【本人禿頂程式設計師】Spring Boot整合Java DSL
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Spring Integration Java DSL已經融合到Spring Integration Core 5.0,這是一個聰明而明顯的舉動,因為:
- 基於Java Config啟動新Spring專案的每個人都使用它
- SI Java DSL使您可以使用Lambdas等新的強大Java 8功能
- 您可以使用 基於IntegrationFlowBuilder的Builder模式構建流
讓我們看看基於ActiveMQ JMS的示例如何使用它。
Maven依賴:
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-activemq</artifactId> </dependency> <dependency> <groupId>org.springframework.integration</groupId> <artifactId>spring-integration-core</artifactId> </dependency> <dependency> <groupId>org.springframework.integration</groupId> <artifactId>spring-integration-jms</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.apache.activemq</groupId> <artifactId>activemq-kahadb-store</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.integration/spring-integration-java-dsl --> <dependency> <groupId>org.springframework.integration</groupId> <artifactId>spring-integration-java-dsl</artifactId> <version>1.2.3.RELEASE</version> </dependency> </dependencies>
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示例1:Jms入站閘道器
我們有以下ServiceActivator:
@Service public class ActiveMQEndpoint { @ServiceActivator(inputChannel = "inboundChannel") public void processMessage(final String inboundPayload) { System.out.println("Inbound message: "+inboundPayload); } }
如果您想使用SI Java DSL 將inboundPayload從Jms佇列傳送到Gateway風格的啟用器,那麼請使用DSL Jms工廠:
@Bean public DynamicDestinationResolver dynamicDestinationResolver() { return new DynamicDestinationResolver(); } @Bean public ActiveMQConnectionFactory connectionFactory() { return new ActiveMQConnectionFactory(); } @Bean public DefaultMessageListenerContainer listenerContainer() { final DefaultMessageListenerContainer defaultMessageListenerContainer = new DefaultMessageListenerContainer(); defaultMessageListenerContainer.setDestinationResolver(dynamicDestinationResolver()); defaultMessageListenerContainer.setConnectionFactory(connectionFactory()); defaultMessageListenerContainer.setDestinationName("jms.activeMQ.Test"); return defaultMessageListenerContainer; } @Bean public MessageChannel inboundChannel() { return MessageChannels.direct("inboundChannel").get(); } @Bean public JmsInboundGateway dataEndpoint() { return Jms.inboundGateway(listenerContainer()) .requestChannel(inboundChannel()).get(); }
通過dataEndpoint bean 返回JmsInboundGatewaySpec,您還可以向SI通道或Jms目標傳送回覆。檢視文件。
示例2:Jms訊息驅動的通道介面卡
如果您正在尋找替換訊息驅動通道介面卡的XML JMS配置,那麼JmsMessageDrivenChannelAdapter是一種適合您的方式:
@Bean
public DynamicDestinationResolver dynamicDestinationResolver() {
return new DynamicDestinationResolver();
}
@Bean
public ActiveMQConnectionFactory connectionFactory() {
return new ActiveMQConnectionFactory();
}
@Bean
public DefaultMessageListenerContainer listenerContainer() {
final DefaultMessageListenerContainer defaultMessageListenerContainer = new DefaultMessageListenerContainer();
defaultMessageListenerContainer.setDestinationResolver(dynamicDestinationResolver());
defaultMessageListenerContainer.setConnectionFactory(connectionFactory());
defaultMessageListenerContainer.setDestinationName("jms.activeMQ.Test");
return defaultMessageListenerContainer;
}
@Bean
public MessageChannel inboundChannel() {
return MessageChannels.direct("inboundChannel").get();
}
@Bean
public JmsMessageDrivenChannelAdapter dataEndpoint() {
final ChannelPublishingJmsMessageListener channelPublishingJmsMessageListener =
new ChannelPublishingJmsMessageListener();
channelPublishingJmsMessageListener.setExpectReply(false);
final JmsMessageDrivenChannelAdapter messageDrivenChannelAdapter = new
JmsMessageDrivenChannelAdapter(listenerContainer(), channelPublishingJmsMessageListener
);
messageDrivenChannelAdapter.setOutputChannel(inboundChannel());
return messageDrivenChannelAdapter;
}
與前面的示例一樣,入站有效負載如樣本1中一樣傳送給啟用器。
示例3:使用JAXB的Jms訊息驅動的通道介面卡
在典型的場景中,您希望通過Jms接受XML作為文字訊息,將其轉換為JAXB存根並在服務啟用器中處理它。我將向您展示如何使用SI Java DSL執行此操作,但首先讓我們為xml處理新增兩個依賴項:
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-xml</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
</dependency>
我們將通過JMS接受shiporders ,所以首先XSD命名為shiporder.xsd:
<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="shiporder">
<xs:complexType>
<xs:sequence>
<xs:element name="orderperson" type="xs:string"/>
<xs:element name="shipto">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string"/>
<xs:element name="address" type="xs:string"/>
<xs:element name="city" type="xs:string"/>
<xs:element name="country" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="item" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="title" type="xs:string"/>
<xs:element name="note" type="xs:string" minOccurs="0"/>
<xs:element name="quantity" type="xs:positiveInteger"/>
<xs:element name="price" type="xs:decimal"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="orderid" type="xs:string" use="required"/>
</xs:complexType>
</xs:element>
</xs:schema>
新增JAXB maven plugin 生成JAXB存根:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>2.3.1</version>
<executions>
<execution>
<id>xjc-schema1</id>
<goals>
<goal>xjc</goal>
</goals>
<configuration>
<!-- Use all XSDs under the west directory for sources here. -->
<sources>
<source>src/main/resources/xsds/shiporder.xsd</source>
</sources>
<!-- Package name of the generated sources. -->
<packageName>com.example.stubs</packageName>
<outputDirectory>src/main/java</outputDirectory>
<clearOutputDir>false</clearOutputDir>
</configuration>
</execution>
</executions>
</plugin>
我們已經準備好了存根類和一切,現在使用Jaxb magic的Java DSL JMS訊息驅動介面卡:
/**
* Sample 3: Jms message driven adapter with JAXB
*/
@Bean
public JmsMessageDrivenChannelAdapter dataEndpoint() {
final ChannelPublishingJmsMessageListener channelPublishingJmsMessageListener =
new ChannelPublishingJmsMessageListener();
channelPublishingJmsMessageListener.setExpectReply(false);
channelPublishingJmsMessageListener.setMessageConverter(new MarshallingMessageConverter(shipOrdersMarshaller()));
final JmsMessageDrivenChannelAdapter messageDrivenChannelAdapter = new
JmsMessageDrivenChannelAdapter(listenerContainer(), channelPublishingJmsMessageListener
);
messageDrivenChannelAdapter.setOutputChannel(inboundChannel());
return messageDrivenChannelAdapter;
}
@Bean
public Jaxb2Marshaller shipOrdersMarshaller() {
Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
marshaller.setContextPath("com.example.stubs");
return marshaller;
}
XML配置在Java中使用它可以為您提供如此強大的功能和靈活性。要完成此示例,inboundChannel的服務啟用器將如下所示:
/**
* Sample 3
* @param shiporder
*/
@ServiceActivator(inputChannel = "inboundChannel")
public void processMessage(final Shiporder shiporder) {
System.out.println(shiporder.getOrderid());
System.out.println(shiporder.getOrderperson());
}
要測試流,您可以使用以下XML通過JConsole傳送到JMS佇列:
<?xml version="1.0" encoding="UTF-8"?>
<shiporder orderid="889923"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="shiporder.xsd">
<orderperson>John Smith</orderperson>
<shipto>
<name>Ola Nordmann</name>
<address>Langgt 23</address>
<city>4000 Stavanger</city>
<country>Norway</country>
</shipto>
<item>
<title>Empire Burlesque</title>
<note>Special Edition</note>
<quantity>1</quantity>
<price>10.90</price>
</item>
<item>
<title>Hide your heart</title>
<quantity>1</quantity>
<price>9.90</price>
</item>
</shiporder>
有關如何使用ActiveMQ和JConsole的快速概述,請檢視本教程
示例4:具有JAXB和有效負載根路由的Jms訊息驅動的通道介面卡
另一種典型情況是接受XML作為JMS文字訊息,將其轉換為JAXB存根並根據有效負載根型別將有效負載路由到某個服務啟用器。當然SI Java DSL支援所有型別的路由,我將向您展示如何根據有效載荷型別進行路由。
首先,將以下XSD新增到shiporder.xsd所在的資料夾中,並將其命名為purchaseorder.xsd:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:tns="http://tempuri.org/PurchaseOrderSchema.xsd"
targetNamespace="http://tempuri.org/PurchaseOrderSchema.xsd"
elementFormDefault="qualified">
<xsd:element name="PurchaseOrder">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="ShipTo" type="tns:USAddress" maxOccurs="2"/>
<xsd:element name="BillTo" type="tns:USAddress"/>
</xsd:sequence>
<xsd:attribute name="OrderDate" type="xsd:date"/>
</xsd:complexType>
</xsd:element>
<xsd:complexType name="USAddress">
<xsd:sequence>
<xsd:element name="name" type="xsd:string"/>
<xsd:element name="street" type="xsd:string"/>
<xsd:element name="city" type="xsd:string"/>
<xsd:element name="state" type="xsd:string"/>
<xsd:element name="zip" type="xsd:integer"/>
</xsd:sequence>
<xsd:attribute name="country" type="xsd:NMTOKEN" fixed="US"/>
</xsd:complexType>
</xsd:schema>
然後新增到jaxb maven外掛配置:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>2.3.1</version>
<executions>
<execution>
<id>xjc-schema1</id>
<goals>
<goal>xjc</goal>
</goals>
<configuration>
<!-- Use all XSDs under the west directory for sources here. -->
<sources>
<source>src/main/resources/xsds/shiporder.xsd</source>
<source>src/main/resources/xsds/purchaseorder.xsd</source>
</sources>
<!-- Package name of the generated sources. -->
<packageName>com.example.stubs</packageName>
<outputDirectory>src/main/java</outputDirectory>
<clearOutputDir>false</clearOutputDir>
</configuration>
</execution>
</executions>
</plugin>
執行mvn clean install以生成新XSD的JAXB存根。現在承諾有效負載根對映:
@Bean
public Jaxb2Marshaller ordersMarshaller() {
Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
marshaller.setContextPath("com.example.stubs");
return marshaller;
}
/**
* Sample 4: Jms message driven adapter with Jaxb and Payload routing.
* @return
*/
@Bean
public JmsMessageDrivenChannelAdapter dataEndpoint() {
final ChannelPublishingJmsMessageListener channelPublishingJmsMessageListener =
new ChannelPublishingJmsMessageListener();
channelPublishingJmsMessageListener.setMessageConverter(new MarshallingMessageConverter(ordersMarshaller()));
final JmsMessageDrivenChannelAdapter messageDrivenChannelAdapter = new
JmsMessageDrivenChannelAdapter(listenerContainer(), channelPublishingJmsMessageListener
);
messageDrivenChannelAdapter.setOutputChannel(inboundChannel());
return messageDrivenChannelAdapter;
}
@Bean
public IntegrationFlow payloadRootMapping() {
return IntegrationFlows.from(inboundChannel()).<Object, Class<?>>route(Object::getClass, m->m
.subFlowMapping(Shiporder.class, sf->sf.handle((MessageHandler) message -> {
final Shiporder shiporder = (Shiporder) message.getPayload();
System.out.println(shiporder.getOrderperson());
System.out.println(shiporder.getOrderid());
}))
.subFlowMapping(PurchaseOrder.class, sf->sf.handle((MessageHandler) message -> {
final PurchaseOrder purchaseOrderType = (PurchaseOrder) message.getPayload();
System.out.println(purchaseOrderType.getBillTo().getName());
}))
).get();
}
注意payloadRootMapping bean,讓我們解釋一下重要的部分:
- <Object, Class<?>> route - 表示來自inboundChannel的輸入將是Object,並且將根據Class
<?>執行路由 - subFlowMapping(Shiporder.class… - ShipOders的處理。
- subFlowMapping(PurchaseOrder.class … - 處理PurchaseOrders。
要測試ShipOrder有效負載,請使用示例3中的XML,以測試PurchaseOrder有效負載,使用以下XML:
<?xml version="1.0" encoding="utf-8"?>
<PurchaseOrder OrderDate="1900-01-01" xmlns="http://tempuri.org/PurchaseOrderSchema.xsd">
<ShipTo country="US">
<name>name1</name>
<street>street1</street>
<city>city1</city>
<state>state1</state>
<zip>1</zip>
</ShipTo>
<ShipTo country="US">
<name>name2</name>
<street>street2</street>
<city>city2</city>
<state>state2</state>
<zip>-79228162514264337593543950335</zip>
</ShipTo>
<BillTo country="US">
<name>name1</name>
<street>street1</street>
<city>city1</city>
<state>state1</state>
<zip>1</zip>
</BillTo>
</PurchaseOrder>
應根據subflow 子流Map路由兩個有效載荷。
示例5:IntegrationFlowAdapter
除了企業整合模式的其他實現(check them out)),我需要提到IntegrationFlowAdapter。通過擴充套件此類並實現buildFlow方法,如:
[url=https://bitbucket.org/Component/]@Component[/url]
public class MyFlowAdapter extends IntegrationFlowAdapter {
@Autowired
private ConnectionFactory rabbitConnectionFactory;
@Override
protected IntegrationFlowDefinition<?> buildFlow() {
return from(Amqp.inboundAdapter(this.rabbitConnectionFactory, "myQueue"))
.<String, String>transform(String::toLowerCase)
.channel(c -> c.queue("myFlowAdapterOutput"));
}
你可以將bean的重複宣告包裝成一個元件並給它們所需的流量。然後可以配置這樣的元件並將其作為一個類例項提供給呼叫程式碼!
因此,讓我們舉例說明這個repo中的示例3更短一些,併為所有JmsEndpoints定義基類,並在其中定義重複bean:
public class JmsEndpoint extends IntegrationFlowAdapter {
private String queueName;
private String channelName;
private String contextPath;
/**
* @param queueName
* @param channelName
* @param contextPath
*/
public JmsEndpoint(String queueName, String channelName, String contextPath) {
this.queueName = queueName;
this.channelName = channelName;
this.contextPath = contextPath;
}
@Override
protected IntegrationFlowDefinition<?> buildFlow() {
return from(Jms.messageDrivenChannelAdapter(listenerContainer())
.jmsMessageConverter(new MarshallingMessageConverter(shipOrdersMarshaller()))
).channel(channelName);
}
@Bean
public Jaxb2Marshaller shipOrdersMarshaller() {
Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
marshaller.setContextPath(contextPath);
return marshaller;
}
@Bean
public DynamicDestinationResolver dynamicDestinationResolver() {
return new DynamicDestinationResolver();
}
@Bean
public ActiveMQConnectionFactory connectionFactory() {
return new ActiveMQConnectionFactory();
}
@Bean
public DefaultMessageListenerContainer listenerContainer() {
final DefaultMessageListenerContainer defaultMessageListenerContainer = new DefaultMessageListenerContainer();
defaultMessageListenerContainer.setDestinationResolver(dynamicDestinationResolver());
defaultMessageListenerContainer.setConnectionFactory(connectionFactory());
defaultMessageListenerContainer.setDestinationName(queueName);
return defaultMessageListenerContainer;
}
@Bean
public MessageChannel inboundChannel() {
return MessageChannels.direct(channelName).get();
}
}
現在宣告特定佇列的Jms端點很容易:
@Bean
public JmsEndpoint jmsEndpoint() {
return new JmsEndpoint("jms.activeMQ.Test", "inboundChannel", "com.example.stubs");
}
inboundChannel的服務啟用器:
/**
* Sample 3, 5
* @param shiporder
*/
@ServiceActivator(inputChannel = "inboundChannel")
public void processMessage(final Shiporder shiporder) {
System.out.println(shiporder.getOrderid());
System.out.println(shiporder.getOrderperson());
}
您不應該錯過在專案中使用IntegrationFlowAdapter。我喜歡它的概念。
我最近在Embedit的新的基於Spring Boot的專案中開始使用Spring Integration Java DSL 。即使有一些配置,我發現它非常有用。
- 它很容易除錯。不新增像wiretap這樣的配置。
- 閱讀起來要容易得多。是的,即使是lambdas!
- 它很強大。在Java配置中,您現在有很多選擇。