Java uses DOM4J to manipulate XML sample code _java

DOM4J is a very good Java XML API with excellent performance, powerful features and extreme ease of use, and it is also an open source tool. Can be downloaded at this address http://dom4j.sourceforge.net.
The dom4j we use here is dom4j-1.6.1 this version, we only need to use the following two jar packages:

Copy Code code as follows:

Dom4j-1.6.1.jar
Commons-io-2.4.jar

1. DOM4J Read XML strings

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Import org.dom4j.Document;
Import org.dom4j.DocumentException;
Import Org.dom4j.DocumentHelper;
Import org.dom4j.Element;

public class Testreadxmlstring {
public static void Main (string[] args) throws Documentexception {
String readline = "<?xml version=\" 1.0\ encoding=\ "utf-8\" ><students><student sid=\ "001\" > <id >001</id><name> Grey Machine </name> <age>18</age> </student></students> ";
Document document = Documenthelper.parsetext (ReadLine);
Element Rootelm = Document.getrootelement ();
System.out.println ("rootelement:" + rootelm.getname ());
Element student = rootelm.element ("student");
Element id = student.element ("id");
Element name = student.element ("name");
Element age = student.element (' age ');
System.out.println (Id.gettext ());
System.out.println (Name.gettext ());
System.out.println (Age.gettext ());
}
}

2. dom4j Create XML file

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Import org.dom4j.Document;
Import Org.dom4j.DocumentHelper;
Import org.dom4j.Element;
Import Org.dom4j.io.OutputFormat;
public class Testwritexmlstring {
public static void Main (string[] args) {
OutputFormat format = Outputformat.createprettyprint ();
1. Construct an empty document
Document doc = Documenthelper.createdocument ();
Doc.addcomment ("This is a comment");
2. Constructing the root element
Element ROOTELMT = doc.addelement ("users");
Rootelmt.addnamespace ("Test", "www.test.com");

Element USERELMT = rootelmt.addelement ("user");
Userelmt.addattribute ("Number", "1001");
Userelmt.addelement ("name"). SetText ("Zhangsan");
Userelmt.addelement ("Age"). SetText ("20");
Userelmt.addelement ("Gender"). SetText ("Mail");

Element userElmt2 = rootelmt.addelement ("user");
Userelmt.addattribute ("number", "1002");
Userelmt2.addelement ("name"). SetText ("Zhangsan");
Userelmt2.addelement ("Age"). SetText ("20");
Userelmt2.addelement ("Gender"). SetText ("Mail");

System.out.println (Doc.asxml (). ReplaceAll ("\ n", ""));
}
}

3. Read or write XML files

reading XML files

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Saxreader reader = new Saxreader ();
String Path = "E:/workspaces/myeclipse 8.6/xmltest/file/student.xml";
Document document = Reader.read (new File (path));

Write XML file

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OutputFormat format = Outputformat.createprettyprint ();
Format.setencoding ("Utf-8");//Set the encoding format of the XML file
String FilePath = "E:/workspaces/myeclipse 8.6/xmltest/file/student.xml";
Document document = Documenthelper.createdocument ();
Doc.addcomment ("This is a comment");

/Create Document Content

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XMLWriter writer = new XMLWriter (new FileWriter (FilePath), format);//write to specified file
Writer.write (document);
Writer.close ();