jsp第六次作业

使用jdbc验证登录，session保存信息，跳转

<%@ 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>

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"
    import=" javax.servlet.http.HttpSession"
    %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("UTF-8");
 HttpSession s = request.getSession();

 String username = request.getParameter("username");
 String password1 = request.getParameter("password");
     Class clazz = Class.forName("com.mysql.jdbc.Driver");
    // 2.提供另外三个连接的基本信息
    String url = "jdbc:mysql://localhost:3306/school";
    String user = "root";
    String password = "root";
    Connection conn = DriverManager.getConnection(url, user, password);
    PreparedStatement ps = conn.prepareStatement("select uname,upwd from user where uname = ? and upwd = ?");
    ps.setString(1, username);
    ps.setString(2, password1);
    ResultSet rs = ps.executeQuery();
    if(rs.next()){
         session.setAttribute("username", username);
         session.setAttribute("password", password1);
         response.sendRedirect("/school/success.jsp");
    }else{
        response.sendRedirect("/school/loginyanzheng2.jsp");
    }


 
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>

</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"
    import=" javax.servlet.http.HttpSession"
    %>
<!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>
</head>
<body>
<%
HttpSession s = request.getSession();
String username = s.getAttribute("username").toString();
String password = s.getAttribute("password").toString();

%>
    用户名 ： <%=username %><br/>
    密码  ： <%=password %>
</body>
</html>

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原文地址：https://www.cnblogs.com/M1223631418/p/14627127.html