如何在带注释的组件 bean 中使用会话或请求范围的 bean？
How can I use a session or request-scoped bean in a component annotated bean?
在之前的问题中
我在 spring 集成和处理 TCP 套接字连接方面遇到了一些问题。
那个问题解决了，但是不幸的是出现了一个新问题......
我从客户那里收到了消息 - 到目前为止一切顺利 - 但现在我尝试使用现有的业务逻辑来处理消息，如下所示：
这是一个 class 来处理传入的套接字消息。通过 spring 集成
实施
import homebrew.something.MessageProcessor;
import lombok.extern.log4j.Log4j2;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.integration.annotation.MessageEndpoint;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.stereotype.Component;
@Log4j2
@Component
@MessageEndpoint
public class ClientSocketHandler {
@Autowired
private MessageProcessor messageProcessor;
@ServiceActivator(inputChannel = "toTcp")
public byte[] handleMessage(byte[] msg) {
byte[] msgToSend = messageProcessor.processMessage(msg);
return msgToSend;
}
}
这是绑定到 HTTP 会话的常规传输对象class
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.context.annotation.Scope;
import org.springframework.context.annotation.ScopedProxyMode;
@Component
@Scope(value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)
public class ASimpleTransferObject {
// Some fields,
// some getters and
// some setters
}
这里我们得到了我们的服务来处理来自 TCP 套接字的传入消息
import lombok.extern.log4j.Log4j2;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Log4j2
@Service
public class MessageProcessor {
@Autowired
private ASimpleTransferObject transferObject;
public byte[] processMessage(byte[] msg) {
// Do something with the message
return message;
}
}
如果我从客户端向服务器发送消息，则会抛出此异常：
ERROR org.springframework.integration.ip.tcp.connection.TcpNetConnection - Exception sending message: GenericMessage [payload=byte[0], headers={ip_tcp_remotePort=XXXX, ip_connectionId=view-localhost:XXXXX:YYYYY:AAAA-BBBB-CCCC, ip_localInetAddress=/127.0.0.1, ip_address=127.0.0.1, id=fd33bdd9-1af1-051f-3106-3f08af7bdd16, ip_hostname=view-localhost, timestamp=87236587436545}]
org.springframework.messaging.MessageHandlingException: error occurred during processing message in 'MethodInvokingMessageProcessor' [org.springframework.integration.handler.MethodInvokingMessageProcessor@1b067e83]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.transferObject': Scope 'session' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
at org.springframework.integration.support.utils.IntegrationUtils.wrapInHandlingExceptionIfNecessary(IntegrationUtils.java:192) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:111) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.ServiceActivatingHandler.handleRequestMessage(ServiceActivatingHandler.java:104) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:134) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:62) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:115) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:133) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:106) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:72) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:570) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:187) ~[spring-messaging-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:233) ~[spring-messaging-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:47) ~[spring-messaging-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.messaging.core.AbstractMessagingTemplate.sendAndReceive(AbstractMessagingTemplate.java:46) ~[spring-messaging-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.integration.core.MessagingTemplate.sendAndReceive(MessagingTemplate.java:97) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.gateway.MessagingGatewaySupport.doSendAndReceive(MessagingGatewaySupport.java:522) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.gateway.MessagingGatewaySupport.sendAndReceiveMessage(MessagingGatewaySupport.java:493) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.ip.tcp.TcpInboundGateway.doOnMessage(TcpInboundGateway.java:127) ~[spring-integration-ip-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.ip.tcp.TcpInboundGateway.onMessage(TcpInboundGateway.java:105) ~[spring-integration-ip-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.ip.tcp.connection.TcpNetConnection.run(TcpNetConnection.java:216) [spring-integration-ip-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.transferObject': Scope 'session' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:368) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:675) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at homebrew.something.ASimpleTransferObject$$EnhancerBySpringCGLIB$c84ec3.getSessionKey(<generated>) ~[classes/:?]
....
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.CustomizableTraceInterceptor.invokeUnderTrace(CustomizableTraceInterceptor.java:256) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.AbstractTraceInterceptor.invoke(AbstractTraceInterceptor.java:131) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:129) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:112) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference.access[=13=]0(MethodReference.java:55) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:386) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:92) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:117) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:375) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:171) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:156) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.invokeExpression(MessagingMethodInvokerHelper.java:637) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.fallbackToInvokeExpression(MessagingMethodInvokerHelper.java:630) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.processInvokeExceptionAndFallbackToExpressionIfAny(MessagingMethodInvokerHelper.java:614) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.invokeHandlerMethod(MessagingMethodInvokerHelper.java:585) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:477) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.process(MessagingMethodInvokerHelper.java:355) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:108) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
... 21 more
Caused by: java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
at org.springframework.web.context.request.RequestContextHolder.currentRequestAttributes(RequestContextHolder.java:131) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.context.request.SessionScope.get(SessionScope.java:55) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:356) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:675) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at homebrew.something.ASimpleTransferObject$$EnhancerBySpringCGLIB$c84ec3.getSessionKey(<generated>) ~[classes/:?]
....
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.CustomizableTraceInterceptor.invokeUnderTrace(CustomizableTraceInterceptor.java:256) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.AbstractTraceInterceptor.invoke(AbstractTraceInterceptor.java:131) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
....
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:129) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:112) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference.access[=13=]0(MethodReference.java:55) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:386) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:92) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:117) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:375) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:171) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:156) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.invokeExpression(MessagingMethodInvokerHelper.java:637) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.fallbackToInvokeExpression(MessagingMethodInvokerHelper.java:630) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.processInvokeExceptionAndFallbackToExpressionIfAny(MessagingMethodInvokerHelper.java:614) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.invokeHandlerMethod(MessagingMethodInvokerHelper.java:585) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:477) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.process(MessagingMethodInvokerHelper.java:355) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:108) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
... 21 more
我已经尝试将 RequestContextListener 放入我的 spring 配置
@Bean
public RequestContextListener requestContextListener() {
return new RequestContextListener();
}
但这并没有真正帮助。再次抛出相同的异常。
这个问题有解决方案吗？
非常感谢！
绝对不可能，因为TCP连接与HTTP连接完全没有关系。当我们处理从 HTTP 客户端发起的 HTTP 连接时，以及当我们在 HTTP 服务器中进行会话管理时，我们就有了会话上下文，例如Srvlet 容器。
TCP 连接以完全不同的方式启动，并且没有挂钩从管理器获取 HTTP 会话，因为没有与该会话相关的 HTTP 请求。
您可能需要了解有关 HTTP 及其会话状态的更多信息...
要点是 TCP 连接是在一个对 HTTP 一无所知的线程中完成的，只有当我们与 HTTP 线程和请求中的一些客户端会话令牌进行交互时，我们才能初始化会话范围。
我不确定如何帮助您，但您正在寻找的东西是不可能的，您不能在 HTTP 请求之外使用该会话范围。您需要重新考虑您的业务逻辑，以适应您的 TCP 请求。
在之前的问题中
这是一个 class 来处理传入的套接字消息。通过 spring 集成
实施import homebrew.something.MessageProcessor;
import lombok.extern.log4j.Log4j2;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.integration.annotation.MessageEndpoint;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.stereotype.Component;
@Log4j2
@Component
@MessageEndpoint
public class ClientSocketHandler {
@Autowired
private MessageProcessor messageProcessor;
@ServiceActivator(inputChannel = "toTcp")
public byte[] handleMessage(byte[] msg) {
byte[] msgToSend = messageProcessor.processMessage(msg);
return msgToSend;
}
}
这是绑定到 HTTP 会话的常规传输对象class
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.context.annotation.Scope;
import org.springframework.context.annotation.ScopedProxyMode;
@Component
@Scope(value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)
public class ASimpleTransferObject {
// Some fields,
// some getters and
// some setters
}
这里我们得到了我们的服务来处理来自 TCP 套接字的传入消息
import lombok.extern.log4j.Log4j2;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Log4j2
@Service
public class MessageProcessor {
@Autowired
private ASimpleTransferObject transferObject;
public byte[] processMessage(byte[] msg) {
// Do something with the message
return message;
}
}
如果我从客户端向服务器发送消息，则会抛出此异常：
ERROR org.springframework.integration.ip.tcp.connection.TcpNetConnection - Exception sending message: GenericMessage [payload=byte[0], headers={ip_tcp_remotePort=XXXX, ip_connectionId=view-localhost:XXXXX:YYYYY:AAAA-BBBB-CCCC, ip_localInetAddress=/127.0.0.1, ip_address=127.0.0.1, id=fd33bdd9-1af1-051f-3106-3f08af7bdd16, ip_hostname=view-localhost, timestamp=87236587436545}]
org.springframework.messaging.MessageHandlingException: error occurred during processing message in 'MethodInvokingMessageProcessor' [org.springframework.integration.handler.MethodInvokingMessageProcessor@1b067e83]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.transferObject': Scope 'session' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
at org.springframework.integration.support.utils.IntegrationUtils.wrapInHandlingExceptionIfNecessary(IntegrationUtils.java:192) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:111) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.ServiceActivatingHandler.handleRequestMessage(ServiceActivatingHandler.java:104) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:134) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:62) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:115) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:133) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:106) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:72) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:570) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:187) ~[spring-messaging-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:233) ~[spring-messaging-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:47) ~[spring-messaging-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.messaging.core.AbstractMessagingTemplate.sendAndReceive(AbstractMessagingTemplate.java:46) ~[spring-messaging-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.integration.core.MessagingTemplate.sendAndReceive(MessagingTemplate.java:97) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.gateway.MessagingGatewaySupport.doSendAndReceive(MessagingGatewaySupport.java:522) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.gateway.MessagingGatewaySupport.sendAndReceiveMessage(MessagingGatewaySupport.java:493) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.ip.tcp.TcpInboundGateway.doOnMessage(TcpInboundGateway.java:127) ~[spring-integration-ip-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.ip.tcp.TcpInboundGateway.onMessage(TcpInboundGateway.java:105) ~[spring-integration-ip-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.ip.tcp.connection.TcpNetConnection.run(TcpNetConnection.java:216) [spring-integration-ip-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.transferObject': Scope 'session' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:368) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:675) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at homebrew.something.ASimpleTransferObject$$EnhancerBySpringCGLIB$c84ec3.getSessionKey(<generated>) ~[classes/:?]
....
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.CustomizableTraceInterceptor.invokeUnderTrace(CustomizableTraceInterceptor.java:256) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.AbstractTraceInterceptor.invoke(AbstractTraceInterceptor.java:131) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:129) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:112) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference.access[=13=]0(MethodReference.java:55) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:386) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:92) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:117) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:375) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:171) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:156) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.invokeExpression(MessagingMethodInvokerHelper.java:637) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.fallbackToInvokeExpression(MessagingMethodInvokerHelper.java:630) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.processInvokeExceptionAndFallbackToExpressionIfAny(MessagingMethodInvokerHelper.java:614) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.invokeHandlerMethod(MessagingMethodInvokerHelper.java:585) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:477) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.process(MessagingMethodInvokerHelper.java:355) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:108) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
... 21 more
Caused by: java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
at org.springframework.web.context.request.RequestContextHolder.currentRequestAttributes(RequestContextHolder.java:131) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.context.request.SessionScope.get(SessionScope.java:55) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:356) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:675) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at homebrew.something.ASimpleTransferObject$$EnhancerBySpringCGLIB$c84ec3.getSessionKey(<generated>) ~[classes/:?]
....
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.CustomizableTraceInterceptor.invokeUnderTrace(CustomizableTraceInterceptor.java:256) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.AbstractTraceInterceptor.invoke(AbstractTraceInterceptor.java:131) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
....
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:129) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:112) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference.access[=13=]0(MethodReference.java:55) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:386) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:92) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:117) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:375) ~[spring-expression-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:171) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:156) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.invokeExpression(MessagingMethodInvokerHelper.java:637) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.fallbackToInvokeExpression(MessagingMethodInvokerHelper.java:630) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.processInvokeExceptionAndFallbackToExpressionIfAny(MessagingMethodInvokerHelper.java:614) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.invokeHandlerMethod(MessagingMethodInvokerHelper.java:585) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:477) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.process(MessagingMethodInvokerHelper.java:355) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:108) ~[spring-integration-core-5.3.2.RELEASE.jar:5.3.2.RELEASE]
... 21 more
我已经尝试将 RequestContextListener 放入我的 spring 配置
@Bean
public RequestContextListener requestContextListener() {
return new RequestContextListener();
}
但这并没有真正帮助。再次抛出相同的异常。
这个问题有解决方案吗？
非常感谢！
绝对不可能，因为TCP连接与HTTP连接完全没有关系。当我们处理从 HTTP 客户端发起的 HTTP 连接时，以及当我们在 HTTP 服务器中进行会话管理时，我们就有了会话上下文，例如Srvlet 容器。
TCP 连接以完全不同的方式启动，并且没有挂钩从管理器获取 HTTP 会话，因为没有与该会话相关的 HTTP 请求。
您可能需要了解有关 HTTP 及其会话状态的更多信息...
要点是 TCP 连接是在一个对 HTTP 一无所知的线程中完成的，只有当我们与 HTTP 线程和请求中的一些客户端会话令牌进行交互时，我们才能初始化会话范围。
我不确定如何帮助您，但您正在寻找的东西是不可能的，您不能在 HTTP 请求之外使用该会话范围。您需要重新考虑您的业务逻辑，以适应您的 TCP 请求。