spring security设置login的ajax返回

public class UnauthorizedEntryPoint implements AuthenticationEntryPoint {
    @Override
    public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException) throws IOException, ServletException {
        if(isAjaxRequest(request)){
            response.sendError(HttpServletResponse.SC_UNAUTHORIZED,authException.getMessage());
        }else{
            response.sendRedirect("/login");
        }

    }

    public static boolean isAjaxRequest(HttpServletRequest request) {
        String ajaxFlag = request.getHeader("X-Requested-With");
        return ajaxFlag != null && "XMLHttpRequest".equals(ajaxFlag);
    }
}

@Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                .exceptionHandling().authenticationEntryPoint(new UnauthorizedEntryPoint())
                .and()
                .csrf().disable()
                .authorizeRequests()
                .antMatchers("/css/**", "/js/**","/fonts/**").permitAll()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .loginPage("/login")
                .permitAll()
                .and()
                .logout()
                .logoutUrl("/logout")
                .permitAll();
    }