默认logout请求实现是有状态的，返回到login请求页面；我们现在是前后端分离处理，所以需要自定义实现logout

新建JwtLogoutSuccessHandler

/**
 * 自定义Logout处理
 * @author java1234_小锋 （公众号：java1234）
 * @site www.java1234.vip
 * @company 南通小锋网络科技有限公司
 */
@Component
public class JwtLogoutSuccessHandler implements LogoutSuccessHandler {
    @Override
    public void onLogoutSuccess(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Authentication authentication) throws IOException, ServletException {
        httpServletResponse.setContentType("application/json;charset=UTF-8");
        ServletOutputStream outputStream = httpServletResponse.getOutputStream();

        outputStream.write(JSONUtil.toJsonStr(R.ok("退出成功")).getBytes("UTF-8"));
        outputStream.flush();
        outputStream.close();
    }
}

SecurityConfig配置