JNDI/LDAP - 获取连接池对象

import java.util.Hashtable;   
  
import javax.naming.Context;   
import javax.naming.NamingException;   
import javax.naming.directory.DirContext;   
import javax.naming.directory.InitialDirContext;   
  
/**  
* Demonstrates how to enable connection pooling. Use debug option to observe  
* connection usage.  
*   
* usage: java -Dcom.sun.jndi.ldap.connect.pool.debug=fine UsePool  
*/  
class UsePool {   
  public static void main(String[] args) {   
    // Set up environment for creating 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");   
  
    // Enable connection pooling   
    env.put("com.sun.jndi.ldap.connect.pool", "true");   
  
    try {   
      // Create one initial context (Get connection from pool)   
      DirContext ctx = new InitialDirContext(env);   
  
      System.out.println(ctx.getAttributes("ou=NewHires"));   
  
      // do something useful with ctx   
  
      // Close the context when we're done   
      ctx.close(); // Return connection to pool   
  
      // Create another initial context (Get connection from pool)   
      DirContext ctx2 = new InitialDirContext(env);   
  
      System.out.println(ctx2.getAttributes("ou=People"));   
  
      // do something useful with ctx2   
  
      // Close the context when we're done   
      ctx2.close(); // Return connection to pool   
  
    } catch (NamingException e) {   
      e.printStackTrace();   
    }   
  }   
}