java - Bean 属性 'channelIdentifierMap' 不可写或具有无效的 setter 方法

Question

我正在使用 Spring 集成 4.0，并尝试创建一个有 2 个消息 channel 的 PayloadTypeRouter 对象 - 一个用于字符串有效负载，一个用于整数有效负载。我试图通过以下 java 代码来做到这一点:

package MessageExamples;
import org.springframework.messaging.Message;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.integration.router.PayloadTypeRouter;
public class Test {
public static void main(String[] args) {
QueueChannel q_channel1=new QueueChannel();
QueueChannel q_channel2=new QueueChannel();
ApplicationContext ctx= new ClassPathXmlApplicationContext("SpringIntegration.xml");
PayloadTypeRouter r= (PayloadTypeRouter) ctx.getBean("payloadTypeRouter");
}}

具有以下配置:

<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/integration
http://www.springframework.org/schema/integration/spring-integration.xsd">
    <bean id="payloadTypeRouter"
    class="org.springframework.integration.router.PayloadTypeRouter">
    <property name="channelIdentifierMap">
    <map>
    <entry key="java.lang.String" value-ref="stringChannel"/>
    <entry key="java.lang.Integer" value-ref="integerChannel"/>
    </map>
    </property>
    </bean>
    <int:channel id="stringChannel"/>
    <int:channel id="integerChannel"/>
    </beans>

当我尝试运行它时，收到以下错误消息:

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'payloadTypeRouter' defined in class path resource [SpringIntegration.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'channelIdentifierMap' of bean class [org.springframework.integration.router.PayloadTypeRouter]: Bean property 'channelIdentifierMap' is not writable or has an invalid setter method.

我注意到 AbstractMessageRouter 在 Spring Integration 4.0 版本中不包含映射 setter ，尽管它在以前的版本中包含映射 setter 。如何配置这种路由器？

Answer 1

我认为您不需要最后的 channel 定义。根据文档，您只需要:

<bean id="payloadTypeRouter"
      class="org.springframework.integration.router.PayloadTypeRouter">
    <property name="channelIdentifierMap">
        <map>
            <entry key="java.lang.String" value-ref="stringChannel"/>
            <entry key="java.lang.Integer" value-ref="integerChannel"/>
        </map>
    </property>
</bean>

或者，等效的定义:

<int:payload-type-router input-channel="routingChannel">
    <int:mapping type="java.lang.String" channel="stringChannel" />
    <int:mapping type="java.lang.Integer" channel="integerChannel" />
</int:payload-type-router>