EE顛覆者第九章 Spring Integration

Spring Integration 系統集成

提供了基於 Spring EIP Enterprise Integration Patterns

企業集成模式

不同系統之前的交互

通過異步消息驅動來達到系統與系統交互時系統之間的鬆耦合。

Spring Integration Java DSL

實現分類讀取遠程的特定文件，實現發送郵件。

實戰

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-integration</artifactId>
		</dependency>
		
			<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-mail</artifactId>
		</dependency>
		
		<dependency>
			<groupId>org.springframework.integration</groupId>
			<artifactId>spring-integration-feed</artifactId>
		</dependency>
		
			<dependency>
			<groupId>org.springframework.integration</groupId>
			<artifactId>spring-integration-mail</artifactId>
		</dependency>
		
		<dependency>
			<groupId>org.springframework.integration</groupId>
			<artifactId>spring-integration-java-dsl</artifactId>
			<version>1.1.0.M1</version>
		</dependency>
		
	
		
		
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

讀取:https://spring.io/blog.atom ,新聞聚合文件

<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
  <title>Spring</title>
  <link rel="alternate" href="https://spring.io/blog" />
  <link rel="self" href="https://spring.io/blog.atom" />
  <id>http://spring.io/blog.atom</id>
  <icon>https://spring.io/favicon.ico</icon>
  <updated>2020-04-17T20:12:51Z</updated>
  <entry>
    <title>Spring Cloud App Broker 1.0.5 released</title>
    <link rel="alternate" href="https://spring.io/blog/2020/04/17/spring-cloud-app-broker-1-0-5-released" />
    <category term="releases" label="Releases" />
    <author>
      <name>Roy Clarkson</name>
    </author>
    <id>tag:spring.io,2020-04-17:4033</id>
    <updated>2020-04-17T20:12:51Z</updated>
    </entry>
</feed>

讀取到的消息通過分類 Category

將消息轉到不同的消息通道

將 releases 和 engineering寫入磁盤。

news發送郵件

@SpringBootApplication
public class Ch94Application {

	public static void main(String[] args) {
		SpringApplication.run(Ch94Application.class, args);
	}

	@Value("https://spring.io/blog.atom") // 1
	Resource resource;

	@Bean(name = PollerMetadata.DEFAULT_POLLER)
	public PollerMetadata poller() { // 2 默認輪詢方式讀取
		return Pollers.fixedRate(500).get();
	}

	@Bean
	public FeedEntryMessageSource feedMessageSource() throws IOException { //3
		FeedEntryMessageSource messageSource = new FeedEntryMessageSource(resource.getURL(), "news");
		return messageSource;
	}

	@Bean
	public IntegrationFlow myFlow() throws IOException {
		return IntegrationFlows.from(feedMessageSource()) //4
				.<SyndEntry, String> route(payload -> payload.getCategories().get(0).getName(),//5
						mapping -> mapping.channelMapping("releases", "releasesChannel") //6
								.channelMapping("engineering", "engineeringChannel")
								.channelMapping("news", "newsChannel"))

		.get(); // 7
	}

	@Bean
	public IntegrationFlow releasesFlow() {
		return IntegrationFlows.from(MessageChannels.queue("releasesChannel", 10)) //1
				.<SyndEntry, String> transform(
						payload -> "《" + payload.getTitle() + "》 " + payload.getLink() + getProperty("line.separator")) //2
				.handle(Files.outboundAdapter(new File("e:/springblog")) //3
						.fileExistsMode(FileExistsMode.APPEND) //4
						.charset("UTF-8") //5
						.fileNameGenerator(message -> "releases.txt") //6
						.get())
				.get();
	}

	@Bean
	public IntegrationFlow engineeringFlow() {
		return IntegrationFlows.from(MessageChannels.queue("engineeringChannel", 10))
				.<SyndEntry, String> transform(
						payload -> "《" + payload.getTitle() + "》 " + payload.getLink() + getProperty("line.separator"))
				.handle(Files.outboundAdapter(new File("e:/springblog"))
						.fileExistsMode(FileExistsMode.APPEND)
						.charset("UTF-8")
						.fileNameGenerator(message -> "engineering.txt")
						.get())
				.get();
	}

	@Bean
	public IntegrationFlow newsFlow() {
		return IntegrationFlows.from(MessageChannels.queue("newsChannel", 10))
				.<SyndEntry, String> transform(
						payload -> "《" + payload.getTitle() + "》 " + payload.getLink() + getProperty("line.separator"))
				.enrichHeaders( //1
						Mail.headers()
						.subject("來自Spring的新聞")
						.to("[email protected]")
						.from("[email protected]"))
				.handle(Mail.outboundAdapter("smtp.126.com") //2
						.port(25)
						.protocol("smtp")
						.credentials("[email protected]", "******")
						.javaMailProperties(p -> p.put("mail.debug", "false")), e -> e.id("smtpOut"))
				.get();
	}

}