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 contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
</head>
<body>
<%
String name = (String) request.getSession().getAttribute("uname");
%>
<body style="background:url(images/1.jpg)">
<div class="contentArea">
<h1 style="color: red">欢迎<%=name%>登陆!</h1>
<html>
<head>
</head>
<body>
<%
String name = (String) request.getSession().getAttribute("uname");
%>
<body style="background:url(images/1.jpg)">
<div class="contentArea">
<h1 style="color: red">欢迎<%=name%>登陆!</h1>
</html>
<%@page import="java.nio.channels.SeekableByteChannel"%>
<%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*"%>
<html>
<head>
<title>www.school.com</title>
</head>
<body>
<%!public static final String DBDRIVER = "com.mysql.jdbc.Driver";
public static final String DBURL = "jdbc:mysql://localhost:3306/jspwork";
public static final String DBUSER = "root";
public static final String DBPASS = "root";%>
<%
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
boolean flag = false;
String name = null;
%>
<%
try {
Class.forName(DBDRIVER);
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
String sql = "SELECT uname FROM num_one WHERE uid=? AND upwd=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, request.getParameter("uid"));
pstmt.setString(2, request.getParameter("upwd"));
rs = pstmt.executeQuery();
if (rs.next()) {
name = rs.getString(1);
flag = true;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (rs != null)
rs.close();
if (pstmt != null)
pstmt.close();
if (conn != null)
conn.close();
if (flag) {
request.getSession().setAttribute("uname",name);
request.getRequestDispatcher("welcome.jsp").forward(request,response);
} else {
response.sendRedirect("no.jsp");
}
} catch (Exception e) {
e.printStackTrace();
}
}
%>
</body>
</html>
<%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*"%>
<html>
<head>
<title>www.school.com</title>
</head>
<body>
<%!public static final String DBDRIVER = "com.mysql.jdbc.Driver";
public static final String DBURL = "jdbc:mysql://localhost:3306/jspwork";
public static final String DBUSER = "root";
public static final String DBPASS = "root";%>
<%
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
boolean flag = false;
String name = null;
%>
<%
try {
Class.forName(DBDRIVER);
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
String sql = "SELECT uname FROM num_one WHERE uid=? AND upwd=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, request.getParameter("uid"));
pstmt.setString(2, request.getParameter("upwd"));
rs = pstmt.executeQuery();
if (rs.next()) {
name = rs.getString(1);
flag = true;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (rs != null)
rs.close();
if (pstmt != null)
pstmt.close();
if (conn != null)
conn.close();
if (flag) {
request.getSession().setAttribute("uname",name);
request.getRequestDispatcher("welcome.jsp").forward(request,response);
} else {
response.sendRedirect("no.jsp");
}
} catch (Exception e) {
e.printStackTrace();
}
}
%>
</body>
</html>