodashi = x+ " * " +y;
result = String.valueOf(x*y);
}
//除法运算并判断结果有无余数
else
{
while(y==0)
{
y = 1+(int)(Math.random()*10);
}
biaodashi = x+ " / " +y;
result = fenshu_print(x,y);
System.out.println(result);
}//else结束
conn = null;
try{
//连接驱动
Class.forName("com.mysql.jdbc.Driver");
System.out.println("成功加载Mysql驱动");
//数据库操作
conn = null;
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mldn","root","hanhan");
Statement stmt = conn.createStatement();
String sql;
sql = "insert into zhengshu(biaodashi,answer) values('"+biaodashi+"','"+result+"')";
stmt.executeUpdate(sql);
}
catch(SQLException e)
{
System.out.println("Mysql操作错误");
e.printStackTrace();
}
catch(Exception e)
{
e.printStackTrace();
}
finally{
conn.close();
}
}
}
//分数化简
public static int huajian(int a,int b)
{
int m = a;
if(m<b)
m = b;
int i = 0;
for(i=m;i>1;i--)
{
if(a%i==0&&b%i==0)
break;
}
return i;
}
//整数球结果
public static int integer(int num1,int num2,int fuhao)
{
if(fuhao == 0)
fuhao = num1 + num2;
else if(fuhao == 1)
if(num1 >num2)
{
fuhao = num1 - num2;
}
else
fuhao = num2 - num1;
else if(fuhao == 2)
fuhao = num1 * num2;
return fuhao;
}
//分数输出
public static String fenshu_print(int x,int y)
{
String result = null;
if(x>y&&x%y!=0)
{
result = x/y + "’" + (x/huajian(x,y))%(y/huajian(x,y)) + "/" + y/huajian(x,y);
}
else if(x<y)
{
result = x/huajian(x,y) + "/" + y/huajian(x,y);
}
else if(x%y==0)
result = String.valueOf(x/y);
return result;
}
//分数运算
public void fenshu(int num,int num_max) throws Exception
{
System.out.println("分数四则运算：");
String biaodashi;
String result = null;
//清空数据表
Connection conn=null;
try{
//连接驱动
Class.forName("com.mysql.jdbc.Driver");
System.out.println("成功加载Mysql驱动");
//数据库操作
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mldn","root","hanhan");
Statement stmt = conn.createStatement();
//清空数据表
String sql;
sql="truncate table fenshu";
stmt.execute(sql);
}
catch(SQLException e1)
{
System.out.println("Mysql操作错误");
e1.printStackTrace();
}
catch(Exception e1)
{
e1.printStackTrace();
}
for(int i = 0;i<num;i++){
//获得两个数
int a =1+ (int)(Math.random()*num_max);
int b = 1+(int)(Math.random()*num_max);
int c = 1+(int)(Math.random()*num_max);
int d = 1+(int)(Math.random()*num_max);
int fuhao = 1+(int)(Math.random()*4);
String fu = null;
if(fuhao ==1)
fu = "+";
else if(fuhao ==2)
fu = "-";
else if(fuhao==3)
fu = "*";
else
fu = "/";
biaodashi = a+"/"+b+" "+fu+" "+c+"/"+d;
result = fenshu_result(a,b,c,d,fuhao);
conn = null;
try{
Class.forName("com.mysql.jdbc.Driver");
System.out.println("成功加载Mysql驱动");
//数据库操作
conn = null;
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mldn","root","hanhan");
Statement stmt = conn.createStatement();
String sql;
sql = "insert into fenshu(biaodashi,answer) values('"+biaodashi+"','"+result+"')";
stmt.execute(sql);
}
catch(SQLException e)
{
System.out.println("Mysql操作错误");
e.printStackTrace();
}
catch(Exception e)
{
e.printStackTrace();
}
finally{
conn.close();
}
}
}
//分数求结果
public static String fenshu_result(int a,int b,int c,int d,int fuhao)
{
String result = null;
if(fuhao == 1)
{
result = fenshu_print(a*d+b*c,b*d);
}
else if(fuhao == 2)
{
if(a*d-b*c>0)
result = fenshu_print(a*d-b*c,b*d);
else
result = "-"+fenshu_print(a*d-b*c,b*d);
}
else if(fuhao == 3)
result = fenshu_print(a*c,b*d);
else
result = fenshu_print(a*d,b*c);
return result;
}
public void kuohao(int number,int num_max) throws Exception
{
//清空数据表
Connection conn=null;
try{
//连接驱动
Class.forName("com.mysql.jdbc.Driver");
System.out.println("成功加载Mysql驱动");
//数据库操作
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mldn","root","hanhan");
Statement stmt = conn.createStatement();
//清空数据表
String sql;
sql="truncate table kuohao";
stmt.execute(sql);
}
catch(SQLException e1)
{
System.out.println("Mysql操作错误");
e1.printStackTrace();
}
catch(Exception e1)
{
e1.printStackTrace();
}
for(int ti = 0;ti<number;ti++){
int x=(int) (1+(Math.random()*num_max));
int y=0;//符号随机
int j;//寻找（
int p;//确定）的位置
int e=0;//确定表达式中是否有右括号
int a = 10;
String f = null ;
String biaodashi = x+"";
String result = null;
int num = 8;
for(int i = 0;i<5-1;i++){
y = (int)(1+(Math.random()*num));
if(y==1)
f = "+";
else if(y==2)
f = "-";
else if(y==3)
f = "*";
else if(y==4)
f = "/";
else if(y==5)
f = "+(";
else if(y==6)
f = "-(";
else if(y==7)
f = "*(";
else if(y==8)
f = "/(";
biaodashi = biaodashi+ f + x ;
x=(int)(1+(Math.random()*num_max));
//控制左括号
if(y>4)
{
num = 4;
a = i;
}
else if(4-i>0)
num = 4;
//控制右括号
if(i-a>=1&&e==0)
{
p=(int)(1+(Math.random()*2));
if(p==1)
biaodashi+="";
else
{
biaodashi+=")";
e=1;
}
}
}
for(int q = 0;q<biaodashi.length();q++){
if(biaodashi.charAt(q)=='(')
for(int w = q;w<biaodashi.length();w++)
if(biaodashi.charAt(w)==')')
break;
else
{
if(w==biaodashi.length()-1)
biaodashi+=")";
}
}
result = String.valueOf(opt(biaodashi));
conn=null;
try{
//连接驱动
Class.forName("com.mysql.jdbc.Driver");
System.out.println("成功加载Mysql驱动");
//数据库操作
conn = null;
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mldn","root","hanhan");
Statement stmt = conn.createStatement();
String sql;
sql = "insert into kuohao(biaodashi,answer) values('"+biaodashi+"','"+result+"')";
stmt.execute(sql);
}
catch(SQLException e1)
{
System.out.println("Mysql操作错误");
e1.printStackTrace();
}
catch(Exception e1)
{
e1.printStackTrace();
}
finally{
conn.close();
}
}
}
public static float opt(String s) throws Exception{
if(s == null || "".equals(s.trim())) {
return 0f;
}
int a1=s.indexOf("+");
int a2=s.indexOf("-");
int a3=s.indexOf("*");
int a4=s.indexOf("/");
int a5=s.indexOf("(");
if(a1==-1&&a2==-1&&a3==-1&&a4==-1){
if(s.trim()==null||"".equals(s.trim())){
throw new Exception("operate error");
}
return Float.parseFloat(s.trim());
}
if(a5!=-1){
int a6=s.indexOf(")");
if(a6==-1){
throw new Exception("括号不匹配");
}else{
float f=opt(s.substring(a5+1,a6).trim());
s=s.replace(s.substring(a5,a6+1), String.valueOf(f));
return opt(s);
}
}
if(a1!=-1){
return opt(s.substring(0,a1))+opt(s.substring(a1+1,s.length()));
}
if(a2!=-1){
return opt(s.substring(0,a2))-opt(s.substring(a2+1,s.length()));
}
if(a3!=-1){
return opt(s.substring(0,a3))*opt(s.substring(a3+1,s.length()));
}
if(a4!=-1){
return opt(s.substring(0,a4))/opt(s.substring(a4+1,s.length()));
}
return Integer.parseInt(s.trim());
}
private int num;
private int max;
private int if_fenshu;
private int if_kuohao;
}
用户选择界面：
<!-- js验证输入是否正确 --> <!DOCTYPE html> <html> <head> <script language = "JavaScript"> function fun(form) { max = form.max.value; num = form.num.value; if(num.length==0) { alert("请输入题的数量"); form.num.focus(); return false; } else if(max.length==0) { alert("请输入数值范围"); form.max.focus(); return false; } } </script> <meta charset="UTF-8"> <title>请选择题型</title> </head> <body> <h2 align = "center">请做选择</h2> <form name = "form1" action = "confirm.jsp" method = "post" name = "mychose" onsubmit = " return fun(form1)"> <table align = "center"> <tr> <td>题数：</td> <td><input type ="text" name = "num" value = ""></td> </tr> <tr> <td>数值范围：</td> <td><input type = "text" name = "max" value = ""></td> </tr> <tr> <td>是否有分数：</td> <td><input type = "radio" name = "checked_fenshu" value = "1" checked>有分数</td> <td><input type = "radio" name = "checked_fenshu" value = "2">没有分数</td> </tr> <tr> <td>是否有括号：</td> <td><input type = "radio" name = "checked_kuohao" value = "1" checked>有括号</td> <td><input type = "radio" name = "checked_kuohao" value = "2">没有括号</td> </tr> <tr> <td> <input type="reset" value="重置"></td> <td> <input type="submit" value="开始做题" ></td> </tr> </table> </form> </body> </html>
处理界面：
<%@ page language="java" import = "java.sql.*" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@ page import = "四则运算4.T" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>确认信息 </title> </head> <body> <% request.setCharacterEncoding("utf-8"); int num = Integer.parseInt(request.getParameter("num")); int num_max = Integer.parseInt(request.getParameter("max")); int checked_fenshu = Integer.parseInt(request.getParameter("checked_fenshu")); int checked_kuohao = Integer.parseInt(request.getParameter("checked_kuohao")); out.println(num+" "+num_max+" "+checked_fenshu+" "+checked_kuohao); T t = new T(); if(checked_fenshu==2&&checked_kuohao==2) t.zhengshu(num, num_max); else if(checked_fenshu==1&&checked_kuohao==2) { t.zhengshu(num/2, num_max); t.fenshu(num-num/2, num_max); } else if(checked_fenshu==2&&checked_kuohao==1) { t.zhengshu(num/2, num_max); t.kuohao(num-num/2, num_max); } else { t.zhengshu(num/3, num_max); t.fenshu(num/3, num_max); t.kuohao(num-num/3*2, num_max); } %> <jsp:forward page = "print.jsp"></jsp:forward> </body> </html>
表达式输出界面：
<%@ page language="java" import = "java.sql.*" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>请开始做题</title>
</head>
<style type="text/css">
.text1{100px; height:20px}
</style><style type="text/css">
.text1{100px; height:20px}
</style>
<body><form action = "check.jsp">
<table align = "center" >
<tr><td>表达式</td><td >答案</td>
<%
Connection conn=null;
try{
//连接驱动
Class.forName("com.mysql.jdbc.Driver");
System.out.println("成功加载Mysql驱动");
//数据库操作
conn = null;
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mldn","root","hanhan");
Statement stmt = conn.createStatement();
String sql;
sql = "select biaodashi from zhengshu";
ResultSet rs=stmt.executeQuery(sql); //执行查询语句
//从结果集中读取各字段并输出
int i = 0;
while(rs.next())
{i++;
out.println("<tr><td>"+rs.getString(1));
%>
<td><input type = "text" name = "text<%=i%>" class = "text1"></td>
<%
}
sql = "select biaodashi from fenshu";
rs=stmt.executeQuery(sql); //执行查询语句
//从结果集中读取各字段并输出
while(rs.next())
{i++;
out.println("<tr><td>"+rs.getString(1));
%>
<td><input type = "text" name = "text<%=i%>" class = "text1"></td>
<%
}
sql = "select biaodashi from kuohao";
rs=stmt.executeQuery(sql); //执行查询语句
//从结果集中读取各字段并输出
while(rs.next())
{
out.println("<tr><td>"+rs.getString(1));
%>
<td><input type = "text" name = "text<%=i%>" class = "text1"></td>
<%
}
}
catch(SQLException e1)
{
System.out.println("Mysql操作错误");
e1.printStackTrace();
}
catch(Exception e1)
{
e1.printStackTrace();
}
finally{
conn.close();
}
%>
<tr><td><input type = "reset" value = "重置" ></td>
<td><input type = "submit" value = "提交"</td></tr>
</table>
</body>
</html>
答案处理界面
<%@ page language="java" import = "java.sql.*" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
out.println(request.getParameter("text"+1));
Connection conn=null;
try{
//连接驱动
Class.forName("com.mysql.jdbc.Driver");
System.out.println("成功加载Mysql驱动");
//数据库操作
conn = null;
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mldn","root","hanhan");
Statement stmt = conn.createStatement();
String sql;
int zhengshu_num=0,fenshu_num = 0,kuohao_num = 0;
String int_an[] = new String[100];
String fen_an[] = new String[100];
String kuo_an[] = new String[100];
//查询整数的个数
sql = "select answer from zhengshu";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next())
{
zhengshu_num++;
int_an[zhengshu_num] = rs.getString(1);
}
out.println(zhengshu_num);
//查询分数的个数
sql = "select answer from fenshu";
rs=stmt.executeQuery(sql);
while(rs.next())
{
fenshu_num++;
fen_an[fenshu_num] = rs.getString(1);
}
//查询括号的个数
sql = "select answer from kuohao";
rs=stmt.executeQuery(sql);
while(rs.next())
{
kuohao_num++;
kuo_an[kuohao_num] = rs.getString(1);
}
int dui[] = new int[zhengshu_num+fenshu_num+kuohao_num];
int cuo[] = new int[zhengshu_num+fenshu_num+kuohao_num];
int dui_num = 0;
int cuo_num = 0;
String daan[] = new String[100];
for(int i = 1;i<=zhengshu_num;i++)
{
daan[i] = request.getParameter("text"+i);
out.println(daan[i]);
if(int_an[i].equals(daan[i]))
{
dui[dui_num] = i;
dui_num++;
}
else
{
cuo[cuo_num] = i;
cuo_num++;
}
}
for(int i = 1;i<=fenshu_num;i++)
{
daan[i] = request.getParameter("text"+i+zhengshu_num);
if(fen_an[i].equals(daan[i]))
{
dui[dui_num] = i+zhengshu_num;
dui_num++;
}
else
{
cuo[cuo_num] = i+zhengshu_num;
cuo_num++;
}
}
for(int i = 1;i<=kuohao_num;i++)
{
daan[i] = request.getParameter("text"+i+zhengshu_num+fenshu_num);
if(kuo_an[i].equals(daan[i]))
{
dui[dui_num] = i+zhengshu_num+fenshu_num;
dui_num++;
}
else
{
cuo[cuo_num] = i+zhengshu_num+fenshu_num;
cuo_num++;
}
}
%><br><%
out.println("做错的题目有：");
for(int i = 0;i<cuo_num;i++)
{
if(i==cuo_num-1)
out.println(cuo[i]);
else
out.println(cuo[i]+",");
}
out.println("做对的题目有：");
for(int i = 0;i<dui_num;i++)
{
if(i==dui_num-1)
{
out.println(dui[i]);
}
else
out.println(dui[i]+",");
}
}
catch(Exception e)
{
e.printStackTrace();
}
%>
</body>
</html>
程序结果截图
