SpringBoot Boot内嵌Tomcat

Spring Boot：

SpringBoot-start-web 里面依赖的环境中

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：

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

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：

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

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。

巴特西

SpringBoot Boot内嵌Tomcat

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