st2411020204
3127a8a647
实现一个基于Streamlit的学习笔记管理应用，包含以下功能： - 添加、编辑、删除笔记 - 笔记分类管理 - 搜索和筛选功能 - 数据导入导出功能 - 统计信息展示
456 lines
18 KiB
Python
456 lines
18 KiB
Python
import streamlit as st
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from datetime import datetime
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import json
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import os
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# 1. 页面配置
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st.set_page_config(page_title="学习笔记整理器", page_icon="📚", layout="wide")
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st.title("📚 学习笔记整理器")
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# 2. 数据持久化函数
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def save_notes():
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"""保存笔记到 JSON 文件"""
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data = {
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"notes": st.session_state.notes,
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"categories": st.session_state.categories
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}
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with open('notes_data.json', 'w', encoding='utf-8') as f:
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json.dump(data, f, ensure_ascii=False, indent=2)
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def load_notes():
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"""从 JSON 文件加载笔记"""
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if os.path.exists('notes_data.json'):
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with open('notes_data.json', 'r', encoding='utf-8') as f:
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data = json.load(f)
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st.session_state.notes = data.get("notes", [])
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st.session_state.categories = data.get("categories", ["编程", "数学", "英语", "其他"])
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# 3. 初始化数据
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if "notes" not in st.session_state:
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st.session_state.notes = []
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load_notes()
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if "categories" not in st.session_state:
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st.session_state.categories = ["编程", "数学", "英语", "其他"]
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load_notes()
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# 初始化编辑状态
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if "editing_note" not in st.session_state:
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st.session_state.editing_note = None
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# 4. 左侧侧边栏 - 添加笔记和管理类型
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with st.sidebar:
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st.header("📝 添加笔记")
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# 笔记标题
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title = st.text_input("标题", placeholder="输入笔记标题")
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# 分类选择（支持自定义）
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category = st.selectbox(
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"选择分类",
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st.session_state.categories,
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help="选择笔记的分类"
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)
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# 自定义分类输入
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new_category = st.text_input(
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"或创建新分类",
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placeholder="输入新分类名称，按回车添加",
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key="new_category_input"
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)
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# 添加新分类按钮
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if st.button("➕ 添加新分类"):
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if new_category and new_category not in st.session_state.categories:
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st.session_state.categories.append(new_category)
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save_notes()
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st.success(f"已添加新分类：{new_category}")
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st.rerun()
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elif new_category in st.session_state.categories:
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st.warning("该分类已存在")
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# 笔记内容
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content = st.text_area(
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"笔记内容",
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placeholder="输入笔记内容...",
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height=200
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)
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# 添加按钮
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if st.button("添加笔记", type="primary"):
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if title and content:
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note = {
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"id": len(st.session_state.notes) + 1,
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"title": title,
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"category": category,
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"content": content,
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"created_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
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"updated_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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}
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st.session_state.notes.append(note)
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save_notes()
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st.success("笔记添加成功！")
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else:
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st.warning("请填写标题和内容")
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st.divider()
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# 显示所有分类
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st.subheader("📂 所有分类")
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for cat in st.session_state.categories:
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st.markdown(f"- {cat}")
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# 5. 主界面 - 笔记展示和搜索
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st.header("📖 我的笔记")
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# 搜索和排序区域
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col1, col2, col3, col4 = st.columns([2, 1, 1, 1])
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with col1:
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# 搜索关键词
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search_query = st.text_input(
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"🔍 搜索关键词",
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placeholder="输入关键词...",
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help="支持模糊搜索"
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)
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with col2:
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# 搜索范围选择
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search_scope = st.selectbox(
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"搜索范围",
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["全部", "仅标题", "仅内容", "仅类型"],
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help="选择搜索的范围"
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)
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with col3:
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# 分类筛选
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filter_category = st.selectbox(
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"筛选分类",
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["全部"] + st.session_state.categories,
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help="按分类筛选笔记"
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)
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with col4:
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# 排序方式
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sort_by = st.selectbox(
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"排序方式",
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["最新", "最旧", "标题A-Z", "标题Z-A", "类型A-Z", "类型Z-A"],
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help="选择笔记的排序方式"
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)
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# 6. 显示笔记
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if st.session_state.notes:
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# 筛选和搜索逻辑
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filtered_notes = []
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for note in st.session_state.notes:
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# 分类筛选
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category_match = filter_category == "全部" or note["category"] == filter_category
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# 关键词搜索（根据选择范围）
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search_match = True
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if search_query:
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query = search_query.lower()
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if search_scope == "全部":
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search_match = (
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query in note["title"].lower() or
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query in note["content"].lower() or
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query in note["category"].lower()
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)
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elif search_scope == "仅标题":
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search_match = query in note["title"].lower()
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elif search_scope == "仅内容":
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search_match = query in note["content"].lower()
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elif search_scope == "仅类型":
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search_match = query in note["category"].lower()
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if category_match and search_match:
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filtered_notes.append(note)
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# 排序逻辑
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if sort_by == "最新":
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filtered_notes.sort(key=lambda x: x["created_at"], reverse=True)
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elif sort_by == "最旧":
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filtered_notes.sort(key=lambda x: x["created_at"])
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elif sort_by == "标题A-Z":
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filtered_notes.sort(key=lambda x: x["title"].lower())
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elif sort_by == "标题Z-A":
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filtered_notes.sort(key=lambda x: x["title"].lower(), reverse=True)
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elif sort_by == "类型A-Z":
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filtered_notes.sort(key=lambda x: x["category"].lower())
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elif sort_by == "类型Z-A":
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filtered_notes.sort(key=lambda x: x["category"].lower(), reverse=True)
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# 显示筛选结果
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if filtered_notes:
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st.info(f"找到 {len(filtered_notes)} 条笔记")
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# 使用两列布局展示笔记
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cols = st.columns(2)
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for i, note in enumerate(filtered_notes):
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with cols[i % 2]:
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# 检查是否正在编辑此笔记
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if st.session_state.editing_note == note['id']:
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with st.expander(f"✏️ 编辑: {note['title']}", expanded=True):
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# 编辑表单
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edit_title = st.text_input("标题", value=note['title'], key=f"edit_title_{note['id']}")
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edit_category = st.selectbox(
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"分类",
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st.session_state.categories,
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index=st.session_state.categories.index(note['category']) if note['category'] in st.session_state.categories else 0,
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key=f"edit_category_{note['id']}"
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)
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edit_content = st.text_area("内容", value=note['content'], height=200, key=f"edit_content_{note['id']}")
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# 保存和取消按钮
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col_save, col_cancel = st.columns(2)
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with col_save:
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if st.button("💾 保存修改", key=f"save_{note['id']}", type="primary"):
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note['title'] = edit_title
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note['category'] = edit_category
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note['content'] = edit_content
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note['updated_at'] = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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st.session_state.editing_note = None
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save_notes()
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st.success("笔记已更新！")
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st.rerun()
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with col_cancel:
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if st.button("❌ 取消", key=f"cancel_{note['id']}"):
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st.session_state.editing_note = None
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st.rerun()
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else:
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# 正常显示笔记
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with st.expander(f"📌 {note['title']}", expanded=False):
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# 显示笔记元信息
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st.markdown(f"**分类：** {note['category']}")
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st.markdown(f"**创建时间：** {note['created_at']}")
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if 'updated_at' in note:
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st.markdown(f"**更新时间：** {note['updated_at']}")
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st.markdown("---")
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# 显示笔记内容
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st.markdown(note['content'])
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# 操作按钮
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col_edit, col_delete = st.columns(2)
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with col_edit:
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if st.button("✏️ 编辑", key=f"edit_{note['id']}"):
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st.session_state.editing_note = note['id']
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st.rerun()
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with col_delete:
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if st.button("🗑️ 删除", key=f"delete_{note['id']}"):
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st.session_state.notes.remove(note)
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st.session_state.editing_note = None
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save_notes()
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st.rerun()
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else:
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st.warning("没有找到匹配的笔记")
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else:
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st.info("还没有笔记，请在左侧添加您的第一条笔记！")
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# 7. 统计信息
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st.divider()
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st.subheader("📊 统计信息")
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# 动态生成统计列
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stat_cols = st.columns(min(5, len(st.session_state.categories) + 1))
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with stat_cols[0]:
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st.metric("总笔记数", len(st.session_state.notes))
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for i, cat in enumerate(st.session_state.categories):
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if i + 1 < len(stat_cols):
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with stat_cols[i + 1]:
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count = len([n for n in st.session_state.notes if n["category"] == cat])
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st.metric(cat, count)
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# 8. 数据管理
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st.divider()
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st.subheader("💾 数据管理")
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# 导入JSON文件
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st.markdown("### 📥 导入笔记")
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tab_json, tab_txt = st.tabs(["JSON文件", "文本文件"])
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with tab_json:
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uploaded_file = st.file_uploader("选择JSON文件", type=['json'], help="选择之前导出的JSON文件", key="json_uploader")
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if uploaded_file is not None:
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try:
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# 读取并解析JSON文件
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import_data = json.load(uploaded_file)
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# 显示导入预览
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st.info(f"文件包含 {len(import_data.get('notes', []))} 条笔记")
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# 显示笔记列表预览
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with st.expander("📋 查看文件内容", expanded=False):
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for i, note in enumerate(import_data.get('notes', [])[:5]):
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st.markdown(f"**{i+1}. {note.get('title', '无标题')}**")
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st.markdown(f" 分类: {note.get('category', '未知')}")
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st.markdown(f" 时间: {note.get('created_at', '未知')}")
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st.markdown("---")
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if len(import_data.get('notes', [])) > 5:
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st.info(f"还有 {len(import_data.get('notes', [])) - 5} 条笔记...")
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# 导入选项
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col_merge, col_replace = st.columns(2)
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with col_merge:
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if st.button("🔄 合并导入", type="primary", key="merge_json"):
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# 合并导入：保留现有笔记，添加新笔记
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new_notes = import_data.get('notes', [])
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for note in new_notes:
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note['id'] = len(st.session_state.notes) + 1
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st.session_state.notes.append(note)
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# 合并分类
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new_categories = import_data.get('categories', [])
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for cat in new_categories:
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if cat not in st.session_state.categories:
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st.session_state.categories.append(cat)
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save_notes()
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st.success(f"成功导入 {len(new_notes)} 条笔记！")
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st.rerun()
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with col_replace:
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if st.button("⚠️ 替换导入", key="replace_json"):
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# 替换导入：清空现有笔记，导入新笔记
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st.session_state.notes = import_data.get('notes', [])
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st.session_state.categories = import_data.get('categories', ["编程", "数学", "英语", "其他"])
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st.session_state.editing_note = None
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save_notes()
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st.success(f"成功替换为 {len(st.session_state.notes)} 条笔记！")
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st.rerun()
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except Exception as e:
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st.error(f"文件解析失败: {str(e)}")
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with tab_txt:
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# 导入文本文件
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txt_file = st.file_uploader("选择文本文件", type=['txt'], help="选择要导入的文本文件", key="txt_uploader")
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if txt_file is not None:
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try:
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# 读取文本文件内容
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content = txt_file.read().decode('utf-8')
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# 显示文件内容预览
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st.info(f"文件大小: {len(content)} 字符")
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with st.expander("📋 查看文件内容", expanded=False):
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st.text(content[:1000])
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if len(content) > 1000:
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st.info(f"还有 {len(content) - 1000} 个字符...")
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# 设置导入参数
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col_title, col_cat = st.columns(2)
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with col_title:
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import_title = st.text_input("笔记标题", value=txt_file.name.replace('.txt', ''), help="为导入的笔记设置标题")
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with col_cat:
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import_category = st.selectbox("笔记分类", st.session_state.categories)
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# 导入按钮
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if st.button("📥 导入文本文件", type="primary"):
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note = {
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"id": len(st.session_state.notes) + 1,
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"title": import_title,
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"category": import_category,
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"content": content,
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"created_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
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"updated_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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}
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st.session_state.notes.append(note)
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save_notes()
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st.success(f"成功导入笔记：{import_title}")
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st.rerun()
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except Exception as e:
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st.error(f"文件读取失败: {str(e)}")
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st.divider()
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# 导出功能
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st.markdown("### 📤 导出笔记")
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export_tab_json, export_tab_txt = st.tabs(["JSON格式", "文本格式"])
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with export_tab_json:
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if st.button("📤 导出为JSON", key="export_json"):
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st.download_button(
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label="下载 JSON 文件",
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data=json.dumps({"notes": st.session_state.notes, "categories": st.session_state.categories}, ensure_ascii=False, indent=2),
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file_name=f"notes_backup_{datetime.now().strftime('%Y%m%d_%H%M%S')}.json",
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mime="application/json"
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)
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with export_tab_txt:
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# 导出选项
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export_option = st.radio("导出选项", ["导出所有笔记", "导出单个笔记"])
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if export_option == "导出所有笔记":
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if st.button("📤 导出所有笔记为文本", type="primary", key="export_all_txt"):
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# 合并所有笔记为一个文本文件
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all_content = "=" * 50 + "\n"
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all_content += f"学习笔记备份 - {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n"
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all_content += "=" * 50 + "\n\n"
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for note in st.session_state.notes:
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all_content += "-" * 40 + "\n"
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all_content += f"标题: {note['title']}\n"
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all_content += f"分类: {note['category']}\n"
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all_content += f"创建时间: {note['created_at']}\n"
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all_content += "-" * 40 + "\n\n"
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all_content += note['content'] + "\n\n"
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st.download_button(
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label="下载文本文件",
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data=all_content,
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file_name=f"notes_all_{datetime.now().strftime('%Y%m%d_%H%M%S')}.txt",
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mime="text/plain"
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)
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else:
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# 导出单个笔记
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if st.session_state.notes:
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note_titles = [f"{note['id']}. {note['title']}" for note in st.session_state.notes]
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selected_note = st.selectbox("选择要导出的笔记", note_titles)
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if st.button("📤 导出选中笔记", type="primary", key="export_single_txt"):
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# 找到选中的笔记
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note_id = int(selected_note.split('.')[0])
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note = next((n for n in st.session_state.notes if n['id'] == note_id), None)
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if note:
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# 格式化笔记内容
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note_content = "=" * 50 + "\n"
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note_content += f"标题: {note['title']}\n"
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note_content += f"分类: {note['category']}\n"
|
||
note_content += f"创建时间: {note['created_at']}\n"
|
||
if 'updated_at' in note:
|
||
note_content += f"更新时间: {note['updated_at']}\n"
|
||
note_content += "=" * 50 + "\n\n"
|
||
note_content += note['content']
|
||
|
||
st.download_button(
|
||
label="下载文本文件",
|
||
data=note_content,
|
||
file_name=f"note_{note['id']}_{note['title']}.txt",
|
||
mime="text/plain"
|
||
)
|
||
else:
|
||
st.info("没有笔记可导出")
|
||
|
||
st.divider()
|
||
|
||
# 清空功能
|
||
col_clear = st.columns(1)[0]
|
||
with col_clear:
|
||
if st.button("🗑️ 清空所有笔记"):
|
||
if st.session_state.notes:
|
||
st.warning("⚠️ 此操作不可恢复！")
|
||
if st.button("确认清空"):
|
||
st.session_state.notes = []
|
||
st.session_state.editing_note = None
|
||
save_notes()
|
||
st.success("所有笔记已清空！")
|
||
st.rerun()
|
||
else:
|
||
st.info("没有笔记可清空")
|