XML series: (7) XML parsing-dom4j Dom parsing method update xml

Dom4j tool, is unofficial, not in the JDK.

Steps to use:

1) Import the core package of dom4j. Dom4j-1.6.1.jar

2) write the code dom4j read the XML file

1. Update xml

1.1. Write content to XML document

Package Com.rk.xml.g_dom4j_write;import Java.io.file;import Java.io.fileoutputstream;import org.dom4j.Document; Import Org.dom4j.io.saxreader;import org.dom4j.io.xmlwriter;/** * First write content to XML document * @author RK * */public class Demo01{publ IC static void Main (string[] args) throws exception{//one, reads or creates a Document Object document DOC = new Saxreader (). Read (New File ("./ Src/animals.xml "));//second, modify the Document object content//third, write the modified document object to the XML document//Specify the location of the file output FileOutputStream OutStream = new FileOutputStream ("D:/rk/result.xml");//1. Create write-out object XMLWriter writer = new XMLWriter (outstream);//2. Write Document Object Writer.write (DOC);//3. Close Stream Writer.close (); System.out.println ("Execution is over!") ");}}

1.2. Write down the details of the content to the XML document

Package com.rk.xml.g_dom4j_write;import java.io.file;import java.io.fileoutputstream;import  org.dom4j.Document;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import  org.dom4j.io.xmlwriter;/** *  discusses the details of writing content to XML documents  *  @author  RK * */public  Class demo02{public static void main (String[] args)  throws exception{ Document doc = new saxreader (). Read (New file ("./src/animals2.xml"));/** *  1. Specify the written format  *///outputformat format = outputformat.createcompactformat ();// Compact format. Removes whitespace wrapping. When the project is on line Outputformat format = outputformat.createprettyprint ();// Nice format. There are spaces and line breaks./** * 2 when developing and debugging. Specifies the encoding of the generated XML document  *     also affects the encoding of the XML document when it is saved    Encoding encoding for   xml document declaration (encoding at XML parsing)  *     conclusion:  Use this method to generate XML documents to avoid Chinese garbled problems.  */format.setencoding ("UTF-8");//Specify the location of the file output FileoutputstreaM outstream = new fileoutputstream ("D:/rk/result.xml");//1. Create a write-out object Xmlwriter writer  = new xmlwriter (Outstream, format);//2. Write the Document Object Writer.write (DOC);//3. Close Stream Writer.close ( ); System.out.println ("Execution is over!") ");}}

1.3. Modify the XML content: Add, modify, delete

Package com.rk.xml.g_dom4j_write;import java.io.file;import java.io.fileoutputstream;import  org.dom4j.Document;import org.dom4j.DocumentHelper;import org.dom4j.Node;import  org.dom4j.element;import org.dom4j.attribute;import org.dom4j.text;import  org.dom4j.io.saxreader;import org.dom4j.io.xmlwriter;import org.dom4j.io.outputformat;import  org.junit.test;/** *  Modify XML Content  *  add: document, Tag  , Properties  *  Modify: Attribute value, text  *  Delete: label, Properties  *  @author  RK * */public class Demo03{/** *  add: Document, Tag  , properties  */@Testpublic  void testadd ()  throws exception{//1. Creating a document document doc =  Documenthelper.createdocument ();//2. Add Label element rootelement = doc.addelement ("ContactList"); Element contactelement = rootelement.addelement ("contact"); Element nameelement = contactelement.addelement ("Name"); Nameelement.setteXT ("Xiaoming");//3. Add attribute Contactelement.addattribute ("id",  "c001"); Contactelement.addattribute ("Region",  "Beijing )//write the modified document object to the XML document Fileoutputstream out = new fileoutputstream ("d:/rk/ Contact.xml "); Outputformat format = outputformat.createprettyprint (); Format.setEncoding (" Utf-8 " ); Xmlwriter writer = new xmlwriter (Out,format); Writer.write (doc); Writer.close (); System.out.println ("Execution is over!") ");} /** *  Modify: Attribute value, text  */@Testpublic  void testmodify ()  throws exception{document  doc = new saxreader (). Read (New file ("./src/animals.xml"));/** *  scheme one:  Modify the property value    1. Gets the Label object  2.  3. Modify the property value  *///1.1   get the Label object element  Catelement = doc.getrootelement (). Element ("Cat");//1.2  Gets the Property object attribute catattr =  catelement.attribute ("id");//1.3  Modify the property value Catattr.setvalue ("C100");/** *  scenario two:  Modify the property value  *///2.1 &nBSP; element dogelement = doc.getrootelement (). Element ("Dog");//2.2  by adding a property of the same name, Modify the property value Dogelement.addattribute ("id",  "d100");/** *  Modify the text  1. Gets the Label object  2. Modify Text  */element  nameelement = doc.getrootelement (). Element ("Cat"). Element ("Home"); Nameelement.settext ("Sixth Universe"); Fileoutputstream out = new fileoutputstream ("D:/rk/animals.xml"); OutputFormat format  = outputformat.createprettyprint (); Format.setencoding ("Utf-8"); Xmlwriter writer = new xmlwriter (Out,format); Writer.write (doc); Writer.close (); System.out.println ("Execution is over!") ");} /** *  Delete: Tags, properties  */@Testpublic  void testdelete ()  throws exception{document  doc = new saxreader (). Read (New file ("./src/animals.xml"));/** * 1. deleting tags      1.1  get Tag Object   1.2  Delete Tag object      *///  1.1  get Tagged object element nameelement&nBsp;= doc.getrootelement (). Element ("Cat"). Element ("Home");//1.2  Delete tag object Nameelement.detach ();// Nameelement.getparent (). Remove (nameelement),/** * 2. Delete Property    2.1 Get Property Object   2.2   Delete attribute  */element catelement = doc.getrootelement (). Element ("Cat");//2.1 Get Property object attribute  idattr = catelement.attribute ("id");//2.2  delete attribute Idattr.detach ();//idattr.getparent (). Remove (IDATTR); Fileoutputstream out = new fileoutputstream ("D:/rk/animals.xml"); OutputFormat format  = outputformat.createprettyprint (); Format.setencoding ("Utf-8"); Xmlwriter writer = new xmlwriter (Out,format); Writer.write (doc); Writer.close (); System.out.println ("Execution is over!") ");}}

2. Mind Mapping

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XML series: (7) XML parsing-dom4j Dom parsing method update xml