J2EE知识点1 - 银行系统代码1 - 《Java笔记》

package controller;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
public class DepositController extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("UTF-8");
        String username=req.getParameter("username");
        //将响应信息拼接一下
        resp.setCharacterEncoding("UTF-8");
        PrintWriter out= resp.getWriter();
        out.write("<html lang=\"en\">" +
                "    <head>" +
                "        <meta charset=\"UTF-8\">" +
                "    </head>" +
                "    <body>" +
                "        <form action=\"doDeposit\" method=\"post\">" +
                "        请输入存款金额：<input type=\"text\" name=\"depositMoney\" value=\"\"><br>" +
                "        <input type=\"submit\" value=\"确认存款\">" +
                "        <input type=\"hidden\" name=\"username\" value=\""+username+"\">"+
                "        </form>" +
                "    </body>" +
                "</html>");
    }
}

package controller;
import service.AtmService;
import util.MySpring;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
public class DoDepositController extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("UTF-8");
        String username=req.getParameter("username");
        String depositMoney=req.getParameter("depositMoney");
        AtmService atmService= MySpring.getJavaBean("service.AtmService");
        Float money=atmService.dposit(username,Float.parseFloat(depositMoney));
        resp.setCharacterEncoding("UTF-8");
        PrintWriter out= resp.getWriter();
        out.write("<html>");
        out.write("<head>");
        out.write("<meta charset=\"UTF-8\">");
        out.write("<script type=\"text/javascript\">" +
                "            window.onload=function () {" +
                "                var inputElement=document.getElementById(\"back\");" +
                "                inputElement.onclick=function () {" +
                "                    window.history.go(-2);" +
                "                }" +
                "            }" +
                "        </script>");
        out.write("</head>");
        out.write("<body>");
        out.write("存款成功！用户"+username+"您的余额为"+money+"元<br>");
        out.write("<input id=\"back\" type=\"button\" value=\"返回\">");
        out.write("</body>");
        out.write("</html>");
        out.flush();
    }
}

package controller;

import service.AtmService;
import util.MySpring;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class DoTransferController extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("UTF-8");
        String username=req.getParameter("username");
        String transferName=req.getParameter("transferName");
        String transferMoney=req.getParameter("transferMoney");

        AtmService atmService= MySpring.getJavaBean("service.AtmService");
        Float money=atmService.transfer(username,transferName,Float.parseFloat(transferMoney));
        resp.setCharacterEncoding("UTF-8");
        PrintWriter out= resp.getWriter();
        out.write("<html lang=\"en\">" +
                "    <head>" +
                "        <meta charset=\"UTF-8\">" +
                "        <script type=\"text/javascript\">" +
                "            window.onload=function () {" +
                "                var inputElement=document.getElementById(\"back\");" +
                "                inputElement.onclick=function () {" +
                "                    window.history.go(-2);" +
                "                }" +
                "            }" +
                "        </script>" +
                "    </head>" +
                "    <body>" );
        if(money==-1){
            out.write("该用户不存在，转账失败！<br>");
        }else if(money==-2){
            out.write("账户余额不足，转账失败！<br>");
        }else{
            out.write("转账成功!用户"+username+"您的余额为"+money+"元<br>");
        }
        out.write("<input id=\"back\" type=\"button\" value=\"返回\">" +
                "    </body>" +
                "</html>");
    }
}

package controller;

import service.AtmService;
import util.MySpring;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class DoWithdrawController extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("UTF-8");
        String username=req.getParameter("username");
        String withdrawMoney=req.getParameter("withdrawMoney");

        AtmService atmService= MySpring.getJavaBean("service.AtmService");
        Float money=atmService.withdraw(username,Float.parseFloat(withdrawMoney));
        resp.setCharacterEncoding("UTF-8");
        PrintWriter out= resp.getWriter();
        out.write("<html>");
        out.write("<head>");
        out.write("<meta charset=\"UTF-8\">");
        out.write("<script type=\"text/javascript\">" +
                "            window.onload=function () {" +
                "                var inputElement=document.getElementById(\"back\");" +
                "                inputElement.onclick=function () {" +
                "                    window.history.go(-2);" +
                "                }" +
                "            }" +
                "        </script>");
        out.write("</head>");
        out.write("<body>");
        if(money==-1){
            out.write("账户余额不足，取款失败！");
        }else{
            out.write("取款成功！用户"+username+"您的余额为"+money+"元<br>");
        }
        out.write("<input id=\"back\" type=\"button\" value=\"返回\">");
        out.write("</body>");
        out.write("</html>");
        out.flush();
    }
}

package controller;

import service.AtmService;
import util.MySpring;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class LoginController extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("UTF-8");
        String username=req.getParameter("username");
        String password= req.getParameter("password");
        AtmService atmService= MySpring.getJavaBean("service.AtmService");
        String result=atmService.login(username,password);
        System.out.println(result);

        //设置服务器向浏览器发送响应信息的字符集
        resp.setCharacterEncoding("UTF-8");
        PrintWriter out= resp.getWriter();
        out.write("<html>");
        out.write("<head>");
        out.write("<meta charset=\"UTF-8\"");
        out.write("</head>");
        out.write("<body>");
        if("登陆成功".equals(result)){
            out.write("********************<br>欢迎"+username+"进入ATM系统<br>********************<br>");
            out.write("请输入操作选项<br>");
            out.write("<a href=\"query?username="+username+"\">查询</a><br>");
            out.write("<a href=\"deposit?username="+username+"\">存款</a><br>");
            out.write("<a href=\"withdraw?username="+username+"\">取款</a><br>");
            out.write("<a href=\"transfer?username="+username+"\">转账</a><br>");
        }else{
            out.write(result);
        }
        out.write("</body>");
        out.write("</html>");
        out.flush();
    }
}

package controller;

import service.AtmService;
import util.MySpring;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class QueryController extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("UTF-8");
        String username=req.getParameter("username");
        AtmService atmService=MySpring.getJavaBean("service.AtmService");
        Float balance=atmService.inquire(username);

        resp.setCharacterEncoding("UTF-8");
        PrintWriter out= resp.getWriter();
        out.write("<html>");
        out.write("<head>");
        out.write("<meta charset=\"UTF-8\">");
        out.write("<script type=\"text/javascript\">" +
                "            window.onload=function () {" +
                "                var inputElement=document.getElementById(\"back\");" +
                "                inputElement.onclick=function () {" +
                "                    window.history.back();" +
                "                }" +
                "            }" +
                "        </script>");
        out.write("</head>");
        out.write("<body>");
        out.write("用户"+username+"您的余额为"+balance+"元<br>");
        out.write("<input id=\"back\" type=\"button\" value=\"返回\">");
        out.write("</body>");
        out.write("</html>");
        out.flush();
    }
}