出题系统（网页版）
（1）思路：文本输入在一个jsp的文本框中，将需赋值的变量在此jsp中均完成，跳转下一个jsp,利用<% %>,将java代码输入，将已赋值的变量，用request.getParameter赋值到String类型的变量中，在强制转化成int,利用if完成整数和真分数的四则运算。
（2）代码：
第一个jsp:
<%@ page language="java" 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=ISO-8859-1">
<title>出题系统</title>
</head>
<body >
<h2>出题系统</h2>
<form action="check.jsp" method="post">
出题数量：<input type="text" name = "username"><br>
<h2>题目样式：1.整数四则运算 2.真分数四则运算</h2>
题目样式：<input type="text" name="choose"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
第二个jsp:
<%@ page language="java" import="java.sql.*" import="java.util.*" 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>登录</title>
</head>
<body>
<%
JspWriter mout=pageContext.getOut();
String us = request.getParameter("username");
String ch = request.getParameter("choose");
int num = Integer.parseInt(us);
int cho = Integer.parseInt(ch);
if(cho == 1)
{
mout.print(num+"道整数题目");
mout.print("<br>");
String[] str = new String[num+1];
str[0]="";
for(int i=1;i<=num;i++)
{
String ss="";
int state = 0;
int intVal3 = (int)(Math.random()*4+1);
int intVal1 = 0;
int intVal2 = 0;
while(state == 0)
{
intVal1 = (int)(Math.random()*100+1);
intVal2 = (int)(Math.random()*100+1);
ss = intVal1+""+intVal2;
for(int j=0;j<i;j++)
{
if(ss.equals(str[i-1]))
state=0;
else
{
state=1;
str [i]=intVal1+""+intVal2;
}
}
}
mout.print(i+" 、 ");
if(intVal3==1){
mout.print(intVal1);
mout.print(" + ");
mout.print(intVal2);
mout.print("= ?");
mout.print("<br>");
}
if(intVal3==2){
mout.print(intVal1);
mout.print(" - ");
mout.print(intVal2);
mout.print("= ?");
mout.print("<br>");
}
if(intVal3==3){
mout.print(intVal1);
mout.print(" * ");
mout.print(intVal2);
mout.print("= ?");
mout.print("<br>");
}
if(intVal3==4){
mout.print(intVal1);
mout.print(" ÷ ");
mout.print(intVal2);
mout.print("= ?");
mout.print("<br>");
}
}
}
if(cho == 2)
{
mout.print(num+"道真分数题目");
mout.print("<br>");
String[] st = new String[num+1];
st[0]="";
for(int i=1;i<=num;i++)
{
int num1 = 0;
int num2 = 0;
int num3 = 0;
int num4 = 0;
String ss="";
String ss1="";
String ss2="";
int state = 0;
int intVal3 = (int)(Math.random()*4+1);
while(state == 0)
{
while(num1==num2)
{
num1 = (int)(Math.random()*100+1);num2 = (int)(Math.random()*100+1);
if(num1<num2)
{
ss1=num1+"/"+num2;
}
else
{
ss1=num2+"/"+num1;
}
}
while(num3==num4)
{
num3 = (int)(Math.random()*100+1);num4 = (int)(Math.random()*100+1);
if(num3<num4)
{
ss2=num3+"/"+num4;
}
else
{
ss2=num4+"/"+num3;
}
}
ss =ss1+ss2;
for(int j=0;j<i;j++)
{
if(ss.equals(st[i-1]))
state=0;
else
{
state=1;
st [i]=ss1+ss2;
}
}
}
mout.print(i+" 、 ");
if(intVal3==1){
mout.print(ss1);
mout.print(" + ");
mout.print(ss2);
mout.print("= ?");
mout.print("<br>");
}
if(intVal3==2){
mout.print(ss1);
mout.print(" - ");
mout.print(ss2);
mout.print("= ?");
mout.print("<br>");
}
if(intVal3==3){
mout.print(ss1);
mout.print(" * ");
mout.print(ss2);
mout.print("= ?");
mout.print("<br>");
}
if(intVal3==4){
mout.print(ss1);
mout.print(" ÷ ");
mout.print(ss2);
mout.print("= ?");
mout.print("<br>");
}
}
}
%>
</body>
</html>
(3)结果：
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