www.pudn.com > EJB3eCode.zip > AccountClient.java

package examples.bmp;  import javax.ejb.*; import javax.naming.*; import java.rmi.*; import javax.rmi.*; import java.util.*;  /**  * Sample client code which manipulates a Bank Account Entity Bean.  */ public class AccountClient  {     public static void main(String[] args)          throws Exception      {         Account account = null;          try {             /*              * Get a reference to the Account Home Object - the              * factory for Account EJB Objects              */             Context ctx = new InitialContext(System.getProperties()); 			             Object obj = ctx.lookup("AccountHome");             AccountHome home =                  (AccountHome) javax.rmi.PortableRemoteObject.narrow(obj, AccountHome.class);              System.err.println("Total of all accounts in bank initially = " +                                 home.getTotalBankValue());              /*              * Use the factory to create the Account EJB Object              */             home.create("123-456-7890", "John Smith");              /*              * Find an account              */             Iterator i = home.findByOwnerName("John Smith").iterator();             if (i.hasNext())              {                 account = (Account)                      javax.rmi.PortableRemoteObject.narrow(i.next(), Account.class);             }             else              {                 throw new Exception("Could not find account");             }              /*              * Call the balance() method, and print it              */             System.out.println("Initial Balance = " + account.getBalance());              /*              * Deposit $100 into the account              */             account.deposit(100);              /*              * Retrieve the resulting balance.              */             System.out.println("After depositing 100, account balance = " +                                 account.getBalance());              System.out.println("Total of all accounts in bank now = " +                                 home.getTotalBankValue());              /*              * Retrieve the Primary Key from the EJB Object              */             AccountPK pk = (AccountPK) account.getPrimaryKey();              /*              * Release our old EJB Object reference.  Now call              * find() again, this time querying on Account ID              * (i.e. the Primary Key).              */             account = null;             account = home.findByPrimaryKey(pk);              /*              * Print out current balance              */             System.out.println("Found account with ID " + pk +                                 ".  Balance = " + account.getBalance());              /*              * Try to withdraw $150              */             System.out.println("Now trying to withdraw $150, which is more than is currently available.  This should generate an exception..");             account.withdraw(150);          }         catch (Exception e)          {             System.out.println("Caught the exception!");             System.out.println("Message: " + e.getMessage());         }         finally          {             /*              * Destroy the Entity permanently              */             try              {                 System.out.println("Destroying account..");                 if (account != null)                  {                     account.remove();                 }             }             catch (Exception e)              {                 e.printStackTrace();             }         }     } }