i have been used JDOM to perform xml data entry & updation in any XML file, but now i am trying to use JAXB instead of JDOM but getting some difficulties.
as i know marshalling & unmarshalling in jaxb but when it comes to entry a new data into a xml at specified location (node), i find difficulties. e.g. for new entry Japan where id = Asia
<file>
<parent>
<node id="Asia">
<name>India</name>
<name>China</name>
</node>
<node id="Europe">
<name>UK</name>
</node>
</parent>
</file>
is there anybody who has idea about it.
If I'm not mistaken JAXB and JDOM and completely different things. JAXB will serialize java objects into an XML format and vice versa. JDOM simply reads in the XML file and stores it in a DOM tree which can then be used to modify the xml itself.
Using JAXB in this way is like trying to at runtime add a new variable to a class. It cannot be done. (at least to my knowledge).
Related
It is easy to parse XML in which tags name are fixed. In XStream, we can simply use #XStreamAlias("tagname") annotation. But how to parse XML in which tag name is not fixed. Suppose I have following XML :
<result>
<result1>
<fixed1> ... </fixed1>
<fixed2> ... </fixed2>
</result1>
<result2>
<item>
<America>
<name> America </name>
<language> English </language>
</America>
</item>
<item>
<Spain>
<name> Spain </name>
<language> Spanish </language>
</Spain>
</item>
</result2>
</result>
Tag names America and Spain are not fixed and sometimes I may get other tag names like Germany, India, etc.
How to define pojo for tag result2 in such case? Is there a way to tell XStream to accept anything as alias name if tag name is not known before-hand?
if it is ok for you to get the tag from inside the tag itself (field 'name'), using Xpath, you can do:
//result2/*/name/text()
another option could be to use the whole element, like:
//result2/*
or also:
//result2/*/name()
Some technologies (specifically, data binding approaches) are optimized for handling XML whose structure is known at compile time. Others (like DOM and other DOM-like tree models - JDOM, XOM etc) are designed for handling XML whose structure is not known in advance. Use the tool for the job.
XSLT and XQuery try to blend both. In their schema-aware form, they can take advantage of static structure information when it is available. But more usually they are run in "untyped" mode, where there is no a-priori knowledge of element names or structure, and everything is handled as it comes. The XSLT rule-based processing paradigm is particularly well suited to "semi-structured" XML whose content is unpredictable or variable.
I am using XStream library for XML parsing. I was wondering if the library allows jumping to a particular node directly using the index.
So for e.g.
<details>
<personal>
<basicInfo>
<firstName>John</firstName>
<lastName>Doe</lastName>
<phoneNumber>9999999999</phoneNumber>
<dateOfBirth>1990-01-01</dateOfBirth>
</basicInfo>
<address>
<street>random St.</street>
<city>City</city>
<stateProv>BC</stateProv>
<country>CA</country>
<postCode>12345</postCode>
</address>
</personal>
<personal>
<basicInfo>
<firstName>John2</firstName>
<lastName>Doe2</lastName>
<phoneNumber>9999999999</phoneNumber>
<dateOfBirth>1990-01-01</dateOfBirth>
</basicInfo>
<address>
<street>random St.2</street>
<city>City2</city>
<stateProv>BC2</stateProv>
<country>CA2</country>
<postCode>12345</postCode>
</address>
</personal>
</details>
For the XML above I would like to skip the first <personal>...</personal>
and only process the second node. Can I call it using an index.
XStream is a simple library to serialize objects to XML and back again.
I am not sure what you mean by process in this context, but if your POJO for serialization is set up correctly to contain a List of "personal" nodes. I don't see why you couldn't deserialize the XML and remove the unwanted node after the fact.
As far as I know, vtd-xml is the only XML parsing routine that natively offers indexing feature, called vtd+XML.
I have an XML, for example
<root>
<config x="xxx" y="yyyy" z="zzz" />
<properties>blah blah blah </properties>
<example>
<name>...</name>
<decr>...</descr>
</example>
<example>
<name>...</name>
<decr>...</descr>
</example>
</root>
and I need to get nodes config, and properties and all values in it.
Thank you
Xpath can fetch you the data in the config tag. You need to create an expression first like this
expression="//root/config/#x", to get value of x,y,z.
For properties, follow this thread :
Parsing XML with XPath in Java
Hope this helps
DOM,DOM4J,SAX..
if the size of XML file is small,you can use DOM or DOM4J,but the size is big , you use the SAX
If you directly want to query or fetch data XPath can help, but if you want the data as Java Objects so that you can use it further then use JAXB
You can use SAX parser to read the xml manipulate its event based parsing and consumes more memory.
If your xml is big and requires lot of manipulations then go-for DOM/DOM4j either is good. DOM4L is very latest. DOM is widely used in industry.
Based on your requirement go for good parser.
Thanks,
Pavan
I have the following data in my XML file.
<main>
<Team Name="Development" ID="10">
<Emp Source="Business" Total="130" Active="123" New="12" />
<Emp Source="Business" Total="131" Active="124" New="13" />
</Team>
<Team Name="Testing" ID="10">
<Emp Source="Business" Total="133" Active="125" New="14" />
</Team>
</main>
I want to read above data & store values into arrays,Can any one help on these?
Not sure why you need to convert those xml into Arrays, anyhow you can read xml and parse it by several ways. Normally we use DOM or Stax Parser and a Tutorial link is here, also here is a Java SAX Parsing Example tutorial.
Hope this can help you to achieve your goal. Update your question again if you stuck anywhere.
You can use parser in JAVA to parse the XML document. The package in java for this purpose is javax.xml.parsers . DocumentBuilder parses XML into a Document and Document is a tree structured data structure that is DOM(Document Object Model) readable file. Its nodes can be traversed/ changed/ accessed by DOM methods.
Here is a very good tutorial on XML DOM: http://www.roseindia.net/xml/dom/
and more specifically: http://www.roseindia.net/xml/dom/accessing-xml-file-java.shtml
also you can always refer to w3school for more theory on DOM!
First off, let me say I am a new to SAX and Java.
I am trying to read information from an XML file that is not well formed.
When I try to use the SAX or DOM Parser I get the following error in response:
The markup in the document following the root element must be well-formed.
This is how I set up my XML file:
<format type="filename" t="13241">0;W650;004;AG-Erzgeb</format>
<format type="driver" t="123412">001;023</format>
...
Can I force the SAX or DOM to parse XML files even if they are not well formed XML?
Thank you for your help. Much appreciated.
Haythem
Your best bet is to make the XML well-formed, probably by pre-processing it a bit. In this case, you can achieve that simply by putting an XML declaration on (and even that's optional) and providing a root element (which is not optional), like this:
<?xml version="1.0"?>
<wrapper>
<format type="filename" t="13241">0;W650;004;AG-Erzgeb</format>
<format type="driver" t="123412">001;023</format>
</wrapper>
There I've arbitrarily picked the name "wrapper" for the root element; it can be whatever you like.
Hint: using sax or stax you can successfully parse a not well formed xml document until the FIRST "well formed-ness" error is encountered.
(I know that this is not of too much help...)
As the DOM will scan you xml file then build a tree, the root node of the tree is like the as 1 Answer. However, if the Parser can't find the or even , it can even build the tree. So, its better to do some pre-processing the xml file before parser it by DOM or Sax.