Apache camel Apache camel sftp org.Apache.camel.NoTypeConversionAvailableException:没有可用于转换java.io.InputStream的类型转换器

目前由于类型转换，我一直在从ftp服务器下载文件

因此，下面提到的路由是从一个管道中调用的，该管道的主体已经设置了我的自定义POJO。自定义pojo如下所示：

public class DirectoryLocationListing {

    private String domainName;

    private String countryCode;

    private String productName;

    private String profileId;

    private String directoryLocation;

sftp的路径如下所示，其中我从特定服务器的目录获取所有文件，并将它们保留在本地文件路径上

 <route id="route5">
        <from uri="direct:sftpGetCDRs"/>
        <from uri="sftp://{{HOST}}//home/admin/ROSS_PULL_CDR/resellers/${body.directoryLocation}/?noop=true&amp;streamDownload=true&amp;username={{USER}}&amp;password={{PASSWD}}"/>
        <to uri="file://{{DB_DIR_LOC}}/temp/?fileName=${body.directoryLocation}/&amp;autoCreate=true"/>
 </route>

如果有人遇到同样的问题，请提供指导。 所以类型转换可能是必需的，但我认为在这种情况下不需要

**更新**

使用Poll后，我的路线如下：

 <route id="route5">
        <from uri="direct:sftpGetCDRs"/>
        <process ref="sftpGetDirLocation"/>
        <log message="property ${exchangeProperty.ftpGetDirectory}"/>
        <pollEnrich uri="sftp://{{HOST}}//home/admin/ROSS_PULL_CDR/resellers/${exchangeProperty.ftpGetDirectory}/?noop=true&amp;streamDownload=true&amp;username={{USER}}&amp;password={{PASSWD}}" timeout="0"/>
        <to uri="file://{{DB_DIR_LOC}}/temp/?fileName=${body.directoryLocation}/&amp;autoCreate=true"/>
        </route>

然而，我的假设是，在这次更改之后，它将保留它从URI获得的用于sftp的任何内容（可能是文件），并将其作为主体保留。 相反，我看到身体是空的

Message History
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[_route1           ] [_route1           ] [quartz2://spring?cron=0+*+*+%3F+*+*                                           ] [       657]
[_route2           ] [_choice1          ] [when[simple{${body.domainName} != null and ${body.countryCode} !=
                                null] [       572]
[_route2           ] [_to4              ] [bean:pullCDRProcessorWithFTP?method=createTemporaryDirectoryWithDirLoc        ] [         2]
[_route2           ] [_log6             ] [log                                                                           ] [         7]
[_route2           ] [_to4              ] [direct:sftpGetCDRs                                                            ] [       523]
[route5            ] [process1          ] [ref:sftpGetDirLocation                                                        ] [         0]
[route5            ] [log1              ] [log                                                                           ] [         1]
[route5            ] [pollEnrich1       ] [pollEnrich[sftp://10.91.142.11//home/admin/ROSS_PULL_CDR/resellers/${exchangeP] [       514]
[route5            ] [log2              ] [log                                                                           ] [         0]
[route5            ] [to1               ] [file://C:/EXAMPLE/export/home/resellerid/wmcdr/cdr/temp/?fileName=${body.director] [         0]

Exchange
---------------------------------------------------------------------------------------------------------------------------------------
Exchange[
    Id                  ID-IGL70051-57920-1550721464331-0-4
    ExchangePattern     InOnly
    Headers             {breadcrumbId=ID-IGL70051-57920-1550721464331-0-1, calendar=null, CamelFileName=null, CamelRedelivered=false, CamelRedeliveryCounter=0, CamelToEndpoint=sftp://10.91.142.11//home/admin/ROSS_PULL_CDR/resellers/$%7BexchangeProperty.ftpGetDirectory%7D/?noop=true&password=tcpip123&streamDownload=true&username=admin, fireTime=Thu Feb 21 09:28:00 IST 2019, jobDetail=JobDetail 'Camel_camelContext-f6f63d02-4688-4b3f-b3ca-b206a61cbe9f.spring':  jobClass: 'org.apache.camel.component.quartz2.CamelJob concurrentExectionDisallowed: false persistJobDataAfterExecution: false isDurable: false requestsRecovers: false, jobInstance=org.apache.camel.component.quartz2.CamelJob@363935fd, jobRunTime=-1, mergedJobDataMap=org.quartz.JobDataMap@f7fbba19, nextFireTime=Thu Feb 21 09:29:00 IST 2019, previousFireTime=null, refireCount=0, result=null, scheduledFireTime=Thu Feb 21 09:28:00 IST 2019, scheduler=org.quartz.impl.StdScheduler@5bf7fd08, trigger=Trigger 'Camel_camelContext-f6f63d02-4688-4b3f-b3ca-b206a61cbe9f.spring':  triggerClass: 'org.quartz.impl.triggers.CronTriggerImpl calendar: 'null' misfireInstruction: 1 nextFireTime: Thu Feb 21 09:29:00 IST 2019, triggerGroup=Camel_camelContext-f6f63d02-4688-4b3f-b3ca-b206a61cbe9f, triggerName=spring}
    BodyType            null
    Body                [Body is null]
]

因此，例外情况是

Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------
org.apache.camel.component.file.GenericFileOperationFailedException: Cannot write null body to file: C:\EXAMPLE\export\home\resellerid\wmcdr\cdr\temp
    at org.apache.camel.component.file.FileOperations.storeFile(FileOperations.java:205)

---

在我看来，代码中有三个问题

您正在向

route5

发送类型为

DirectoryLocationListing

的交换，您希望

sftp

组件将该消息与来自

定义的第二条
一起使用。它坏了。当
SFTP
组件下载文件时，exchange上的主体将被实际文件（类型为
org.apache.camel.component.file.GenericFile
）替换，并且您将丢失上一次交换中的
DirectoryLocationListing
对象。如果您的pojo cam设置在车身以外的其他位置，这是一个很好的选择

在当前情况下，在路由结束时，您希望从

sftp

端点获得一个文件，但实际交付给您的是与

DirectoryLocationListing

类型的主体进行的交换（您的sftp组件不起作用）。对于Camel来说，没有办法做到这一点并将其持久化到磁盘。这正是它所抱怨的

2.1。一旦您解决了这个问题（并且您的SFTP组件开始工作），您将遇到下一种情况，即传递到

to

端点的消息现在是一个文件，您需要以某种方式在exchange中保留

directoryLocation

，直到路由结束

to

定义中的

fileName

参数指向目录。这行不通。您必须使用动态端点定义

我不熟悉Camel的XML DSL。因此，我将展示如何使用JavaDSL实现这一点。对于brewity，我将避免使用SFTP，而是使用

文件

组件。我们将尝试一次性解决所有这些问题

路线定义

from("direct:test")
            .routeId("route5")
            .log("=> body.directoryLocation is: ${body.directoryLocation}") //Just to see if we can read the directoryLocation property from the POJO
            .process(exchange -> exchange.setProperty("WriteTargetDirectory",exchange.getIn().getBody(DirectoryListing.class).directoryLocation)) //Move directoryLocation property to an exchange property  named WriteTargetDirectory
            .pollEnrich()
            .simple("file://source/${exchangeProperty.WriteTargetDirectory}/?noop=true")//Poll enrich magic here!
            .log("=> I still have the target directory location as : ${exchangeProperty.WriteTargetDirectory}")
            .log("=> I just received file [${in.header." + Exchange.FILE_NAME + "}] and will write it as [${exchangeProperty.WriteTargetDirectory}/${in.header." + Exchange.FILE_NAME + "}]" )
            .toD("file://destination/${exchangeProperty.WriteTargetDirectory}/");

目录列表

类

public class DirectoryListing {
        String directoryLocation;
        public DirectoryListing(String directoryLocation) {
            this.directoryLocation = directoryLocation;
        }
        public String getDirectoryLocation() {
            return directoryLocation;
        }
}

路由测试代码

template.sendBody("direct:test",new DirectoryListing("IN/healthyindia/"));

测试日志

[                          main] DefaultCamelContext            INFO  Apache Camel 2.23.1 (CamelContext: camel-1) started in 0.203 seconds
[                          main] route5                         INFO  => body.directoryLocation is: IN/healthyindia/
[                          main] FileEndpoint                   INFO  Endpoint is configured with noop=true so forcing endpoint to be idempotent as well
[                          main] FileEndpoint                   INFO  Using default memory based idempotent repository with cache max size: 1000
[                          main] route5                         INFO  => I still have the target directory location as : IN/healthyindia/
[                          main] route5                         INFO  => I just received file [test.txt] and will write it as [destination/IN/healthyindia//test.txt]
[                          main] MainRouteBuilderTest           INFO  ********************************************************************************
[                          main] MainRouteBuilderTest           INFO  Testing done: testRouteBuilder(JustTest.MainRouteBuilderTest)
[                          main] MainRouteBuilderTest           INFO  Took: 0.125 seconds (125 millis)

---

最后，在shelldragon的指导下，以下骆驼路线对我有效：

 <route id="route5">
            <from id="_from5" uri="direct:sftpGetCDRs"/>
            <process id="_process1" ref="sftpGetDirLocation"/>
            <log id="_log17" message="property ${exchangeProperty.ftpGetDirectory}"/>
            <pollEnrich id="_pollEnrich1" timeout="0" uri="sftp://{{HOST}}//home/admin/ROSS_PULL_CDR/resellers/temp/${body.directoryLocation}/?consumer.delay=60000&amp;username={{USER}}&amp;password={{PASSWD}}"/>
            <log id="_log18" message="${body}"/>
            <to id="_to2" uri="file://{{DB_DIR_LOC}}/temp/?fileName=${exchangeProperty.ftpGetDirectory}&amp;autoCreate=true"/>
        </route>

刚刚意识到

WriteTargetDirectory

是个坏名字。请用一些有意义的东西感谢雪龙提供的建议和纠正措施。我尝试将骆驼上下文XML DSL更新为问题中更新的内容。现在我面对的身体是空的错误。所以我身体上的内容必须为空，因为SFTP URI不起作用？或者我做得不正确？您可以通过将最后一个

上的
设置为
来查看发生了什么，从而允许写入空正文。您的源目录中是否有0个长度的文件？现在使用consumerDelay=60000解决了此问题。似乎远程服务器没有快速响应，我的属性也没有给它足够的时间响应。太好了！很高兴知道你终于成功了。
[                          main] DefaultCamelContext            INFO  Apache Camel 2.23.1 (CamelContext: camel-1) started in 0.203 seconds
[                          main] route5                         INFO  => body.directoryLocation is: IN/healthyindia/
[                          main] FileEndpoint                   INFO  Endpoint is configured with noop=true so forcing endpoint to be idempotent as well
[                          main] FileEndpoint                   INFO  Using default memory based idempotent repository with cache max size: 1000
[                          main] route5                         INFO  => I still have the target directory location as : IN/healthyindia/
[                          main] route5                         INFO  => I just received file [test.txt] and will write it as [destination/IN/healthyindia//test.txt]
[                          main] MainRouteBuilderTest           INFO  ********************************************************************************
[                          main] MainRouteBuilderTest           INFO  Testing done: testRouteBuilder(JustTest.MainRouteBuilderTest)
[                          main] MainRouteBuilderTest           INFO  Took: 0.125 seconds (125 millis)

 <route id="route5">
            <from id="_from5" uri="direct:sftpGetCDRs"/>
            <process id="_process1" ref="sftpGetDirLocation"/>
            <log id="_log17" message="property ${exchangeProperty.ftpGetDirectory}"/>
            <pollEnrich id="_pollEnrich1" timeout="0" uri="sftp://{{HOST}}//home/admin/ROSS_PULL_CDR/resellers/temp/${body.directoryLocation}/?consumer.delay=60000&amp;username={{USER}}&amp;password={{PASSWD}}"/>
            <log id="_log18" message="${body}"/>
            <to id="_to2" uri="file://{{DB_DIR_LOC}}/temp/?fileName=${exchangeProperty.ftpGetDirectory}&amp;autoCreate=true"/>
        </route>