SpringBoot-Servlet容器、组件学习

一、配置嵌入式的Servlet容器二、注册Servlet、Filter、Listener三、其他的嵌入式Servlet容器

一、配置嵌入式的Servlet容器

背景： SpringBoot默认使用Tomcat作为嵌入式的Servlet容器 思考： 1）SpringBoot中如何定制和修改Servlet容器的相关配置？ 1、在配置文件中配置server

server.port=8080 server.servlet.context-path=/crud server.tomcat.uri-encoding=GBK //通用的Servlet容器设置 server.xxx //Tomcat设置 server.tomcat.xxx

2、编写一个嵌入式的Servlet容器的定制器（WebServerFactoryCustomizer）；来修改配置

@Bean public WebServerFactoryCustomizer<ConfigurableWebServerFactory> webServerFactoryCustomizer() { return new WebServerFactoryCustomizer<ConfigurableWebServerFactory>() { //定制嵌入式的Servlet容器相关规则 @Override public void customize(ConfigurableWebServerFactory factory) { factory.setPort(8083); } }; }

题外话：

二、注册Servlet、Filter、Listener

1）注册Servlet（ServletRegistrationBean） 配置类：

@Bean public ServletRegistrationBean myServlet() { ServletRegistrationBean servletRegistrationBean= new ServletRegistrationBean(new MyServlet(),"/myServlet"); return servletRegistrationBean; }

MyServlet类：

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 { resp.getWriter().write("Hello,MyServlet"); } }

2）注册Filter alt+Enter是返回变量快捷键

@Bean public FilterRegistrationBean myFilter() { FilterRegistrationBean filterRegistrationBean= new FilterRegistrationBean<>(); filterRegistrationBean.setFilter(new MyFilter()); filterRegistrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet")); return filterRegistrationBean; }

3）注册Listener

@Bean public ServletListenerRegistrationBean myListener() { ServletListenerRegistrationBean<MyListener> myListenerServletListenerRegistrationBean = new ServletListenerRegistrationBean<>(new MyListener()); return myListenerServletListenerRegistrationBean; }

三、其他的嵌入式Servlet容器

Tomcat Jetty（长连接） Undertow（不支持JSP） SpringBoot默认可切换以上2个容器 1、切换jetty，删除tomcat相关依赖，加入jetty依赖

<!--引入其他的Servlet容器--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jetty</artifactId> </dependency>

2、Undertow

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

3、引入web模块默认使用tomcat