Java Server Programming Black Book Pdf May 2026

public static Connection getConnection() throws SQLException return dataSource.getConnection();

// 5. Filter for Authentication @WebFilter("/*") public class AuthFilter implements Filter java server programming black book pdf

HttpSession session = req.getSession(); String username = req.getParameter("username"); String password = req.getParameter("password"); if (authenticate(username, password)) session.setAttribute("user", username); session.setMaxInactiveInterval(1800); // 30 minutes resp.sendRedirect("dashboard.jsp"); else resp.sendRedirect("login.html?error=true"); String username = req.getParameter("username")

// 3. Database Connection Pool public class DatabasePool private static HikariDataSource dataSource; String password = req.getParameter("password")

@POST @Consumes(MediaType.APPLICATION_JSON) @Produces(MediaType.APPLICATION_JSON) public Response createUser(User user) userService.save(user); return Response.status(Response.Status.CREATED).entity(user).build();

// 1. Simple Servlet @WebServlet("/hello") public class HelloServlet extends HttpServlet protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException resp.setContentType("text/html"); PrintWriter out = resp.getWriter(); out.println("<h1>Hello from Java Server!</h1>"); out.println("Time: " + new java.util.Date());

// 2. Servlet with Session Management @WebServlet("/login") public class LoginServlet extends HttpServlet protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException