springboot配置和注册组件

注册Servlet三大组件(servlet、Filter、Listener)

由于SpringBoot默认是以jar包的方式启动嵌入式Servlet容器来启动SpringBoot的web应用,没有web.xml文件
注册三大组件用以下方式:
ServletRegistrationBean
FilterRegistrationBean
ServletListenerRegistrationBean

@Configuration
public class MyMvcConfig extends WebMvcConfigurationSupport {
    @Bean
    public ServletRegistrationBean myServlet(){
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(new MyServlet(),"/hello");
        return registrationBean;
    }
}
    
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("doPost");
    }
}

这是注册servlet,其他两个注册器同样方式
使用其他Servlet容器
默认是使用tomcat
Jetty(长连接) 时使用即聊天程序
Undertow(不支持jsp),但性能高,并发无阻塞

//把tomcat引入的jar包排除,然后引入jetty即可,undertow类似
<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
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转载自blog.csdn.net/wjs040/article/details/94448971