withdrawalservlet.java

EJB的网上银行系统,非常具有参考价值

package bankonlinesystem.openaccount.controller;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.math.BigDecimal;
import javax.rmi.PortableRemoteObject;
import bankonlinesystem.openaccount.dto.*;
import javax.naming.Context;
import bankonlinesystem.common.util.*;
import bankonlinesystem.openaccount.ejb.session.OpenAccountHome;
import bankonlinesystem.openaccount.ejb.session.OpenAccount;

public class withdrawalServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //Initialize global variables
    public void init() throws ServletException {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        PrintWriter out = response.getWriter();
        request.setCharacterEncoding("GBK");
        //取得界面值
        String addMoney = request.getParameter("addMoney").trim();
        System.out.println("取得界面值:"+addMoney);
        //取出会话
        HttpSession session = request.getSession(true);
        if (session.getAttribute("account") != null){
            System.out.println("OK");
        }
        AccountDto accountDto = (AccountDto)session.getAttribute("account");
        System.out.println("得到会话的余额值:"+accountDto.getBalance());
        //比较余额与取款金额是否足够取出
        if(accountDto.getBalance().compareTo(new BigDecimal(addMoney)) < 0){
            session.setAttribute("withMessage","对不起，你的余额不足");
            response.sendRedirect("/WebModele/withdrawal.jsp");
            return;
        }
        try {
            //调用会话bean的Modify方法
            Context context = ContextUtil.getContext();
            Object obj = context.lookup("OpenAccount");
            OpenAccountHome openAccountHome = (OpenAccountHome)PortableRemoteObject.narrow(obj,OpenAccountHome.class);
            OpenAccount openAccount = openAccountHome.create();
            openAccount.modifyMondy(accountDto.getID(),"取款",new BigDecimal(addMoney));
            //更改会话状态
            accountDto = openAccount.getAccount(accountDto.getID());
            session.setAttribute("account",accountDto);
            //取款成功
            session.setAttribute("withMessage","成功取款： "+addMoney+" 元");
            response.sendRedirect("withdrawal.jsp");
        } catch (Exception ex) {
            //失败操作
            session.setAttribute("withMessage","取款失败："+ex.getMessage());
            response.sendRedirect("withdrawal.jsp");
        }

        out.close();
    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        doGet(request, response);
    }

    //Clean up resources
    public void destroy() {
    }
}