/*

  * Copyright 2002-2016 the original author or authors.

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.springframework.web.servlet.support;

 import org.springframework.util.ObjectUtils;

 import org.springframework.web.context.WebApplicationContext;

 import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;

 /**

  * Base class for {@link org.springframework.web.WebApplicationInitializer}

  * implementations that register a

  * {@link org.springframework.web.servlet.DispatcherServlet DispatcherServlet}

  * configured with annotated classes, e.g. Spring's

  * {@link org.springframework.context.annotation.Configuration @Configuration} classes.

  *

  * <p>Concrete implementations are required to implement {@link #getRootConfigClasses()}

  * and {@link #getServletConfigClasses()} as well as {@link #getServletMappings()}.

  * Further template and customization methods are provided by

  * {@link AbstractDispatcherServletInitializer}.

  *

  * <p>This is the preferred approach for applications that use Java-based

  * Spring configuration.

  *

  * @author Arjen Poutsma

  * @author Chris Beams

  * @since 3.2

  */

 public abstract class AbstractAnnotationConfigDispatcherServletInitializer

         extends AbstractDispatcherServletInitializer {

     /**

      * {@inheritDoc}

      * <p>This implementation creates an {@link AnnotationConfigWebApplicationContext},

      * providing it the annotated classes returned by {@link #getRootConfigClasses()}.

      * Returns {@code null} if {@link #getRootConfigClasses()} returns {@code null}.

      */

     @Override

     protected WebApplicationContext createRootApplicationContext() {

         Class<?>[] configClasses = getRootConfigClasses();

         if (!ObjectUtils.isEmpty(configClasses)) {

             AnnotationConfigWebApplicationContext rootAppContext = new AnnotationConfigWebApplicationContext();

             rootAppContext.register(configClasses);

             return rootAppContext;

         }

         else {

             return null;

         }

     }

     /**

      * {@inheritDoc}

      * <p>This implementation creates an {@link AnnotationConfigWebApplicationContext},

      * providing it the annotated classes returned by {@link #getServletConfigClasses()}.

      */

     @Override

     protected WebApplicationContext createServletApplicationContext() {

         AnnotationConfigWebApplicationContext servletAppContext = new AnnotationConfigWebApplicationContext();

         Class<?>[] configClasses = getServletConfigClasses();

         if (!ObjectUtils.isEmpty(configClasses)) {

             servletAppContext.register(configClasses);

         }

         return servletAppContext;

     }

     /**

      * Specify {@link org.springframework.context.annotation.Configuration @Configuration}

      * and/or {@link org.springframework.stereotype.Component @Component} classes to be

      * provided to the {@linkplain #createRootApplicationContext() root application context}.

      * @return the configuration classes for the root application context, or {@code null}

      * if creation and registration of a root context is not desired

      */

     protected abstract Class<?>[] getRootConfigClasses();

     /**

      * Specify {@link org.springframework.context.annotation.Configuration @Configuration}

      * and/or {@link org.springframework.stereotype.Component @Component} classes to be

      * provided to the {@linkplain #createServletApplicationContext() dispatcher servlet

      * application context}.

      * @return the configuration classes for the dispatcher servlet application context or

      * {@code null} if all configuration is specified through root config classes.

      */

     protected abstract Class<?>[] getServletConfigClasses();

 }

 package spittr.config;

 import org.springframework.context.annotation.ComponentScan;

 import org.springframework.context.annotation.Configuration;

 import org.springframework.context.annotation.FilterType;

 import org.springframework.web.servlet.config.annotation.EnableWebMvc;

 /**

  * Created by ${秦林森} on 2017/6/12.

  */

 @Configuration

 /**

  * excludeFilters是指明不被@ComponentScan扫描的类型

  */

 @ComponentScan(basePackages = {"spittr"},excludeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION,value = EnableWebMvc.class)})

 public class RootConfig {

 }

 package spittr.config;

 import org.springframework.context.annotation.Bean;

 import org.springframework.context.annotation.ComponentScan;

 import org.springframework.context.annotation.Configuration;

 import org.springframework.web.servlet.ViewResolver;

 import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;

 import org.springframework.web.servlet.config.annotation.EnableWebMvc;

 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

 import org.springframework.web.servlet.view.BeanNameViewResolver;

 import org.springframework.web.servlet.view.InternalResourceViewResolver;

 import spittr.web.HomeController;

 /**

  * Created by ${秦林森} on 2017/6/12.

  */

 @Configuration

 @EnableWebMvc

 @ComponentScan(basePackages = {"spittr.web"})

 public class WebConfig extends WebMvcConfigurerAdapter{

     @Bean

     public ViewResolver viewResolver(){

         InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();

         //设置前缀

         viewResolver.setPrefix("/WEB-INF/views/");

         //设置后缀

         viewResolver.setSuffix(".jsp");

         viewResolver.setExposeContextBeansAsAttributes(true);

         return  viewResolver;

     }

     @Override

     public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {

         configurer.enable();//configure static content handling.

     }

 }

 package spittr.config;

 import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

 /**

  * Created by ${秦林森} on 2017/6/12.

  */

 public class SpittrWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

     @Override

     protected Class<?>[] getRootConfigClasses() {

         return new Class<?>[]{RootConfig.class};

     }

     @Override

     protected Class<?>[] getServletConfigClasses() {

         //specifiy configuration class

         return new Class<?>[]{WebConfig.class};

     }

     @Override

     protected String[] getServletMappings() {

         return new String[]{"*.do"};//Map DispatcherServlet to

     }

 }

 package spittr.web;

 import org.springframework.stereotype.Controller;

 import org.springframework.web.WebApplicationInitializer;

 import org.springframework.web.bind.annotation.RequestMapping;

 import org.springframework.web.bind.annotation.RequestMethod;

 /**

  * Created by ${秦林森} on 2017/6/12.

  */

 @Controller

 @RequestMapping(value = "/people")

 public class HomeController {

     @RequestMapping(value = "/home.do",method = RequestMethod.GET)

     public  String home(){

         return  "home";

     }

 }

 <%--

   Created by IntelliJ IDEA.

   User: Administrator

   Date: 2017/6/12

   Time: 16:25

   To change this template use File | Settings | File Templates.

 --%>

 <%@ page contentType="text/html;charset=UTF-8" language="java" %>

 <html>

 <head>

     <title>spittr</title>

 </head>

 <body>

     welcome to china ,one of the ancient civilized countries.

 </body>

 </html>