天若有情

下面通過一個(gè)示例程序來說明JNDI工作原理(代碼為自解釋).

/*
* Created on 2005-3-4
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
package com.sily.jndi;
import java.io.FileInputStream;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
/**
* @author shizy
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
public class TestJbossJNDI {
/**
*
*/
public TestJbossJNDI() {
super();
// TODO Auto-generated constructor stub
}
public static void main(String[] args) { try {
Properties env = new Properties();
//載入jboss的SPI相關(guān)參數(shù),包括初始上下文工廠，服務(wù)URL，等等
env.load(new FileInputStream("jbossJndi.properties"));
env.list(System.out);
//通過JNDI api 初始化上下文
InitialContext ctx = new javax.naming.InitialContext(env);
System.out.println("Got context");
//create a subContext
ctx.createSubcontext("/sylilzy");
ctx.createSubcontext("sylilzy/sily");
//rebind a object
ctx.rebind("sylilzy/sily/a", "I am sily a!");
ctx.rebind("sylilzy/sily/b", "I am sily b!");
//lookup context
Context ctx1=(Context)ctx.lookup("sylilzy");
Context ctx2=(Context)ctx1.lookup("/sylilzy/sily");
ctx2.bind("/sylilzy/g", "this is g");
//lookup binded object
Object o;
o=ctx1.lookup("sily/a");
System.out.println("get object from jndi:"+o);
//rename the object
ctx2.rename("/sylilzy/g", "g1");
o=ctx2.lookup("g1");
System.out.println("get object from jndi:"+o);
} catch (Exception e) {
e.printStackTrace();
}
}
}

結(jié)果輸出如下:

/*
* Created on 2005-3-4
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
package com.sily.jndi;
import java.io.FileInputStream;
import java.util.Properties;
import javax.naming.*;
import javax.naming.Context;
import javax.naming.InitialContext;
/**
* @author shizy
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
public class ListJbossJndi {
/**
*
*/
public ListJbossJndi() {
  super();
  // TODO Auto-generated constructor stub
 }
 public static void main(String[] args) {
  try {
   Properties env = new Properties();
   env.load(new FileInputStream("jbossJndi.properties"));
   //env.list(System.out);
   Context ctx = new InitialContext(env);
   listCtx(ctx.lookup("sylilzy"));
  }
  catch (Exception e) {
   e.printStackTrace();
  }
 }
 static void listCtx(Object o){
  if(!(o instanceof Context))log(":"+o);
  else {
   log("\n-----------------------------");
  try {
   Context ctx=(Context)o;
   //log(ctx.getNameInNamespace()+"/:");
   NamingEnumeration list=ctx.listBindings("");
   while(list.hasMore()){
    Binding bind=(Binding)list.next();
    log("\n/"+ctx.getNameInNamespace()+"/"+bind.getName());
    listCtx(bind.getObject());
   }
   log("\n-----------------------------");
  }
  catch (NamingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
 }
 static void log(Object o){
  System.out.print(o);
 }
}