JavaWeb实验报告2-简易选课系统-编写一个Java Web项目，实现依据Cookie自动登录，登录后可以进行课程的简单选课和退课。在第一次登录页面时，需要输入用户名和密码，并可选择一周内不用登录

CaesarChang张旭

发布于 2021-04-19 17:51:25

1K0

发布于 2021-04-19 17:51:25

文章被收录于专栏：悟道悟道

By CaesarChang

写在开头:

现在是: 2021-4-9 22:50 , 今天有空花了1个多小时把它搞了! 在这个项目里面因为没让用SpringMVC的框架,所以这次写了很多个Servlet,如果有框架,我们可以只写一个Servlet就好了. 但凡有点小难度的我都会开源哈! 关注我吧!

首先上动图:

然后是大家喜欢的图片截图:

给大家推荐我自己录制速成课程哈:

数据库概论速成: https://www.bilibili.com/video/BV1jf4y147jz#reply4387410456 javaWeb课设: https://www.bilibili.com/video/BV1bh411D7Wb

代码:

checkLession.jsp

--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>选课</title>
</head>
<body>
2222 开始你的选课吧<br><br>

JSP程序设计 <a href="/add/c1">添加</a>  <a href="/del/c1">删除</a>  <br>
Java程序设计 <a href="/add/c2">添加</a>  <a href="/del/c2">删除</a>  <br>
.Net程序设计 <a href="/add/c3">添加</a>  <a href="/del/c3">删除</a>  <br>
软件工程 <a href="/add/c4">添加</a>  <a href="/del/c4">删除</a>  <br>
Android设计 <a href="/add/c5">添加</a>  <a href="/del/c5">删除</a>  <br><br>
当前你的选课为:<br>
<hr>
</body>
</html>
<%
    if (request.getSession().getAttribute("1") != null) {
        out.write(request.getSession().getAttribute("1").toString());
        out.write("<br>");

    }
    if (request.getSession().getAttribute("2") != null) {
        out.write(request.getSession().getAttribute("2").toString());
        out.write("<br>");    }
    if (request.getSession().getAttribute("3") != null) {
        out.write(request.getSession().getAttribute("3").toString());
        out.write("<br>");    }
    if (request.getSession().getAttribute("4") != null) {
        out.write(request.getSession().getAttribute("4").toString());
        out.write("<br>");
    }
    if (request.getSession().getAttribute("5") != null) {
        out.write(request.getSession().getAttribute("5").toString());
        out.write("<br>");
    }

%>

welcome.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>
<head>
    <title>Title</title>
</head>
<body>

<a  href="checkLession.jsp">开始选课</a><br>

</body>
</html>
<%

    Cookie[] cookies = request.getCookies();

    if ( cookies != null ){
// 如果不为空遍历数组
        for (Cookie cookie : cookies ){
// 获取 cookie 的名字
            String name = cookie.getName();
// 获取 cookie 的键
            String value = cookie.getValue();
            if (name.equals("username") && value.equals("2222")) {
                out.write("欢迎"+value+"访问我们的网站");
                return ;
            }
        }



    }

    if (request.getAttribute("username").equals("2222")) {
        out.write("欢迎"+request.getAttribute("username")+"访问我们的网站");
    }

%>

AddCourse1

@WebServlet("/add/c1")
public class AddCourse1 extends HttpServlet {


    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {


        req.getSession().setAttribute("1","JSP程序设计");
        req.getRequestDispatcher("/checkLession.jsp").forward(req, resp);
    }
}

AddCourse2

@WebServlet("/add/c2")
public class AddCourse2  extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.getSession().setAttribute("2","Java程序设计");

        req.getRequestDispatcher("/checkLession.jsp").forward(req, resp);
    }
}

AddCourse3

@WebServlet("/add/c3")
public class AddCourse3 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.getSession().setAttribute("3",".Net程序设计");
        req.getRequestDispatcher("/checkLession.jsp").forward(req, resp);

    }
}

AddCourse4

/**
 * @Author CaesarChang张旭
 * @Date 2021/4/9  9:17 下午
 * @Version 1.0
 */
@WebServlet("/add/c4")
public class AddCourse4 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.getSession().setAttribute("4","软件工程");
        req.getRequestDispatcher("/checkLession.jsp").forward(req, resp);

    }
}

AddCourse5

/**
 * @Author CaesarChang张旭
 * @Date 2021/4/9  9:17 下午
 * @Version 1.0
 */
@WebServlet("/add/c5")
public class AddCourse5 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.getSession().setAttribute("5","Android程序设计");
        req.getRequestDispatcher("/checkLession.jsp").forward(req, resp);

    }
}

CookieLoginServlet

package com.zx;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Author CaesarChang张旭
 * @Date 2021/4/9  9:28 下午
 * @Version 1.0
 */
@WebServlet("/login")
public class CookieLoginServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        Cookie[] cookies = req.getCookies();

        if ( cookies != null ) {

            for (Cookie cookie : cookies) {

                if (cookie.getName().equals("username") && cookie.getValue().equals("2222")) {

                    resp.sendRedirect("welcome.jsp");
                    return ;
                }

            }
        if(req.getParameter("isSaved")!=null){
            if(req.getParameter("username").equals("2222")&&req.getParameter("isSaved").equals("1")){

                Cookie cookie1 = new Cookie("username", "2222");
                resp.addCookie(cookie1);
                resp.sendRedirect("welcome.jsp");
                return ;
            }
        }


            if(req.getParameter("username").equals("2222")){
                req.setAttribute("username","2222");

                req.getRequestDispatcher("welcome.jsp").forward(req,resp);
                return ;
            }

        }

            resp.sendRedirect("/login.jsp");

    }
}

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原始发表：2021-04-09 ，如有侵权请联系 cloudcommunity@tencent.com 删除

servlet