import javax.naming.InitialContext;
import javax.naming.NamingException;   import com.cithinc.util.Tool;   public class EJBHomeFactory {   private static EJBHomeFactory instance;   private InitialContext context;   private EJBHomeFactory() throws NamingException {   context = Tool.getInitialContext();   }   public static EJBHomeFactory getInstance() throws NamingException {   if (instance == null) {   instance = new EJBHomeFactory();   }   return instance;   }   public Object lookup(String jndiName) throws NamingException {   Object obj = new Object();   obj = context.lookup(jndiName);   return obj;   }
}  import javax.naming.InitialContext;
import javax.naming.NamingException; import com.cithinc.util.Tool; public class EJBHomeFactory {
private static EJBHomeFactory instance;
private InitialContext context; private EJBHomeFactory() throws NamingException {
context = Tool.getInitialContext();
} public static EJBHomeFactory getInstance() throws NamingException {
if (instance == null) {
instance = new EJBHomeFactory();
}
return instance;
} public Object lookup(String jndiName) throws NamingException {
Object obj = new Object();
obj = context.lookup(jndiName);
return obj;
}
} 其中，Tool.java的文件内容如下： Java代码
import java.util.Hashtable;   import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;   public class Tool {   @SuppressWarnings("unchecked")   public static InitialContext getInitialContext() throws NamingException {   Hashtable environment = new Hashtable();   environment.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");   environment.put(Context.URL_PKG_PREFIXES,"org.jboss.naming:org.jnp.interfaces");   environment.put(Context.PROVIDER_URL, "jnp://127.0.0.1:1099");   return new InitialContext(environment);   }
}  import java.util.Hashtable; import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException; public class Tool {
@SuppressWarnings("unchecked")
public static InitialContext getInitialContext() throws NamingException {
Hashtable environment = new Hashtable();
environment.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
environment.put(Context.URL_PKG_PREFIXES,"org.jboss.naming:org.jnp.interfaces");
environment.put(Context.PROVIDER_URL, "jnp://127.0.0.1:1099");
return new InitialContext(environment);
}
} 然后这样调用： Java代码
EJBHomeFactory f = EJBHomeFactory.getInstance();
Object o = f.lookup(remote);  EJBHomeFactory f = EJBHomeFactory.getInstance();
Object o = f.lookup(remote); 这样就可以保证只初始化一次上下文实例，节省大量的时间。