以下是实现简单登录注册功能的代码示例。
User.java (实体类):
public class User {
private String username;
private String password;
// 构造函数、getter和setter省略
}
UserDAO.java (数据访问对象):
public class UserDAO {
public boolean isUserValid(String username, String password) {
// 连接数据库并验证用户凭据
// 返回true如果用户有效
}
public boolean registerUser(User user) {
// 连接数据库并注册新用户
// 返回true如果注册成功
}
}
LoginServlet.java (处理登录请求):
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
UserDAO userDAO = new UserDAO();
if (userDAO.isUserValid(username, password)) {
// 登录成功，重定向到主页或其他页面
} else {
// 登录失败，返回错误信息或重定向到登录页面
}
}
}
RegisterServlet.java (处理注册请求):
@WebServlet("/register")
public class RegisterServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
User user = new User();
user.setUsername(username);
user.setPassword(password);
UserDAO userDAO = new UserDAO();
if (userDAO.registerUser(user)) {
// 注册成功，重定向到登录页面
} else {
// 注册失败，返回错误信息或重定向到注册页面
}
}
}
login.jsp (登录页面):
<form action="login" method="post">
用户名: <input type="text" name="username" /><br />
密码: <input type="password" name="password" /><br />
<input type="submit" value="登录" />
</form>
register.jsp (注册页面):
<form action="register" method="post">
用户名: <input type="text" name="username" /><br />
密码: <input type="password" name="password" /><br />
<input type="submit" value="