spring boot 启动

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接触到新项目，里面的用的是spring 4.0,故项目启动用了spring boot

code:

 

package com.vcredit.jdev.obiz;

/*
 * #%L
 * obiz
 * %%
 * Copyright (C) 2013 - 2014 Shark Xu
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 2 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.boot.orm.jpa.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

@Configuration
@Import(net.gplatform.sudoor.server.Application.class)
@EnableAutoConfiguration
@ComponentScan
@EntityScan
public class Application extends SpringBootServletInitializer {
	/*
	 * Used by spring boot
	 */
	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}

	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
		return application.sources(Application.class);
	}

}

 @Import(net.gplatform.sudoor.server.Application.class)

 

  对应的模块：

 

package net.gplatform.sudoor.server;

/*
 * #%L
 * obiz
 * %%
 * Copyright (C) 2013 - 2014 Shark Xu
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 2 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import org.springframework.boot.SpringApplication;
import org.springframework.boot.orm.jpa.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@Configuration
@ImportResource({ "classpath:META-INF/cxf/cxf.xml", "classpath:META-INF/cxf/cxf-servlet.xml", "classpath*:META-INF/cxf/cxf-extension-*.xml",
		"classpath*:spring/**/*-config-*.xml" })
@ComponentScan
//TODO: Don't support multiple config, so can only config multiple value. Will change this once multiple config supported
@EntityScan({ "net.gplatform.sudoor.server", "com.vcredit.jdev" })
@EnableJpaRepositories({ "net.gplatform.sudoor.server", "com.vcredit.jdev" })
public class Application {

	/*
	 * Used by spring boot
	 */
	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}

}

 SpringBootServletInitializer：

 

 

/*
 * Copyright 2012-2014 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.boot.context.web;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.builder.ParentContextApplicationContextInitializer;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext;
import org.springframework.context.ApplicationContext;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.WebApplicationContext;

/**
 * A handy opinionated {@link WebApplicationInitializer} for applications that starts a
 * Spring Boot application and lets it bind to the servlet and filter mappings. If your
 * application is more complicated consider using one of the other
 * WebApplicationInitializers.
 * 

 * Note that a WebApplicationInitializer is only needed if you are building a war file and
 * deploying it. If you prefer to run an embedded container (we do) then you won't need
 * this at all.
 * 
 * @author Dave Syer
 */
public abstract class SpringBootServletInitializer implements WebApplicationInitializer {

	protected final Log logger = LogFactory.getLog(getClass());

	@Override
	public void onStartup(ServletContext servletContext) throws ServletException {
		WebApplicationContext rootAppContext = createRootApplicationContext(servletContext);
		if (rootAppContext != null) {
			servletContext.addListener(new ContextLoaderListener(rootAppContext) {
				@Override
				public void contextInitialized(ServletContextEvent event) {
					// no-op because the application context is already initialized
				}
			});
		}
		else {
			this.logger.debug("No ContextLoaderListener registered, as "
					+ "createRootApplicationContext() did not "
					+ "return an application context");
		}
	}

	protected WebApplicationContext createRootApplicationContext(
			ServletContext servletContext) {
		ApplicationContext parent = null;
		Object object = servletContext
				.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
		if (object instanceof ApplicationContext) {
			this.logger.info("Root context already created (using as parent).");
			parent = (ApplicationContext) object;
			servletContext.setAttribute(
					WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, null);
		}
		SpringApplicationBuilder application = new SpringApplicationBuilder();
		if (parent != null) {
			application.initializers(new ParentContextApplicationContextInitializer(
					parent));
		}
		application.initializers(new ServletContextApplicationContextInitializer(
				servletContext));
		application.contextClass(AnnotationConfigEmbeddedWebApplicationContext.class);
		application = configure(application);
		// Ensure error pages are registered
		application.sources(ErrorPageFilter.class);
		return (WebApplicationContext) application.run();
	}

	/**
	 * Configure the application. Normally all you would need to do it add sources (e.g.
	 * config classes) because other settings have sensible defaults. You might choose
	 * (for instance) to add default command line arguments, or set an active Spring
	 * profile.
	 * @param application a builder for the application context
	 * @see SpringApplicationBuilder
	 */
	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
		return application;
	}

}

 

 

WebApplicationInitializer 

 

/*
 * Copyright 2002-2012 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;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;

/**
 * Interface to be implemented in Servlet 3.0+ environments in order to configure the
 * {@link ServletContext} programmatically -- as opposed to (or possibly in conjunction
 * with) the traditional {@code web.xml}-based approach.
 *
 * 
Implementations of this SPI will be detected automatically by {@link
 * SpringServletContainerInitializer}, which itself is bootstrapped automatically
 * by any Servlet 3.0 container. See {@linkplain SpringServletContainerInitializer its
 * Javadoc} for details on this bootstrapping mechanism.
 *
 * 
Example
 * 
The traditional, XML-based approach
 * Most Spring users building a web application will need to register Spring's {@code
 * DispatcherServlet}. For reference, in WEB-INF/web.xml, this would typically be done as
 * follows:
 * 
 * {@code
 * 
 *   dispatcher
 *   
 *     org.springframework.web.servlet.DispatcherServlet
 *   
 *   
 *     contextConfigLocation
 *     /WEB-INF/spring/dispatcher-config.xml
 *   
 *   1
 * 
 *
 * 
 *   dispatcher
 *   /
 * }
 *
 * 
The code-based approach with {@code WebApplicationInitializer}
 * Here is the equivalent {@code DispatcherServlet} registration logic,
 * {@code WebApplicationInitializer}-style:
 * 
 * public class MyWebAppInitializer implements WebApplicationInitializer {
 *
 *    @Override
 *    public void onStartup(ServletContext container) {
 *      XmlWebApplicationContext appContext = new XmlWebApplicationContext();
 *      appContext.setConfigLocation("/WEB-INF/spring/dispatcher-config.xml");
 *
 *      ServletRegistration.Dynamic dispatcher =
 *        container.addServlet("dispatcher", new DispatcherServlet(appContext));
 *      dispatcher.setLoadOnStartup(1);
 *      dispatcher.addMapping("/");
 *    }
 *
 * }
 *
 * As an alternative to the above, you can also extend from {@link
 * org.springframework.web.servlet.support.AbstractDispatcherServletInitializer}.
 *
 * As you can see, thanks to Servlet 3.0's new {@link ServletContext#addServlet} method
 * we're actually registering an instance of the {@code DispatcherServlet}, and
 * this means that the {@code DispatcherServlet} can now be treated like any other object
 * -- receiving constructor injection of its application context in this case.
 *
 * 
This style is both simpler and more concise. There is no concern for dealing with
 * init-params, etc, just normal JavaBean-style properties and constructor arguments. You
 * are free to create and work with your Spring application contexts as necessary before
 * injecting them into the {@code DispatcherServlet}.
 *
 * 
Most major Spring Web components have been updated to support this style of
 * registration.  You'll find that {@code DispatcherServlet}, {@code FrameworkServlet},
 * {@code ContextLoaderListener} and {@code DelegatingFilterProxy} all now support
 * constructor arguments. Even if a component (e.g. non-Spring, other third party) has not
 * been specifically updated for use within {@code WebApplicationInitializers}, they still
 * may be used in any case. The Servlet 3.0 {@code ServletContext} API allows for setting
 * init-params, context-params, etc programmatically.
 *
 * 
A 100% code-based approach to configuration
 * In the example above, {@code WEB-INF/web.xml} was successfully replaced with code in
 * the form of a {@code WebApplicationInitializer}, but the actual
 * {@code dispatcher-config.xml} Spring configuration remained XML-based.
 * {@code WebApplicationInitializer} is a perfect fit for use with Spring's code-based
 * {@code @Configuration} classes. See @{@link
 * org.springframework.context.annotation.Configuration Configuration} Javadoc for
 * complete details, but the following example demonstrates refactoring to use Spring's
 * {@link org.springframework.web.context.support.AnnotationConfigWebApplicationContext
 * AnnotationConfigWebApplicationContext} in lieu of {@code XmlWebApplicationContext}, and
 * user-defined {@code @Configuration} classes {@code AppConfig} and
 * {@code DispatcherConfig} instead of Spring XML files. This example also goes a bit
 * beyond those above to demonstrate typical configuration of the 'root' application
 * context and registration of the {@code ContextLoaderListener}:
 * 
 * public class MyWebAppInitializer implements WebApplicationInitializer {
 *
 *    @Override
 *    public void onStartup(ServletContext container) {
 *      // Create the 'root' Spring application context
 *      AnnotationConfigWebApplicationContext rootContext =
 *        new AnnotationConfigWebApplicationContext();
 *      rootContext.register(AppConfig.class);
 *
 *      // Manage the lifecycle of the root application context
 *      container.addListener(new ContextLoaderListener(rootContext));
 *
 *      // Create the dispatcher servlet's Spring application context
 *      AnnotationConfigWebApplicationContext dispatcherContext =
 *        new AnnotationConfigWebApplicationContext();
 *      dispatcherContext.register(DispatcherConfig.class);
 *
 *      // Register and map the dispatcher servlet
 *      ServletRegistration.Dynamic dispatcher =
 *        container.addServlet("dispatcher", new DispatcherServlet(dispatcherContext));
 *      dispatcher.setLoadOnStartup(1);
 *      dispatcher.addMapping("/");
 *    }
 *
 * }
 *
 * As an alternative to the above, you can also extend from {@link
 * org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer}.
 *
 * Remember that {@code WebApplicationInitializer} implementations are detected
 * automatically -- so you are free to package them within your application as you
 * see fit.
 *
 * 
Ordering {@code WebApplicationInitializer} execution
 * {@code WebApplicationInitializer} implementations may optionally be annotated at the
 * class level with Spring's @{@link org.springframework.core.annotation.Order Order}
 * annotation or may implement Spring's {@link org.springframework.core.Ordered Ordered}
 * interface. If so, the initializers will be ordered prior to invocation. This provides
 * a mechanism for users to ensure the order in which servlet container initialization
 * occurs. Use of this feature is expected to be rare, as typical applications will likely
 * centralize all container initialization within a single {@code WebApplicationInitializer}.
 *
 * 
Caveats
 *
 * 
web.xml versioning
 * 
{@code WEB-INF/web.xml} and {@code WebApplicationInitializer} use are not mutually
 * exclusive; for example, web.xml can register one servlet, and a {@code
 * WebApplicationInitializer} can register another. An initializer can even
 * modify registrations performed in {@code web.xml} through methods such as
 * {@link ServletContext#getServletRegistration(String)}. However, if
 * {@code WEB-INF/web.xml} is present in the application, its {@code version} attribute
 * must be set to "3.0" or greater, otherwise {@code ServletContainerInitializer}
 * bootstrapping will be ignored by the servlet container.
 *
 * 
Mapping to '/' under Tomcat
 * 
Apache Tomcat maps its internal {@code DefaultServlet} to "/", and on Tomcat versions
 * <= 7.0.14, this servlet mapping cannot be overridden programmatically.
 * 7.0.15 fixes this issue. Overriding the "/" servlet mapping has also been tested
 * successfully under GlassFish 3.1.

 *
 * @author Chris Beams
 * @since 3.1
 * @see SpringServletContainerInitializer
 * @see org.springframework.web.context.AbstractContextLoaderInitializer
 * @see org.springframework.web.servlet.support.AbstractDispatcherServletInitializer
 * @see org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer
 */
public interface WebApplicationInitializer {

	/**
	 * Configure the given {@link ServletContext} with any servlets, filters, listeners
	 * context-params and attributes necessary for initializing this web application. See
	 * examples {@linkplain WebApplicationInitializer above}.
	 * @param servletContext the {@code ServletContext} to initialize
	 * @throws ServletException if any call against the given {@code ServletContext}
	 * throws a {@code ServletException}
	 */
	void onStartup(ServletContext servletContext) throws ServletException;

}

 这块就是用

* public class MyWebAppInitializer implements WebApplicationInitializer {
 *
 *    @Override
 *    public void onStartup(ServletContext container) {
 *      XmlWebApplicationContext appContext = new XmlWebApplicationContext();
 *      appContext.setConfigLocation("/WEB-INF/spring/dispatcher-config.xml");
 *
 *      ServletRegistration.Dynamic dispatcher =
 *        container.addServlet("dispatcher", new DispatcherServlet(appContext));
 *      dispatcher.setLoadOnStartup(1);
 *      dispatcher.addMapping("/");
 *    }
 *
 * }

来代替传统的web.xml配置，如下：

* 
 *   dispatcher
 *   
 *     org.springframework.web.servlet.DispatcherServlet
 *   
 *   
 *     contextConfigLocation
 *     /WEB-INF/spring/dispatcher-config.xml
 *   
 *   1
 * 
 *
 * 
 *   dispatcher
 *   /
 *