This section contains the following tasks for converting objects to and from JSON documents.
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Task 1: Marshalling and Unmarshalling JSON Documents
Use the eclipselink.media-type property on your JAXB Marshaller or Unmarshaller to produce and use JSON documents with your application, as shown in Example 16-1.
You can also specify the
eclipselink.media-type property in the Map of the properties used when you create the JAXBContext , as shown in Example 16-2.
Example 16-2 Using a Map
When specified in a Map, the Marshallers and Unmarshallers created from the
JAXBContent will automatically use the specified media type.
You can also configure your application to use JSON documents by using the
MarshallerProperties , UnmarshallerProperties , and MediaType constants, as shown in Example 16-3.
Example 16-3 Using MarshallerProperties and UnarshallerProperties
Aggiungere Alldebrid Su Jer 24Task 2: Specifying JSON Bindings
Example 16-4 shows a basic JSON binding that does not require compile time dependencies in addition to those required for normal JAXB usage. This example shows how to unmarshal JSON from a
StreamSource into the user object SearchResults , add a new Result to the collection, and then marshal the new collection to System.out .
You can also write MOXy External Bindings files as JSON documents. Example 16-5 shows how to use
bindings.json to map Customer and PhoneNumber classes to JSON.
Example 16-5 Using External Bindings
Example 16-6 shows how to use the JSON file (created in Example 16-5) when bootstrapping a
JAXBContext .
Example 16-6 Using JSON to Bootstrap a JAXBContext
Task 3: Specifying JSON Data Types
Although XML has a single data type, JSON differentiates between strings, numbers, and booleans. EclipseLink supports these data types automatically, as shown in Example 16-7
Task 4: Supporting Attributes
JSON does not use attributes; anything mapped with a
@XmlAttribute annotation will be marshalled as an element. By default, EclipseLink triggers both the attribute and element events, thereby allowing either the mapped attribute or element to handle the value.
You can override this behavior by using the
JSON_ATTRIBUTE_PREFIX property to specify an attribute prefix, as shown in Example 16-8. EclipseLink prepends the prefix to the attribute name during marshal and will recognize it during unmarshal.
In the example below the
number field is mapped as an attribute with the prefix @. Bayonetta xbox 360 game save ers.
You can also set the
JSON_ATTRIBUTE_PREFIX property in the Map used when creating the JAXBContext , as shown in Example 16-9. All marshallers and unmarshallers created from the context will use the specified prefix.
Example 16-9 Setting a Prefix in a Map
Task 5: Supporting no Root Element
EclipseLink supports JSON documents without a root element. By default, if no
@XmlRootElement annotation exists, the marshalled JSON document will not have a root element. You can override this behavior (that is omit the root element from the JSON output, even if the @XmlRootElement is specified) by setting the JSON_INCLUDE_ROOT property when marshalling a document, as shown in Example 16-10.
Example 16-10 Marshalling no Root Element Documents
When unmarshalling a document with no root elements, you should specify the class to which to unmarshal, as shown in Example 16-11.
All versions of microsoft windows. Example 16-11 Unmarshalling no Root Element Documents
Task 5 Using Namespaces
Because JSON does not use namespaces, by default all namespaces and prefixes are ignored when marshalling and unmarshalling. In some cases, this may be an issue if you have multiple mappings with the same local name – there will be no way to distinguish between the mappings.
With EclipseLink, you can supply a Map of namespace-to-prefix (or an instance of
NamespacePrefixMapper ) to the Marshaller and Unmarshaller. The namespace prefix will appear in the marshalled document prepended to the element name. EclipseLink will recognize the prefix during an unmarshal operation and the resulting Java objects will be placed in the proper namespaces.
Example 16-12 shows how to use the
NAMESPACE_PREFIX_MAPPER property.
The
MarshallerProperties.NAMESPACE_PREFIX_MAPPER applies to both XML and JSON; UnmarshallerProperties.JSON_NAMESPACE_PREFIX_MAPPER is a JSON-only property. XML unmarshalling can obtain the namespace information directly from the document.
When JSON is marshalled, the namespaces will be given the prefix from the Map separated by a dot ( . ):
The dot separator can be set to any custom character by using the
JSON_NAMESPACE_SEPARATOR property. Here, a colon ( : ) will be used instead:
Task 6: Using Collections
By default, when marshalling to JSON, EclipseLink marshals empty collections as
[ ] , as shown in Example 16-13.
Use the
JSON_MARSHAL_EMPTY_COLLECTIONS property to override this behavior (so that empty collections are not marshalled at all).
Task 7: Mapping Root-Level Collections
If you use the
@XmlRootElement(name='root') annotation to specify a root level, the JSON document can be marshalled as:
Because the root element is present in the document, you can unmarsal it using:
If the class does not have an
@XmlRootElement (or if JSON_INCLUDE_ROOT = false), the marshal would produce:
Software for mac free. Manual multimetro steren mul-600. Because the root element is not present, you must indicate the class to unmarshal to:
Task 8: Wrapping Text Values
JAXB supports one or more
@XmlAttributes on @XmlValue classes , as shown in Example 16-14.
To produce a valid JSON document, EclipseLink uses a
value wrapper, as shown in Example 16-15.
Example 16-15 Using a value Wrapper
By default, EclipseLink uses value as the name of the wrapper. Use the
JSON_VALUE_WRAPPER property to customize the name of the value wrapper, as shown in Example 16-16.
Example 16-16 Customizing the Name of the Value Wrapper
Would produce:
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You can also specify the
JSON_VALUE_WRAPPER property in the Map of the properties used when you create the JAXBContext , as shown in Example 16-17.
When specified in a Map, the Marshallers and Unmarshallers created from the
JAXBContent will automatically use the specified value wrapper.
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