Java uses jdom to parse XML files

How do you parse an XML file using Jdom in Java? The following small series on the example for you to introduce a detailed. Need friends can refer to the next

Jdom is an open source project that uses pure Java technology to parse, generate, serialize, and manipulate XML documents based on a tree-structured architecture. Jdom directly for Java programming services. It leverages the many features of the more powerful Java language (method overload, set concepts, and mappings) to effectively combine the functionality of Sax and DOM.
Jdom's official address:http://www.jdom.org/
1. First create a new interface and 2 classes to prepare for follow-up
[Moveable.java]

Copy Code code as follows:


package com.njupt.zhb.test;


public interface Moveable {


void Run ();


}

[Plane.java]

Copy Code code as follows:


package com.njupt.zhb.test;


public class Plane implements moveable {


@Override


public void Run () {


//TODO auto-generated method stub


System.out.println ("The plane is soaring ...");


 }


}

[Train.java]

Copy Code code as follows:


package com.njupt.zhb.test;


public class Train implements moveable{


@Override


public void Run () {


System.out.println ("The Train is flying ...");


 }





}

2. Create a new interface, the main program can call the Getbean method, get the corresponding object.

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package com.njupt.zhb.test;


public interface Beanfactory {


Object Getbean (String ID);


}

3. The XML file that needs to be parsed is as follows:

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


<beans>


<bean


id= "Train"


class= "Com.njupt.zhb.test.Train" >


</bean>


<bean


id= "Plane"


class= "Com.njupt.zhb.test.Plane" >


</bean>


</beans>

4. Parsing the main class of the file, implements the Beanfactory interface.

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package com.njupt.zhb.test;


import Java.util.HashMap;


import java.util.List;


import Java.util.Map;


import org.jdom.Document;


import org.jdom.Element;


import Org.jdom.input.SAXBuilder;


import Org.jdom.xpath.XPath;


public class Classpathxmlapplicationcontext implements Beanfactory {


private map<string, object> mapcontainer = new hashmap<string, object> ();//to store parsed IDs and objects


public Classpathxmlapplicationcontext (String fileName) throws Exception {


Saxbuilder sb = new Saxbuilder ();


Document doc = Sb.build (This.getclass (). getClassLoader ()


. getResourceAsStream (FileName));


Element root = doc.getrootelement ();


list = Xpath.selectnodes (Root, "/beans/bean");//Get all the values under this node


System.out.println (List.size ());


for (int i = 0; i < list.size (); i++) {


Element bean = (Element) list.get (i);


String id = bean.getattributevalue ("id");//Get the value corresponding to the ID


String clazz = Bean.getattributevalue ("class");//Get class corresponding value


object o = Class.forName (clazz). newinstance ();//java reflection mechanism, generate object based on class name


mapcontainer.put (ID, O);//Save in Map


System.out.println (id + "" + clazz);


}


 }


@Override


public Object Getbean (String id) {


return Mapcontainer.get (ID);


 }


}

5. Main program Testmain call.

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package com.njupt.zhb.test;


public class Testmain {


public static void Main (string[] args) throws Exception {


beanfactory f = new Classpathxmlapplicationcontext (


"Com/njupt/zhb/test/sample.xml");


Object obj1 = F.getbean ("Train");//Get Label train objects


Moveable M1 = (moveable) obj1;//interface invoke subclass


M1.run ();


  // //----------------------


Object obj2 = F.getbean ("plane");


Moveable m2 = (moveable) obj2;


M2.run ();





 }


}

Experimental Results:

Copy Code code as follows:


2


Train Com.njupt.zhb.test.Train


plane Com.njupt.zhb.test.Plane

The
train is flying ...


plane is flying ...