SpringBoot 容器

SpringBoot的容器默认使用的Tomcat，

1.如何修改Servlet容器的相关配置？

• 修改Servlet的配置 （org.springframework.boot.autoconfigure.web.ServerProperties）

  server.servlet.context-path=/crud
  server.port=8081
  

2.如何注册自己的Servlet,Filter,Listener

SpringBoot默认的是以jar包的方式启动嵌入Serlvet容器，没有Web.xml。

• 注册三大组件的方式

  • ServletRegistrationBean

  • FilterRegistrationBean

  • ServletListenerRegistrationBean

    /**
    * @program: spring-boot-restful-crud
    * @description: servlet配置类
    * @author: YuanChangYue
    * @create: 2019-08-19 19:20
    */
    @Configuration
    public class MyServletConfig {
    
    @Bean
    public ServletRegistrationBean myServlet() {
    return new ServletRegistrationBean<>(new MyServlet(), "/myServlet");
    }
    
    @Bean
    public FilterRegistrationBean myFilter() {
    FilterRegistrationBean<Filter> registrationBean = new FilterRegistrationBean<>();
    registrationBean.setFilter(new MyFilter());
    registrationBean.setUrlPatterns(Arrays.asList("/hello", "/myServlet"));
    return registrationBean;
    }
    
    @Bean
    public ServletListenerRegistrationBean myListen() {
    return new ServletListenerRegistrationBean(new MyListen());
    }
    
    }
    
    

    /**
    * @program: spring-boot-restful-crud
    * @description: 自定义Listen
    * @author: YuanChangYue
    * @create: 2019-08-19 19:42
    */
    public class MyListen implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
    System.out.println("contextInitialized ing....");
    }
    
    @Override
    public void contextDestroyed(ServletContextEvent sce) {
    System.out.println("contextDestroyed....");
    }
    }
    
    

    /**
    * @program: spring-boot-restful-crud
    * @description: 自定义Filter
    * @author: YuanChangYue
    * @create: 2019-08-19 19:33
    */
    public class MyFilter implements Filter {
    
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    System.out.println("servletRequest ing..... ");
    filterChain.doFilter(servletRequest, servletResponse);
    }
    
    @Override
    public void destroy() {
    System.out.println("destroy ");
    }
    }
    
    

    /**
    * @program: spring-boot-restful-crud
    * @description: 自定义Servlet
    * @author: YuanChangYue
    * @create: 2019-08-19 19:17
    */
    public class MyServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("myServlet--doPost");
    }
    
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    doPost(req, resp);
    }
    }
    
    

• SpringBoot 在自动配置SpringMvc，就将DispatcherServlet配置好了

3. 切换Servlet容器

• 切换到 Jetty

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

4.使用外置Servlet容器

**优点： **简单 ，便携.

缺点：默认不支持JSP,优化定制复杂.