springmvc 注册错误页

@Bean
public ErrorPageRegistrar errorPageRegistrar(){
	return new MyErrorPageRegistrar();
}

// ...

private static class MyErrorPageRegistrar implements ErrorPageRegistrar {

	@Override
	public void registerErrorPages(ErrorPageRegistry registry) {
		registry.addErrorPages(new ErrorPage(HttpStatus.BAD_REQUEST, "/400"));
	}

}

https://docs.spring.io/spring-boot/docs/2.0.9.RELEASE/reference/htmlsingle/#boot-features-error-handling