// DeltaServlet.java
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import delta.core.servlet.DeltaServlet;
public class LoginServlet extends DeltaServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) {
renderView("/login.jsp", request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) {
String username = request.getParameter("username");
String password = request.getParameter("password");
boolean isValidUser = userService.validateUser(username, password);
if (isValidUser) {
request.setAttribute("username", username);
renderView("/welcome.jsp", request, response);
} else {
renderView("/error.jsp", request, response);
}
}
}
// login.jsp
<html>
<head>
<title>Login</title>
</head>
<body>
<form method="post">
<input type="text" name="username" placeholder="Username"/>
<input type="password" name="password" placeholder="Password"/>
<input type="submit" value="Login"/>
</form>
</body>
</html>
// welcome.jsp
<html>
<head>
<title>Welcome</title>
</head>
<body>
<h2>Welcome, ${username}!</h2>
</body>
</html>
// error.jsp
<html>
<head>
<title>Error</title>
</head>
<body>
<h2>Invalid username or password</h2>
</body>
</html>
