1.嵌入式Servlet容器配置修改

- 1.通过全局配置文件修改
  - 可以通过server.xxx 来进行web服务配置，没有带服务器名称的则是通用配置
  - 通过带了具体的服务器名称则是单独对该服务器进行设置，比如 server.tomcat.xxx 就是专门针对tomcat的配置

- 2.通过WebServerFactoryCustomizer的Bean修改
  - 修改server.xxx 配置的相关内容
  - 会跟配置文件形成互补

@Component
public class CustomizationBean implements WebServerFactoryCustomizer<ConfigurableServletWebServerFactory> {
    @Override
    public void customize(ConfigurableServletWebServerFactory factory) {
        factory.setContextPath("/abc");
    }
}

2.注册servlet三大组件 servlet listener filter

方式一：servlet3.0规范提供的注解方式注册需要使用 @ServletComponentScan 扫描才能生效

- 　　@WebServlet
- 　　@WebListener
- 　　@WebFilter

@WebServlet(name="HelloServlet",urlPatterns = "/HelloServlet")
//@WebFilter 使用方式相似
//@WebListener 使用方式相似
public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter writer = resp.getWriter();
        writer.println("hello world 3333");
    }
}

@SpringBootApplication
@ServletComponentScan
public class SpringbootservletApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootservletApplication.class, args);
    }
}

方式二：springboot 方式

public class BeanServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter writer = resp.getWriter();
        writer.println("hello BeanServlet!");
    }
}

@Configuration
public class SpringBootServlet {
    /**
     * SpringBoot提供的注册:
     *         ServletRegistrationBean
     *         FilterRegistrationBean
     *         ServletListenerRegistrationBean
     */
    @Bean
    public ServletRegistrationBean myServlet(){
        ServletRegistrationBean<Servlet> servletServletRegistrationBean = new ServletRegistrationBean<>();
        servletServletRegistrationBean.setServlet(new BeanServlet());
        servletServletRegistrationBean.setName("BeanServlet");
        servletServletRegistrationBean.addUrlMappings("/BeanServlet");
        return servletServletRegistrationBean;
    }
}

3.切换其他嵌入式Servlet容器

Spring Boot包含对嵌入式Tomcat，Jetty和Undertow服务器的支持
tomcat（默认）
Jetty(socket)
Undertow(响应式)

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!--1.排除tomcat 要想使用jetty 或者 undertow 必须排除tomcat-->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!--2.依赖jetty
        <dependency>
            <artifactId>spring-boot-starter-jetty</artifactId>
            <groupId>org.springframework.boot</groupId>
        </dependency>-->

        <!--3.依赖undertow
        <dependency>
            <artifactId>spring-boot-starter-undertow</artifactId>
            <groupId>org.springframework.boot</groupId>
        </dependency>-->

4.使用外部Servlet容器

1. 下载tomcat服务 springboot3.1.2 对应 Tomcat10.1.11 版本不对应会有问题，访问不了

2.设置当前maven项目的打包方式

3.让tomcat相关的依赖不参与打包部署，因为外置tomcat服务器已经有这些jar包　　

<!--让它不参与打包部署-->
<dependency>
　　<artifactId>spring-boot-starter-tomcat</artifactId>
　　<groupId>org.springframework.boot</groupId>
　　<scope>provided</scope>
</dependency>

4. 为了让它支持springboot需要加上一下代码：才能启动springboot应用

public class TomcatStartSpringBoot extends SpringBootServletInitializer{

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(SpringbootservletApplication.class);
    }
}