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
* <http://www.gnu.org/licenses/gpl-2.0.html>.
* #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
* <http://www.gnu.org/licenses/gpl-2.0.html>.
* #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.
* <p>
* 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.
*
* <p>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.
*
* <h2>Example</h2>
* <h3>The traditional, XML-based approach</h3>
* 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:
* <pre class="code">
* {@code
* <servlet>
* <servlet-name>dispatcher</servlet-name>
* <servlet-class>
* org.springframework.web.servlet.DispatcherServlet
* </servlet-class>
* <init-param>
* <param-name>contextConfigLocation</param-name>
* <param-value>/WEB-INF/spring/dispatcher-config.xml</param-value>
* </init-param>
* <load-on-startup>1</load-on-startup>
* </servlet>
*
* <servlet-mapping>
* <servlet-name>dispatcher</servlet-name>
* <url-pattern>/</url-pattern>
* </servlet-mapping>}</pre>
*
* <h3>The code-based approach with {@code WebApplicationInitializer}</h3>
* Here is the equivalent {@code DispatcherServlet} registration logic,
* {@code WebApplicationInitializer}-style:
* <pre class="code">
* 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("/");
* }
*
* }</pre>
*
* 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 <em>instance</em> 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.
*
* <p>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}.
*
* <p>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.
*
* <h2>A 100% code-based approach to configuration</h2>
* 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}:
* <pre class="code">
* 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("/");
* }
*
* }</pre>
*
* As an alternative to the above, you can also extend from {@link
* org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer}.
*
* Remember that {@code WebApplicationInitializer} implementations are <em>detected
* automatically</em> -- so you are free to package them within your application as you
* see fit.
*
* <h2>Ordering {@code WebApplicationInitializer} execution</h2>
* {@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}.
*
* <h2>Caveats</h2>
*
* <h3>web.xml versioning</h3>
* <p>{@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
* <em>modify</em> registrations performed in {@code web.xml} through methods such as
* {@link ServletContext#getServletRegistration(String)}. <strong>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.</strong>
*
* <h3>Mapping to '/' under Tomcat</h3>
* <p>Apache Tomcat maps its internal {@code DefaultServlet} to "/", and on Tomcat versions
* <= 7.0.14, this servlet mapping <em>cannot be overridden programmatically</em>.
* 7.0.15 fixes this issue. Overriding the "/" servlet mapping has also been tested
* successfully under GlassFish 3.1.<p>
*
* @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：
* <servlet> * <servlet-name>dispatcher</servlet-name> * <servlet-class> * org.springframework.web.servlet.DispatcherServlet * </servlet-class> * <init-param> * <param-name>contextConfigLocation</param-name> * <param-value>/WEB-INF/spring/dispatcher-config.xml</param-value> * </init-param> * <load-on-startup>1</load-on-startup> * </servlet> * * <servlet-mapping> * <servlet-name>dispatcher</servlet-name> * <url-pattern>/</url-pattern> * </servlet-mapping>
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NULL 博文链接：https://linlargy.iteye.com/blog/1846991