Spring MVC - DispatcherServlet by annotations

Question

我得到了spring MVC应用程序。它在Tomcat7上运行。到目前为止，我在web.xml文件中得到了这一部分：

<servlet>
        <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>
                /WEB-INF/app-config.xml
            </param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
        <url-pattern>*.htm</url-pattern>
    </servlet-mapping>

有没有办法通过注解来初始化它？我得到了一个MainSettings.java类，其中我所有的bean都由@Bean注释初始化。那么我如何在那里初始化DispatherServlet呢？

Answer 1

以下是带有注释的示例。希望这对你有帮助。

public class ApplicationInitializer implements WebApplicationInitializer {

    //Called first when the application starts loading.
    public void onStartup(ServletContext servletContext)
            throws ServletException {
        System.out.println("Inside application initializer...");

        //Registering the class that incorporates the annotated DispatcherServlet configuration of spring
        AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
        rootContext.register(DispatcherConfig.class);

        //Adding the listener for the rootContext
        servletContext.addListener(new ContextLoaderListener(rootContext));

        //Registering the dispatcher servlet mappings.
        ServletRegistration.Dynamic dispatcher = servletContext.addServlet("dispatcher", new DispatcherServlet(rootContext));
        dispatcher.setLoadOnStartup(1);
        dispatcher.addMapping("/");
    }

}

Answer 2

之所以这样写，是因为Japs's answer会导致创建另一个上下文，该上下文看不到安全上下文的内容。

public class WebInitializer extends
        AbstractAnnotationConfigDispatcherServletInitializer {

    private static final Log LOGGER = LogFactory.getLog(WebInitializer.class);

    @Override
    protected Class<?>[] getRootConfigClasses() {
        /*  this is where you will return you config class
         *  your root config class should @Import other configs 
         *  to make them work without needing them to add there
         */
        return new Class[] { ViewConfig.class };
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[0];
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }

}