四则运算 web

https://git.oschina.net/acehshh/si.git

一、需求分析

记录用户的对错总数，程序退出再启动的时候，能把以前的对错数量保存并在此基础上增量计算。
有计时功能，能显示用户开始答题后的消耗时间。
界面支持中文简体/中文繁体/英语，用户可以选择一种；

二、查询设计

三、代码

l="";
int b=0;
String s = null;
int x=1+(int)(Math.random()*9);
int x2=(int)(Math.random()*4);
switch(x2){
case 0:s="-";break;
case 1:s="+";break;
case 2:s="*";break;
case 3:s="/";break;
}
l1=s;
int x3=1+(int)(Math.random()*9);
l=l+x+s+x3;
int x4=(int)(Math.random()*4);
switch(x4){
case 0:s="-";break;
case 1:s="+";break;
case 2:s="*";break;
case 3:s="/";break;
}
l2=s;
int x5=1+(int)(Math.random()*9);
l=l+s+x5;
int x6=(int)(Math.random()*4);
switch(x6){
case 0:s="-";break;
case 1:s="+";break;
case 2:s="*";break;
case 3:s="/";break;
}
l3=s;
int x7=1+(int)(Math.random()*9);
l=l+s+x7;//产生随机题目
a1=x;
a2=x3;
a3=x5;
a4=x7;
p=p+1;
request.setAttribute("diji", p);//显示第几题
System.out.println(l);
request.setAttribute("timu", l);//将题目保留在request让下个页面可以回去timu
request.getRequestDispatcher("/jisuan.jsp").forward(request, response);//转发到jisuan.jsp页面

//难度一，二，三基本一样就不写了

ScriptEngineManager sem = new ScriptEngineManager();
ScriptEngine engine = sem.getEngineByExtension("js");
request.setAttribute("diji", p);
Object p=request.getParameter("daan");
String m1=(String) p;
System.out.println(p);
System.out.println(m1);
Object result1 = null;
try {
result1 = engine.eval(m1);
} catch (ScriptException e) {
request.setAttribute("timu", l);
request.setAttribute("message", "你输入的答案不符合要求，请重新输入");
request.getRequestDispatcher("/cuode.jsp").forward(request, response);
}//用户输入的如果不合要求的处理方法

if(l1.equals("/")&&l3.equals("/")){
if(l2.equals("+")||l2.equals("-")){
l="("+a1+"*"+a4+"+"+a2+"*"+a3+")"+"/"+"("+a3+"*"+a4+")"+"";
}else if(l2.equals("*")){
l="("+a1+"*"+a3+")"+"/"+"("+a2+"*"+a4+")"+"";
}else{
l=a1+"/"+"("+a2+"*"+a3+"*"+a4+")"+"";
}
}
if(l1.equals("/")&&!l3.equals("/")){
if(l2.equals("*")&&l3.equals("+")){
l=a1+"*"+a3+"/"+a2+l3+a4;
}if(l2.equals("*")&&l3.equals("-")){
l="("+a1+l2+a3+l3+a4+l2+a2+")"+l1+a2;
}
if(l2.equals("/")&&l3.equals("*")){
l=a1+l3+a4+l2+"("+a2+"*"+a3+")";
}if(l2.equals("/")&&l3.equals("+")){
l=a1+l1+"("+a2+"*"+a3+")"+l3+a4;
}if(l2.equals("/")&&l3.equals("-")){
l="("+a1+l3+a4+"*"+a2+"*"+a3+")"+l1+"("+a2+"*"+a3+")";
}if(l2.equals("-")&&l3.equals("*")){
l="("+a1+l2+"("+a3+l3+a4+")"+"*"+a2+")"+l1+a2;
}
}
if(l2.equals("/")){
if(l1.equals("-")&&l3.equals("*")){
l="("+a1+l3+a3+l1+a2+l3+a4+")"+l2+a3;
}if(l1.equals("-")&&l3.equals("/")){
l="("+a1+"*"+a3+"*"+a4+l1+a2+")"+l2+a3+"*"+a4;
}if(l1.equals("-")&&l3.equals("+")){
l="("+a1+"*"+a3+l1+a2+")"+l2+a3+l3+a4;
}if(l1.equals("-")&&l3.equals("-")){
l="("+"("+a1+l3+a4+")"+"*"+a3+l1+a2+")"+l2+a3;
}if(l1.equals("*")&&l3.equals("-")){
l="("+a1+l1+a2+l3+a3+l1+a4+")"+l2+a3;
}if(l1.equals("/")&&l3.equals("-")){
l="("+a1+l3+a2+"*"+a3+"*"+a4+")"+l2+"("+a2+"*"+a3+")";
}if(l1.equals("+")&&l3.equals("-")){
l="("+"("+a1+l3+a4+")"+"*"+a3+l1+a2+")"+l2+a3;
}
}
if(l3.equals("/")){
if(l1.equals("-")&&l2.equals("*")){
l="("+a1+l2+a4+l1+a2+l2+a4+")"+l3+a4;
}if(l1.equals("-")&&l2.equals("-")){
l="("+a1+"*"+a4+l1+a2+"*"+a4+")"+l3+a4;
}if(l1.equals("-")&&l2.equals("+")){
l="("+a1+"*"+a4+l1+a2+"*"+a4+")"+l3+a4;
}if(l1.equals("*")&&l2.equals("-")){
l="("+a1+l1+a2+l1+a4+l2+a3+")"+l3+a4;
}
}//遇到除法的处理方式

Object result = null;
try {
result = engine.eval(l);
} catch (ScriptException e1) {
e1.printStackTrace();
}
if(result1.equals(result)){
String m="输入正确"+result;
request.setAttribute("jieguo", m);
k=k+1;
}else{
String m="输入不正确"+result;
request.setAttribute("jieguo", m);
y=y+1;
}//答案的核对

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String servletPath=request.getServletPath();
String methodName=servletPath.substring(1);
methodName=methodName.substring(0, methodName.length()-3);

try {
Method method=getClass().getDeclaredMethod(methodName, HttpServletRequest.class,HttpServletResponse.class);
method.invoke(this, request,response);
} catch (Exception e) {
e.printStackTrace();
}
}

//Servlet内构建方法必须的

time1=request.getSession().getAttribute("kssj");
Object time2=request.getSession().getAttribute("jssj");
String m3="你做对了"+k;
String m4="你做错了"+y;
request.getSession().setAttribute("hh", m3);
request.getSession().setAttribute("hh1", m4);
System.out.println(k);
System.out.println(y);
System.out.println(time1);
System.out.println(time2);

Object y=session.getAttribute("hh");
Object k=session.getAttribute("hh1");

application.setAttribute("zuodui", y);
application.setAttribute("zuocuo", k);

//获取做对和做错的题目和时间，并且用application保留

<%
Date date=new Date();
out.println(date);
session.setAttribute("kssj", date);
%>

//日期的显示
<br><br>
<a href="save.do">难度一</a>
<br><br>
<a href="save1.do">难度二</a>
<br><br>
<a href="save2.do">难度三</a>

//调用Servlet的save,save1,save2的方法

<%
Date date=new Date();
out.println(date);//当前的时间显示
out.println("<br><br>");
Object p=request.getAttribute("diji");//读取第几的信息
out.println("第"+p+"题目");

%>

<br><br>
<form action="jisuan.do">//调用sevelet的jisuan方法
timu:<input type="text" name="timu" value="${requestScope.timu }" />
<br><br>
daan:<input type="text" name="daan" />
<br><br>
jiegou:<input type="text" name="jiegou" value="${requestScope.jieguo }" />
<br><br>
<input type="submit" name="queding" />//一个按钮键的设置
</form>

//定义了3个属性，并且获取了timu和jieguo属性的值

Date date=new Date();
out.println(date);
out.println("<br><br>");

Object p1=request.getAttribute("message");
if(!p1.equals(null)){
out.println(p1);
out.println("<br><br>");
}
Object p=request.getAttribute("diji");
out.println("第"+p+"题目");

//如果输入的答案不合适会显示这个页面并让用户重修输入

Object time=session.getAttribute("jssj");
Object time1=session.getAttribute("kssj");
Date l=(Date)time;
Date l2=(Date)time1;
long l1=(l.getTime()-l2.getTime())/1000;

//时间的计算方法以秒为单位