accountclient.java

Java2程序设计150例德源代码

package account;

import javax.naming.*;
import java.util.*;

public class AccountClient {
	public static void main(String[] args) throws Exception {
		Account account = null;
		try { // 获取一个本地对象的引用
			Properties p = new Properties();
			p.setProperty(
				"java.naming.factory.initial",
				"org.jnp.interfaces.NamingContextFactory");
			p.setProperty("java.naming.provider.url", "localhost:1099");
			//  获得名称上下文空间
			InitialContext jndiContext = new InitialContext(p);
			System.out.println("Got context");

			//jboss默认jndi名为ejb-jar.xml中的:ejb-name
			Context ctx = new InitialContext(p);
			Object obj = ctx.lookup("Account");
			AccountHome home = (AccountHome) obj;
			System.err.println(
				"Total of all accounts in bank initially = "
					+ home.getTotalBankValue());
			// 生成EJB对象
			home.create("123456789", "Kate Green");
			// 查找一个账户
			Iterator i = home.findByOwnerName("Kate Green").iterator();
			if (i.hasNext()) {
				account = (Account) i.next();
				javax.rmi.PortableRemoteObject.narrow(account, Account.class);
			} else {
				throw new Exception("Could not find account");
			}
			// 调用balance()方法，并打印输出
			System.out.println("Initial Balance = " + account.getBalance());
			// 存款100
			account.deposit(100);
			System.out.println(
				"After depositing 100, account balance = "
					+ account.getBalance());
			System.out.println(
				"Total of all accounts in bank now = "
					+ home.getTotalBankValue());
			// 提取EJB对象的主键
			AccountPK pk = (AccountPK) account.getPrimaryKey();
			// 释放我们的老的EJB对象的引用，通过ID主键号查找
			account = null;
			account = home.findByPrimaryKey(pk);
			// 打印现有的余额
			System.out.println(
				"Found account with ID "
					+ pk
					+ " Balance = "
					+ account.getBalance());
			//取款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 exception!\n" + e);
			// e.printStackTrace();
		} finally { // 永久的删除实体
			try {
				System.out.println("Destroying account..");
				if (account != null) {
					account.remove();
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}