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java web module of login

2015-12-02 20:48 411 查看

Reffer to the book<java web整合开发王者归来>.

It's jsp page.

Offer the values of username and password to servlet.

Then save the session.

The code is simple.

easy to read.

Except the myLogin.jsp,also need a javabean Person.java.

<%@ page language="java" pageEncoding="UTF-8"%>
<jsp:directive.page import="com.helloweenvsfei.sessionWeb.bean.Person" />
<jsp:directive.page import="java.text.SimpleDateFormat" />
<jsp:directive.page import="java.text.DateFormat" />
<jsp:directive.page import="java.util.Date" />
<%!
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
%>
<%
response.setCharacterEncoding("UTF-8");

Person[] persons = {
new Person("linghuchong", "linghuchong", 34, dateFormat.parse("1982-01-01")),
new Person("Hello Kitty", "hellokitty", 23, dateFormat.parse("1984-02-25")),
new Person("renyingying", "renyingying", 23, dateFormat.parse("1994-09-12")),
};

String message = "";

if(request.getMethod().equals("POST"))
{
for(Person person : persons)
{
if(person.getName().equalsIgnoreCase(request.getParameter("username"))
&& person.getPassword().equals(request.getParameter("password")))
{
session.setAttribute("person", person);
session.setAttribute("loginTime", new Date());
response.sendRedirect(request.getContextPath() + "/welcome.jsp");
return;
}
}
// login failed
message = "wrong username or pwd,login failed";
}
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Please login first</title>
</head>
<body>
<form action="myLogin.jsp" method="post">
<table>
<% if( ! message.equals("")){ %>
<tr>
<td></td>
<td>login failed!</td>
</tr>
<% } %>
<tr>
<td>username:</td>
<td><input type="text" name="username" style="width:200px; ">
</td>
</tr>
<td>password:</td>
<td><input type="password" name="password" style="width:200px; ">
</td>
<tr>
<td></td>
<td><input type="submit" value=" Login " class="button">
</td>
</tr>
</table>
</form>
Hello Kitty, hellokitty
</body>
</html>

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