Spring Boot学习--6 Web开发之Embedded Server Configuration

1. Server Substitute

Spring Boot自身支持Tomcat、Jetty、Undertow三种内置Server，默认Tomcat为内置服务器。可通过改变Maven dependency来替换Server。如要替换Tomcat为Jetty，maven pom部分代码如下：

<dependency
    <groupId>org.springframework.boot</groupId
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jetty</artifactId>
</dependency>

Server Configuration

Server配置可通过两种方式完成：
a、覆盖application.properties中以server作为prefix的属性的值来完成。
b、programming configuration，有两种形式。具体如下：
第一种形式：采用WebServerFactoryCustomizer接口访问ConfigurableServletWebServerFactory

package com.example.container;

import org.springframework.boot.web.server.ErrorPage;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.boot.web.servlet.server.ConfigurableServletWebServerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;

@Component
public class CustomServletContainer implements WebServerFactoryCustomizer<ConfigurableServletWebServerFactory>{

    @Override
    public void customize(ConfigurableServletWebServerFactory factory) {
        factory.setPort(9009);
        factory.setContextPath("/hello");
        factory.addErrorPages(new ErrorPage(HttpStatus.NOT_FOUND, "/404.html"));
    }

}

第二种形式：直接返回TomcatServletWebServerFactory等ServerFactory作为Bean

@Configuration
public class TomcatServletServerContainer {

    @Bean
    public ConfigurableServletWebServerFactory webServerFactory() {
        TomcatServletWebServerFactory webServerFactory = new TomcatServletWebServerFactory();
        webServerFactory.setPort(9010);
        webServerFactory.setContextPath("/welcome");
        webServerFactory.addErrorPages(new ErrorPage(HttpStatus.NOT_FOUND, "/404.html"));
        return webServerFactory;
    }
}

以上内容详见：
https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-developing-web-applications.html#boot-features-spring-mvc-static-content
文中“27.4.4 Customizing Embedded Servlet Containers”节。