习题

今天好homie甩我个NodeJS的练习题，来看看怎么个事
题目

分析一下，该怎么实现呢？

我灵光乍现，NodeJS + Express刚刚好能够实现
Express快速搭建一个接口，NodeJS内置的fs可以处理同步和异步的读写、path可以读取路径
然后自定义 Express 中间件，最后用 JSON 文件存储书籍数据
怎么整呢？俺寻思也妹发个压缩包啊……
只能新建文件了
先写一个PY脚本，来生成10个书籍文件吧
里面的内容统一为This is Book NO.{i}
文件名就叫book_{i}.txt
____根目录
|————书籍
|——book{i}.txt
|————main.js
|____book.json

在 书籍 的根目录中新建一个py脚本

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import os

def create_book():
    base_dir = os.path.dirname(os.path.abspath(__file__))
    
    for i in range(1, 11):
        file_name = f"book_{i:03d}.txt"
        file_path = os.path.join(base_dir, file_name)
        
        try:
            with open(file_path, 'w', encoding='utf-8') as f:
                f.write(f"This is book No.{i}\n")
            
            print(f"创建文件: {file_path}")
        
        except Exception as e:
            print(f"创建文件 {file_path} 失败: {str(e)}")

if __name__ == "__main__":
    create_book()

运行一下，这样就在 书籍 目录下创建了以下文件

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book_001.txt
book_002.txt
book_003.txt
book_004.txt
book_005.txt
book_006.txt
book_007.txt
book_008.txt
book_009.txt
book_010.txt

接下来写初始的book.json，包含上述的文件属性

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import json
import os

def generate_book_json():

    book_list = []
    book_dir = "./书籍"
    
    if not os.path.exists(book_dir):
        os.makedirs(book_dir)
        print(f"创建目录: {book_dir}")
    
    for i in range(1, 11):
        num = f"{i:03d}"
        book_info = {
            "book": f"book{num}",
            "author": num,
            "summary": f"简介{num}",
            "subDate": "2025-11-29"
        }
        
        book_file_path = os.path.join(book_dir, f"book{num}.txt")
        if os.path.exists(book_file_path):
            try:
                with open(book_file_path, 'r', encoding='utf-8') as f:
                    file_content = f.read().strip()
                    book_info["file_content"] = file_content
                    book_info["summary"] = f"简介{num} - {file_content[:20]}..."
            except Exception as e:
                print(f"读取文件 {book_file_path} 失败: {e}")
        
        book_list.append(book_info)
    

    output_path = "./book.json"
    try:
        with open(output_path, 'w', encoding='utf-8') as f:
            json.dump(book_list, f, ensure_ascii=False, indent=4)
        print(f"生成JSON文件: {output_path}")
        print(f"生成 {len(book_list)} 条书籍信息")
    except Exception as e:
        print(f"写入JSON文件失败: {e}")

if __name__ == "__main__":
    generate_book_json()

在book.json写入了以下文件

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[
    {
        "book": "book001",
        "author": "001",
        "summary": "简介001",
        "subDate": "2025-11-29"
    },
    {
        "book": "book002",
        "author": "002",
        "summary": "简介002",
        "subDate": "2025-11-29"
    },
    {
        "book": "book003",
        "author": "003",
        "summary": "简介003",
        "subDate": "2025-11-29"
    },
    {
        "book": "book004",
        "author": "004",
        "summary": "简介004",
        "subDate": "2025-11-29"
    },
    {
        "book": "book005",
        "author": "005",
        "summary": "简介005",
        "subDate": "2025-11-29"
    },
    {
        "book": "book006",
        "author": "006",
        "summary": "简介006",
        "subDate": "2025-11-29"
    },
    {
        "book": "book007",
        "author": "007",
        "summary": "简介007",
        "subDate": "2025-11-29"
    },
    {
        "book": "book008",
        "author": "008",
        "summary": "简介008",
        "subDate": "2025-11-29"
    },
    {
        "book": "book009",
        "author": "009",
        "summary": "简介009",
        "subDate": "2025-11-29"
    },
    {
        "book": "book010",
        "author": "010",
        "summary": "简介010",
        "subDate": "2025-11-29"
    }
]

到这里算是把木有的东西补齐了

接下来开始捯饬一下

之前提到过可以使用express的方法实现