java - 如何从 bean.xml 获取 bean 值

Question

我们正在编写 3 个消费者，用于使用 Apache Camel 和 Spring 使用 Activemq 队列名称作为 ThermalMap 消费消息。

我是 Spring 的新手，我尝试从 bean.xml 获取特定的 beanId("amqLinkId") 值。为此，我编写了以下 3 个文件。

变量声明.java

public class VariablesDeclarations {
private String amqLink;
public String getAmqLink() {
return amqLink;
}
public void setAmqLink(String amqLink) {
this.amqLink = amqLink;
}
}

FirstConsumer.java

import org.apache.camel.CamelContext;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class FirstConsumer {
        public static void main(String[] args) {
     ApplicationContext contextObject=new ClassPathXmlApplicationContext("bean.xml");
        //Forwarding cursor to ConsumersMiddileWare class using CamelContext
        CamelContext camelObject=contextObject.getBean("activeContext", CamelContext.class);
        System.out.println("H");
}
} 

ConsumersMiddileware.java

import org.apache.camel.builder.RouteBuilder;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class ConsumersMiddileWare extends RouteBuilder{
@Override
public void configure() throws Exception {
    System.out.println("Bye");
    BeanFactory beanFactory=new ClassPathXmlApplicationContext(new String[]{"bean.xml"});
    VariablesDeclarations vd=(VariablesDeclarations) beanFactory.getBean("amqLinkId");
    System.out.println(vd.getAmqLink());
}
 }

bean.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"
xsi:schemaLocation="
                    http://www.springframework.org/schema/beans     http://www.springframework.org/schema/beans/spring-beans.xsd
                    http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
                    http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core-5.5.0.xsd
                    ">

<!-- Creating camelContext element for forwarding to another ConsumersMiddileware class -->
<camelContext id="activeContext" xmlns="http://camel.apache.org/schema/spring">
    <routeBuilder ref="consumerMiddileWareContext" />
</camelContext>
<bean id="consumerMiddileWareContext" class="ActivemqPackage.ConsumersMiddileWare"></bean>

<!-- Following bean created for getting variable values into classes-->
<bean id="amqLinkId" class="ActivemqPackage.VariablesDeclarations">
    <property name="amqLink" value="activemq:queue:ThermalMap"></property>
</bean>
</beans>

工作流程:

如果您运行FirstConsumer.java，它应该转发到ConsumersMiddileWare.java。我想从找到amqLinkId值bean.xml 并分配给任何 String 对象。

如果我找到了amqLinkId值，稍后我想直接在ConsumersMiddileWare.java中编写以下代码

  String activeMqURI=vd.getAmqLink();
  from( activeMqURI).to("bean:activemqProcessor?method=processMessage");

问题:

如果我触发FirsrConsumer.java，它会转发到ConsumersMiddileWare.java。它会继续打印Bye而不是打印amqLinkId 值如下所示。

 Bye
 Bye
 Bye
 Bye
 .
 .

谁能解释清楚。

谢谢

Answer 1

您可以使用 SpringRouteBuilder 来代替 RouteBuilder。这个类有一些额外的方法来从spring应用程序上下文(例如spring xml文件)获取bean

public class ConsumersMiddileWare extends SpringRouteBuilder{
@Override
public void configure() throws Exception {
    VariablesDeclarations vd = lookup("amqLinkId", VariablesDeclarations.class)' 
 }

替代方法是在常规 RouteBuilder 中使用camelContext.getRegistry

public class ConsumersMiddileWare extends RouteBuilder{
@Override
public void configure() throws Exception {
    VariablesDeclarations vd = context().getRegistry().lookup("amqLinkId", VariablesDeclarations.class)' 
 }