Java annotations on XML, automatic generation of XML Files-@XML * * *

Uses the JDK's own javax.xml.bind.JAXBContext to convert objects and XML strings to and from each other.        If there is a slight restriction on the XML format to be generated, a little control is needed for the object that generates the XML, and one of the most feasible ways to control the object is to use annotations.        (JDK 1.6 api:http://www.cs.uic.edu/~mcpc/java_docs/api/index.html?javax/xml/bind/jaxbcontext.html) A few of the more commonly used: @XmlRootElement: Root node @XmlAttribute: This property is an attribute of XML @XmlElement: This property is an element of XML and can be added to the attribute (name= "newelemen Tname "), then the elment tag of the generated XML string is Newelementname
Example:

Package test;

Import Java.io.StringWriter;
Import Javax.xml.bind.JAXBContext;
Import javax.xml.bind.JAXBException;

Import Javax.xml.bind.Marshaller;
Import Test.bean.EleClassA;
Import Test.bean.EleClassB;

Import Test.bean.RootClass;
		public class Test1 {public static void main (string[] args) {Rootclass rc = new Rootclass ();
		Eleclassa a = new Eleclassa ();
		
		ELECLASSB B = new ELECLASSB ();
		A.SETATTRC ("Attrc");
		A.setelea ("Elea");
		
		A.seteleb ("Eleb");
		B.setattrpassword ("Attrpassword");
		B.setattrusername ("Attrusrname");
		
		B.setelecode ("Elecode");
		Rc.seta (a);
		Rc.setb (b);
		Rc.setroot ("root");
		
		
		Rc.setroota ("Roota");
		Jaxbcontext context;
			try {context = Jaxbcontext.newinstance (Rootclass.class);
			Marshaller mar = Context.createmarshaller ();
			Mar.setproperty (Marshaller.jaxb_formatted_output, true);
			
			Mar.setproperty (marshaller.jaxb_encoding, "UTF-8");
			
			StringWriter writer = new StringWriter ();
			
			Mar.marshal (RC, writer); System.oUt.println (Writer.tostring ());
		catch (Jaxbexception e) {e.printstacktrace ();

}} package Test.bean;
Import javax.xml.bind.annotation.XmlElement;

Import javax.xml.bind.annotation.XmlRootElement;
	@XmlRootElement (name= "Rootclass") public class Rootclass {private Eleclassa A;
	Private ELECLASSB B;
	private String root;
	
	Private String Roota;
	@XmlElement (name= "Eleclassa") public Eleclassa Geta () {return A;
	} public void SetA (Eleclassa a) {this.a = A;
	@XmlElement (name= "Eleclassa") public ELECLASSB Getb () {return b;
	public void Setb (ELECLASSB b) {this.b = b;
	Public String Getroot () {return root;
	public void Setroot (String root) {this.root = root;
	Public String Getroota () {return roota;
	} public void Setroota (String roota) {This.roota = Roota;

}} package Test.bean;
Import Javax.xml.bind.annotation.XmlAttribute;

Import javax.xml.bind.annotation.XmlElement;
	public class Eleclassa {private String Elea; Private String Eleb;

	Private String attrc;
	@XmlElement public String Getelea () {return elea;
	} public void Setelea (String elea) {This.elea = Elea;
	@XmlElement (name= "Elebnewname") public String Geteleb () {return eleb;
	} public void Seteleb (String eleb) {This.eleb = Eleb;
	@XmlAttribute () public String getattrc () {return attrc;
	} public void Setattrc (String attrc) {this.attrc = ATTRC;

}} package Test.bean;
Import Javax.xml.bind.annotation.XmlAttribute;

Import javax.xml.bind.annotation.XmlElement;
	public class Eleclassb {private String attrusername;
	
	Private String Attrpassword;
	
	Private String Elecode;
	@XmlAttribute public String Getattrusername () {return attrusername;
	} public void Setattrusername (String attrusername) {this.attrusername = Attrusername;
	@XmlAttribute (name= "password") public String Getattrpassword () {return attrpassword; } public void Setattrpassword (String attrpassword) {This.attrpassword = AttrpassWOrd;
	@XmlElement public String Getelecode () {return elecode;
	} public void Setelecode (String elecode) {this.elecode = Elecode;
 }
	
	
}

Run the main method in the Test1 class to perform the result:

<?xml version= "1.0" encoding= "UTF-8" standalone= "yes"?>
<rootclass>
    <eleclassa attrc= "ATTRC" ">
        <eleA>eleA</eleA>
        <elebnewname>eleB</elebnewname>
    </eleClassA>
    <eleclassa attrusername= "Attrusrname" password= "Attrpassword" >
        <elecode>elecode</elecode >
    </EleclassA>
    <root>root</root>
    <rootA>rootA</rootA>
</ Rootclass>