What is xml serialization in java

XML serialization in Java?

Back in the golden XML days, I worked some projects that used similar processes to generate Java code from XML definitions. Solution 2: XStream is pretty good at serializing object to XML without much configuration and money!

XML serialization in Java?

2008 Answer The «Official» Java API for this is now JAXB — Java API for XML Binding. See Tutorial by Oracle. The reference implementation lives at http://jaxb.java.net/

2018 Update Note that the Java EE and CORBA Modules are deprecated in SE in JDK9 and to be removed from SE in JDK11. Therefore, to use JAXB it will either need to be in your existing enterprise class environment bundled by your e.g. app server, or you will need to bring it in manually.

XStream is pretty good at serializing object to XML without much configuration and money! (it’s under BSD license).

We used it in one of our project to replace the plain old java-serialization and it worked almost out of the box.

«Simple XML Serialization» Project

You may want to look at the Simple XML Serialization project. It is the closest thing I’ve found to the System.Xml.Serialization in .Net.

Examples of XML Serialization, The following code examples address various advanced scenarios, including how to use XML serialization to generate an XML stream that conforms to a specific XML Schema (XSD) document. Serializing a DataSet. Besides serializing an instance of a public class, an instan…Serializing A DatasetBesides serializing an instance of a public class, an instance of a DataSetcan also be serialized, as shown in the following code example.Serializing An Xmlelement and XmlnodeYou can also serialize instances of an XmlElement or XmlNodeclass, as shown in the following code example.Serializing A Class That Contains A Field Returning A Complex ObjectIf a property or field returns a complex object (such as an array or a class instance), the XmlSerializerconverts it to a…Serializing An Array of ObjectsYou can also serialize a field that returns an array of objects, as shown in the following code …Serializing A Class That Implements The iCollection InterfaceYou can create your own collection classes by implementing the ICollection interface, and us…Purchase Order ExampleYou can cut and paste the following example code into a text file renamed with a .cs or .vb file name extension. Use the C# or Visual Basic compiler to com…See Also1. 2. 3. Code sample(object sender, XmlAttributeEventArgs e) Feedback

12.4 Serialization of Java Object in XML using

Saving the state of an object in a file is known as serialization . Rather than serializing Java objects to binary format we can serialize them to XML documen

How to add an XML namespace (xmlns) when serializing an object to XML

XStream doesn’t support namespaces but the StaxDriver it uses, does. You need to set the details of your namespace into a QNameMap and pass that into the StaxDriver :

QNameMap qmap = new QNameMap(); qmap.setDefaultNamespace("http://libvirt.org/schemas/domain/qemu/1.0"); qmap.setDefaultPrefix("qemu"); StaxDriver staxDriver = new StaxDriver(qmap); XStream xstream = new XStream(staxDriver); xstream.autodetectAnnotations(true); xstream.alias("domain", Domain.class); Domain d = new Domain("kvm","linux"); String xml = xstream.toXML(d); 

Alternatively, this use case could be handled quite easily with a JAXB implementation (Metro, EclipseLink MOXy, Apache JaxMe, etc):

package com.example; import javax.xml.bind.annotation.XmlAttribute; import javax.xml.bind.annotation.XmlRootElement; @XmlRootElement public class Domain < private String type; private String os; @XmlAttribute public String getType() < return type; >public void setType(String type) < this.type = type; >public String getOs() < return os; >public void setOs(String os) < this.os = os; >> 

package-info

@XmlSchema(xmlns=< @XmlNs( prefix="qemu", namespaceURI="http://libvirt.org/schemas/domain/qemu/1.0") >) package com.example; import javax.xml.bind.annotation.XmlNs; import javax.xml.bind.annotation.XmlSchema; 

package com.example; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; public class Demo < public static void main(String[] args) throws JAXBException < JAXBContext jc = JAXBContext.newInstance(Domain.class); Domain domain = new Domain(); domain.setType("kvm"); domain.setOs("linux"); Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(domain, System.out); >> 

For More Information

• http://bdoughan.blogspot.com/2010/08/jaxb-namespaces.html
• http://bdoughan.blogspot.com/2010/10/how-does-jaxb-compare-to-xstream.html

This is a bit of a hack, but it’s quick and easy: add a field to your class called xmlns , and only have it non-null during serialisation. To continue your example:

@XStreamAlias(value="domain") public class Domain < @XStreamAsAttribute private String type; private String os; (. ) @XStreamAsAttribute @XStreamAlias("xmlns:qemu") String xmlns; public void serialise(File path) < XStream xstream = new XStream(new DomDriver()); xstream.processAnnotations(Domain.class); (. ) PrintWriter out = new PrintWriter(new FileWriter(path.toFile())); xmlns = "http://libvirt.org/schemas/domain/qemu/1.0"; xstream.toXML(this, out); xmlns = null; >> 

To be complete, setting xmlns = null should be in a finally clause. Using a PrintWriter also allows you to insert an XML declaration at the start of the output, if you like.

XML serialization in Java?, 0. If you’re talking about automatic XML serialization of objects, check out Castor: Castor is an Open Source data binding framework for Java [tm]. It’s the shortest path between Java objects, XML documents and relational tables. Castor provides Java-to-XML binding, Java-to-SQL persistence, and more.

Converting an XML serialization back to java code

Provided that all serialized objects comply to the java beans contract, you can re-create the process that the XML de-serializer follows to unmarshal the java objects, in order to recreate the code that goes with it.

Back in the golden XML days, I worked some projects that used similar processes to generate Java code from XML definitions.

Departing from your serialized model, you can use a XSL-T transformation to recreate the code that lead to the serialized objects. This process will create very linear code (as in non-modular), but you’ll have what you’re looking for.

An example to get you started: To process the XML you provided, you can use the following recursive transformation: copy/paste it & try it here: online XSL-T (the template is based on Xpath 1.0 to be able to use the online tool. Xpath 2.0 will improve the code in some areas, like string functions)

Disclaimer: I tested the template on the sample provided and some variations of it, including some containign several more objects. I did not test deeper object nesting. It’s an example and not a fully-functional XML Serialization to Java transformation, which is left as an exercise to the reader 🙂

Yes, I think there are several ways to implement this. First of all you can use JAXB technology, read about it http://www.oracle.com/technetwork/articles/javase/index-140168.html#xmp1. Second way: you always can read xml in runtime (DOM, SAX) and create objects dynamically using reflection.

I don’t think this is possible because if object class can be everything, how would you know what method to call to set size x to 42? Maybe there is a setter for this, maybe just a constructor or the number was calculated somehow.

The only possibility I can imagine is through the use of reflection, that’s more or less the same frameworks like XStream do. So you can create the same object, but not the same code that was originally used to create it.

XMLEncoder in java for serialization, // It then loads from the XML file into a new ArrayList // // Keywords: ArrayList, Serialize, XMLEncode, XMLDecode // Note: Change the XML file while the 10 second Thread.sleep is waiting to see that // …

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What is XML serialization Java?

Serialization of Java Objects to XML can be done using XMLEncoder, XMLDecoder. Java Object Serialization feature was introduced in JDK 1.1. Serialization transforms a Java object or graph of Java object into an array of bytes which can be stored in a file or transmitted over a network. All this is done using java.

Which annotation is needed for serialization and deserialization of XML format in the model classes?

Jackson annotations are useful in defining and controlling the process of serialization and deserialization across various formats such as XML, JSON, and YAML.

Can ObjectMapper be used for XML?

Jackson is typically used by means of an ObjectMapper instance. In order to work with XML, we’ll instead use the XmlMapper class. This is a direct extension of ObjectMapper and can be used as a replacement, with the exact same API we’re already used to. ObjectMapper objectMapper = new XmlMapper(module);

What is Jackson XML?

The Jackson XML module supports the full range of annotations that Jackson provides for annotating our POJOs. This means that we can have one single set of beans, with one set of annotations and, depending on the ObjectMapper instance, we select whether we get XML or JSON.

What is Jackson Dataformat XML?

Package that contains XML-based backends which can serialize POJOs to and deserialize from XML, using Stax XML parsers and generators for XML processing and mostly standard Jackson data binding otherwise. …

Which class should be used to serialize an object in XML format?

Xml. Serialization namespace) class is used to serialize and deserialize. The class method Serialize is called. Since we have to serialize in a file, we create a ” TextWriter “.

Is Jackson Xmlmapper thread safe?

They are fully immutable, thread-safe, meaning that it is not even theoretically possible to cause thread-safety issues (which can occur with ObjectMapper if code tries to re-configure instance).

Can GSON parse XML?

GsonXml. GsonXml is a small library that allows using [Google Gson library] (https://code.google.com/p/google-gson/) for XML deserialization. The main idea is to convert a stream of XML pull parser events to a stream of JSON tokens. It’s implemented by passing a custom JsonReader (that wraps XmlPullParsers ) to Gson .

Are methods serialized in Java?

Since Method does not implement Serializable, it cannot be serialized using the standard Java Serialization API. A workaround would be to manually serialize just the name of the class and method and its parameter types. You can then recreate the Method instance during deserialization.

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