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。

复制代码

<%@ 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{
                width: 200px;
                height: 20px;
                border-radius: 5px;
            }
            #tj{
                width: 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>
复制代码

 

 

 

 <%@ 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">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
 
  </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">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
 
  </head>
   
  <body>
    欢迎<%=session.getAttribute("uname") %>！
  </body>
</html>
posted @ 2021-04-08 17:45  清欢渡￥  阅读(34)  评论(0)  编辑  收藏  举报