jsp+servlet登录框架模板

一、建立一个名叫jsp_servlet的工程

二、建立一个AcountBean类和CheckAccount类

1、AcountBean类包含登录名(username)和登录密码(password)

public class AcountBean {
    String username;
    String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

}

2、CheckAccount类继承HttpServlet

public class CheckAccount extends HttpServlet {

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }

    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession();
        AcountBean account = new AcountBean();
        String username = req.getParameter("username");
        String pwd = req.getParameter("pwd");
        account.setPassword(pwd);
        account.setUsername(username);
        System.out.println(username);
        System.out.println(pwd);
        if ((username != null) && (username.trim().equals("jsp"))) {
            if ((pwd != null) && (pwd.trim().equals("123"))) {
                System.out.println("success");
                session.setAttribute("account", account);
                String login_suc = "success.jsp";
                resp.sendRedirect(login_suc);
                return;
            }
        }
        String login_fail = "fail.jsp";
        resp.sendRedirect(login_fail);
        return;
    }

}

三、建立jsp界面

1、建立登录界面login.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>登录系统</title>
</head>
<body>
    <form action="login">
        username:<input type="text" name="username"><br>
        password:<input type="password" name="pwd"><br> <input
            type="submit">
    </form>

</body>
</html>

2、建立登录成功界面success.jsp

<%@page import="nsu.edu.student.AcountBean"%>
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>登录成功</title>
</head>
<body>
    <%
        AcountBean account = (AcountBean) session.getAttribute("account");
    %>
    username:<%=account.getUsername()%>
    <br> password:<%=account.getPassword()%>
</body>
</html>

3、建立登录失败界面fail.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>登录失败</title>
</head>
<body>
    Login Failed!
    <br>
</body>
</html>

四、配置web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">
    <display-name></display-name>

    <!-- 登录首页路径 -->
    <welcome-file-list>
        <welcome-file>login.jsp</welcome-file>
    </welcome-file-list>

    <!-- 点击登录后执行Java代码的路径 -->
    <servlet>
        <!-- 类名 -->
        <servlet-name>CheckAccount</servlet-name>
        <!-- 调用的类的位置 -->
        <servlet-class>nsu.edu.student.CheckAccount</servlet-class>

    </servlet>
     
     <!-- 元素在Servlet和URL样式之间定义一个映射-->
    <servlet-mapping>
        <servlet-name>CheckAccount</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping> 
    
</web-app>

posted on 2016-04-17 13:39 凌乱的笔记阅读(907) 评论(0) 编辑收藏举报