businessbean.java

网上银行

package proejblayer;

import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.ejb.CreateException;
import javax.naming.*;
import java.math.BigDecimal;

public class BusinessBean implements SessionBean {
    SessionContext sessionContext;
    public void ejbCreate() throws CreateException {
    }

    public void ejbRemove() {
    }

    public void ejbActivate() {
    }

    public void ejbPassivate() {
    }

    public void setSessionContext(SessionContext sessionContext) {
        this.sessionContext = sessionContext;
    }

    public int saveMoney(String accountNo, int money) {
        int result = 0;
        try {
            Context ctx = new InitialContext();
            AccountHome home = (AccountHome) ctx.lookup("Account");
            Account account = home.findByPrimaryKey(accountNo);
            BigDecimal bigmoney = new BigDecimal(money);
            if (account != null) {
                account.setBalance(account.getBalance().add(bigmoney));
                result = 1;
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }
    /* @return int -1 表示余额不足， 0表示操作不成功， 1表示操作成功*/
    public int takeMoney(String accountNo, int money) {
        int result = 0;
        try {
            Context ctx = new InitialContext();
            AccountHome home = (AccountHome) ctx.lookup("Account");
            Account account = home.findByPrimaryKey(accountNo);
            BigDecimal bigmoney = new BigDecimal(money);
            if (account != null) {
                if (account.getBalance().compareTo(bigmoney) >= 0) {
                    account.setBalance(account.getBalance().subtract(bigmoney));
                    result = 1;
                } else {
                    result = -1;
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }

    public BigDecimal  searchMoney(String accountNo) {
         BigDecimal bigmoney = new  BigDecimal(0);
         try {
             Context ctx = new InitialContext();
             AccountHome home = (AccountHome) ctx.lookup("Account");
             Account account = home.findByPrimaryKey(accountNo);
             if (account != null) {
                 bigmoney=account.getBalance();
             }
         } catch (Exception ex) {
             ex.printStackTrace();
         }
         return bigmoney;
    }
/*-3 表示目标帐户被冻结，-2表示目标帐户不存在 -1 表示转帐帐户余额不足,0表示转帐失败,1表示转帐成功*/

    public int transferMoney(String fromaccount, String toaccount, int money) {
        int result = 0;
       try {
           Context ctx = new InitialContext();
           AccountHome home = (AccountHome) ctx.lookup("Account");
           Account faccount = home.findByPrimaryKey(fromaccount);
           Account taccount=home.findByPrimaryKey(toaccount);
           BigDecimal bigmoney = new BigDecimal(money);
         if(taccount==null){
             result=-2;
         }else{
             if(taccount.getStatus().equals("0")){
                 result=-3;
             }
             if(faccount!=null){
                 if(faccount.getBalance().compareTo(bigmoney)<0){
                     result=-1;
                 }else{
                     faccount.setBalance(faccount.getBalance().subtract(bigmoney));
                     taccount.setBalance(taccount.getBalance().add(bigmoney));
                     result=1;
                 }
             }
         }

       } catch (Exception ex) {
           ex.printStackTrace();
       }
       return result;

    }
}