第一种写法

实现ErrorPageRegistrar，404.html放在项目的webapp文件夹中

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@Configuration
public class ErrorPageConfig implements ErrorPageRegistrar {
 
    @Override
    public void registerErrorPages(ErrorPageRegistry registry) {
        ErrorPage[] errorPages = new ErrorPage[2];
        errorPages[0] = new ErrorPage(HttpStatus.NOT_FOUND, "/404.html");
        errorPages[1] = new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/500.html");
 
        registry.addErrorPages(errorPages);
    }
}

第二种写法

Spring Boot2.0 之后的写法，404.html文件放在resources的static文件夹中

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@Configuration
public class ErrorPageConfig {
    @Bean
    public WebServerFactoryCustomizer webServerFactoryCustomizer() {
        //第二种写法：java8 lambda写法
        return (factory -> {
            ErrorPage errorPage404 = new ErrorPage(HttpStatus.NOT_FOUND, "/404.html");
            factory.addErrorPages(errorPage404);
        });
 
    }
}