Spring Boot 和 Spring 集成。问题

我有一个 SpringBoot 应用程序。我有一个专用服务器，我将在其中通过 HTTP GET 请求读取数据。我为 Spring Integration 模块配置了 http-outbound-config.xml 文件。 当我运行以下代码时，一切都很好：

http-出站-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:int="http://www.springframework.org/schema/integration"
   xmlns:int-http="http://www.springframework.org/schema/integration/http"
   xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/integration https://www.springframework.org/schema/integration/spring-integration.xsd
    http://www.springframework.org/schema/integration/http https://www.springframework.org/schema/integration/http/spring-integration-http.xsd">

<int:channel id="requestChannel"/>
<int:channel id="replyChannel">
    <int:queue capacity='10'/>
</int:channel>

<int-http:outbound-gateway id="outboundGateway"
                           request-channel="requestChannel"
                           url="http://server/API.jsp?id=1"
                           http-method="GET"
                           expected-response-type="java.lang.String"
                           charset="UTF-8"
                           reply-channel="replyChannel"/>
</beans>

主要应用类：

package test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;
import ru.eco.products.waste.egr.Integration;

@SpringBootApplication
@ImportResource("/META-INF/spring/integration/http-outbound-config.xml")
public class Application {
    public static void main(String[] args) {
        Integration integration = new Integration();
        integration.start();
        SpringApplication.run(WasteWebClientApplication.class,
                              args
                             );
    }
    
}

整合类：

package test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.PollableChannel;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;

@Component
@Configuration
public class Integration { 
    public void start() {
        ClassPathXmlApplicationContext
               context = new ClassPathXmlApplicationContext("classpath:META-INF/spring/integration/http-outbound-config.xml");
        context.start();


        MessageChannel requestChannel = context.getBean("requestChannel", MessageChannel.class);
        PollableChannel replyChannel = context.getBean("replyChannel", PollableChannel.class);
        Message<?> message = MessageBuilder.withPayload("").build();
        requestChannel.send(message);
        
        Message<?> receivedMsg = replyChannel.receive();
        System.out.println("RESULT IS : " + receivedMsg.getPayload());
    }
}

但是，当我尝试自动装配 MessageChannel 和 PollableChannel 时，我收到一个空指针异常。

集成类（非工作示例）：

package test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.PollableChannel;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;

@Component
@Configuration
public class Integration {
    @Autowired
    @Qualifier("requestChannel")
    MessageChannel requestChannel;
    @Autowired
    @Qualifier("replyChannel")
    PollableChannel replyChannel;
    
    public void start() {
        Message<?> message = MessageBuilder.withPayload("").build();
        requestChannel.send(message);
        
        Message<?> receivedMsg = replyChannel.receive();
        System.out.println("RESULT IS : " + receivedMsg.getPayload()); 
    }
}

堆栈：Java 11、Spring Boot、thymeleaf + bootstrap。

1
投票

既然你这样做了

new Integration();

，你肯定不会有依赖注入，因为不涉及控制容器的反转。虽然完全不清楚为什么你需要那个

new ClassPathXmlApplicationContext("classpath:META-INF/spring/integration/http-outbound-config.xml")

 如果你已经做了 Spring Boot 并且正确的

@ImportResource

。

这是您已经使用 Spring Integration XML 配置的

@ImportResource

 所做的最佳方法。然后您需要访问

ApplicationContext

和

SpringApplication.run()

的

getBean(Integration.class)

 来调用您的

start()

 方法。然而你完全需要忘记

new Integratio()

。 Spring 将为此管理一个 bean

Integration

，然后依赖注入就会起作用。

异步模式可以通过Spring Integration中的

ExecutorChannel

来实现。因此，当您向此通道发送消息时，逻辑将在不同的线程上处理。然而，不清楚为什么你提出这样的要求，因为你仍然会通过那个

replyChannel.receive()

 来阻止......尽管这应该在单独的 SO 线程中解决。

Camel VS Spring Integration 问题不属于 StackOverflow 政策。

Thymeleaf 和 Bootstrap 在这个问题的上下文中具有误导性。

请考虑学习如何在此处正确提问：

https://stackoverflow.com/help/how-to-ask

还阅读一些有关依赖注入和控制反转的文档：

https://docs.spring.io/spring-framework/docs/current/reference/html/core.html#spring-core

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