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Revision as of 16:16, 29 June 2011
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Contents
Binary Types
There are a few extra things to consider when mapping to fields of type byte[] or Byte[].
Binary Formats - Base64 and Hex
EclipseLink supports marshalling and unmarshalling binary data in two different representation formats: base64Binary (default) and hexBinary. You can specify the desired binary format using the @XmlSchemaType annotation, or <xml-schema-type> element in EclipseLink OXM. The example below shows the result of marshalling the same byte[] to each of these formats.
Annotations
package example; import javax.xml.bind.annotation.*; @XmlRootElement public class BinaryData { @XmlSchemaType(name="hexBinary") public byte[] hexBytes; @XmlSchemaType(name="base64Binary") public byte[] base64Bytes; }
EclipseLink OXM
... <java-type name="example.BinaryData"> <xml-root-element/> <java-attributes> <xml-element java-attribute="hexBytes"> <xml-schema-type name="hexBinary"/> </xml-element> <xml-element java-attribute="base64Bytes"> <xml-schema-type name="base64Binary"/> </xml-element> </java-attributes> </java-type> ...
BinaryData b = new BinaryData(); b.hexBytes = new byte[] {2,4,8,16,32,64}; b.base64Bytes = b.hexBytes; jaxbContext.createMarshaller().marshal(b, System.out);
Output
<?xml version="1.0" encoding="UTF-8"?> <binaryData> <hexBytes>020308102040</hexBytes> <base64Bytes>AgMIECBA</base64Bytes> </binaryData>
byte[] versus Byte[]
Unlike other Java primitive/wrapper types, Eclipselink differentiates between byte[] (primitive) and Byte[] (wrapper) data types. By default, byte[] will marshal to an element or attribute of type base64Binary, whereas Byte[] will marshal each byte as its own element, as illustrated by the following example:
package example; import javax.xml.bind.annotation.*; @XmlRootElement public class BinaryData { public byte[] primitiveBytes; public Byte[] byteObjects; }
BinaryData b = new BinaryData(); b.primitiveBytes = new byte[] {34,45,56,67,78,89,89,34,23,12,12,11,2}; b.byteObjects = new Byte[] {23,1,112,12,1,64,1,14,3,2}; jaxbContext.createMarshaller().marshal(b, System.out);
Output
<?xml version="1.0" encoding="UTF-8"?> <binaryData> <primitiveBytes>Ii04Q05ZWSIXDAwLAg==</primitiveBytes> <byteObjects>23</byteObjects> <byteObjects>1</byteObjects> <byteObjects>112</byteObjects> <byteObjects>12</byteObjects> <byteObjects>1</byteObjects> <byteObjects>64</byteObjects> <byteObjects>1</byteObjects> <byteObjects>14</byteObjects> <byteObjects>3</byteObjects> <byteObjects>2</byteObjects> </binaryData>
Working with SOAP Attachments
If you are using EclipseLink MOXy in a Web Services environment, certain types of binary data may be created as an MTOM/XOP Attachment, instead of written directly into an XML element or attribute. This is done as an optimization for large amounts of binary data.
The following table shows the Java types that are automatically treated as Attachments, along with their corresponding MIME type:
MIME Type | Java Type |
---|---|
image/gif | java.awt.Image |
image/jpeg | java.awt.Image |
text/xml application/xml |
javax.xml.transform.Source |
*/* | javax.activation.DataHandler |
Java Architecture for XML Binding (JAXB) 2.2 Specification
Example
The following Java class contains two binary fields: a simple byte[], and a java.awt.Image. In a Web Services environment, the Image data will automatically be created as an attachment.
package example; import java.awt.Image; import javax.xml.bind.annotation.*; @XmlRootElement public class BinaryData { public byte[] bytes; public Image photo; }
Marshalling this object in a Web Services environment would look something like this (the actual appearance will depend on your application server's implementation of AttachmentMarshaller):
<?xml version="1.0" encoding="UTF-8"?> <binaryData> <bytes>Ii04Q05ZWSIXDAwLAg==</bytes> <photo> <xop:Include href="cid:1" xmlns:xop="http://www.w3.org/2004/08/xop/include"/> </photo> </binaryData>