허니몬(Honeymon)의 자바guru

public interface AuthenticationFailureHandler {
 
	/**
	 * Called when an authentication attempt fails.
	 * @param request the request during which the authentication attempt occurred.
	 * @param response the response.
	 * @param exception the exception which was thrown to reject the authentication
	 * request.
	 */
	void onAuthenticationFailure(HttpServletRequest request,
			HttpServletResponse response, AuthenticationException exception)
			throws IOException, ServletException;
}

@Override
protected void configure(HttpSecurity http) throws Exception {
    http
        .anyRequest().authenticated()
        // form 로그인 
        .and()
        .formLogin()
        .loginPage("/login").permitAll()
        .usernameParameter(USERNAME_PARAMETER)
        .passwordParameter(PASSWORD_PARAMETER)
        .successHandler(authenticationSuccessHandler()) (1)
        .failureHandler(authenticationFailureHandler()) (2)
}
 
// 생략 
@Bean
AuthenticationSuccessHandler authenticationSuccessHandler() {
    return new HoneymonUserAuthenticationSuccessHandler();
}
 
@Bean
AuthenticationFailureHandler authenticationFailureHandler() {
    return new HoneymonUserAuthenticationFailureHandler();
}

public class HoneymonUserAuthenticationFailureHandler implements AuthenticationFailureHandler {
 
    @Override
    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response, AuthenticationException exception) throws IOException, ServletException {
        if(exception instanceof BadCredentialsException) {
            exception = new BadCredentialsException("security.exception.bad_credentials");
        }
        response.sendRedirect("/login?error=" + exception.getMessage() + "&email=" + request.getParameter(USERNAME_PARAMETER));
    }
}

@Configuration
public class WebConfig  extends WebMvcConfigurerAdapter {
  @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/login").setViewName("front/login");  // 로그인 
        registry.addViewController("/signup").setViewName("front/signup");  // 회원가입 
    }
}