Question

我在Intellij中使用Play Framework 2.5.x，我不太熟悉，我需要在请求失败后显示错误消息页面。目前，当我输入错误的凭据时，页面将重新加载而不显示错误。我只需要一种简单的方法来显示错误。

如果用户输入其凭据，则if语句将评估是否存在表单错误。如果是，请再次显示表单，否则处理提交。

if (response.hasErrors()) {
      return ok(create.render(createViewModelForm));
        }

这是ui \ views \ sessions

中的createForm.html

@(gcreateForm: Form[femr.ui.models.sessions.CreateViewModel], errorMessage: java.lang.String)

@import femr.ui.views.html.layouts.main
@import femr.ui.controllers.routes.SessionsController
    @styles = {
        <link rel="stylesheet" href="@routes.Assets.versioned("css/login.css")">
    }
@main("Login", styles = styles) {

    @helper.form(action = SessionsController.createPost(), 'class -> "form-signin") {
        <div id="login">
            <h1>Please sign in</h1>
            <input type="text" name="email" placeholder="Email" />
            <input type="password" name="password" placeholder="Password" />
            <input type="submit" value="Log in" />
            <img src="@routes.Assets.versioned("img/logo_color_sm.png")" />
        </div>
    }
}

这是ui \ views \ sessions

中的createForm

package femr.ui.controllers;

import com.google.inject.Inject;
import femr.business.services.core.ISessionService;
import femr.business.services.core.IUserService;
import femr.common.dtos.CurrentUser;
import femr.common.dtos.ServiceResponse;
import femr.data.models.core.IUser;
import femr.ui.models.sessions.CreateViewModel;
import femr.ui.views.html.sessions.create;
import femr.ui.views.html.sessions.editPassword;
import femr.util.calculations.dateUtils;
import femr.util.stringhelpers.StringUtils;
import org.joda.time.DateTime;
import org.joda.time.Days;
import play.data.Form;
import play.data.FormFactory;
import play.mvc.Controller;
import play.mvc.Result;

import java.util.ArrayList;
import java.util.regex.Pattern;

public class SessionsController extends Controller {

    private final FormFactory formFactory;
    private final ISessionService sessionsService;
    private final IUserService userService;

    @Inject
    public SessionsController(FormFactory formFactory, ISessionService sessionsService, IUserService userService) {

        this.formFactory = formFactory;
        this.sessionsService = sessionsService;
        this.userService = userService;
    }

    public Result createGet() {
        CurrentUser currentUser = sessionsService.retrieveCurrentUserSession();

        final Form<CreateViewModel> createViewModelForm = formFactory.form(CreateViewModel.class);

        if (currentUser != null) {
            return redirect(routes.HomeController.index());
        }

        return ok(create.render(createViewModelForm));
    }

    public Result createPost() {

        final Form<CreateViewModel> createViewModelForm = formFactory.form(CreateViewModel.class);
        CreateViewModel viewModel = createViewModelForm.bindFromRequest().get();
        ServiceResponse<CurrentUser> response = sessionsService.createSession(viewModel.getEmail(), viewModel.getPassword(), request().remoteAddress());

        if (response.hasErrors()) {
            return ok(create.render(createViewModelForm));
        }else{
            IUser user = userService.retrieveById(response.getResponseObject().getId());
            user.setLastLogin(dateUtils.getCurrentDateTime());
            ServiceResponse<IUser> userResponse = userService.update(user, false);
            if (userResponse.hasErrors()){
                throw new RuntimeException();
            }

            DateTime start = new DateTime(user.getPasswordCreatedDate());
            DateTime stop = new DateTime(DateTime.now());
            int daysBetween = Days.daysBetween(start, stop).getDays();

            if(daysBetween > 60){
                user.setPasswordReset(true);
            }

            if (user.getPasswordReset() == true){
                return editPasswordGet(user);
            }
        }

        return redirect(routes.HomeController.index());

    }

    public Result editPasswordGet(IUser user){

        final Form<CreateViewModel> createViewModelForm = formFactory.form(CreateViewModel.class);

        return ok(editPassword.render(user.getFirstName(), user.getLastName(), createViewModelForm, new ArrayList<String>()));
    }

    public Result editPasswordPost(){

        final Form<CreateViewModel> createViewModelForm = formFactory.form(CreateViewModel.class);
        CreateViewModel viewModel = createViewModelForm.bindFromRequest().get();
        CurrentUser currentUser = sessionsService.retrieveCurrentUserSession();
        IUser user = userService.retrieveById(currentUser.getId());
        Boolean isNewPassword = false;

        Pattern hasUppercase = Pattern.compile("[A-Z]");
        Pattern hasNumber = Pattern.compile("\\d");
        ArrayList<String> messages = new ArrayList<>();
        if (StringUtils.isNullOrWhiteSpace(viewModel.getNewPassword()))
            messages.add("password is a required field");
        else
        {
            if(viewModel.getNewPassword().length() < 6)        //AJ Saclayan Password Constraints
                messages.add("password is less than 6 characters");
            if (!hasUppercase.matcher(viewModel.getNewPassword()).find())
                    messages.add("password must have an uppercase");
            if (!hasNumber.matcher(viewModel.getNewPassword()).find())
                    messages.add("password must have a number");
            if(!viewModel.getNewPassword().equals(viewModel.getNewPasswordVerify()))
                messages.add("passwords do not match");
            //check if new password is equal to the old password
            if(userService.checkOldPassword(viewModel.getNewPassword(),userService.retrieveById(currentUser.getId()).getPassword()))
                messages.add("password must not be the same one used before reset");


        }

        if(!messages.isEmpty())
            return ok(editPassword.render(user.getFirstName(), user.getLastName(), createViewModelForm, messages));
        else
        {
            user.setPassword(viewModel.getNewPassword());
            user.setPasswordCreatedDate(DateTime.now());
            user.setPasswordReset(false);
            isNewPassword = true;
        }

        ServiceResponse<IUser> userResponse = userService.update(user, isNewPassword);
        if (userResponse.hasErrors()){
            throw new RuntimeException();
        }
        return redirect(routes.HomeController.index());
    }

    public Result delete() {
        sessionsService.invalidateCurrentUserSession();

        return redirect(routes.HomeController.index());
    }
}

Answer 1

您可以使用Flash scope轻松显示用户反馈。正如documentation所述，数据仅保留一个请求，这符合您在发生错误时呈现错误消息的要求。

例如：

public static Result yourAction() {
    // Oh snap! Error occurred... 
    flash("error", "Invalid credentials.");
    return redirect("/your-action");
}

然后在你的Twirl模板中：

@(request: RequestHeader)

@request.flash.get("error").map { msg =>
<div class="alert alert-danger alert-error">
    <strong>Error!</strong> @msg
</div>
}

如果登录失败，如何在登录页面中显示消息

1 个答案: