两个项目java项目实现登录统一代码
时间: 2023-10-08 10:08:54 浏览: 42
以下是一个简单的 Java Web 项目实现登录的统一代码:
1. 创建一个名为 "LoginServlet" 的 Servlet 类,实现用户登录的逻辑:
```java
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
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("admin")) {
HttpSession session = request.getSession();
session.setAttribute("username", username);
response.sendRedirect("welcome.jsp");
} else {
response.sendRedirect("login.jsp");
}
}
}
```
2. 创建一个名为 "login.jsp" 的 JSP 页面,提供一个登录表单:
```jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login Page</title>
</head>
<body>
<form action="LoginServlet" method="post">
<label for="username">Username:</label>
<input type="text" id="username" name="username"><br><br>
<label for="password">Password:</label>
<input type="password" id="password" name="password"><br><br>
<input type="submit" value="Login">
</form>
</body>
</html>
```
3. 创建一个名为 "welcome.jsp" 的 JSP 页面,用于显示欢迎信息:
```jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Welcome Page</title>
</head>
<body>
<h1>Welcome <%= session.getAttribute("username") %>!</h1>
<a href="logout.jsp">Logout</a>
</body>
</html>
```
4. 创建一个名为 "logout.jsp" 的 JSP 页面,用于注销登录:
```jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Logout Page</title>
</head>
<body>
<h1>You have been logged out!</h1>
<a href="login.jsp">Login Again</a>
</body>
</html>
```
以上就是一个简单的 Java Web 项目实现登录的统一代码。在实际项目中,可能需要根据具体的需求进行修改和完善。
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