Java Web pure JSP way to realize user login function

1. Realize user login function in pure JSP mode

(1) Implementation ideas

The login page login.jsp, after entering the user name and password, jumps to the login processing page doLogin.jsp for business logic processing, if the login is successful, jumps to the login success page success.jsp, otherwise jumps to the login failure page failure.jsp.

(2) Implementation steps

1. Create a Web project

start by creatingJava Enterpriseitem, addWeb ApplicationFunction

insert image description here

Set the project name to LoginDemo, and set the save location
Click the [Finish] button
In the project structure window, modify the Artifact name - LoginDemo01, and delete the suffix
Edit the server configuration, redeploy the project
First the [Server] tab
Then switch to the [Deployment] tab

2. Create a login page

Create a login page −login.jsp
code show as below

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>用户登录</title>
</head>
<body>
<h3 style="text-align: center">用户登录</h3>
<form action="doLogin.jsp" method="post">
    <table border="1" cellpadding="10" style="margin: 0px auto">
        <tr>
            <td align="center">账号</td>
            <td><input type="text" name="username"/></td>
        </tr>
        <tr>
            <td align="center">密码</td>
            <td><input type="password" name="password"/></td>
        </tr>
        <tr align="center">
            <td colspan="2">
                <input type="submit" value="登录"/>
                <input type="reset" value="重置"/>
            </td>
        </tr>
    </table>
</form>
</body>
</html>

3. Create a login processing page

Create login processing page −doLogin.jsp
code show as below

<%
    // 获取登录表单数据
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    // 判断登录是否成功
    if (username.equals("无心剑") && password.equals("903213")) {
    
    
        // 跳转到登录成功页面，传递用户名
        response.sendRedirect("success.jsp?username=" + username);
    } else {
    
    
        // 跳转到登录失败页面，传递用户名
        response.sendRedirect("failure.jsp?username=" + username);
    }
%>

4. Create a successful login page

Login success page -success.jsp
code show as below

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录成功</title>
</head>
<body>
<h3 style="text-align: center">恭喜，<%=request.getParameter("username")%>，登录成功！</h3>
</body>
</html>

5. Create a login failure page

Create login failure page −failure.jsp
code show as below

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录成功</title>
</head>
<body>
<h3 style="text-align: center">恭喜，<%=request.getParameter("username")%>，登录成功！</h3>
</body>
</html>

6. Edit the project home page

Project Home -index.jsp
code show as below

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>用户登录</title>
</head>
<body>
<h3 style="text-align: center">用户登录</h3>
<form action="doLogin.jsp" method="post">
    <table border="1" cellpadding="10" style="margin: 0px auto">
        <tr>
            <td align="center">账号</td>
            <td><input type="text" name="username"/></td>
        </tr>
        <tr>
            <td align="center">密码</td>
            <td><input type="password" name="password"/></td>
        </tr>
        <tr align="center">
            <td colspan="2">
                <input type="submit" value="登录"/>
                <input type="reset" value="重置"/>
            </td>
        </tr>
    </table>
</form>
</body>
</html>