JSP - Java Server Pages

 1. 

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) 

throws ServletException, IOException {
    request.getRequestDispatcher("login.jsp").forward(request, response);
}

request.getRequestDispatcher("jsp sehifesinin adi").forward(request, response); - bu emeliyyat 

request ve responsu jsp sehifesine gonderir.

2. 

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    try {
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        User user = userService.findUserByUsernameAndPassword(username, password);
        request.getSession().setAttribute("loggedInUser", user);
        System.out.println(user);
    } catch (Exception e) {
        System.out.println("Some problem occurred");
    }
    response.sendRedirect("login.jsp");

}

response.sendRedirect("jsp sehifesinin adi"); bu emelliyyat sadece jsp sehifeye yoneldir

Dependency for JSTL

<dependency>
    <groupId>org.glassfish.web</groupId>
    <artifactId>javax.servlet.jsp.jstl</artifactId>
    <version>1.2.1</version>
    <exclusions>
        <exclusion>
            <artifactId>jstl-api</artifactId>
            <groupId>javax.servlet.jsp.jstl</groupId>
        </exclusion>
    </exclusions>
</dependency>