converterbean.java

一个java写的加密算法

/*
 * Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

package samples.rmi.simple.ejb;

import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import java.math.*;

/**
 * A simple stateless bean for the Converter application. 
 * This bean implements all business method as declared 
 * by the remote interface.
 */
public class ConverterBean implements SessionBean {

    BigDecimal yenRate = new BigDecimal("121.6000");
    BigDecimal euroRate = new BigDecimal("0.0077");

    /**
     * Returns the yen value for given dollar amount.
     * @param dollars Dollar amount tobe converted to yen.
     */
    public BigDecimal dollarToYen(BigDecimal dollars) {
        BigDecimal result = dollars.multiply(yenRate);
        return result.setScale(2,BigDecimal.ROUND_UP);
    }

    /**
     * Returns the euro value for given yen amount.
     * @param yen Yen amount tobe converted to euro.
     */
    public BigDecimal yenToEuro(BigDecimal yen) {
        BigDecimal result = yen.multiply(euroRate);
        return result.setScale(2,BigDecimal.ROUND_UP);
    }

    /**
     * Required by EJB spec.
     */
    public ConverterBean() {}

    /**
     * Creates a bean. Required by EJB spec.
     * @exception throws CreateException.
     */
    public void ejbCreate() {}

    /**
     * Removes the bean. Required by EJB spec.
     */
    public void ejbRemove() {}

    /**
     * Loads the state of the bean from secondary storage. Required by EJB spec.
     */
    public void ejbActivate() {}
    
    /**
     * Keeps the state of the bean to secondary storage. Required by EJB spec.
     */
    public void ejbPassivate() {}

    /**
     * Sets the session context. Required by EJB spec.
     * @param sc A SessionContext object.
     */
   public void setSessionContext(SessionContext sc) {}

} // ConverterBean