Django实现在线考试系统的代码

好的，下面是一个简单的Django在线考试系统的代码示例，供您参考：

### models.py

from django.db import models
from django.contrib.auth.models import User

class Question(models.Model):
    title = models.CharField(max_length=256)
    content = models.TextField()
    options = models.TextField()
    answer = models.CharField(max_length=256)
    analysis = models.TextField()
    difficulty = models.CharField(max_length=32)

class Paper(models.Model):
    name = models.CharField(max_length=256)
    description = models.TextField()
    questions = models.TextField()

class Score(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    paper = models.ForeignKey(Paper, on_delete=models.CASCADE)
    score = models.IntegerField()
    start_time = models.DateTimeField(auto_now_add=True)
    end_time = models.DateTimeField(auto_now=True)

### forms.py

from django import forms
from .models import Score

class ExamForm(forms.ModelForm):
    class Meta:
        model = Score
        fields = []

    def __init__(self, *args, **kwargs):
        self.paper = kwargs.pop('paper', None)
        super().__init__(*args, **kwargs)
        questions = self.paper.questions.split(',')
        for question in questions:
            self.fields[f'question_{question}'] = forms.CharField(widget=forms.RadioSelect(choices=[(i, x) for i, x in enumerate(self.get_options(question))]))
            self.fields[f'question_{question}'].label = self.get_title(question)

    def get_title(self, question_id):
        question = Question.objects.get(id=question_id)
        return question.title

    def get_options(self, question_id):
        question = Question.objects.get(id=question_id)
        return question.options.split(',')

class PaperForm(forms.ModelForm):
    class Meta:
        model = Paper
        fields = ['name', 'description', 'questions']

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['questions'].widget.attrs.update({'class': 'form-control'})

class QuestionForm(forms.ModelForm):
    class Meta:
        model = Question
        fields = ['title', 'content', 'options', 'answer', 'analysis', 'difficulty']

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['options'].widget.attrs.update({'class': 'form-control'})
        self.fields['options'].widget.attrs.update({'rows': '3'})
        self.fields['analysis'].widget.attrs.update({'class': 'form-control'})
        self.fields['analysis'].widget.attrs.update({'rows': '3'})

### views.py

from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from django.contrib import messages
from django.http import HttpResponseForbidden
from django.db.models import Avg, Count
from .models import Question, Paper, Score
from .forms import ExamForm, PaperForm, QuestionForm

def home(request):
    papers = Paper.objects.all().annotate(num_questions=Count('questions'))
    return render(request, 'exam/home.html', {'papers': papers})

@login_required
def exam(request, paper_id):
    paper = Paper.objects.get(id=paper_id)
    form = ExamForm(paper=paper)
    if request.method == 'POST':
        form = ExamForm(request.POST, paper=paper)
        if form.is_valid():
            score = 0
            questions = paper.questions.split(',')
            for question in questions:
                answer = Question.objects.get(id=question).answer
                if form.cleaned_data[f'question_{question}'] == answer:
                    score += 1
            score = Score(user=request.user, paper=paper, score=score)
            score.save()
            return redirect('exam:score', score.id)
    return render(request, 'exam/exam.html', {'paper': paper, 'form': form})

@login_required
def score(request, score_id):
    score = Score.objects.get(id=score_id)
    if score.user != request.user:
        return HttpResponseForbidden()
    return render(request, 'exam/score.html', {'score': score})

@login_required
def paper_create(request):
    if request.method == 'POST':
        form = PaperForm(request.POST)
        if form.is_valid():
            paper = form.save()
            messages.success(request, '试卷创建成功！')
            return redirect('exam:paper_edit', paper.id)
    else:
        form = PaperForm()
    return render(request, 'exam/paper_form.html', {'form': form})

@login_required
def paper_edit(request, paper_id):
    paper = Paper.objects.get(id=paper_id)
    if request.method == 'POST':
        form = PaperForm(request.POST, instance=paper)
        if form.is_valid():
            form.save()
            messages.success(request, '试卷修改成功！')
            return redirect('exam:paper_edit', paper.id)
    else:
        form = PaperForm(instance=paper)
    return render(request, 'exam/paper_form.html', {'form': form, 'paper': paper})

@login_required
def question_create(request):
    if not request.user.is_superuser:
        return HttpResponseForbidden()
    if request.method == 'POST':
        form = QuestionForm(request.POST)
        if form.is_valid():
            form.save()
            messages.success(request, '题目创建成功！')
            return redirect('exam:question_create')
    else:
        form = QuestionForm()
    return render(request, 'exam/question_form.html', {'form': form})

### urls.py

from django.urls import path
from . import views

app_name = 'exam'
urlpatterns = [
    path('', views.home, name='home'),
    path('exam/<int:paper_id>/', views.exam, name='exam'),
    path('score/<int:score_id>/', views.score, name='score'),
    path('paper/create/', views.paper_create, name='paper_create'),
    path('paper/edit/<int:paper_id>/', views.paper_edit, name='paper_edit'),
    path('question/create/', views.question_create, name='question_create'),
]

以上是在线考试系统的简单实现，您可以根据自己的需求进行修改和完善。如果您有任何问题或需要进一步的帮助，请随时联系我。