在 ExpressionEvaluatingRequestHandlerAdvice 的手册中，它明确表示，A typical use case for this advice might be with an <ftp:outbound-channel-adapter/>, perhaps to move the file to one directory if the transfer was successful, or to another directory if it fails.
但我无法弄清楚将有效负载从当前目录移动到另一个目录的表达式。
此示例只是删除或重命名文件：
<bean class="org.springframework.integration.handler.advice.ExpressionEvaluatingRequestHandlerAdvice">
<property name="onSuccessExpression" value="payload.delete()" />
<property name="successChannel" ref="afterSuccessDeleteChannel" />
<property name="onFailureExpression" value="payload.renameTo(new java.io.File(payload.absolutePath + '.failed.to.send'))" />
<property name="failureChannel" ref="afterFailRenameChannel" />
</bean>
如何做到这一点？
编辑
根据 Gary 的建议，这是新的尝试：
设法将表达式更改为"T(java.nio.file.Files).move(payload.path, new java.io.File(new java.io.File('sent'), payload.name).path, T(java.nio.file.StandardCopyOption).REPLACE_EXISTING)"，但仍然出现错误Method move(java.lang.String,java.lang.String,java.nio.file.StandardCopyOption) cannot be found on java.nio.file.Files type
代码是，
@Bean
@ServiceActivator(inputChannel = "toSftpChannel", adviceChain = "expressionAdvice")
public MessageHandler uploadHandler() {
SftpMessageHandler handler = new SftpMessageHandler(sftpSessionFactory());
handler.setRemoteDirectoryExpression(new LiteralExpression(outRemoteDirectory));
handler.setFileNameGenerator(new FileNameGenerator() {
@Override
public String generateFileName(Message<?> message) {
if (message.getPayload() instanceof File) {
return ((File) message.getPayload()).getName();
} else {
throw new IllegalArgumentException("File expected as payload.");
}
}
});
return handler;
}
@MessagingGateway()
public interface UploadGateway {
@Gateway(requestChannel = "toSftpChannel")
void upload(File file);
}
@Bean
public String onUploadSuccessExpression() {
return "T(java.nio.file.Files).move(payload.path, new java.io.File(new java.io.File('sent'), payload.name).path, T(java.nio.file.StandardCopyOption).REPLACE_EXISTING)";
}
@Bean
public String onUploadFailedExpression() {
return "payload";
}
@Bean
public Advice expressionAdvice() {
ExpressionEvaluatingRequestHandlerAdvice expressionEvaluatingRequestHandlerAdvice = new ExpressionEvaluatingRequestHandlerAdvice();
expressionEvaluatingRequestHandlerAdvice.setOnSuccessExpressionString(onUploadSuccessExpression());
expressionEvaluatingRequestHandlerAdvice.setSuccessChannelName("uploadSuccessChannel");
expressionEvaluatingRequestHandlerAdvice.setOnFailureExpressionString(onUploadFailedExpression());
expressionEvaluatingRequestHandlerAdvice.setFailureChannelName("uploadFailedChannel");
expressionEvaluatingRequestHandlerAdvice.setTrapException(true);
expressionEvaluatingRequestHandlerAdvice.setPropagateEvaluationFailures(true);
return expressionEvaluatingRequestHandlerAdvice;
}
upload方法 from被UploadGateway调用。
堆栈跟踪是，
"main@1" prio=5 tid=0x1 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at org.springframework.integration.handler.advice.ExpressionEvaluatingRequestHandlerAdvice.evaluateSuccessExpression(ExpressionEvaluatingRequestHandlerAdvice.java:241)
at org.springframework.integration.handler.advice.ExpressionEvaluatingRequestHandlerAdvice.doInvoke(ExpressionEvaluatingRequestHandlerAdvice.java:214)
at org.springframework.integration.handler.advice.AbstractRequestHandlerAdvice.invoke(AbstractRequestHandlerAdvice.java:70)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy81.handleRequestMessage(Unknown Source:-1)
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.doInvokeAdvisedRequestHandler(AbstractReplyProducingMessageHandler.java:127)
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:112)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:127)
at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:148)
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:121)
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:89)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:423)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:373)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115)
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45)
at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:105)
at org.springframework.messaging.core.AbstractMessageSendingTemplate.convertAndSend(AbstractMessageSendingTemplate.java:143)
at org.springframework.messaging.core.AbstractMessageSendingTemplate.convertAndSend(AbstractMessageSendingTemplate.java:135)
at org.springframework.integration.gateway.MessagingGatewaySupport.send(MessagingGatewaySupport.java:392)
at org.springframework.integration.gateway.GatewayProxyFactoryBean.invokeGatewayMethod(GatewayProxyFactoryBean.java:481)
at org.springframework.integration.gateway.GatewayProxyFactoryBean.doInvoke(GatewayProxyFactoryBean.java:433)
at org.springframework.integration.gateway.GatewayProxyFactoryBean.invoke(GatewayProxyFactoryBean.java:424)
at org.springframework.integration.gateway.GatewayCompletableFutureProxyFactoryBean.invoke(GatewayCompletableFutureProxyFactoryBean.java:65)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy87.upload(Unknown Source:-1)