今天开始写个Javaweb吧
我把四则运算的出题界面写成了web，运行一下发现真的行哦
虽然还没做出答题的审核页面，但毕竟是网站嘛，这就是个重大突破啦
这时第一个页面（设定相关参数页面）
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>Four operations</title>
</head>
<body style="text-align:center;">
<br>
<form name="form1" action="Question.jsp" method="post">
<br><br>
<input type="radio" name="degree" value="0">自己设置
<input type="radio" name="degree" value="1" checked>2年级版本
<input type="radio" name="degree" value="2">3年级版本
<input type="radio" name="degree" value="3">4年级版本
如果您没有选择"自己设置"选项，请跳过下面的设置选项
<br><br>
问题数 <input type="text" name="selfn">
<br><br>
最大值 <input type="text" name="selfma">
<br><br>
最小值 <input type="text" name="selfmi">
<br><br>
如果您的输入不合规则，我们会采用默认参数啦
<br><br>
<input type="submit" value="Let us go!">
</form>
<form name="form2" action="Damit.jsp" method="post">
<input type="submit" value="错题本">
</form>
<br><br>
</body>
</html>
然后第二个页面：出题页面
<%@ page language="java" import="java.util.*" import="java.text.*" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Go!Go!Go!</title>
</head>
<body style="text-align:center;" >
<%
String chooce=request.getParameter("degree");
String tmax=request.getParameter("selfma") ;
String tmin=request.getParameter("selfmi") ;
String tnum=request.getParameter("selfn") ;
Random rand = new Random();
int numT=30,numU=2,max=10,min=99;
String dop=null;
if(chooce.equals("1"))
{
numU=2;
max=100;min=0;
}
else if(chooce.equals("2"))
{
numU=4;
max=100;min=0;
}
else if(chooce.equals("3"))
{
numU=5;
max=100;min=0;
}
if(chooce.equals("0"))
{
max= Integer.parseInt(tmax);
min= Integer.parseInt(tmin);
numT= Integer.parseInt(tnum);
if((max-min)<=(2*numT))
{
max=100;min=0;numT=30;
}
}
int c=0,p=0,rio=0,sop=0;
String[] suanshi=new String[1000];
for(int i=0;i<numT;i++)
{
p=rand.nextInt(max)-min;
suanshi[i]=""+p;
int sc=0,sd=0;
int error=1;
for(;error==1;) {
error=0;
for(int n=1;n<numU;n++) {
c=rand.nextInt(3);
switch(c)
{
case 0:
rio=rand.nextInt(max-min)+min+2;
if(sc==1)
{suanshi[i]=suanshi[i]+("+"+rio+")");sc=0;}
else
{
int f=rand.nextInt(2);
if((n<=numU-2)&&(f==1)&&(sd==0))
{suanshi[i]=suanshi[i]+("+("+rio+"");sc=1;sd=1;}
else
{suanshi[i]=suanshi[i]+("+"+rio);}
}
sop=rio;
break;
case 1:
rio=rand.nextInt(max-min)+min+2;
if(sc==1)
{suanshi[i]=suanshi[i]+("-"+rio+")");sc=0;}
else
{
int f=rand.nextInt(2);
if((n<=numU-2)&&(f==1)&&(sd==0))
{suanshi[i]=suanshi[i]+("-("+rio+"");sc=1;sd=1;}
else
{suanshi[i]=suanshi[i]+("-"+rio);}
}
sop=rio;
break;
case 2:
rio=rand.nextInt(max-min)+min+2;
if(sc==1)
{suanshi[i]=suanshi[i]+("*"+rio+")");sc=0;}
else
{
int f=rand.nextInt(2);
if((n<=numU-2)&&(f==1)&&(sd==0))
{suanshi[i]=suanshi[i]+("*("+rio+"");sc=1;sd=1;}
else
{suanshi[i]=suanshi[i]+("*"+rio);}
}
sop=rio;
break;
case 3:
rio=rand.nextInt(max-min)+min+2;
try {
for(;(sop<rio)||(sop%rio!=0);)
{rio=rand.nextInt(max-min)+min;}
}catch(ArithmeticException e) {
rio=1;
}
if(sc==1)
{suanshi[i]=suanshi[i]+("/"+rio+")");sc=0;}
else
{
int f=rand.nextInt(2);
if((n<=numU-2)&&(f==1)&&(sd==0))
{suanshi[i]=suanshi[i]+("/("+rio+"");sc=1;sd=1;}
else
{suanshi[i]=suanshi[i]+("/"+rio);}
}
sop=rio;
break;
}
}
try
{
dop=getzongde(suanshi[i]);
if(dop.contains("."))
{suanshi[i]=""+p;error=1;}
} catch (Exception e)
{suanshi[i]=""+p;error=1;}
}
}
%>
<%!
public static String getzongde(String str){
String kuohao=getkuohao(str);
String chengchu=getchengchu(kuohao);
String jiajian=getjiajian(chengchu);
return jiajian;
}
public static String getkuohao(String str){
String newstr=str;
if(newstr.contains("(")){
int a=str.lastIndexOf("(");
String str1=str.substring(a,str.length());
int b =str1.indexOf(")");
String str2=str1.substring(1,b);
String chengchu=getchengchu(str2);
String jiajian=getjiajian(chengchu);
StringBuffer s=new StringBuffer(str);
newstr=s.replace(a, a+b+1, jiajian).toString();
return getkuohao(newstr);
}
return newstr;
}
public static String getchengchu(String str){
String newstr=str;
if(str.contains("*")||str.contains("/")){
String str2[]=str.split("[*/+-]");//
String str3=str.replaceAll("\\d+","").replaceAll("\\.","");
int a=0,b=0,c=0,star=0;
if(str3.contains("*")&&str3.contains("/")){
a=str3.indexOf("*");
b=str3.indexOf("/");
if(a>b){
c=b;
star=str.indexOf("/");
}else{
c=a;
star=str.indexOf("*");
}
}else if(str3.contains("*")){
c=str3.indexOf("*");
star=str.indexOf("*");
}else{
c=str3.indexOf("/");
star=str.indexOf("/");
}
String num=getsuanshi(str2[c]+str3.charAt(c)+str2[c+1]);
StringBuffer s=new StringBuffer(str);
int kaishi=star-str2[c].length(),jieshu=star+str2[c+1].length()+1;
StringBuffer strs=s.replace(kaishi,jieshu ,num);
newstr=strs.toString();
return getchengchu(newstr);
}
return newstr;
}
public static String getjiajian(String str){
String newstr=str;
if(str.contains("+")||str.contains("-")){
String str2[]=str.split("[*/+-]");
String str3=str.replaceAll("\\d+","").replaceAll("\\.","");
int a=0,b=0,c=0,star=0;
if(str3.contains("+")&&str3.contains("-")){
a=str3.indexOf("+");
b=str3.indexOf("-");
if(a>b){
c=b;
star=str.indexOf("-");
}else{
c=a;
star=str.indexOf("+");
}
}else if(str3.contains("+")){
c=str3.indexOf("+");
star=str.indexOf("+");
}else{
c=str3.indexOf("-");
star=str.indexOf("-");
}
String num=getsuanshi(str2[c]+str3.charAt(c)+str2[c+1]);
StringBuffer s=new StringBuffer(str);
int kaishi=star-str2[c].length(),jieshu=star+str2[c+1].length()+1;
StringBuffer strs=s.replace(kaishi,jieshu ,num);
newstr=strs.toString();
return getjiajian(newstr);
}
return newstr;
}
public static String getsuanshi(String str){
double c=0.0;
String str2[];
if(str.contains("+")){
str2=str.split("[+]");
c=getjia(Double.parseDouble(str2[0]),Double.parseDouble(str2[1]));
}else if(str.contains("-")){
str2=str.split("[-]");
c=getjian(Double.parseDouble(str2[0]),Double.parseDouble(str2[1]));
}else if(str.contains("*")){
str2=str.split("[*]");
c=getcheng(Double.parseDouble(str2[0]),Double.parseDouble(str2[1]));
}else if(str.contains("/")){
str2=str.split("[/]");
c=getchu(Double.parseDouble(str2[0]),Double.parseDouble(str2[1]));
}
NumberFormat format=NumberFormat.getInstance();
format.setMaximumFractionDigits(30);
format.setMinimumFractionDigits(0);
format.setGroupingUsed(false);
return format.format(c);
}
public static Double getjia(double a,double b){
double c=a+b;
return c;
}
public static Double getjian(double a,double b){
double c=a-b;
return c;
}
public static Double getcheng(double a,double b){
double c=a*b;
return c;
}
public static Double getchu(double a,double b){
double c=a/b;
return c;
}
%>
<form name="form1" action="Rider.jsp" method="post">
共<input type="text" name="size" size="1" value="<%=numT%>" readonly>题
<br><br>
<%for(int i=0;i<numT;i++){ %>
<tr>
<% out.print("第"+(i+1)+"题：");out.print(suanshi[i]); %>
<br>
</tr>
<%session.setAttribute(("suanshi"+i),suanshi[i]);%>
<input type="text" name=<%=i%>><br><br>
<%} %>
<input type="submit" value="我做完啦！">
</form>
<br><br><br>
</body>
</html>
运行效果：
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