1.什么是rss？

RSS 的全称是「简易内容聚合」（Really Simple Syndication），是一个能让你在一个地方订阅各种感兴趣网站的工具。

一个网站支持 RSS，就意味着每当它新发布一篇新文章，就会往一个位于特定网址的文件中，以特定的语法（具体而言是 XML 标记语言或 JSON）增加一条记录，列明这篇文章的标题、作者、发表时间和内容（可以是全文，也可以是摘要）等信息。这样，用户只要搜集所有他感兴趣的网站提供的这种文件的网址，并不时检查这些文件内容的更新，就能知道这些网站是否、何时发布了什么内容。RSS 阅读器的核心功能，就是存储用户订阅的 RSS 地址，以固定的频率自动检查更新，并将其内容转换为易读的格式呈现给用户。

为什么用 RSS

RSS 的对立面是算法推荐，像微信公众号、知乎、微博、今日头条等平台。且不说算法推送平台广告多，迁移麻烦的问题。算法推荐的特点是，你不需要刻意选择，算法会根据你的喜好，给你推送内容。这样一来，你几乎没有选择的余地，在不断被「喂饱」中逐渐失去判断的能力。更可怕的地方在于，它替你定义了你的画像，然后把你潜移默化中变成了它所认为的你。「大数据杀熟」的东窗事发绝非偶然，用算法窥视用户隐私是当今互联网公司的通配。

做信息的主人，而不是奴隶。RSS 是一种公开的协议，可自由更换平台与客户端。重要的一点是，获取信息的权力完全自治。RSS 相比算法推荐，拥有了可控性和安全感，隐私完全掌握在自己手里。

什么是atom？

Atom是一对彼此相关的标准。Atom供稿格式（Atom Syndication Format）是用于网站消息来源，基于XML的文档格式；而Atom出版协定（Atom Publishing Protocol，简称AtomPub或APP）是用于新增及修改网络资源，基于HTTP的协议。

它借鉴了各种版本RSS的使用经验，被许多的聚合工具广泛使用在发布和使用上。Atom供稿格式设计作为RSS的替代品；而Atom出版协定用来取代现有的多种发布方式（如Blogger API和LiveJournal XML-RPC Client/Server Protocol）。而值得一提的是Google提供的多种服务正在使用Atom。Google Data API（GData）亦基于Atom。

Atom是IETF的"建议标准"，Atom供稿格式列为RFC 4287，而Atom出版协定列为RFC 5023。

2.代码工程

实验目标：实现rss和atom订阅源

pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>springboot-demo</artifactId>        <groupId>com.et</groupId>        <version>1.0-SNAPSHOT</version>    </parent>    <modelVersion>4.0.0</modelVersion>
    <artifactId>rss</artifactId>
    <properties>        <maven.compiler.source>8</maven.compiler.source>        <maven.compiler.target>8</maven.compiler.target>    </properties>    <dependencies>
        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>
        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-autoconfigure</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <!--ROAM依赖  RSS 订阅-->        <dependency>            <groupId>com.rometools</groupId>            <artifactId>rome</artifactId>            <version>1.15.0</version>        </dependency>
        <!-- https://mvnrepository.com/artifact/com.rometools/rome-utils -->        <dependency>            <groupId>com.rometools</groupId>            <artifactId>rome-utils</artifactId>            <version>1.15.0</version>        </dependency>
        <dependency>            <groupId>org.jdom</groupId>            <artifactId>jdom2</artifactId>            <version>2.0.6</version>        </dependency>

    </dependencies></project>

controller

采用rome库实现rss和atom订阅

package com.et.rss.controller;

import com.rometools.rome.feed.atom.*;import com.rometools.rome.feed.rss.Channel;import com.rometools.rome.feed.rss.Description;import com.rometools.rome.feed.rss.Image;import com.rometools.rome.feed.rss.Item;import com.rometools.rome.feed.synd.SyndPerson;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.Collections;import java.util.Date;

@RestController@RequestMapping("/feed")public class FeedController {

    @GetMapping(path = "/rss")    public Channel rss() {        Channel channel = new Channel();        channel.setFeedType("rss_2.0");        channel.setTitle("HBLOG Feed");        channel.setDescription("Recent posts");        channel.setLink("http://www.liuhaihua.cn");        channel.setUri("http://www.liuhaihua.cn");        channel.setGenerator("Harries");
        Image image = new Image();        image.setUrl("http://www.liuhaihua.cn/img/hblog.png");        image.setTitle("HBLOG Feed");        image.setHeight(32);        image.setWidth(32);        channel.setImage(image);
        Date postDate = new Date();        channel.setPubDate(postDate);
        Item item = new Item();        item.setAuthor("Harries");        item.setLink("http://www.liuhaihua.cn/archives/710608.html");        item.setTitle("Spring Boot integrated banner   quick start demo");        item.setUri("http://www.liuhaihua.cn/archives/710608.html");        item.setComments("http://www.liuhaihua.cn/archives/710608.html#commnet");
        com.rometools.rome.feed.rss.Category category = new com.rometools.rome.feed.rss.Category();        category.setValue("CORS");        item.setCategories(Collections.singletonList(category));
        Description descr = new Description();        descr.setValue("pring Boot Banner is a feature for displaying custom ASCII art and information at application startup. This ASCII art usually includes the project name, version number, author information");        item.setDescription(descr);        item.setPubDate(postDate);
        channel.setItems(Collections.singletonList(item));        //Like more Entries here about different new topics        return channel;    }
    @GetMapping(path = "/atom")    public Feed atom() {        Feed feed = new Feed();        feed.setFeedType("atom_1.0");        feed.setTitle("HBLOG");        feed.setId("http://www.liuhaihua.cn");
        Content subtitle = new Content();        subtitle.setType("text/plain");        subtitle.setValue("recents post");        feed.setSubtitle(subtitle);
        Date postDate = new Date();        feed.setUpdated(postDate);
        Entry entry = new Entry();
        Link link = new Link();        link.setHref("http://www.liuhaihua.cn/archives/710608.html");        entry.setAlternateLinks(Collections.singletonList(link));        SyndPerson author = new Person();        author.setName("HBLOG");        entry.setAuthors(Collections.singletonList(author));        entry.setCreated(postDate);        entry.setPublished(postDate);        entry.setUpdated(postDate);        entry.setId("710608");        entry.setTitle("Spring Boot integrated banner   quick start demo");
        Category category = new Category();        category.setTerm("CORS");        entry.setCategories(Collections.singletonList(category));
        Content summary = new Content();        summary.setType("text/plain");        summary.setValue("Spring Boot Banner is a feature for displaying custom ASCII art and information at application startup. This ASCII art usually includes the project name, version number, author information");        entry.setSummary(summary);
        feed.setEntries(Collections.singletonList(entry));        //add different topic        return feed;    }
}

DemoApplication.java

package com.et.rss;
import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplicationpublic class DemoApplication {
   public static void main(String[] args) {      SpringApplication.run(DemoApplication.class, args);   }}

application.yaml

server:  port: 8088

以上只是一些关键代码，所有代码请参见下面代码仓库

代码仓库

https://github.com/Harries/springboot-demo

3.测试

启动Spring Boot应用

rss

http://127.0.0.1:8088/feed/rss

<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">  <channel>    <title>HBLOG Feed</title>    <link>http://www.liuhaihua.cn</link>    <description>Recent posts</description>    <pubDate>Fri, 24 May 2024 14:26:21 GMT</pubDate>    <generator>Harries</generator>    <image>      <title>HBLOG Feed</title>      <url>http://www.liuhaihua.cn/img/hblog.png</url>      <width>32</width>      <height>32</height>    </image>    <item>      <title>Spring Boot integrated banner   quick start demo</title>      <link>http://www.liuhaihua.cn/archives/710608.html</link>      <description>pring Boot Banner is a feature for displaying custom ASCII art and information at application startup. This ASCII art usually includes the project name, version number, author information</description>      <category>CORS</category>      <pubDate>Fri, 24 May 2024 14:26:21 GMT</pubDate>      <author>Harries</author>      <comments>http://www.liuhaihua.cn/archives/710608.html#commnet</comments>    </item>  </channel></rss>

atom

http://127.0.0.1:8088/feed/atom

<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">  <title>HBLOG</title>  <subtitle type="text">recents post</subtitle>  <id>http://www.liuhaihua.cn</id>  <updated>2024-05-24T14:25:38Z</updated>  <entry>    <title>Spring Boot integrated banner   quick start demo</title>    <link rel="alternate" href="http://www.liuhaihua.cn/archives/710608.html" />    <category term="CORS" />    <author>      <name>HBLOG</name>    </author>    <id>710608</id>    <updated>2024-05-24T14:25:38Z</updated>    <published>2024-05-24T14:25:38Z</published>    <summary type="text">Spring Boot Banner is a feature for displaying custom ASCII art and information at application startup. This ASCII art usually includes the project name, version number, author information</summary>  </entry></feed>

4.引用

https://howtodoinjava.com/spring-boot/spring-boot-rome-rss-and-atom-feed/
http://www.liuhaihua.cn/archives/710623.html

ITPub博客

Spring Boot集成rss快速入门demo