Camel send multipart/form-data request

问题

I have an app, that sends a multipart/form-data & an app that recieves multipart/form-data request.

Processing in reciever:

    InputStreamCache postBody = exchange.getIn().getBody(InputStreamCache.class);
    MultipartUploadContext mux = new MultipartUploadContext(postBody, exchange.getIn().getHeader("Content-Type",String.class));
    Map<String,Object> params = mux.parseRequest();

Parsing a request, send from Postman/Swagger works fine. I have troubles integrating my camel-sender with my camel reciever.

Here is the sender route:

from("direct:uploadFileToRest").routeId("uploadFileToRest").
    process("uploadFileRequestProcessor").
    setHeader(Exchange.HTTP_METHOD, simple("POST")).
    setHeader(Exchange.CONTENT_TYPE, constant("multipart/form-data")).
    to("myrecieverapp/full_upload").
    id("fileUploadRestSending").
    log(LoggingLevel.DEBUG, "RESPONSE BODY ${body}").
end();

The sender processor:

MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder
                .create()
                .addTextBody("name", "SomeName")
                .addBinaryBody("content", array_with_byte_content_here);
exchange.getOut().setBody(multipartEntityBuilder.build());

The following error occures:

 No body available of type: java.io.InputStream but has value: org.apache.http.entity.mime.MultipartFormEntity@35315261 of type: org.apache.http.entity.mime.MultipartFormEntity on: Message[ID-VRN26-1529401997491-0-3]. Caused by: No type converter available to convert from type: org.apache.http.entity.mime.MultipartFormEntity to the required type: java.io.InputStream with value org.apache.http.entity.mime.MultipartFormEntity@35315261.

After looking up for the same issue, I found up a recommendation to change out body to:

 exchange.getOut().setBody(multipartEntityBuilder.build().getContent());

However,it causes issues on reciever side:

the request was rejected because no multipart boundary was found\r\n\tat org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:990)\r\n\tat org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310)\r\n\tat org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334)\r\n\tat ru.cinimex.abb.fileuploader.util.MultipartUploadContext.parseRequest(MultipartUploadContext.java:29)\r\n\tat ru.cinimex.abb.fileuploader.camel.processors.ValidateFullUploadRequestProcessor.process(ValidateFullUploadRequestProcessor.java:33)\r\n\tat org.apache.camel.processor.DelegateSyncProcessor.process(DelegateSyncProcessor.java:63)\r\n\tat org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548)\r\n\tat

I've read theese posts:

http://hilton.org.uk/blog/camel-multipart-form-data

Apache Camel multipart route

but couldn't find a solution

Camel version: org.apache.camel:camel-cxf:2.21.0.000033-fuse-000001-redhat-1

回答1:

You need to set Content-Type header with correct boundary, which is generated in MultipartEntityBuilder. Modify your sender processor to set this header.

HttpEntity resultEntity = multipartEntityBuilder.build();
exchange.getOut().setHeader(Exchange.CONTENT_TYPE, resultEntity.getContentType().getValue());
exchange.getOut().setBody(resultEntity.getContent());

来源：https://stackoverflow.com/questions/50925694/camel-send-multipart-form-data-request

标签

java

apache-camel