今天终于把周一布置的课堂测试完成了，说真的，有些困难。
代码如下：
<%@ page import="java.util.Random" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.Scanner" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="ch">
<%!
Random ra=new Random();
static class tools {
public static char getOperator() {
char operator = 0;
Random ran = new Random();
int i = ran.nextInt(4);
switch (i) {
case 0:
operator = '+';
break;
case 1:
operator = '-';
break;
case 2:
operator = '*';
break;
case 3:
operator = '/';
break;
}
return operator;
}//获得运算符
public static int getNumber(int max) {
int number = 0;
Random ran = new Random();
number = ran.nextInt(max + 1);
return number;
}//获得随机数
//根据运算符个数随机得到子节点个数
public static boolean[] getChildPlace(int num) {
int d = 0;
int size = 0, j = 1;
while (num >= (int) Math.pow(2, j)) {
j++;
}
d = (int) Math.pow(2, j) - 1 - num;
size = (int) Math.pow(2, j - 1);
boolean[] k = new boolean[size];
for (int i = 0; i < size; i++) {
k[i] = true;
}
for (int i = 0; i < d; i++) {
Random ran = new Random();
int f = ran.nextInt(size);
while (k[f] == false) {
f = ran.nextInt(size);
}
k[f] = false;
}
return k;
}
public static int getTextClass() {
Scanner sc = new Scanner(System.in);
System.out.print("请选择：");
int num = sc.nextInt();
return num;
}//选择年级
public static int judgeTextdanger() {
Scanner sc = new Scanner(System.in);
System.out.print("请选择是否带乘除（1.是 2.否）：");
int tb = sc.nextInt();
return tb;
}//判断是否带乘除
public static int judgeTextKuo() {
Scanner sc = new Scanner(System.in);
System.out.print("请选择是否带括号（1.是 2.否）：");
int tb = sc.nextInt();
return tb;
}//判断是否带括号（四年级）
public static int getTextNum() {
Scanner sc = new Scanner(System.in);
System.out.print("请输入做题数量：");
int num = sc.nextInt();
return num;
}//获得做题数量
public static int getTextMax(int k) {//k为几年级
Scanner sc = new Scanner(System.in);
if (k == 2)
System.out.print("请选择数值范围(1-100)：");
else if (k == 3)
System.out.print("请选择数值范围(1-1000)：");
else System.out.print("请选择数值范围(1-1000)：");
int tb = sc.nextInt();
return tb;
}//获得操作数范围
public static int getTextOperator(int k) {//k为年级，3/4
Scanner sc = new Scanner(System.in);
if (k == 3)
System.out.print("请选择操作数（2-4）：");
else
System.out.print("请选择操作数（2-5）：");
int tb = sc.nextInt();
return tb;
}//获得操作数的数量
//判断是否完成题目
public static int judgeFinish() {
Scanner sc = new Scanner(System.in);
System.out.print("是否在文件内完成题目（1.是/2.否）：");
int k = sc.nextInt();
return k;
}
}
static class Tree {
private String str;
private Tree lchild;
private Tree rchild;
public Tree(String str){
this.str=str;
}
public Tree(String str,Tree lchild,Tree rchild){
this.str = str;
this.rchild = rchild;
this.lchild = lchild;
}
public void setChild(Tree lchild, Tree rchild){
this.lchild = lchild;
this.rchild = rchild;
}
public String getStr() {
return str;
}
public void setStr(String str) {
this.str = str;
}
public Tree getRchild() {
return rchild;
}
public void setRchild(Tree rchild) {
this.rchild = rchild;
}
public Tree getLchild() {
return lchild;
}
public void setLchild(Tree lchild) {
this.lchild = lchild;
}
//判断是否有左右孩子
public boolean hasChild(){
if(lchild == null && rchild == null)
return false;
else
return true;
}
//获取结果，并检验减法和除法的情况是否合理
public String getResult(){
Random ra=new Random();
if(hasChild()){
switch(str){
case "+":
return String.valueOf(Integer.parseInt(getLchild().getResult()) + Integer.parseInt(getRchild().getResult()));
case "-":
if(Integer.parseInt(getLchild().getResult())<Integer.parseInt(getRchild().getResult())){
int t=ra.nextInt(2);
if(t==0) str="+";
else str="*";
return this.getResult();
}
return String.valueOf(Integer.parseInt(getLchild().getResult()) - Integer.parseInt(getRchild().getResult()));
case "*":
return String.valueOf(Integer.parseInt(getLchild().getResult()) * Integer.parseInt(getRchild().getResult()));
case "/":
if(getRchild().getResult().equals("0")){
while(str.equals("/")){
str = String.valueOf(tools.getOperator());
}
return this.getResult();
}
else if(Integer.parseInt(getLchild().getResult()) % Integer.parseInt(getRchild().getResult()) != 0){
while(str.equals("/")){
str = String.valueOf(tools.getOperator());
}
return this.getResult();
}
else
return String.valueOf(Integer.parseInt(getLchild().getResult()) / Integer.parseInt(getRchild().getResult()));
}
}
return str;
}
//加括号
public String toString(){
String Lstr = "", Rstr = "", Str = "";
if(hasChild()){
if(getRchild().hasChild()){//在运算符为-，*，/时需要添加括号，其余不进行添加括号操作
if(str.equals("/")){
Rstr = getRchild().toString();
}
else if(str.equals("*") || str.equals("-")){
if(getRchild().str.equals("+") || getRchild().str.equals("-")){
Rstr = getRchild().toString();
}
else{
Rstr = getRchild().toString().substring(1, getRchild().toString().length()-1);
}
}
else{
Rstr = getRchild().toString().substring(1, getRchild().toString().length()-1);
}
}
else{
Rstr = getRchild().str;
}
if(getLchild().hasChild()){//和右孩子同理，但此时减号不用添加括号
if(str.equals("*") || str.equals("/")){
if(getLchild().str.equals("+") || getLchild().str.equals("-")){
Lstr = getLchild().toString();
}
else{
Lstr = getLchild().toString().substring(1, getLchild().toString().length()-1);
}
}
else{
Lstr = getLchild().toString().substring(1, getLchild().toString().length()-1);
}
}
else{
Lstr = getLchild().str;
}
Str = "(" + Lstr + str + Rstr + ")";
}
else{
//若没有孩子，说明是数字节点，直接返回数字
Str = str;
}
return Str;
}
}
static class doTree {
private Tree root;
private int num;
private ArrayList<Tree> arr = new ArrayList<Tree>();
public doTree(int num){
this.num=num;
}
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
public Tree getRoot() {
return root;
}
public void setRoot(Tree root) {
this.root = root;
}
//验证表达式是否正确并进行计算
public String TestProblem(){
return root.getResult();
}
//获取最终的式子（需在验证式子正确后进行）
public String toString(){
String str= root.toString();
str=str.substring(1,str.length()-1);
return str;
}
//计算二叉树的深度
public int Deepth(){
int n=this.num;
int deep=2;
while(n/2>0){
deep++;
n/=2;
}
return deep;
}
//创建树
public void CreateTree(int Max){
Tree lchild, rchild, lnode, rnode;
if(num == 1){
lchild = new Tree(String.valueOf(tools.getNumber(Max)), null, null);
rchild = new Tree(String.valueOf(tools.getNumber(Max)), null, null);
root = new Tree(String.valueOf(tools.getOperator()), lchild, rchild);
}
else{
int num1 = 0;
int n = Deepth() - 3;
boolean[] place = tools.getChildPlace(num);
root = new Tree(String.valueOf(tools.getOperator()), null, null);
arr.add(root);
for(int i = 0; i < n; i++){
for(int j = 0; j < (int)Math.pow(2, i); j++, num1++){
lchild = new Tree(String.valueOf(tools.getOperator()), null, null);
rchild = new Tree(String.valueOf(tools.getOperator()), null, null);
arr.get(j + num1).setChild(lchild, rchild);
arr.add(lchild);
arr.add(rchild);
}
}
for(int i = 0; i < place.length; i++){
if(place[i]){
lnode = new Tree(String.valueOf(tools.getNumber(10)), null, null);
rnode = new Tree(String.valueOf(tools.getNumber(10)), null, null);
if(i%2 == 0){
lchild = new Tree(String.valueOf(tools.getOperator()), lnode, rnode);
arr.add(lchild);
arr.get(num1).setLchild(lchild);
}
else{
rchild = new Tree(String.valueOf(tools.getOperator()), lnode, rnode);
arr.add(rchild);
arr.get(num1).setRchild(rchild);
}
}
else{
if(i%2 == 0){
lchild = new Tree(String.valueOf(tools.getNumber(10)), null, null);
arr.get(num1).setLchild(lchild);
}
else{
rchild = new Tree(String.valueOf(tools.getNumber(10)), null, null);
arr.get(num1).setRchild(rchild);
}
}
num1 = num1 + i%2;
}
}
}
}
String[] result=new String[10];
String[] answer=new String[10];
%>
<head>
<title>四则运算</title>
</head>
<body>
<div id="container">
<form action="putin.jsp" method="post" onSubmit="return check(this)">
<table bgcolor="yellow" border="5" cellpadding="10" cellspacing="10" style="margin: 10px auto; color: darkorange; border-collapse: collapse" align="center" width="500" >
<tr>
<th colspan=2>四则运算题目</th>
</tr>
<td align="center" style="color: orangered">题目 </td>
<td align="center" style="color: orangered">答案</td>
<script type="text/javascript">
var sysSecond = parseInt('121');
var interValObj = window.setInterval(setRemainTime, 1000);
function setRemainTime()
{
if (sysSecond > 0)
{
sysSecond -= 1;
var second = Math.floor(sysSecond % 60); // 计算秒
var minite = Math.floor((sysSecond / 60) % 60); //计算分
var timeHtml = "<li><span>"+minite+"</span>分</li>";
timeHtml+="<li><span>"+second+"</span>秒</li>";
try
{
document.getElementById("counter").innerHTML = timeHtml;
}
catch(e){}}
else
{
window.clearInterval(interValObj);}
}</script>
<div text-align="center" id="counter" style="margin-left: auto;margin-right: auto; width:120px; height:50px; background-color: cyan;">倒计时开始</div>
<%
for(int i=0;i<10;i++){
int k= ra.nextInt(2);
doTree t=new doTree(k+1);
t.CreateTree(100);
answer[i]=t.TestProblem();
result[i]=t.toString()+"=";
pageContext.setAttribute("q",result[i]);
pageContext.setAttribute("p",answer[i]);
%>
<tr>
<td align="center" style="color: orangered"><input type="hidden" name="timu" value="${q}"/>${q} </td>
<td><input type="text" style="background-color: cornsilk" name="key"/></td>
<input type="hidden" name="answer" value="${p}"/>
</tr>
<%
}
%>
<%--
<tr>
<th colspan=2><img src="yanzherngm.jsp"></th>
</tr>
--%>
<tr align="center">
<td colspan="5">
<input type="submit" style="background-color: aqua" value="保存" />
<input type="button" onclick="window.location.reload();" style="background-color: aqua" value="重置" />
</td>
</tr>
</table>
</form>
</div>
</body>
</html>
<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.Statement" %>
<%@ page import="java.sql.PreparedStatement" %>
<%@ page import="java.sql.*" %>
<%@ page import="java.util.Objects" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String timu[]=request.getParameterValues("timu");
String key[]= request.getParameterValues("key");
String answer[]= request.getParameterValues("answer");
for (int i = 0; i < timu.length; i++) {
System.out.println(timu[i]);
} for (int i = 0; i < timu.length; i++) {
System.out.println(key[i]);
} for (int i = 0; i < timu.length; i++) {
System.out.println(answer[i]);
}
try {
//1.注册驱动
Class.forName("com.mysql.cj.jdbc.Driver");
// 2.使用我自己的数据库 test 获取链接
String url = "jdbc:mysql://localhost:3306/test";
String username = "root";
String password = "123456";
Connection connection = DriverManager.getConnection(url, username, password);
//获取执行sql的对象statement
Statement statement = connection.createStatement();
// SQL语句，使用我自己的test数据库下的 boss 表
for(int i=0;i<10;i++)
{
String sql = "insert into test.user(题目,提交答案,正确答案) value (?,?,?)";
PreparedStatement pstmt;
pstmt = connection.prepareStatement(sql);
pstmt.setString(1, timu[i]);
pstmt.setString(2, key[i]);
pstmt.setString(3, answer[i]);
pstmt.executeUpdate();
if(!Objects.equals(key[i],answer[i])) {
String sql2 = "insert into test.project(错题题目,答案) value (?,?)";
PreparedStatement pstmt2;
pstmt2 = connection.prepareStatement(sql2);
pstmt2.setString(1, timu[i]);
pstmt2.setString(2, answer[i]);
pstmt2.executeUpdate();
}
}
connection.close();
} catch (Exception e) {
System.out.println(e);
}
//ResultSet resultSet = statement.executeQuery(sql);
//resultSet.close();
//statement.executeUpdate("delete from user where name='n'");
%>
<html>
<body>
<form action="index.jsp" method="post" onSubmit="return check(this)">
<table bgcolor="yellow" border="5" cellpadding="10" cellspacing="10" style="margin: 10px auto; color: darkorange; border-collapse: collapse" align="center" width="500" >
<tr>
<th colspan=2>错误题目</th>
</tr>
<td align="center" style="color: orangered">题目 </td>
<td align="center" style="color: orangered">提交的答案</td>
<%
for(int i=0;i<10;i++){
if(!key[i].equals(answer[i])){
pageContext.setAttribute("q",timu[i]);
pageContext.setAttribute("p",key[i]);
%>
<tr>
<td align="center" style="color: orangered"><input type="hidden" name="timu" value="${q}"/>${q} </td>
<td><input type="text" style="background-color: cornsilk" name="key" value="${p}"/></td>
</tr>
<%
}
}
%>
<%--
<tr>
<th colspan=2><img src="yanzherngm.jsp"></th>
</tr>
--%>
<tr align="center">
<td colspan="5">
<input type="submit" onclick="window.location.reload();" style="background-color: aqua" value="继续做题" />
</td>
</tr>
</table>
</form>
</body>
</html>
两个数据库表：
标签：String,int,18,2023.10,Tree,new,rchild,public From： https://www.cnblogs.com/jiajiayu/p/17773530.html