transferservlet.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 bankonlinesystem.openaccount.dto.AccountDto;
import javax.naming.Context;
import bankonlinesystem.openaccount.ejb.session.OpenAccountHome;
import javax.rmi.PortableRemoteObject;
import bankonlinesystem.common.util.ContextUtil;
import bankonlinesystem.openaccount.ejb.session.OpenAccount;

public class transferServlet 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");
        //取出页面的值
        String id = request.getParameter("id").trim();
        String money = request.getParameter("money").trim();
        //取出会话
        HttpSession session = request.getSession(true);

        if (session.getAttribute("account") != null){
            System.out.println("OK");
        }

        AccountDto accountDto = (AccountDto)session.getAttribute("account");
        //判断转帐的余额是否足够
        if(accountDto.getBalance().compareTo(new BigDecimal(money)) < 0){
           session.setAttribute("transferMessage","对不起，你的余额不足,不能进行转帐");
           response.sendRedirect("/WebModule/transfer.jsp");
           return;
       }
        try {
            Context context = ContextUtil.getContext();
           Object obj = context.lookup("OpenAccount");
           OpenAccountHome openAccountHome = (OpenAccountHome)PortableRemoteObject.narrow(obj,OpenAccountHome.class);
           OpenAccount openAccount = openAccountHome.create();
           //调用存款的方法
           openAccount.modifyMondy(id,"存款",new BigDecimal(money));
           //调用取款的方法
           openAccount.modifyMondy(accountDto.getID(),"取款",new BigDecimal(money));
           //重新存入已更改的session
            obj = openAccount.getAccount(accountDto.getID());
            session.setAttribute("account",obj);
            //显示转帐成功！
            session.setAttribute("transferMessage","你已经成功将 "+money+" 元转入到"+id);
            response.sendRedirect("/WebModule/transfer.jsp");
        } catch (Exception ex) {
            session.setAttribute("transferMessage","转帐失败！");
            response.sendRedirect("/WebModule/transfer.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() {
    }
}