How to convert XML to Java Object

Hello:
I would like to convert an XML doucment into an object, but I having alot of trouble doing this.
here is the document:
<?xml version="1.0" encoding="UTF-8"?>
<Marketing_Programs>
<Marketing_Program>
<rateCode type="String">A</rateCode>
<plan type="String">AAA/CAA</plan>
<flatRate type="double">0.0</flatRate>
<discountRate type="double">10.0</discountRate>
</Marketing_Program>
<Marketing_Program>
<rateCode type="String">B</rateCode>
<plan type="String">Business Rate</plan>
<flatRate type="double">0.0</flatRate>
<discountRate type="double">5.0</discountRate>
</Marketing_Program>
</Marketing_Programs>
A Marketing_Program class exists and so I want to create multiple Marketing_Program objects and store it in hashmap. I'm pretty much stuck on XML to object conversion due to lack of knowledge on converting string to the appropriate datatype.
Any help would be greatly appreciated!
Thanks in advance!
Peter

using jaxb, castor, jox...
[email protected]

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How to parse XML to Java object... please help really stuck

Thank you for reading this email...
If I have a **DTD** like:
<!ELEMENT person (name, age)>
<!ATTLIST person
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>
<!ELEMENT name ((family, given) | (given, family))>
<!ELEMENT age (#PCDATA)>
<!ELEMENT family (#PCDATA)>
<!ELEMENT given (#PCDATA)>
the **XML** like:
<person id="a1">
<name>
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     <given> Samurai </given>
</name>
<age> 21 </age>
</person>
**** Could you help me to write a simple parser to parse my DTD and XML to Java object, and how can I use those objects... sorry if the problem is too basic, I am a beginner and very stuck... I am very confuse with SAXParserFactory, SAXParser, ParserAdapter and DOM has its own Factory and Parser, so confuse...
Thank you for your help, Yo

Hi, Yo,
Thank you very much for your help. And I Wish you are there...I'm. And I plan to stay - It's sunny and warm here in Honolulu and the waves are up :)
A bit more question for dear people:
In the notes, it's mainly focus on JAXB,
1. Is that mean JAXB is most popular parser for
parsing XML into Java object? With me, definitely. There are essentially 3 technologies that allow you to parse XML documents:
1) "Callbacks" (e.g. SAX in JAXP): You write a class that overrides 3 methods that will be called i) whenever the parser encounters a start tag, ii) an end tag, or iii) PCDATA. Drawback: You have to figure out where the heck in the document hierarchy you are when such a callback happens, because the same method is called on EACH start tag and similarly for the end tag and the PCDATA. You have to create the objects and put them into your own data structure - it's very tedious, but you have complete control. (Well, more or less.)
2) "Tree" (e.g. DOM in JAXP, or it's better cousin JDOM): You call a parser that in one swoop creates an entire hierarchy that corresponds to the XML document. You don't get called on each tag as with SAX, you just get the root of the resulting tree. Drawback: All the nodes in the tree have the same type! You probably want to know which tags are in the document, don't you? Well, you'll have to traverse the tree and ask each node: What tag do you represent? And what are your attributes? (You get only strings in response even though your attributes often represent numbers.) Unless you want to display the tree - that's a nice application, you can do it as a tree model for JTree -, or otherwise don't care about the individual tags, DOM is not of much help, because you have to keep track where in the tree you are while you traverse it.
3) Enter JAXB (or Castor, or ...): You give it a grammar of the XML documents you want to parse, or "unmarshall" as the fashion dictates to call it. (Actually the name isn't that bad, because "parsing" focuses on the input text while "unmarshalling" focuses on the objects you get, even though I'd reason that it should be marshalling that converts into objects and unmarshalling that converts objects to something else, and not vice versa but that's just my opinion.) The JAXB compiler creates a bunch of source files each with one (or now more) class(es) (and now interfaces) that correspond to the elements/tags of your grammar. (Now "compiler" is a true jevel of a misnomer, try to explain to students that after they run the "compiler", they still need to compile the sources the "compiler" generated with the real Java compiler!). Ok, you've got these sources compiled. Now you call one single method, unmarshall() and as a result you get the root node of the hierarchy that corresponds to the XML document. Sounds like DOM, but it's much better - the objects in the resulting tree don't have all the same type, but their type depends on the tag they represent. E.g if there is the tag <ball-game> then there will be an object of type myPackage.BallGame in your data structure. It gets better, if there is <score> inside <ball-game> and you have an object ballGame (of type BallGame) that you can simply call ballGame.getScore() and you get an object of type myPackage.Score. In other words, the child tags become properties of the parent object. Even better, the attributes become properties, too, so as far as your program is concerned there is no difference whether the property value was originally a tag or an attribute. On top of that, you can tell in your schema that the property has an int value - or another primitive type (that's like that in 1.0, in the early release you'll have to do it in the additional xjs file). So this is a very natural way to explore the data structure of the XML document. Of course there are drawbacks, but they are minor: daunting complexity and, as a consequence, very steep learning curve, documentation that leaves much to reader's phantasy - read trial and error - (the user's guide is too simplicistic and the examples too primitive, e.g. they don't even tell you how to make a schema where a tag has only attributes) and reference manual that has ~200 pages full of technicalities and you have to look with magnifying glas for the really usefull stuff, huge number of generated classes, some of which you may not need at all (and in 1.0 the number has doubled because each class has an accompanying interface), etc., etc. But overall, all that pales compared to the drastically improved efficiency of the programmer's efforts, i.e. your time. The time you'll spend learning the intricacies is well spent, you'll learn it once and then it will shorten your programming time all the time you use it. It's like C and Java, Java is order of magnitude more complex, but you'd probably never be sorry you gave up C.
Of course the above essay leaves out lots and lots of detail, but I think that it touches the most important points.
A word about JAXB 1.0 vs. Early Release (EA) version. If you have time, definitively learn 1.0, they are quite different and the main advantage is that the schema combines all the info that you had to formulate in the DTD and in the xjs file when using the EA version. I suggested EA was because you had a DTD already, but in retrospect, you better start from scratch with 1.0. The concepts in 1.0 are here to stay and once your surmounted the learning curve, you'll be glad that you don't have to switch concepts.
When parser job is done,
what kind of Java Object we will get? (String,
InputStream or ...)See above, typically it's an object whose type is defined as a class (and interface in 1.0) within the sources that JABX generates. Or it can be a String or one of the primitive types - you tell the "compiler" in the schema (xjs file in EA) what you want!
2. If we want to use JAXB, we have to contain a
XJS-file? Something like:In EA, yes. In 1.0 no - it's all in the schema.
I am very new to XML, is there any simpler way to get
around them? It has already take me 4 days to find a
simple parser which give it XML and DTD, then return
to me Java objects ... I mean if that kind of parser
exists....It'll take you probably magnitude longer that that to get really familiar with JAXB, but believe me it's worth it. You'll save countless days if not weeks once you'll start developing serious software with it. How long did it take you to learn Java and it's main APIs? You'll either invest the time learning how to use the software others have written, or you invest it writing it yourself. I'll take the former any time. But it's only my opinion...
Jan

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I have a schema "FreeStyle.xsd" i used JAXB to generate POJO's . I get around 15 classes. I have a config.xml which is compliant to this schema . Now i want to write a java program which takes the config.xml and converts it into a java object . Please anybody help me with this . Thanks in advance
Freestyle.xsd
<?xml version="1.0" encoding="windows-1252"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="FreeStyleProject" type="hudson.model.FreeStyleProject"/>
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<xsd:complexType name="hudson.model.HealthReport">
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Config.xml
<?xml version='1.0' encoding='UTF-8'?>
<project>
<actions/>
<description>Sample job ..</description>
<project-properties class="java.util.concurrent.ConcurrentHashMap">
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    <entry>
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    <entry>
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        <originalValue class="hudson.scm.NullSCM"/>
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</project-properties>
<keepDependencies>false</keepDependencies>
<creationTime>1402648240275</creationTime>
<properties/>
<cascadingChildrenNames class="java.util.concurrent.CopyOnWriteArraySet"/>
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<blockBuildWhenDownstreamBuilding>false</blockBuildWhenDownstreamBuilding>
<blockBuildWhenUpstreamBuilding>false</blockBuildWhenUpstreamBuilding>
<concurrentBuild>false</concurrentBuild>
<cleanWorkspaceRequired>false</cleanWorkspaceRequired>
</project>
the file generated by JAXB are
com\model\HudsonModelAbstractItem.java
com\model\HudsonModelAbstractProject.java
com\model\HudsonModelActionable.java
com\model\HudsonModelBallColor.java
com\model\HudsonModelBaseBuildableProject.java
com\model\HudsonModelFreeStyleProject.java
com\model\HudsonModelHealthReport.java
com\model\HudsonModelJob.java
com\model\HudsonModelJobProperty.java
com\model\HudsonModelProject.java
com\model\HudsonModelQueueItem.java
com\model\HudsonModelRun.java
com\model\HudsonModelRunArtifact.java
com\model\HudsonScmRepositoryBrowser.java
com\model\HudsonScmSCM.java
com\model\ObjectFactory.java
Any help will be appreciated .
Thanks in advance

Unmarshal the config.xml to Java object.
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Message was edited by:
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but over on the right one of the links will let you browse individual files, which should
get you pretty quickly to the XML parser in this demo.
By the way, if you have a choice between JSON and XML in this environment, I'd
personally go with JSON. It's simpler to parse and faster - indeed, see
com.hdcookbook.grin.util.JsonIO in the cookbook repository. Of course, if you're
interacting with a server under your control and you want maximum performance, you
can use a more efficient binary format, too.
Cheers,
Bill

XML to java object AND Performance

Hi,
I read some article about marshalling a XML file to Java Object (like Castor, XML Beans projects...)
To resume: I would like to marshal a XML doc (from XML to Java object. Later I would like to put these objects on a SGBD...). Unfortenaly I suppose that approach is to expensive on term of performance? Supposing that my xml doc contain 100 data's occurances, XML bean woulkd create 100 objects corresponding. My problem is that I don't want that the all 100 objects live in the same time on memory. For example, my code will read sequential, the xml occurances (like a Sax parser), create 10 datas objects (standby), put these in the data base, and destroy these objects before...iteratively create the next 10 objects...
It is possible ? Can anybody help me?
Thank

On the article: Java Architecture for XML Binding (JAXB)
(http://java.sun.com/developer/technicalArticles/WebServices/jaxb/)
I found maybe a response?
"...in other words, you can do a SAX parse of a document and then pass the events to JAXB for unmarshalling. "
But somebody could help me to write the code to do that?

Design pattern for converting multiple complex Java objects to XML

What is the traditionally accepted high performance mechanism for converting Java objects to XML? Some options I have explored are:
1. SAX-JAXP
2. DOM-JAXP
3. JAXB
4. Castor
Which of these usually performs the best for large, complex objects which contain multiple subobjects?
Thanks.

Take a look at XStream. It will simplify your life considerably.
Typical code snipped
XStream xStream = new XStream();
xStream.toXML(someJavaObject);That's it. Regarding the others...
1. SAX-JAXP
Can be used for XML -> Java Objects, but you have to write significant amounts of ugly, high maintainenance code
2. DOM-JAXP
Slower and more memory intensive than SAX because you need to read the whole object into memory first. Just as ugly and high maintenance.
3. JAXB
Actually very good for going from a POJO to XML, but rubbish in the opposite direction. The worst part is it adds an extra step to your build process as you need to tell it to generate and compile the source for doing this.
4. Castor
Not used it since JAXB came out. Works pretty much in the same way but also supports XML -> POJOs.

How to convert xml file to xsl using java

Hi all,
I have an XML file with which i need to convert(transform) it to an xsl file using java.
I am new to converting xml file to xslt.Please send me if u have code .
Thanks in advance
regards
Ram

You seem to be asking the wrong question. An XSL file can be used to transform an XML file, but transforming an XML into an XSL does not make sense. The API for running XSL transforms on the Java platform is described here:
http://java.sun.com/javase/6/docs/api/javax/xml/transform/package-summary.html

How to convert XML to Java Object

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