今天写了题目正误判断的页面：
<%@ page language="java" import="java.util.*" import="java.text.*" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Now here is the result</title>
</head>
<body style="text-align:center;">
<%!
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;
}
%>
<br><br><br>答题结果<br><br><br>
<% int numT=Integer.parseInt(request.getParameter("size"));int s=0,i=0;%>
<%
String xor=(String)session.getAttribute("numR");
if(xor!=null)
{s=Integer.parseInt(xor);}
for(i=0;i<numT;i++){
String str=(String)session.getAttribute("suanshi"+i);
String answer=request.getParameter(""+i);
String keka=getzongde(str);
out.print("第"+(i+1)+"题："+str+"="+keka);
%>
<%
if(answer.equals(keka)){
%>
————————正确（√）
<%}
else{%>
————————错误（×）
<%session.setAttribute(("cuoti"+s),str);s++;%>
<%} %>
<br>
<%}%>
<br><br>
本次做题的得分（百分制）为：<%out.print(String.format("%.2f",(double)(i-s)/((double)i)*100)); %>
<%session.setAttribute("numR",""+s);%>
<br><br>
<form name="form1" action="indes.jsp" method="post">
<input type="submit" value="回到主页面">
</form>
<br>
<form name="form2" action="Damit.jsp" method="post">
<input type="submit" value="错题本">
</form>
<br><br><br>
</body>
</html>
运行结果：
