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java web中主流的框架 ----jsp

2013-11-18 12:49 204 查看

只用jsp页面写的登陆和注册的例子

1,inc.jsp

<%@ page import="java.sql.Connection"%>
<%@ page import="java.sql.DriverManager"%>
<%@ page import="java.sql.Statement"%>
<%@ page import="java.sql.ResultSet"%>
<%@ page import="java.sql.ResultSetMetaData"%>
<%
String drv = "org.gjt.mm.mysql.Driver";
String url = "jdbc:mysql://localhost:3306/demo";//记得该自己的数据库名字
String usr = "root";//数据库的用户名
String pwd = "123456";//数据库的密码
%>

2，login.jsp

<%@ 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 'login.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>
<form name="form1" action="login_action.jsp" method="post">
<table width="200" border="1">
<tr>
<td colspan="2">登录窗口</td><!--合并两列-->
<tr>
<td>用户名</td>
<td><input type="text" name="username" size="10"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password" size="10"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="登录"> <a
href="register.jsp">注册新用户</a></td>
</tr>
</table>
</form>

</body>
</html>

3，login_action.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ include file="inc.jsp"%>
<%
//get parameters
String username = request.getParameter("username");
String password = request.getParameter("password");

//check null
if (username == null || password == null) {
response.sendRedirect("login.jsp");
}

//validate
boolean isValid = false;
String sql = "select * from user where username='"+username+"' and password='"+password+"'";
try {
Class.forName(drv).newInstance();
Connection conn = DriverManager.getConnection(url, usr, pwd);//取得连接
Statement stm = conn.createStatement();//执行对象
ResultSet rs = stm.executeQuery(sql);//返回结果集
if(rs.next())isValid = true;
rs.close();
stm.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
out.println(e);
} finally {
}

if (isValid) {
session.setAttribute("username", username);
response.sendRedirect("welcome.jsp");
} else {
response.sendRedirect("login.jsp");
}
%>

4,logout.jsp

<%
session.removeAttribute("username");
response.sendRedirect("login.jsp");
%>


5,register.jsp

<%@ 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 'register.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>
<form name="form1" action="register_action.jsp" method="post" >
<table width="200" border="1">
<tr>
<td colspan="2">注册窗口</td>
<tr>
<td>用户名</td>
<td><input type="text" name="username" size="10"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password1" size="10"></td>
</tr>
<tr>
<td>确认密码</td>
<td><input type="password" name="password2" size="10"></td>
</tr>
<tr>
<td>Email</td>
<td><input type="text" name="email" size="10"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="登录"> <a
href="login.jsp">返回</a></td>
</tr>
</table>
</form>

</body>
</html>


6,register_action.jsp

<%@ include file="inc.jsp"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
//get parameters
String username = request.getParameter("username");
String password1 = request.getParameter("password1");
String password2 = request.getParameter("password2");
String email = request.getParameter("email");

//check null
if (username == null || password1 == null || password2 == null || !password1.equals(password2)) {
response.sendRedirect("register.jsp");
}

//validate
boolean isValid = false;
String sql = "select * from user where username='"+username+"'";
try {
Class.forName(drv).newInstance();
Connection conn = DriverManager.getConnection(url, usr, pwd);
Statement stm = conn.createStatement();
ResultSet rs = stm.executeQuery(sql);//在这里可以加一点判断，如果用户名已经被注册，就返回一个值，或者注册成功返回一个值给前台页面接受，进行不同的页面展示
if(!rs.next()) {
sql = "insert into user(username,password,email) values('"+username+"','"+password1+"','"+email+"')";
stm.execute(sql);
isValid = true;
}

rs.close();
stm.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
out.println(e);
}

if (isValid) {
response.sendRedirect("login.jsp");
} else {
response.sendRedirect("register.jsp");
}

%>

7,welcome.jsp

<%@ 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>
<table width="100%">
<tr>
<td><img src="images/logo4.png"></td>
<td><img src="images/logo2.png" height="90"></td>
</tr>
<tr>
<td colspan="2">
<hr>
</td>
</tr>
<tr>
<td>
<table>
<tr>
<td><a href="welcome.jsp">Main</a></td>
</tr>
<tr>
<td><a href="menu1.jsp">Menu1</a></td>
</tr>
<tr>
<td><a href="menu2.jsp">Menu2</a></td>
</tr>
<tr>
<td><a href="menu3.jsp">Menu3</a></td>
</tr>
<tr>
<td><a href="menu4.jsp">Menu4</a></td>
</tr>
<tr>
<td><a href="menu5.jsp">Menu5</a></td>
</tr>
<tr>
<td><a href="menu6.jsp">Menu6</a></td>
</tr>
<tr>
<td><a href="menu7.jsp">Menu7</a></td>
</tr>
<tr>
<td><a href="menu8.jsp">Menu8</a></td>
</tr>
</table>
</td>
<td>
<form name="form1" action="logout.jsp" method="post">
<table width="200" border="1">
<tr>
<td colspan="2">登录成功</td>
<tr>
<td>欢迎你，</td>
<td><%=(String) session.getAttribute("username")%></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="退出"></td>
</tr>
</table>
</form>
</td>
</tr>
</table>

</body>
</html>
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