Java RequestDispatcher重定向无法正常工作

Question

我正在尝试使用RequestDispatcher从servlet重定向页面，但它无法正常工作。我的servlet代码是这样的：

public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
List<User> users = new LinkedList<User>();

/**
 * @see HttpServlet#HttpServlet()
 */
public LoginServlet() throws FileNotFoundException, IOException{
    super();
    File file = new File("C:/Users/Misel/workspace/SalonNamestaja/src/org/SalonNamestaja/dataFiles/users.txt");
    FileReader fileReader = new FileReader(file);
    BufferedReader bufferedReader = new BufferedReader(fileReader);
    String line;
    String[] parts;

    while((line = bufferedReader.readLine()) != null) {
        parts = line.split("\\|");
        users.add(new User(parts[1], parts[2], parts[0], parts[4], parts[3], parts[5], parts[6]));
    }
    fileReader.close();
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("text/text");
    response.setCharacterEncoding("UTF-8");
    String json = request.getParameter("jsonData");

    ObjectMapper mapper = new ObjectMapper();
    User user = mapper.readValue(json, User.class);
    //System.out.println(user.getName() + user.getPassword() + " | " + user.getLevel());

    if(user.getLevel().equals("korisnik")) {
        user = new LoginService().authenticate(users, user.getName(), user.getPassword());
        //System.out.println("Postoji korisnik");
        HttpSession session = request.getSession();
        session.setAttribute("activeUser", user);

        //response.getWriter().write("true");

        RequestDispatcher requestDispatcher = request.getRequestDispatcher("/dashboard.jsp");
        requestDispatcher.forward(request, response);
        //System.out.println("OK");
        return;
    }else if(user.getLevel().equals("admin")) { 
        user = new LoginService().authenticate_admin(users, user.getName(), user.getPassword());
        System.out.println("Postoji admin");
        HttpSession session = request.getSession();
        session.setAttribute("activeUser", user);

        response.getWriter().write("true");
        return;
    }else {
        System.out.println("Korisnik ne postoji!");
        response.getWriter().write("false");
    }
}

我尝试使用sendRedirect（）重定向，但这也不起作用。我找不到问题所在，所以如果有人可以帮助我。