Java第六次作业

zoukankan html css js c++ java

Java第六次作业
1.安装MySQL数据库，建立用户表 uid uname upwd 并插入3条数据

2.制作jsp登录页面 login.jsp 提交到dologin.jsp，使用jdbc连数据库，判断输入的用户名密码是否存在

3.如果存在，把用户名保存在SESSION中，跳转到welcome.jsp，welcome.jsp中读取session中的用户名，显示欢迎你xxx

4.若不存在，跳到登录页面。
```
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"

    %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
        <style type="text/css">
            body{
                background-color: azure;
            }
            form{
                position: fixed;
                top: 250px;
                left: 650px;
                background-color: #ADD8E6;
                border-radius: 5px;
            }
            div{
                font-size: 22px;
                margin-top: 20px;
                padding-left: 40px;
            }
            input{
                 200px;
                height: 20px;
                border-radius: 5px;
            }
            #tj{
                 80px;
                height: 30px;
        
                margin-left: 140px;
                    border-radius: 5px;
                    font-size: 16px;
                    margin-bottom: 20px;
            }
        </style>
        
</head>
<body>
    <form action="/school/Login.jsp" method="post">
                <div>账 号:&nbsp;&nbsp;&nbsp;&nbsp;<input type="text" name="username"></div>
                <div>密 码:&nbsp;&nbsp;&nbsp;&nbsp;<input type="text" name="password"></div>
                <div>验 证 码:<input type="text" name = "yanzhengma"> <img   src="getcode" alt="看不清，换一张" onclick="change(this)"/></div>
                <div><input type="submit" id="tj" value="登录" ></div>
            </form>

</body>
<script type="text/javascript">
    function  change(img) {
        img.src = "getcode?"+new Date().getTime();
        
    }
</script>
</html>
```
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ page import="java.sql.*" %>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">



    <title>My JSP 'dologin.jsp' starting page</title>



    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    

  </head>



  <body>



    <%

        String Name = request.getParameter("user");  //获取输入的用户名

        String ps = request.getParameter("password");  // 密码

        String code = request.getParameter("code");   //验证码

        Name.trim();  //去空格

        ps.trim();





        PreparedStatement pre = null;

        Connection con =null;

        Statement sql;

        ResultSet rs;

        request.setCharacterEncoding("utf-8");



        try{

            Class.forName("com.mysql.jdbc.Driver");

        }catch(Exception e){

            out.print("<h1>加载错误"+e);

        }





        String user = "root";

        String password="root";





        con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test",user,password);





        try{

            sql = con.createStatement();



            String SQLL = "select * from user where uname=? and upwd=?";

            pre=con.prepareStatement(SQLL);

            pre.setString(1,Name);

            pre.setString(2,ps);





            rs = pre.executeQuery();



            if(rs.next()){

                String na = rs.getString(2);

                session.setAttribute("uname",na);

                response.sendRedirect("welcome.jsp");

            }else{

            %>

            <script >         //弹窗提示

            alert('输入密码或用户名错误');

            </script>

            <%

                response.sendRedirect("index.jsp");

            }

        }catch(SQLException e){

            out.print("<h1>查询错误"+e);

        }

  %>

  </body>

</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">



    <title>My JSP 'welcome.jsp' starting page</title>



    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    

  </head>



  <body>

    欢迎<%=session.getAttribute("uname") %>！

  </body>

</html>
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原文地址：https://www.cnblogs.com/immortals0/p/14633573.html