Spring token security with credential security (springboot)

I have a question regarding security implementation on my server. I am making a SpringBoot application which has a control panel like website on it, where 1 single admin inputs needed data and i have managed to secure that part fine like this :

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {




  @Override
  protected void configure(HttpSecurity http) throws Exception {


      http.antMatcher("/*").authorizeRequests().anyRequest().hasRole("ADMIN")
        .and().formLogin().loginPage("/login.jsp")
        .failureUrl("/login.jsp?error=1").loginProcessingUrl("/login")
        .permitAll().and().logout()
        .logoutSuccessUrl("/login.jsp");

  }

  @Override
  protected void configure(AuthenticationManagerBuilder auth) throws Exception {
    // Create a default account
    auth.inMemoryAuthentication()
        .withUser("admin")
        .password("admin")
        .roles("ADMIN");
  }

Every website url is on /*, and that works fine. The next thing i need to do is to retrieve data from my mobile app and it needs to be secure. urls that the app should use is /rest/**. I have a Student class that stores email(username) and password that is created by that admin on web site. As far as i've read i need token implementation.

How can I implement token authentication?