javaweb登录页面
时间: 2023-08-09 14:05:16 浏览: 45
JavaWeb 的登录页面通常需要以下步骤:
1. 创建一个登录页面,包含用户名和密码的输入框,以及一个提交按钮。
2. 创建一个后端处理程序,用于接收登录页面提交的用户名和密码,并进行验证。
3. 如果用户名和密码正确,则保存用户登录状态,并跳转到登录成功页面;如果不正确,则返回登录页面并提示错误信息。
4. 登录成功页面应该可以展示用户的相关信息,以及退出登录的按钮。
下面是一个简单的示例代码:
login.jsp:
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login Page</title>
</head>
<body>
<h2>Login Page</h2>
<form method="post" action="loginServlet">
<label>Username:</label>
<input type="text" name="username"><br>
<label>Password:</label>
<input type="password" name="password"><br>
<input type="submit" value="Login">
</form>
</body>
</html>
```
loginServlet.java:
```java
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
if (username.equals("admin") && password.equals("admin123")) {
HttpSession session = request.getSession();
session.setAttribute("username", username);
response.sendRedirect("success.jsp");
} else {
response.sendRedirect("login.jsp?error=1");
}
}
}
```
success.jsp:
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login Success</title>
</head>
<body>
<h2>Login Success</h2>
<p>Welcome <%= session.getAttribute("username") %>!</p>
<a href="logoutServlet">Logout</a>
</body>
</html>
```
logoutServlet.java:
```java
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@WebServlet("/logoutServlet")
public class LogoutServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession();
session.invalidate();
response.sendRedirect("login.jsp");
}
}
```