XML JSON Data Format (camel-xmljson)
Available as of Camel 2.10
Camel already supports a number of data formats to perform XML and JSON-related conversions, but all of them require a POJO either as an input (for marshalling) or produce a POJO as output (for unmarshalling). This data format provides the capability to convert from XML to JSON and viceversa directly, without stepping through intermediate POJOs.
This data format leverages the Json-lib library to achieve direct conversion. In this context, XML is considered the high-level format, while JSON is the low-level format. Hence, the marshal/unmarshal semantics are assigned as follows:
- marshalling => converting from XML to JSON
- unmarshalling => converting from JSON to XML.
Options
This data format supports the following options. You can set them via all DSLs. The defaults marked with (*) are determined by json-lib, rather than the code of the data format itself. They are reflected here for convenience so that you don't have to dot back and forth with the json-lib docs.
Name |
Type |
Default |
Description |
---|---|---|---|
|
|
UTF-8 (*) |
Used when unmarshalling (JSON to XML conversion). Sets the encoding for the call to |
|
|
'e' (*) |
Used when unmarshalling (JSON to XML conversion). Specifies the name of the XML elements representing each array element. See json-lib doc. |
|
|
'a' (*) |
Used when unmarshalling (JSON to XML conversion). Specifies the name of the top-level XML element. |
|
|
none (*) |
Used when unmarshalling (JSON to XML conversion). When converting any JSON construct (object, array, null) to XML (unmarshalling), it specifies the name of the top-level element. |
|
|
false (*) |
Used when unmarshalling (JSON to XML conversion). According to the json-lib docs: "Flag to be tolerant to incomplete namespace prefixes." In most cases, json-lib automatically changes this flag at runtime to match the processing. |
|
|
none |
Used when unmarshalling (JSON to XML conversion). Binds namespace prefixes and URIs to specific JSON elements. |
|
|
none |
Used when unmarshalling (JSON to XML conversion). With expandable properties, JSON array elements are converted to XML as a sequence of repetitive XML elements with the local name equal to the JSON key, for example: { number: 1,2,3 }, normally converted to: |
|
|
YES |
Used when unmarshalling (JSON to XML conversion). Adds type hints to the resulting XML to aid conversion back to JSON. See documentation here for an explanation.
|
|
|
false (*) |
Used when marshalling (XML to JSON conversion). Determines whether the resulting JSON will start off with a top-most element whose name matches the XML root element. If disabled, XML string |
|
|
false (*) |
Used when marshalling (XML to JSON conversion). Determines whether white spaces between XML elements will be regarded as text values or disregarded. |
|
|
false (*) |
Used when marshalling (XML to JSON conversion). Determines whether leading and trailing white spaces will be omitted from String values. |
|
|
false (*) |
Used when marshalling (XML to JSON conversion). Signals whether namespaces should be ignored. By default they will be added to the JSON output using @xmlns elements. |
|
|
false (*) |
Used when marshalling (XML to JSON conversion). Removes the namespace prefixes from XML qualified elements, so that the resulting JSON string does not contain them. |
Basic Usage with Java DSL
Explicitly instantiating the data format
Just instantiate the XmlJsonDataFormat from package org.apache.camel.dataformat.xmljson. Make sure you have installed the camel-xmljson
feature (if running on OSGi) or that you've included camel-xmljson-{version}.jar and its transitive dependencies in your classpath. Example initialization with a default configuration:
XmlJsonDataFormat xmlJsonFormat = new XmlJsonDataFormat();
To tune the behaviour of the data format as per the options above, use the appropriate setters:
XmlJsonDataFormat xmlJsonFormat = new XmlJsonDataFormat(); xmlJsonFormat.setEncoding("UTF-8"); xmlJsonFormat.setForceTopLevelObject(true); xmlJsonFormat.setTrimSpaces(true); xmlJsonFormat.setRootName("newRoot"); xmlJsonFormat.setSkipNamespaces(true); xmlJsonFormat.setRemoveNamespacePrefixes(true); xmlJsonFormat.setExpandableProperties(Arrays.asList("d", "e"));
Once you've instantiated the data format, the next step is to actually use the it from within the marshal()
and unmarshal()
DSL elements:
// from XML to JSON from("direct:marshal").marshal(xmlJsonFormat).to("mock:json"); // from JSON to XML from("direct:unmarshal").unmarshal(xmlJsonFormat).to("mock:xml");
Defining the data format in-line
Alternatively, you can define the data format inline by using the xmljson()
DSL element.
// from XML to JSON - inline dataformat from("direct:marshalInline").marshal().xmljson().to("mock:jsonInline"); // from JSON to XML - inline dataformat from("direct:unmarshalInline").unmarshal().xmljson().to("mock:xmlInline");
If you wish, you can even pass in a Map<String, String> to the inline methods to provide custom options:
Map<String, String> xmlJsonOptions = new HashMap<String, String>(); xmlJsonOptions.put(org.apache.camel.model.dataformat.XmlJsonDataFormat.ENCODING, "UTF-8"); xmlJsonOptions.put(org.apache.camel.model.dataformat.XmlJsonDataFormat.ROOT_NAME, "newRoot"); xmlJsonOptions.put(org.apache.camel.model.dataformat.XmlJsonDataFormat.SKIP_NAMESPACES, "true"); xmlJsonOptions.put(org.apache.camel.model.dataformat.XmlJsonDataFormat.REMOVE_NAMESPACE_PREFIXES, "true"); xmlJsonOptions.put(org.apache.camel.model.dataformat.XmlJsonDataFormat.EXPANDABLE_PROPERTIES, "d e"); // from XML to JSON - inline dataformat w/ options from("direct:marshalInlineOptions").marshal().xmljson(xmlJsonOptions).to("mock:jsonInlineOptions"); // form JSON to XML - inline dataformat w/ options from("direct:unmarshalInlineOptions").unmarshal().xmljson(xmlJsonOptions).to("mock:xmlInlineOptions");
Basic usage with Spring or Blueprint DSL
Within the <dataFormats>
block, simply configure an xmljson
element with unique IDs:
<dataFormats> <xmljson id="xmljson"/> <xmljson id="xmljsonWithOptions" forceTopLevelObject="true" trimSpaces="true" rootName="newRoot" skipNamespaces="true" removeNamespacePrefixes="true" expandableProperties="d e"/> </dataFormats>
Then you simply refer to the data format object within your <marshal />
and {<unmarshal />}} DSLs:
<route> <from uri="direct:marshal"/> <marshal ref="xmljson"/> <to uri="mock:json" /> </route> <route> <from uri="direct:unmarshalWithOptions"/> <unmarshal ref="xmljsonWithOptions"/> <to uri="mock:xmlWithOptions"/> </route>
Enabling XML DSL autocompletion for this component is easy: just refer to the appropriate Schema locations, depending on whether you're using Spring or Blueprint DSL. Remember that this data format is available from Camel 2.10 onwards, so only schemas from that version onwards will include these new XML elements and attributes.
The syntax with Blueprint is identical to that of the Spring DSL. Just ensure the correct namespaces and schemaLocations are in use.
Namespace mappings
XML has namespaces to fully qualify elements and attributes; JSON doesn't. You need to take this into account when performing XML-JSON conversions.
To bridge the gap, Json-lib has an option to bind namespace declarations in the form of prefixes and namespace URIs to XML output elements while unmarshalling (i.e. converting from JSON to XML). For example, provided the following JSON string:
{ 'pref1:a': 'value1', 'pref2:b': 'value2 }
you can ask Json-lib to output namespace declarations on elements "pref1:a" and "pref2:b" to bind the prefixes "pref1" and "pref2" to specific namespace URIs.
To use this feature, simply create XmlJsonDataFormat.NamespacesPerElementMapping
objects and add them to the namespaceMappings
option (which is a List
).
The XmlJsonDataFormat.NamespacesPerElementMapping
holds an element name and a Map of [prefix => namespace URI]. To facilitate mapping multiple prefixes and namespace URIs, the NamespacesPerElementMapping(String element, String pipeSeparatedMappings)
constructor takes a String-based pipe-separated sequence of [prefix, namespaceURI] pairs in the following way: |ns2|http://camel.apache.org/personalData|ns3|http://camel.apache.org/personalData2|
.
In order to define a default namespace, just leave the corresponding key field empty: |ns1|http://camel.apache.org/test1||http://camel.apache.org/default|
.
Binding namespace declarations to an element name = empty string will attach those namespaces to the root element.
The full code would look like that:
XmlJsonDataFormat namespacesFormat = new XmlJsonDataFormat(); List<XmlJsonDataFormat.NamespacesPerElementMapping> namespaces = new ArrayList<XmlJsonDataFormat.NamespacesPerElementMapping>(); namespaces.add(new XmlJsonDataFormat. NamespacesPerElementMapping("", "|ns1|http://camel.apache.org/test1||http://camel.apache.org/default|")); namespaces.add(new XmlJsonDataFormat. NamespacesPerElementMapping("surname", "|ns2|http://camel.apache.org/personalData|" + "ns3|http://camel.apache.org/personalData2|")); namespacesFormat.setNamespaceMappings(namespaces); namespacesFormat.setRootElement("person");
And you can achieve the same in Spring DSL.
Example
Using the namespace bindings in the Java snippet above on the following JSON string:
{ "name": "Raul", "surname": "Kripalani", "f": true, "g": null}
Would yield the following XML:
<person xmlns="http://camel.apache.org/default" xmlns:ns1="http://camel.apache.org/test1"> <f>true</f> <g null="true"/> <name>Raul</name> <surname xmlns:ns2="http://camel.apache.org/personalData" xmlns:ns3="http://camel.apache.org/personalData2">Kripalani</surname> </person>
Remember that the JSON spec defines a JSON object as follows:
An object is an unordered set of name/value pairs. [...].
That's why the elements are in a different order in the output XML.
Dependencies
To use the XmlJson dataformat in your camel routes you need to add the following dependency to your pom.
<dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-xmljson</artifactId> <version>x.x.x</version> <!-- Use the same version as camel-core, but remember that this component is only available from 2.10 onwards --> </dependency>