关于spring boot中 EmbeddedServletContainerCustomizer

EmbeddedServletContainerCustomizer（嵌入式servlet容器定制）这个在spring boot2.X的版本中就不再提供支持了貌似2.0版本还能用 ，用来提供对异常的处理,配置修改servlet。在支持EmbeddedServletContainerCustomizer的springboot版本中我们可以类似这样来配置异常处理和跳转

package com.dabai.springtest.error;

import org.springframework.boot.web.server.ErrorPage;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;

@Configuration
public class ErrorPageConfig {

    @Bean
    public EmbeddedServletContainerCustomizer containerCustomizer() {
        return new EmbeddedServletContainerCustomizer() {
            @Override
            public void customize(ConfigurableEmbeddedServletContainer container) {
                ErrorPage error401Page = new ErrorPage(HttpStatus.UNAUTHORIZED, "/401");
                ErrorPage error405Page = new ErrorPage(HttpStatus.METHOD_NOT_ALLOWED, "/405");
                ErrorPage error404Page = new ErrorPage(HttpStatus.NOT_FOUND, "/404");
                ErrorPage error500Page = new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/500");

                container.addErrorPages(error401Page,error405Page, error404Page, error500Page);
            }
        };
    }
}

在不支持的情况下需要这样

package com.dabai.springtest.error;

import org.springframework.boot.web.server.ErrorPage;
import org.springframework.boot.web.server.ErrorPageRegistrar;
import org.springframework.boot.web.server.ErrorPageRegistry;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;

@Component
public class ErrorPageConfig implements ErrorPageRegistrar {

    @Override
    public void registerErrorPages(ErrorPageRegistry registry) {
        ErrorPage error400Page=new ErrorPage(HttpStatus.BAD_REQUEST,"/error400" );
        ErrorPage error401Page=new ErrorPage(HttpStatus.UNAUTHORIZED,"/error401");
        ErrorPage error500Page=new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR,"/error500");
        registry.addErrorPages(error400Page,error401Page,error500Page);
    }

}

其中

ErrorPageRegistrar接口：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package org.springframework.boot.web.server;

@FunctionalInterface
public interface ErrorPageRegistrar {
    void registerErrorPages(ErrorPageRegistry registry);
}

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package org.springframework.boot.web.server;

@FunctionalInterface
public interface ErrorPageRegistry {
    void addErrorPages(ErrorPage... errorPages);
}

如果是在不支持EmbeddedServletContainerCustomizer的SpringBoot版本中希望制定容器的一些特性可以使用接口：WebServerFactoryCustomizer

package com.dabai.bishe.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.boot.web.servlet.server.ConfigurableServletWebServerFactory;
import org.springframework.context.annotation.Configuration;

import java.io.File;

//@Configuration
public class WebConfig {
    private static final Logger logger = LoggerFactory.getLogger(WebConfig.class);

    @Configuration
    public static class FrontEnd implements WebServerFactoryCustomizer<ConfigurableServletWebServerFactory> {
        @Value("${web.front.baseDir}")
        private File baseDir;

        @Override
        public void customize(ConfigurableServletWebServerFactory factory) {
            if (!baseDir.exists()) {
                if (!baseDir.mkdir()) {
                    logger.info("create web.front base path:" + baseDir + " failed!already exists!");
                } else {
                    logger.info("create web.front base path:" + baseDir + " success!");
                }
            }
            factory.setDocumentRoot(baseDir);
        }
    }
}