【Basic】File Download and Storage: Saving Webpage Source Code and File Resources
发布时间: 2024-09-15 11:59:06 阅读量: 25 订阅数: 32
# Chapter 1: Fundamentals of File Downloading and Storage
File downloading and storage are basic concepts in computer science, widely used in various applications. This chapter will introduce the fundamentals of file downloading and storage, including file system structure, file operation commands, file permission and attribute management, etc.
## File System Structure
The file system is a way for the operating system to manage files and directories. It divides storage devices (such as hard drives) into a hierarchical structure, where files and directories are organized into a tree-like structure. The root directory is at the top of the tree, and other directories and files are its child nodes.
## File Operation Commands
The file system provides various commands to operate on files and directories, including:
* `ls`: List files and directories in the current directory
* `cd`: Change the current directory
* `mkdir`: Create a new directory
* `touch`: Create a new file
* `cp`: Copy files or directories
* `mv`: Move or rename files or directories
* `rm`: Delete files or directories
# Chapter 2: Web Page Source Download and Parsing
### 2.1 Structure and Acquisition Methods of Web Page Source
#### 2.1.1 Introduction to HTML and HTTP Protocol
Web page source is the foundation of web pages, written in Hypertext Markup Language (HTML). HTML is a markup language used to define the structure and content of web pages. HTTP (Hypertext Transfer Protocol) is the protocol used for transferring web page sources between web browsers and web servers.
#### 2.1.2 Downloading Web Page Source Using Command-Line Tools
Command-line tools such as wget or curl can be used to download web page sources. These tools provide convenient methods for retrieving files from remote servers. For example, ***:
```***
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```
### 2.2 Parsing and Extracting Web Page Source
#### 2.2.1 Basics of Regular Expressions
Regular expressions are a powerful pattern-matching language that can be used to extract specific patterns from text. They are widely used for web page source parsing as they can quickly and effectively find and extract the desired information. The following is a regular expression used to extract titles from HTML:
```
<title>(.*?)</title>
```
#### 2.2.2 Application of HTML Parsing Libraries
HTML parsing libraries are software libraries designed for parsing HTML documents. They provide predefined functions and methods that make it easy to extract and manipulate HTML elements. For example, the following Python code uses BeautifulSoup to parse HTML and extract the title:
```python
from bs4 import BeautifulSoup
html = """<html><head><title>Example
# Chapter 3: File Resource Downloading and Management
### 3.1 Types of File Resources and Download Methods
**3.1.1 Common File Types Such as Images, Videos, Audio, etc.**
There are many types of file resources, common examples include:
| File Type | Extension |
|---|---|
| Images | .jpg, .png, .gif |
| Videos | .mp4, .avi, .mkv |
| Audio | .mp3, .wav, .ogg |
| Documents | .pdf, .doc, .xls |
| Compressed Files | .zip, .rar, .tar |
**3.1.2 Downloading File Resources Using Tools Like wget and curl**
`wget` and `curl` are commonly used command-line tools for
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