Java implementation Spring's method of configuring Java classes in XML _java

1. Create your own bean file: beans.xml

<?xml version= "1.0" encoding= "UTF-8"?>
<busi-beans>
	<beans>
		<bean id= " Syshelloimpl "type=" Com.cxm.test.SysHello ">
			<desc>test</desc>
			<impl-class> com.cxm.test.syshelloimpl</impl-class>
		</bean>		
	</beans>		
</busi-beans>

2. Provide analytic XML class: Xmlutils

/** * * * * * * Package com.cxm.xmlutil;
Import Java.io.InputStream;
Import Java.util.Iterator;

Import Java.util.Map;
Import Org.jdom.Attribute;
Import org.jdom.Document;
Import org.jdom.Element;
Import Org.jdom.input.SAXBuilder;

Import Org.jdom.xpath.XPath;



Import Com.cxm.beaninfo.BeanInfo; /** * @author Admin * */public class Xmlutils {public static void Parsexmldef (InputStream in, Map<string,beani
		Nfo> Beandefmap, StringBuffer sb) throws Exception {Saxbuilder reader = new Saxbuilder (false);
		Document doc = null;
			try {doc = Reader.build (in);
			Iterator Beanit = xpath.selectnodes (Doc, "/busi-beans/beans/bean"). iterator ();
			Element e;
			BeanInfo Beandef;
				while (Beanit.hasnext ()) {beandef = new BeanInfo ();
				E = (Element) beanit.next ();
				Attribute Attrid = E.getattribute ("id");
				Attribute Attrtype = E.getattribute ("type");
				Attribute Singletype = E.getattribute ("single");
				Boolean issingle = true; if (null!= singletype&& "1". Equals (Singletype.getvalue ())) {issingle= false;
				} beandef.setsingle (Issingle);
				Beandef.setbeanid (Attrid.getvalue ());
				Beandef.settype (Attrtype.getvalue ());
				Beandef.setbeandesc (GetText (E, "desc"));
				Beandef.setimplclassname (GetText (E, "Impl-class"));
			Process initialization Parameters Beandefmap.put (Attrid.getvalue (), beandef);
		} catch (Exception e) {e.printstacktrace (); }/** * Based on the specified element, XPath gets the contents of the XML document * * @param p_element * @param p_xpath * @return * @throws exceptio
		n */public static String GetText (Element p_element, String p_xpath) throws Exception {String text = null;
		Element e= (Element) Xpath.selectsinglenode (P_element,p_xpath);
		if (e!= null) {text = E.gettext ();
	} else {} return text; }
}

3. Define Bean IO

/** * * */package com.cxm.beaninfo;
	
	/** * @author Admin * */public class BeanInfo {private String Beanid;
	
	Private String type;
	
	Private String Beandesc;
	Public String Getbeandesc () {return beandesc;
	} public void Setbeandesc (String beandesc) {this.beandesc = Beandesc;
	Public String GetType () {return type;
	public void SetType (String type) {this.type = type;
	
	Private String Implclassname;
	Public String Getbeanid () {return beanid;
	} public void Setbeanid (String beanid) {This.beanid = Beanid;
	Public String Getimplclassname () {return implclassname;
	} public void Setimplclassname (String implclassname) {this.implclassname = Implclassname;
	public Boolean Issingle () {return issingle;
	} public void SetSingle (Boolean issingle) {this.issingle = Issingle;
	
Private Boolean issingle = true; }

4.bean creation class: Beanutil

/** * * * * * * Package com.cxm.bean;
	/** * @author Admin * */public class Beanutil {private static xmlbeanfactory factory = new Xmlbeanfactory (); /** * Get the defined Bean Object * @param p_beanid * @return * @throws Exception */public static object Createbean (String p
	_beanid) throws Exception {return Factory.createbean (P_beanid);

}/** * * */package Com.cxm.bean;
Import java.io.FileNotFoundException;
Import Java.io.InputStream;
Import Java.lang.reflect.Constructor;
Import Java.util.HashMap;

Import Java.util.Map;
Import Com.cxm.beaninfo.BeanInfo;
Import com.cxm.exception.NoSuchBeanDefinitionException;

Import Com.cxm.xmlutil.XmlUtils;
	
	/** * @author Admin * */public class Xmlbeanfactory {private static String Bean_xml = "/beans.xml";
	
	private static map<string,beaninfo> Beandefmap = new hashmap<string,beaninfo> ();
	
	private static map<string,object> Instancemap = new hashmap<string,object> (); static {InputStream in = XmlbeanFactory.class.getResourceAsStream (Bean_xml);
			if (in ==null) {try{throw new FileNotFoundException ();
			}catch (FileNotFoundException e) {e.printstacktrace ();
		} stringbuffer sb = new StringBuffer ();
		try {xmlutils.parsexmldef (in, Beandefmap, SB);
		catch (Exception e) {throw new RuntimeException (); } public Object Createbean (String beanid) throws exception{if (Beanid==null | | Beanid.trim () = "") {throw new Ex
		Ception ("Beanid can not NULL or" ");
		} BeanInfo BeanInfo = Beandefmap.get (Beanid);
		if (null ==beaninfo) {throw new Nosuchbeandefinitionexception ("Beanid is isn't define in XML");
		} Object instance;
			if (Beaninfo.issingle ()) {instance =instancemap.get (Beanid);
			if (null!= instance) {return instance;
		} String Implclass = Beaninfo.getimplclassname ();
		Constructor<?> constructor = Class.forName (Implclass.trim ()). GetConstructor ();
		Instance = Constructor.newinstance ();
		if (Beaninfo.issingle ()) {	Instancemap.put (Beanid, instance);
	return instance; }
}

5. Test:

/**
 * * * * * *
package com.cxm.test;

/**
 * @author Admin
 *
 *
/public interface Syshello
{
	void Syshello ();
}

 

/**
 * * * * * *
package com.cxm.test;

/**
 * @author Admin * */Public
class Syshelloimpl implements Syshello
{

	@Override Public
	void Syshello ()
	{
		System.out.println ("Hello world!");
		
	}

 

/**
 * * * * * *
package com.cxm.test;

Import Com.cxm.bean.BeanUtil;

/**
 * @author Admin * */Public
class Test
{
	
	/**
	 * @param args
	 * @throws Exception 
	 */public
	static void Main (string[] args) throws Exception
	{
		Syshello s = (Syshello) Beanutil.createbean ("Syshelloimpl");
		S.syshello ();
	}
	

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