java - Spring 启动 |多个调度程序 Servlet

Question

我从一个新的 Spring Boot 应用程序开始，我需要有两个 Dispatcher servlet。我正在做这样的事情:

public class ApplicationInitializer implements WebApplicationInitializer {
    @Override
    public void onStartup(ServletContext container) {

        AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
        rootContext.register(AppConfig.class);

        container.addListener(new ContextLoaderListener(rootContext));

        AnnotationConfigWebApplicationContext dispatcherContext = new AnnotationConfigWebApplicationContext();
        dispatcherContext.register(DispatcherConfig.class);

        ServletRegistration.Dynamic uiDispatcher = container.addServlet("uiDispatcher",
                new DispatcherServlet(dispatcherContext));
        uiDispatcher.setLoadOnStartup(1);
        uiDispatcher.setInitParameter("initializeJ2EE", "false");
        uiDispatcher.addMapping("/ui/*");

        ServletRegistration.Dynamic utilDispatcher = container.addServlet("utilDispatcher",
                new DispatcherServlet());
        utilDispatcher.setLoadOnStartup(1);
        utilDispatcher.setInitParameter("initializeJ2EE", "false");
        utilDispatcher.addMapping("/util/*");

        container.addListener(new ContextLoaderListener(rootContext));
    }

这看起来是正确的做法吗？过去，我从未需要使用“WebApplicationInitializer”来启动应用程序。如果我需要多个 Dispatcher servlet，是否需要这样做，或者是否有更好的方法来处理这个问题？

Answer 1

是的，确实如此。 Spring 为我们提供了 web.xml 和 WebApplicationInitializer 来配置 DispatcherServlet(甚至是两者的混合)。如果您对多个 DispathcherServlet 的 web.xml 感兴趣。这是一个例子

<servlet>
    <description>Monitor</description>
    <servlet-name>monitor</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextClass</param-name>
        <param-value>
            org.springframework.web.context.support.AnnotationConfigWebApplicationContext
        </param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>monitor</servlet-name>
    <url-pattern>/monitor</url-pattern>
</servlet-mapping>

<servlet>
    <description>Metrics</description>
    <servlet-name>metrics</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextClass</param-name>
        <param-value>
            org.springframework.web.context.support.AnnotationConfigWebApplicationContext
        </param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>metrics</servlet-name>
    <url-pattern>/metrics/</url-pattern>
</servlet-mapping>