JNDI/LDAP - 删除一个绑定

import java.util.Hashtable;   
  
import javax.naming.Context;   
import javax.naming.InitialContext;   
import javax.naming.NameNotFoundException;   
import javax.naming.NamingException;   
  
/**  
* Demonstrates how to remove a binding. (Use after Bind or Rebind example).  
*   
* usage: java Unbind  
*/  
class Unbind {   
  public static void main(String[] args) {   
  
    // Set up the environment for creating the initial context   
    Hashtable<String, Object> env = new Hashtable<String, Object>(11);   
    env   
        .put(Context.INITIAL_CONTEXT_FACTORY,   
            "com.sun.jndi.ldap.LdapCtxFactory");   
    env.put(Context.PROVIDER_URL, "ldap://localhost:389/o=JNDITutorial");   
  
    try {   
      // Create the initial context   
      Context ctx = new InitialContext(env);   
  
      // Remove the binding   
      ctx.unbind("cn=Favorite Fruit");   
  
      // Check that it is gone   
      Object obj = null;   
      try {   
        obj = ctx.lookup("cn=Favorite Fruit");   
      } catch (NameNotFoundException ne) {   
        System.out.println("unbind successful");   
        return;   
      }   
  
      System.out.println("unbind failed; object still there: " + obj);   
  
      // Close the context when we're done   
      ctx.close();   
    } catch (NamingException e) {   
      System.out.println("Operation failed: " + e);   
    }   
  }   
}