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单java+2jsp页面实现登录验证

2012-03-25 22:04 459 查看

////////////////////Check.java

import java.io.IOException;

import java.io.PrintWriter;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class Check extends HttpServlet{

private Map<String, String> usermap;

public Check()

{

usermap=new HashMap<String, String>();

usermap.put("caterpillar","Hello");

usermap.put("Justin","welcome");

usermap.put("momor", "Hi");

usermap.put("宏", "123");

usermap.put("hong", "456");

}

@Override

protected void doPost(HttpServletRequest request, HttpServletResponse response )throws ServletException, IOException

{

request.setCharacterEncoding("UTF-8");

String name=request.getParameter("user");

String password=request.getParameter("password");

if( password.equals(usermap.get(name)) )

{

//response.sendRedirect("jieguo.jsp");

request.setAttribute("message", "logining.....");

request.getRequestDispatcher("jieguo.jsp").forward(request, response);

}

else

{

//request.setAttribute("user", name);

request.setAttribute("message", "sorry 登陆失败");

request.getRequestDispatcher("jieguo.jsp").forward(request, response);

}

//request.getRequestDispatcher("login.jsp").forward(request, response);

}

}

///////////////////////////////////////////////////////////////////////////////////////////////////

//////////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">



</head>

<body>

<form action="Check.do" method="post">

用户名<input type="text" name="user"><br>

密码<input type="password" name="password"><br>

<input type="submit" value="登陆">

</form>

<br>

</body>

</html>

///////////////////jiegou.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 'jieguo.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">



</head>

<body>

${param.user} ${message} <br>

</body>

</html>

////////////////////////////////////web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4"

xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>

<servlet-name>Check</servlet-name>

<servlet-class>Check</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>Check</servlet-name>

<url-pattern>/Check.do</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>login.jsp</welcome-file>

</welcome-file-list>

</web-app>

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