JSp+JDBC实现用户登录程序
2016-09-30 21:56
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1：登录页面
<!DOCTYPE html>
<html>
<head>
<title>登录页面</title>
<meta charset="GBK">
</head>
<body>
<center>
<h1>登录操作</h1>
<hr>
<form action="login_check.jsp" method="post">
<table border="1">
<tr>
<td clospan="2">用户登录</td>
</tr>
<tr>
<td>登录ID:</td>
<td><input type="text" name="id"></td>
</tr>
<tr>
<td>登录密码:</td>
<td><input type="password" name="password"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="登录"> <input
type="reset" value="重置"></td>
</tr>
</table>
</form>
</center>
</body>
</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+"/";
%>
2：表单验证
<html>
<head>
<title>表单验证</title>
</head>
<body>
<%!private static String driver = "com.mysql.jdbc.Driver";
private static String url = "jdbc:mysql://127.0.0.1:3306/mydatabase";
private static String username = "root";
private static String password = "123456";%>
<%
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
boolean flag = false;
String name = null;
%>
<%
try {
Class.forName(driver);
conn = DriverManager.getConnection(url, username, password);
String sql = "SELECT name FROM user WHERE userid=? AND password=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, request.getParameter("id"));
pstmt.setString(2, request.getParameter("password"));
rs = pstmt.executeQuery();
if (rs.next()) {
name = rs.getString(1);
flag = true;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
rs.close();
pstmt.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
%>
<%
if (flag) {
%>
<jsp:forward page="login_success.jsp">
<jsp:param name="uname" value="<%=name%>"/>
</jsp:forward>
<%
} else {
%>
<jsp:forward page="login_failure.html"/>
<%
}
%>
</body>
</html>
3：登录成功页
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>登录成功页</title>
</head>
<body>
<center>
<h1>登陆成功页面</h1>
<h1>登录操作</h1>
<h1>登陆成功</h1>
<h2>欢迎<font color="red"><%=request.getParameter("uname")%></font>光临!</h2>
</center>
</body>
</html>
4：登录失败，重新重新登录页面
<!DOCTYPE html>
<html>
<head>
<title>l登录失败，重新重新登录页面l</title>
<meta name="keywords" content="keyword1,keyword2,keyword3">
<meta name="description" content="this is my page">
<meta name="content-type" content="text/html; charset=UTF-8">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
</head>
<body>
<center>
<h1>登录操作</h1>
<h1>登录失败,请重新<a href="loginl.html">登录</a></h1>
</center>
<br>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>登录页面</title>
<meta charset="GBK">
</head>
<body>
<center>
<h1>登录操作</h1>
<hr>
<form action="login_check.jsp" method="post">
<table border="1">
<tr>
<td clospan="2">用户登录</td>
</tr>
<tr>
<td>登录ID:</td>
<td><input type="text" name="id"></td>
</tr>
<tr>
<td>登录密码:</td>
<td><input type="password" name="password"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="登录"> <input
type="reset" value="重置"></td>
</tr>
</table>
</form>
</center>
</body>
</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+"/";
%>
2：表单验证
<html>
<head>
<title>表单验证</title>
</head>
<body>
<%!private static String driver = "com.mysql.jdbc.Driver";
private static String url = "jdbc:mysql://127.0.0.1:3306/mydatabase";
private static String username = "root";
private static String password = "123456";%>
<%
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
boolean flag = false;
String name = null;
%>
<%
try {
Class.forName(driver);
conn = DriverManager.getConnection(url, username, password);
String sql = "SELECT name FROM user WHERE userid=? AND password=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, request.getParameter("id"));
pstmt.setString(2, request.getParameter("password"));
rs = pstmt.executeQuery();
if (rs.next()) {
name = rs.getString(1);
flag = true;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
rs.close();
pstmt.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
%>
<%
if (flag) {
%>
<jsp:forward page="login_success.jsp">
<jsp:param name="uname" value="<%=name%>"/>
</jsp:forward>
<%
} else {
%>
<jsp:forward page="login_failure.html"/>
<%
}
%>
</body>
</html>
3：登录成功页
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>登录成功页</title>
</head>
<body>
<center>
<h1>登陆成功页面</h1>
<h1>登录操作</h1>
<h1>登陆成功</h1>
<h2>欢迎<font color="red"><%=request.getParameter("uname")%></font>光临!</h2>
</center>
</body>
</html>
4：登录失败，重新重新登录页面
<!DOCTYPE html>
<html>
<head>
<title>l登录失败，重新重新登录页面l</title>
<meta name="keywords" content="keyword1,keyword2,keyword3">
<meta name="description" content="this is my page">
<meta name="content-type" content="text/html; charset=UTF-8">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
</head>
<body>
<center>
<h1>登录操作</h1>
<h1>登录失败,请重新<a href="loginl.html">登录</a></h1>
</center>
<br>
</body>
</html>
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