SpringBoot Boot内嵌Tomcat

叁歲伎倆 2022-01-28 14:25 362阅读 0赞

# [SpringBoot Boot内嵌Tomcat][SpringBoot Boot_Tomcat] #

Spring Boot：

SpringBoot-start-web 里面依赖的环境中

![1179709-20190427011521361-281322995.png][]

如果是外部的Tomcat 容器，可以通过修改config进行配置

内嵌的呢？

如何定制和修改Servlet容器的相关配置；

1、修改和server有关的配置（ServerProperties类【也是EmbeddedServletContainerCustomizer】）；

经常用的：

server.port=8081
    server.context‐path=/crud
    server.tomcat.uri‐encoding=UTF‐8

//通用的Servlet容器设置 server.xxx //Tomcat的设置 server.tomcat.xxx 最大连接数等等

原理：

@ConfigurationProperties(prefix = "server", ignoreUnknownFields = true)
    public class ServerProperties {
    
        /**
         * Server HTTP port.
         */
        private Integer port;
    
        /**
         * Network address to which the server should bind.
         */
        private InetAddress address;
    
        @NestedConfigurationProperty
        private final ErrorProperties error = new ErrorProperties();
    
        /**
         * Whether X-Forwarded-* headers should be applied to the HttpRequest.
         */
        private Boolean useForwardHeaders;
    
        /**
         * Value to use for the Server response header (if empty, no header is sent).
         */
        private String serverHeader;
    
        /**
         * Maximum size of the HTTP message header.
         */
        private DataSize maxHttpHeaderSize = DataSize.ofKilobytes(8);
    
        /**
         * Time that connectors wait for another HTTP request before closing the connection.
         * When not set, the connector's container-specific default is used. Use a value of -1
         * to indicate no (that is, an infinite) timeout.
         */
        private Duration connectionTimeout;
    
        @NestedConfigurationProperty
        private Ssl ssl;
    
        @NestedConfigurationProperty
        private final Compression compression = new Compression();
    
        @NestedConfigurationProperty
        private final Http2 http2 = new Http2();
    
        private final Servlet servlet = new Servlet();
    
        private final Tomcat tomcat = new Tomcat();
    
        private final Jetty jetty = new Jetty();
    
        private final Undertow undertow = new Undertow();
    
        public Integer getPort() {
            return this.port;
        }
    
        public void setPort(Integer port) {
            this.port = port;
        }
    
        public InetAddress getAddress() {
            return this.address;
        }

2、编写一个EmbeddedServletContainerCustomizer：嵌入式的Servlet容器的定制器；来修改Servlet容器的配置 （已经过时了）

@Bean  //一定要将这个定制器加入到容器中
    public EmbeddedServletContainerCustomizer embeddedServletContainerCustomizer(){
        return new EmbeddedServletContainerCustomizer() {
            //定制嵌入式的Servlet容器相关的规则
            @Override
            public void customize(ConfigurableEmbeddedServletContainer container) {
                container.setPort(8083);
            }
        };
    }

注册Servlet的三大组件 Servlet  Filter  Listener

--------------------

Spring boot 默认以jar包的方式 启动嵌入式tomcat，而不是标准的web应用。 webapp/WEB-INF/web.xml

没有web.xml 也可以注册哦

ServletRegistrationBean

//注册三大组件
    @Bean
    public ServletRegistrationBean myServlet(){
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(new
    MyServlet(),"/myServlet");
        return registrationBean;
    }

举个栗子：

![1179709-20190427024420959-105205331.png][]

MyServlet:

public class MyServlet extends HttpServlet {
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            doPost(req, resp);
        }
    
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            resp.getWriter().write("hello MyServlet");
        }
    }

config:

@Configuration
    public class MyConfig {
    
        @Bean
        public ServletRegistrationBean<Servlet> myServlet(){ //是个class 直接new出来
            ServletRegistrationBean<Servlet> servletServletRegistrationBean =
                    new ServletRegistrationBean<>(new MyServlet(),"/myServlet");
            return servletServletRegistrationBean;
        }
    }

运行后：注册成功

![1179709-20190427024543277-275375933.png][]

FilterRegistrationBean

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

举个栗子：

config中加入组件：

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

过滤器：

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("doFilter 方法執行");
            filterChain.doFilter(servletRequest,servletResponse);
        }
    
        @Override
        public void destroy() {
    
        }
    }

请求后：

![1179709-20190427140101174-725732974.png][]

![1179709-20190427140049120-19242853.png][]

ServletListenerRegistrationBean

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

举个栗子：

/**
     * listener 有好多的！
     */
    public class MyListener implements ServletContextListener {
        @Override
        public void contextInitialized(ServletContextEvent sce) {
            System.out.println("contextInitialized...............");
        }
        @Override
        public void contextDestroyed(ServletContextEvent sce) {
            System.out.println("contextDestroyed..................");
        }
    }

组件注册进去：

@Bean
        public ServletListenerRegistrationBean myListener(){
            ServletListenerRegistrationBean<MyListener> registrationBean = new ServletListenerRegistrationBean<>(
                    new MyListener()); //通過構造函數  s
            return registrationBean;
        }

启动和退出

![1179709-20190427141925923-2051267449.png][]

总结：

Spring boot 帮我们自动配置Spring mvc的时候，自动注册了前端控制器，DispatcherServlet。 （DispatcherServletAutoConfiguration类）

这个类中有个方法：

@Bean(name = DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME)
    @ConditionalOnBean(value = DispatcherServlet.class, name =
    DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)
    public ServletRegistrationBean dispatcherServletRegistration(
          DispatcherServlet dispatcherServlet) {
       ServletRegistrationBean registration = new ServletRegistrationBean(
             dispatcherServlet, this.serverProperties.getServletMapping());
        //默认拦截： /  所有请求；包静态资源，但是不拦截jsp请求；   /*会拦截jsp
        //可以通过server.servletPath来修改SpringMVC前端控制器默认拦截的请求路径
       
       registration.setName(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);
       registration.setLoadOnStartup(
             this.webMvcProperties.getServlet().getLoadOnStartup());
       if (this.multipartConfig != null) {
          registration.setMultipartConfig(this.multipartConfig);
       }
       return registration;
    }

总结一个思路：

经常在看源码时候，发现定义一个接口，然后实现类是个中Factory命名的。通过某个工厂创建组件 xxFactory 是用來得到xx的！

condition的用法，倒入哪個，那個生效。

posted @ 2019-04-27 14:48 [toov5][] 阅读(...) 评论(...) [编辑][Link 1] 收藏

[SpringBoot Boot_Tomcat]: https://www.cnblogs.com/toov5/p/10778750.html
[1179709-20190427011521361-281322995.png]: /images/20220128/e9f0b09f22b04d8882e7f50c2eae9ab5.png
[1179709-20190427024420959-105205331.png]: /images/20220128/60f59990012f4f9585904feffd31cedd.png
[1179709-20190427024543277-275375933.png]: /images/20220128/8ccee0feca8145619f00d83624bbffec.png
[1179709-20190427140101174-725732974.png]: /images/20220128/fdf531564f7944748ba385d9bf68fc6a.png
[1179709-20190427140049120-19242853.png]: /images/20220128/4818c28c6a03482abcedc70a02f5de9c.png
[1179709-20190427141925923-2051267449.png]: /images/20220128/6d9d841d260e4dc5b4c46b7a0f983ee3.png
[toov5]: https://www.cnblogs.com/toov5/
[Link 1]: https://i.cnblogs.com/EditPosts.aspx?postid=10778750