RSS订阅技术解析与应用：从协议原理到现代实践

<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
  <channel>
    <title>技术周刊</title>
    <link>https://tech.example.com</link>
    <description>每周更新技术资讯</description>
    <item>
      <title>AI大模型最新进展</title>
      <link>https://tech.example.com/ai-2025</link>
      <pubDate>Wed, 13 Aug 2025 14:30:00 GMT</pubDate>
      <description>OpenAI发布多模态模型GPT-5...</description>
    </item>
  </channel>
</rss>

<feed xmlns="http://www.w3.org/2005/Atom">
  <title>Atom示例</title>
  <updated>2025-08-13T12:00:00Z</updated>
  <entry>
    <id>urn:uuid:1225c695-cfb8-4ebb-aaaa-80da344efa6a</id>
    <summary>Atom支持UUID和严格时间戳...</summary>
  </entry>
</feed>

<?php
header('Content-Type: application/rss+xml');
$rss = new SimpleXMLElement('<rss/>');
$rss->addAttribute('version', '2.0');

$channel = $rss->addChild('channel');
$channel->addChild('title', '动态新闻');
$channel->addChild('link', 'https://news.example.com');

$item = $channel->addChild('item');
$item->addChild('title', 'Python 3.13发布');
$item->addChild('description', '新增类型提示增强功能...');

echo $rss->asXML();
?>

import feedparser

feed = feedparser.parse('https://tech.example.com/rss')
for entry in feed.entries:
    print(f"标题: {entry.title}")
    print(f"链接: {entry.link}")
    print(f"发布时间: {entry.published}")

<item>
  <title>iPhone 16 Pro降价至¥7999</title>
  <link>https://shop.example.com/iphone16</link>
  <price>7999.00</price> <!-- 自定义字段 -->
</item>

graph LR
A[内容管理系统] --> B[生成部门级RSS]
B --> C[聚合为企业总RSS]
C --> D[员工客户端订阅]
D --> E[标记已读/收藏至知识库]

{
  "version": "https://jsonfeed.org/version/1",
  "title": "极客新闻",
  "items": [{
    "id": "12345",
    "content_text": "量子计算机突破..."
  }]
}