Zip File DataFormat

Available as of Camel version 2.11

The Zip File Data Format is a message compression and de-compression format. Messages can be marshalled (compressed) to Zip files containing a single entry, and Zip files containing a single entry can be unmarshalled (decompressed) to the original file contents. This data format supports ZIP64, as long as Java 7 or later is being used].

ZipFile Options

The Zip File dataformat supports 4 options, which are listed below.

Name Default Java Type Description

usingIterator

false

Boolean

If the zip file has more then one entry, the setting this option to true, allows to work with the splitter EIP, to split the data using an iterator in a streaming mode.

allowEmptyDirectory

false

Boolean

If the zip file has more then one entry, setting this option to true, allows to get the iterator even if the directory is empty

preservePathElements

false

Boolean

If the file name contains path elements, setting this option to true, allows the path to be maintained in the zip file.

contentTypeHeader

false

Boolean

Whether the data format should set the Content-Type header with the type from the data format if the data format is capable of doing so. For example application/xml for data formats marshalling to XML, or application/json for data formats marshalling to JSon etc.

Spring Boot Auto-Configuration

When using Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-zipfile-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 5 options, which are listed below.

Name Description Default Type

camel.dataformat.zipfile.allow-empty-directory

If the zip file has more then one entry, setting this option to true, allows to get the iterator even if the directory is empty

false

Boolean

camel.dataformat.zipfile.content-type-header

Whether the data format should set the Content-Type header with the type from the data format if the data format is capable of doing so. For example application/xml for data formats marshalling to XML, or application/json for data formats marshalling to JSon etc.

false

Boolean

camel.dataformat.zipfile.enabled

Enable zipfile dataformat

true

Boolean

camel.dataformat.zipfile.preserve-path-elements

If the file name contains path elements, setting this option to true, allows the path to be maintained in the zip file.

false

Boolean

camel.dataformat.zipfile.using-iterator

If the zip file has more then one entry, the setting this option to true, allows to work with the splitter EIP, to split the data using an iterator in a streaming mode.

false

Boolean

ND

Marshal

In this example we marshal a regular text/XML payload to a compressed payload using Zip file compression, and send it to an ActiveMQ queue called MY_QUEUE.

from("direct:start")
    .marshal().zipFile()
    .to("activemq:queue:MY_QUEUE");

The name of the Zip entry inside the created Zip file is based on the incoming CamelFileName message header, which is the standard message header used by the file component. Additionally, the outgoing CamelFileName message header is automatically set to the value of the incoming CamelFileName message header, with the ".zip" suffix. So for example, if the following route finds a file named "test.txt" in the input directory, the output will be a Zip file named "test.txt.zip" containing a single Zip entry named "test.txt":

from("file:input/directory?antInclude=*/.txt")
    .marshal().zipFile()
    .to("file:output/directory");

If there is no incoming CamelFileName message header (for example, if the file component is not the consumer), then the message ID is used by default, and since the message ID is normally a unique generated ID, you will end up with filenames like ID-MACHINENAME-2443-1211718892437-1-0.zip. If you want to override this behavior, then you can set the value of the CamelFileName header explicitly in your route:

from("direct:start")
    .setHeader(Exchange.FILE_NAME, constant("report.txt"))
    .marshal().zipFile()
    .to("file:output/directory");

This route would result in a Zip file named "report.txt.zip" in the output directory, containing a single Zip entry named "report.txt".

Unmarshal

In this example we unmarshal a Zip file payload from an ActiveMQ queue called MY_QUEUE to its original format, and forward it for processing to the UnZippedMessageProcessor.

from("activemq:queue:MY_QUEUE")
    .unmarshal().zipFile()
    .process(new UnZippedMessageProcessor());

If the zip file has more then one entry, the usingIterator option of ZipFileDataFormat to be true, and you can use splitter to do the further work.

ZipFileDataFormat zipFile = new ZipFileDataFormat();
zipFile.setUsingIterator(true);

from("file:src/test/resources/org/apache/camel/dataformat/zipfile/?delay=1000&noop=true")
    .unmarshal(zipFile)
    .split(body(Iterator.class)).streaming()
        .process(new UnZippedMessageProcessor())
    .end();

Or you can use the ZipSplitter as an expression for splitter directly like this

from("file:src/test/resources/org/apache/camel/dataformat/zipfile?delay=1000&noop=true")
    .split(new ZipSplitter()).streaming()
        .process(new UnZippedMessageProcessor())
    .end();

Aggregate

Please note that this aggregation strategy requires eager completion check to work properly.

In this example we aggregate all text files found in the input directory into a single Zip file that is stored in the output directory.

from("file:input/directory?antInclude=*/.txt")
    .aggregate(constant(true), new ZipAggregationStrategy())
        .completionFromBatchConsumer().eagerCheckCompletion()
        .to("file:output/directory");

The outgoing CamelFileName message header is created using java.io.File.createTempFile, with the ".zip" suffix. If you want to override this behavior, then you can set the value of the CamelFileName header explicitly in your route:

from("file:input/directory?antInclude=*/.txt")
    .aggregate(constant(true), new ZipAggregationStrategy())
        .completionFromBatchConsumer().eagerCheckCompletion()
        .setHeader(Exchange.FILE_NAME, constant("reports.zip"))
        .to("file:output/directory");

Dependencies

To use Zip files in your camel routes you need to add a dependency on camel-zipfile which implements this data format.

If you use Maven you can just add the following to your pom.xml, substituting the version number for the latest & greatest release (see the download page for the latest versions).

<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-zipfile</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>