When flare reads an XML file in the external graphml format, it involves using doc4j.

To use dom4j to read and write XML documents, you need to first download the dom4j package, dom4j official website in http://www.dom4j.org/

 

The latest dom4j package:

Http://nchc.dl.sourceforge.net/sourceforge/dom4j/dom4j-1.6.1.zip

 

There are two packages after the unzipping. If you only operate the XML file, run dom4j- 1.6.1 . Jar can be added to the project, if you need to use XPath, you also need to add the package jaxen-1.1-beta-7.jar. bitscn_com

 

The following are related operations: bitscn_com

 

1. Document Object-related network management network bitscn.com

 

1. Read the XML file and obtain the document object.

 

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Saxreader reader = new saxreader ();

Document document = reader. Read (new file ("input. xml "));

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2. parse the text in XML format to obtain the document object. Bitscn_com

 

String text = "<members> </members> ";

Document document = incluenthelper. parsetext (text );

 

 

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3. Create a Document Object.

 

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Document document = incluenthelper. createdocument ();

Element root = Document. addelement ("members"); // create a root node

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Ii. node Problems

 

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1. Get the root node of the document.

 

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Element rootelm = Document. getrootelement ();

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2. Obtain a single subnode of a node.

 

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Element memberelm = root. element ("member"); // "member" is the node name.

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3. Get the node text: China Network Management Alliance WWW, bitscn, com

 

String text = memberelm. gettext (); can also be used:

String text = root. elementtext ("name"); this is the text that retrieves the name byte points under the root node.

 

 

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4. retrieve all the byte points named "member" under a node and traverse www.bitscn.com

 

List nodes = rootelm. Elements ("member ");

 

For (iterator it = nodes. iterator (); it. hasnext ();){

Element elm = (element) it. Next ();

// Do something

}

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5. traverse all subnodes under a node. Www.bitscn.com

 

For (iterator it = root. elementiterator (); it. hasnext ();){

Element element = (element) it. Next ();

// Do something

}

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6. Add a subnode under a node.

 

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Element ageelm = newmemberelm. addelement ("Age ");

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7. Set the node text. Network Management Network bitscn.com

 

Ageelm. settext ("29 ");

 

 

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8. delete a node.

 

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Parentelm. Remove (childelm); // childelm is the node to be deleted, and parentelm is the parent node.

 

3. Attribute-related.

 

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1. Obtain an attribute under a node

Element root = Document. getrootelement ();

Attribute attribute = root. Attribute ("size"); // attribute name

 

 

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2. Get the attribute text

 

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String text = attribute. gettext (); can also be used:

String text2 = root. element ("name"). attributevalue ("firstname"); this is the value of the firstname attribute of the name byte point under the root node.

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3. traverse all attributes of a node

 

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Element root = Document. getrootelement ();

For (iterator it = root. attributeiterator (); it. hasnext ();){

Attribute attribute = (attribute) it. Next ();

String text = attribute. gettext ();

System. Out. println (text );

}

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4. Set the attributes and text of a node.

 

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Newmemberelm. addattrielm ("name", "sitinspring ");

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5. Set the attribute text

 

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Attribute attribute = root. Attribute ("name ");

Attribute. settext ("sitinspring ");

 

 

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6. delete a property China Network Management Forum bbs.bitscn.com

 

Attribute attribute = root. Attribute ("size"); // attribute name

Root. Remove (attribute );

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4. Write documents into XML files. China Network Management Forum bbs.bitscn.com

 

1. The document is in full English and is written directly without encoding. Network Management Alliance www.bitscn.com

 

Xmlwriter writer = new xmlwriter (New filewriter ("output. xml "));

Writer. Write (document );

Writer. Close ();

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2. The document contains Chinese characters and sets the encoding format for writing.

 

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Outputformat format = outputformat. createprettyprint ();

Format. setencoding ("GBK"); // specify the XML Encoding

Xmlwriter writer = new xmlwriter (New filewriter ("output. xml"), format );

Writer. Write (document );

Writer. Close ();

5. Conversion of strings and XML

 

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1. Convert the string to bitscn.com

 

String text = "<members> <member> sitinspring </member> </members> ";

Document document = incluenthelper. parsetext (text );

 

 

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2. Convert the XML of the document or node into a string. China Network Management Alliance WWW, bitscn, com

 

Saxreader reader = new saxreader ();

Document document = reader. Read (new file ("input. xml "));

Element root = Document. getrootelement ();

String docxmltext = Document. asxml ();

String rootxmltext = root. asxml ();

Element memberelm = root. element ("member ");

String memberxmltext = memberelm. asxml ();

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6. Use XPath to quickly find a node. China Network Management Forum bbs.bitscn.com

 

Example of the XML document to be read: bitscn_com

 

<? XML version = "1.0" encoding = "UTF-8"?>

<Projectdescription>

<Name> membermanagement </Name>

<Comment> </comment>

<Projects>

<Project> prj1 </Project>

<Project> prj2 </Project>

<Project> prj3 </Project>

<Project> prj4 </Project>

</Projects>

<Buildspec>

<Buildcommand>

<Name> org. Eclipse. jdt. Core. javabuilder </Name>

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<Arguments>

</Arguments>

</Buildcommand>

</Buildspec>

<Natures>

<Nature> org. Eclipse. jdt. Core. javanature </nature>

</Natures>

</Projectdescription>

 

 

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Use XPath to quickly find the node project.

 

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Public static void main (string [] ARGs ){

Saxreader reader = new saxreader ();

Try {

Document Doc = reader. Read (new file ("sample. xml "));

List projects = Doc. selectnodes ("/projectdescription/projects/Project ");

Iterator it = projects. iterator ();

While (it. hasnext ()){

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Element elm = (element) it. Next ();

System. Out. println (ELM. gettext ());

}

}

Catch (exception ex ){

Ex. printstacktrace ();

}

}