Display user name in Spring - spring

Question

I can login and logout, and display a list of users on a page doing this:
<li th:each="user : ${users}">
<span th:text="${user.firstname}+' '+${user.lastname}"></span>
</li>
I would now simply like to display the name of the currently logged in user, but I am not sure how. I would like to add it to a header fragment so every page shows clearly who the user logged in is.
LoginForm.java:
package com.demo.spring.domain;
import org.hibernate.validator.constraints.NotEmpty;
public class LoginForm {
public String getAccountname() {
return accountname;
}
public void setAccountname(String accountname) {
this.accountname = accountname;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
#NotEmpty
String accountname;
#NotEmpty
String password;
}
login.html:
<h3>User Login</h3>
<form action="#" th:action="#{/user/login}" th:object="${user}" method="post">
<!--<input type="hidden" th:field="*{id}"/>-->
<p>Account Name:</p> <input type="text" th:field="*{accountname}"/>
<p>Password:</p> <input type="password" th:field="*{password}"/>
<p/><input type="submit" value="Login"/>
</form>
<div th:if="${message!=null}">
<br/>
<span th:text="${message}"/>
</div>
UserController code for logging in:
package com.demo.spring.controller;
import com.demo.spring.domain.LoginForm;
import com.demo.spring.domain.User;
import com.demo.spring.domain.UserSearchForm;
import com.demo.spring.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.List;
#Controller
#RequestMapping(value = "/user")
public class UserController {
#Autowired
UserService userService;
#RequestMapping(value = "/login", method = RequestMethod.GET)
public String loginView(Model model)
{
LoginForm user = new LoginForm();
model.addAttribute("user", user);
return "login";
}
#RequestMapping(value = "/login", method = RequestMethod.POST)
public String login(Model model, #Valid #ModelAttribute("user") LoginForm user, BindingResult bindingResult, HttpSession session)
{
if(bindingResult.hasErrors())
{
model.addAttribute("user", user);
model.addAttribute("message", "Please provide information in each field");
return "login";
}
if (userService.validateLogin(user)==false)
{
model.addAttribute("user", user);
model.addAttribute("message", "Your accountname and/or password are incorrect");
return "login";
}
session.setAttribute("login", true);
return "redirect:/";
}
UserService
package com.demo.spring.service;
import com.demo.spring.domain.LoginForm;
import com.demo.spring.domain.UserSearchForm;
import com.demo.spring.domain.User;
import com.demo.spring.domain.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
#Service
public class UserService {
public boolean validateLogin(LoginForm user)
{
List<User> users = userRepository.checkUserInput(user.getAccountname(),user.getPassword());
return users !=null && users.size()>0;
}

Answer 1

We put the logged in users' name in the session
#RequestMapping(value = "/login", method = RequestMethod.POST)
public String login(Model model, #Valid #ModelAttribute("user") LoginForm user, BindingResult bindingResult, HttpSession session)
{
...
session.setAttribute("accountName", user.getAccountName());
session.setAttribute("login", true);
return "redirect:/";
}
Once put in the session, the session variables can simply be accessed as ${session.accountName}. So you can use <span th:text="${session.accountName}"></span> in your header fragment.