学生管理系统--添加、查看功能_怎样在学院管理系统中加入查看学生信息-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_51120880/article/details/119800542

学生管理系统—添加.查看功能

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
  <title>学生管理系统</title>
</head>
<body>

<%--先用jsp判断用户是否登录过--%>
<% Object ob =session.getAttribute("username");

    if (ob==null){
%>
<a href="/stu/login.jsp">请登录</a>

<%} else {%>
<a href="/stu/addStudent.jsp">添加学生</a>
<a href="/stu/listlookStudent">查看学生</a>
<%}%>
</body>
</html>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录页面</title>
</head>
<body>
<form action="/stu/loginServlet" method="get" autocomplete="off">

    姓名:<input type="text" name="username"><br>
    密码:<input type="password" name="password"><br>
    <button type="submit">提交</button>
</form>

</body>
</html>

@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {

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

        //获取用户名和密码
        String username = req.getParameter("username");
        String password = req.getParameter("password");

        //进行判断
        if (username==null || "".equals(username)){
            //进行判断后如果获取不到用户名,重定向到登录页面
            resp.sendRedirect("/stu/login.jsp");
            return;
        }

        //获取会话域对象
        HttpSession session = req.getSession();

        //设置会话域共享数据
        session.setAttribute("username",username);

        //并进行重定向
        resp.sendRedirect("/stu/index.jsp");

    }

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

        doGet(req, resp);
    }
}

@WebServlet("/AddStudent")
public class addStudent extends HttpServlet {

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

        //获取数据
        String username = req.getParameter("username");

        String age = req.getParameter("age");

        String score = req.getParameter("score");

        //创建学生对象进行封装
        Student st = new Student();

        st.setUsername("张三");
        //Integer.parseInt 方法将int类型转化成字符串类型
        st.setAge(Integer.parseInt(age));

        st.setScore(Integer.parseInt(score));

        //创建输入流保存数据
        BufferedWriter bu = new BufferedWriter(new FileWriter("D:\\a.txt",true));
        //保存到文件内
        bu.write(st.getUsername()+","+st.getAge()+","+st.getScore());

        resp.setContentType("text/html;charset=UTF-8");
        //创建输出流 .给出相应提示
        resp.getWriter().write("保存成功,三秒钟后将跳转到主页面");

        resp.setHeader("Refresh","3;URL=/stu/index.jsp");

        bu.close();
    }

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

        doGet(req, resp);
    }
}

@WebServlet("/AddStudent")
public class addStudent extends HttpServlet {

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

        //获取数据
        String username = req.getParameter("username");

        String age = req.getParameter("age");

        String score = req.getParameter("score");

        //创建学生对象进行封装
        Student st = new Student();

        st.setUsername("张三");
        //Integer.parseInt 方法将int类型转化成字符串类型
        st.setAge(Integer.parseInt(age));

        st.setScore(Integer.parseInt(score));

        //创建输入流保存数据
        BufferedWriter bu = new BufferedWriter(new FileWriter("D:\\a.txt",true));
        //保存到文件内
        bu.write(st.getUsername()+","+st.getAge()+","+st.getScore());

        resp.setContentType("text/html;charset=UTF-8");
        //创建输出流 .给出相应提示
        resp.getWriter().write("保存成功,三秒钟后将跳转到主页面");

        resp.setHeader("Refresh","3;URL=/stu/index.jsp");

        bu.close();
    }

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

        doGet(req, resp);
    }
}

<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="com.itheima.Cookie.Student" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>查看页面</title>
</head>
<body>


<table width="600px" border="1px">
    <tr>
        <th>学生姓名</th>
        <th>学生年龄</th>
        <th>学生成绩</th>
    </tr>

    <%--进行强转--%>
    <% ArrayList<Student> list = (ArrayList<Student>) session.getAttribute("username");
        for (Student stu : list) {


    %>

    <tr align="center">
        <td><%=stu.getUsername()%>
        </td>
        <td><%=stu.getAge()%>
        </td>
        <td><%=stu.getScore()%>
        </td>

    </tr>
    <%}%>
</table>
</body>
</html>