在spring集成中，如何捕捉不同的异常？

Question

null

public class TcpErrorHandler {
    public void onException(){
        System.out.println("Exception!!! ");
    } 
}

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有什么捕捉机制吗？

下面是我的bean配置中的一个片段：

<!-- Client side -->

<int:gateway id="gw"
    service-interface="hu.gmxdev.climaxreplica.service.SimpleGateway"
    default-request-channel="outputchannel" />

<int-ip:tcp-connection-factory id="client"
    type="client" host="localhost" port="10001" single-use="true"
    so-timeout="2000" deserializer="climaxDeserializer"
    interceptor-factory-chain="customInterceptorFactoryChain"/>

<int:channel id="outputchannel" />

<int-ip:tcp-outbound-gateway id="outGateway"
    request-channel="outputchannel" reply-channel="replychannel"
    connection-factory="client" request-timeout="2000" reply-timeout="2000" />

<int:service-activator input-channel="replychannel"
    method="reply" ref="echoService" id="serviceactivator">
</int:service-activator>

<int:channel id="replychannel"></int:channel>

<bean id="customInterceptorFactoryChain"
        class="org.springframework.integration.ip.tcp.connection.TcpConnectionInterceptorFactoryChain">
        <property name="interceptors">
            <array>
                <bean class="hu.gmxdev.climaxreplica.service.CustomInterceptorFactory"/>
            </array>
        </property>
</bean>

<!-- Error channel -->

<int-ip:tcp-connection-event-inbound-channel-adapter id="event"
    error-channel="errorChannel"
    event-types="org.springframework.integration.ip.tcp.connection.TcpConnectionExceptionEvent" />

<int:channel id="errorChannel"></int:channel>

<int:service-activator ref="tcpErrorHandler" method="onException"
    input-channel="errorChannel">
</int:service-activator>

下面是我的错误处理程序：

public class TcpErrorHandler {
    @Autowired
    private ApplicationContext appContext;

    public void onException(TcpConnectionExceptionEvent event){
        MainService mainService = appContext.getBean(MainService.class);
        mainService.setSuccess(3);
        System.out.println("Exception!!! ");
        System.out.println(event.getCause().getMessage());
    }
}

public class CustomInterceptor extends TcpConnectionInterceptorSupport{

    public CustomInterceptor () {
        System.out.println("catched_constructor1");
    }

    public CustomInterceptor (ApplicationEventPublisher applicationEventPublisher) {
        super(applicationEventPublisher);
        System.out.println("catched_constructor");
    }

    @Override
    public boolean onMessage(Message<?> message) {
        System.out.println("catched_message");
        return super.onMessage(message);
    }


    @Override
    public void send(Message<?> message){
        System.out.println("catched_send");
        MessageHeaders mh = message.getHeaders();
        try {
            super.send(message);
        }
        catch (Exception e) {
            System.out.println("catched_send_exception");
        }
    }

    @Override
    public void close() {
        String id = getConnectionId();
        System.out.println("catched_closed" + id);
        super.close();
    }

}

success = gateway.send("fooooooo");

Answer 1

您可以定义提供给入站适配器的错误通道。下面是一个例子：

    <int:channel id="error-channel"></int:channel>
    <int-ws:inbound-gateway id="gateway" error-channel="error-channel"
    request-channel="in"  marshaller="marshaller" unmarshaller="marshaller"
    reply-channel="out" />

现在，向下游抛出的所有异常都将被这个错误通道捕获。然后，您可以将此错误通道作为输入定义一个服务激活器：

 <int:service-activator  input-channel="error-channel"
        ref="exceptionHandler" method="handleError" output-channel="outError"></int:service-activator>

并且这个激活器引用定义错误处理逻辑的bean。