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最新评论
-
lt26w:
理解成门面模式应该比较容易明白吧
FacadePattern-Java代码实例讲解 -
lt26w:
看下面的例子比较明白.
FacadePattern-Java代码实例讲解 -
javaloverkehui:
这也叫文档,别逗我行吗,也就自己看看。
HtmlCleaner API -
SE_XiaoFeng:
至少也应该写个注释吧。
HtmlCleaner API -
jfzshandong:
...
org.springframework.web.filter.CharacterEncodingFilter 配置
Spring配置文件加载流程
Spring配置文件是集成了Spring框架的项目的核心,引擎从哪里开始,中间都执行了哪些操作,小谈一下它的执行流程。
容器先是加载web .xml
接着是applicationContext.xml在web .xml里的注册
一种方法是加入ContextLoaderServlet这个servlet
Xml代码 <embed type="application/x-shockwave-flash" width="14" height="15" src="http://silmon.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf" flashvars="clipboard=%3Ccontext-param%3E%0A%09%09%3Cparam-name%3EcontextConfigLocation%3C%2Fparam-name%3E%0A%09%09%3Cparam-value%3E%2FWEB-INF%2FapplicationContext.xml%3C%2Fparam-value%3E%0A%09%3C%2Fcontext-param%3E%0A%20%20%20%20%20%3Cservlet%3E%0A%09%09%3Cservlet-name%3Econtext%3C%2Fservlet-name%3E%0A%09%09%3Cservlet-class%3E%0A%09%09%09org.springframework.web.context.ContextLoaderServlet%0A%09%09%3C%2Fservlet-class%3E%0A%09%09%3Cload-on-startup%3E0%3C%2Fload-on-startup%3E%0A%09%3C%2Fservlet%3E" quality="high" allowscriptaccess="always" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed>
- < context-param >
- < param-name > contextConfigLocation </ param-name >
- < param-value > /WEB -INF/applicationContext.xml </ param-value >
- </ context-param >
- < servlet >
- < servlet-name > context </ servlet-name >
- < servlet-class >
- org.springframework.web .context.ContextLoaderServlet
- </ servlet-class >
- < load-on-startup > 0 </ load-on-startup >
- </ servlet >
<context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB -INF/applicationContext.xml</param-value> </context-param> <servlet> <servlet-name>context</servlet-name> <servlet-class> org.springframework.web .context.ContextLoaderServlet </servlet-class> <load-on-startup>0</load-on-startup> </servlet>
还有一种是添加ContextLoaderListener这个监听器
Xml代码 <embed type="application/x-shockwave-flash" width="14" height="15" src="http://silmon.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf" flashvars="clipboard=%3Ccontext-param%3E%0A%20%20%20%20%3Cparam-name%3EcontextConfigLocation%3C%2Fparam-name%3E%0A%20%20%20%20%3Cparam-value%3E%2FWEB-INF%2FapplicationContext.xml%3C%2Fparam-value%3E%0A%3C%2Fcontext-param%3E%0A%0A%3Clistener%3E%0A%20%20%20%20%3Clistener-class%3Eorg.springframework.web.context.ContextLoaderListener%3C%2Flistener-class%3E%0A%3C%2Flistener%3E" quality="high" allowscriptaccess="always" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed>
- < context-param >
- < param-name > contextConfigLocation </ param-name >
- < param-value > /WEB -INF/applicationContext.xml </ param-value >
- </ context-param >
- < listener >
- < listener-class > org.springframework.web .context.ContextLoaderListener </ listener-class >
- </ listener >
<context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB -INF/applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web .context.ContextLoaderListener</listener-class> </listener>
下面是ContextLoaderServlet源代码
Java代码 <embed type="application/x-shockwave-flash" width="14" height="15" src="http://silmon.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf" flashvars="clipboard=package%20org.springframework.web.context%3B%0A%0Aimport%20java.io.IOException%3B%0A%0Aimport%20javax.servlet.ServletException%3B%0Aimport%20javax.servlet.http.HttpServlet%3B%0Aimport%20javax.servlet.http.HttpServletRequest%3B%0Aimport%20javax.servlet.http.HttpServletResponse%3B%0A%0Apublic%20class%20ContextLoaderServlet%20extends%20HttpServlet%20%7B%0A%0A%09private%20ContextLoader%20contextLoader%3B%0A%0A%0A%09%2F**%0A%09%20*%20Initialize%20the%20root%20web%20application%20context.%0A%09%20*%2F%0A%0Apublic%20void%20init()%20throws%20ServletException%20%7B%0A%09%09this.contextLoader%20%3D%20createContextLoader()%3B%0A%09%09this.contextLoader.initWebApplicationContext(getServletContext())%3B%0A%09%7D%09%2F**%0A%09%20*%20Create%20the%20ContextLoader%20to%20use.%20Can%20be%20overridden%20in%20subclasses.%0A%09%20*%20%40return%20the%20new%20ContextLoader%0A%09%20*%2F%0A%09protected%20ContextLoader%20createContextLoader()%20%7B%0A%09%09return%20new%20ContextLoader()%3B%0A%09%7D%0A%0A%09%2F**%0A%09%20*%20Return%20the%20ContextLoader%20used%20by%20this%20servlet.%20%0A%09%20*%20%40return%20the%20current%20ContextLoader%0A%09%20*%2F%0A%09public%20ContextLoader%20getContextLoader()%20%7B%0A%09%09return%20this.contextLoader%3B%0A%09%7D%0A%0A%0A%09%2F**%0A%09%20*%20Close%20the%20root%20web%20application%20context.%0A%09%20*%2F%0A%09public%20void%20destroy()%20%7B%0A%09%09if%20(this.contextLoader%20!%3D%20null)%20%7B%0A%09%09%09this.contextLoader.closeWebApplicationContext(getServletContext())%3B%0A%09%09%7D%0A%09%7D%0A%0A%0A%09%2F**%0A%09%20*%20This%20should%20never%20even%20be%20called%20since%20no%20mapping%20to%20this%20servlet%20should%0A%09%20*%20ever%20be%20created%20in%20web.xml.%20That's%20why%20a%20correctly%20invoked%20Servlet%202.3%0A%09%20*%20listener%20is%20much%20more%20appropriate%20for%20initialization%20work%20%3B-)%0A%09%20*%2F%0A%09public%20void%20service(HttpServletRequest%20request%2C%20HttpServletResponse%20response)%20throws%20IOException%20%7B%0A%09%09getServletContext().log(%0A%09%09%09%09%22Attempt%20to%20call%20service%20method%20on%20ContextLoaderServlet%20as%20%5B%22%20%2B%0A%09%09%09%09request.getRequestURI()%20%2B%20%22%5D%20was%20ignored%22)%3B%0A%09%09response.sendError(HttpServletResponse.SC_BAD_REQUEST)%3B%0A%09%7D%0A%0A%0A%09public%20String%20getServletInfo()%20%7B%0A%09%09return%20%22ContextLoaderServlet%20for%20Servlet%20API%202.3%20%22%20%2B%0A%09%09%20%20%20%20%22(deprecated%20in%20favor%20of%20ContextLoaderListener%20for%20Servlet%20API%202.4)%22%3B%0A%09%7D%0A%0A%7D" quality="high" allowscriptaccess="always" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed>
- package org.springframework.web .context;
- import java.io.IOException;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- public class ContextLoaderServlet extends HttpServlet {
- private ContextLoader contextLoader ;
- /**
- * Initialize the root web application context.
- */
- public void init() throws ServletException {
- this .contextLoader = createContextLoader();
- this .contextLoader .initWebApplicationContext(getServletContext());
- } /**
- * Create the ContextLoader to use. Can be overridden in subclasses.
- * @return the new ContextLoader
- */
- protected ContextLoader createContextLoader() {
- return new ContextLoader ();
- }
- /**
- * Return the ContextLoader used by this servlet.
- * @return the current ContextLoader
- */
- public ContextLoader getContextLoader() {
- return this .contextLoader ;
- }
- /**
- * Close the root web application context.
- */
- public void destroy() {
- if ( this .contextLoader != null ) {
- this .contextLoader .closeWebApplicationContext(getServletContext());
- }
- }
- /**
- * This should never even be called since no mapping to this servlet should
- * ever be created in web .xml. That's why a correctly invoked Servlet 2.3
- * listener is much more appropriate for initialization work ;-)
- */
- public void service(HttpServletRequest request, HttpServletResponse response) throws IOException {
- getServletContext().log(
- "Attempt to call service method on ContextLoaderServlet as [" +
- request.getRequestURI() + "] was ignored" );
- response.sendError(HttpServletResponse.SC_BAD_REQUEST);
- }
- public String getServletInfo() {
- return "ContextLoaderServlet for Servlet API 2.3 " +
- "(deprecated in favor of ContextLoaderListener for Servlet API 2.4)" ;
- }
- }
package org.springframework.web .context; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ContextLoaderServlet extends HttpServlet { private ContextLoader contextLoader ; /** * Initialize the root web application context. */ public void init() throws ServletException { this.contextLoader = createContextLoader(); this.contextLoader .initWebApplicationContext(getServletContext()); } /** * Create the ContextLoader to use. Can be overridden in subclasses. * @return the new ContextLoader */ protected ContextLoader createContextLoader() { return new ContextLoader (); } /** * Return the ContextLoader used by this servlet. * @return the current ContextLoader */ public ContextLoader getContextLoader() { return this.contextLoader ; } /** * Close the root web application context. */ public void destroy() { if (this.contextLoader != null) { this.contextLoader .closeWebApplicationContext(getServletContext()); } } /** * This should never even be called since no mapping to this servlet should * ever be created in web .xml. That's why a correctly invoked Servlet 2.3 * listener is much more appropriate for initialization work ;-) */ public void service(HttpServletRequest request, HttpServletResponse response) throws IOException { getServletContext().log( "Attempt to call service method on ContextLoaderServlet as [" + request.getRequestURI() + "] was ignored"); response.sendError(HttpServletResponse.SC_BAD_REQUEST); } public String getServletInfo() { return "ContextLoaderServlet for Servlet API 2.3 " + "(deprecated in favor of ContextLoaderListener for Servlet API 2.4)"; } }
ContextLoaderListener源代码
Java代码 <embed type="application/x-shockwave-flash" width="14" height="15" src="http://silmon.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf" flashvars="clipboard=package%20org.springframework.web.context%3B%0A%0Aimport%20javax.servlet.ServletContextEvent%3B%0Aimport%20javax.servlet.ServletContextListener%3B%0A%0Apublic%20class%20ContextLoaderListener%20implements%20ServletContextListener%20%7B%0A%0A%09private%20ContextLoader%20contextLoader%3B%0A%0A%0A%09%2F**%0A%09%20*%20Initialize%20the%20root%20web%20application%20context.%0A%09%20*%2F%0A%09public%20void%20contextInitialized(ServletContextEvent%20event)%20%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20this.contextLoader%20%3D%20createContextLoader()%3B%0A%09%09this.contextLoader.initWebApplicationContext(event.getServletContext())%3B%0A%09%7D%0A%0A%09%2F**%0A%09%20*%20Create%20the%20ContextLoader%20to%20use.%20Can%20be%20overridden%20in%20subclasses.%0A%09%20*%20%40return%20the%20new%20ContextLoader%0A%09%20*%2F%0A%09protected%20ContextLoader%20createContextLoader()%20%7B%0A%09%09return%20new%20ContextLoader()%3B%0A%09%7D%0A%0A%09%2F**%0A%09%20*%20Return%20the%20ContextLoader%20used%20by%20this%20listener.%0A%09%20*%20%40return%20the%20current%20ContextLoader%0A%09%20*%2F%0A%09public%20ContextLoader%20getContextLoader()%20%7B%0A%09%09return%20this.contextLoader%3B%0A%09%7D%0A%0A%0A%09%2F**%0A%09%20*%20Close%20the%20root%20web%20application%20context.%0A%09%20*%2F%0A%09public%20void%20contextDestroyed(ServletContextEvent%20event)%20%7B%0A%09%09if%20(this.contextLoader%20!%3D%20null)%20%7B%0A%09%09%09this.contextLoader.closeWebApplicationContext(event.getServletContext())%3B%0A%09%09%7D%0A%09%7D%0A%0A%7D%0A" quality="high" allowscriptaccess="always" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed>
- package org.springframework.web .context;
- import javax.servlet.ServletContextEvent;
- import javax.servlet.ServletContextListener;
- public class ContextLoaderListener implements ServletContextListener {
- private ContextLoader contextLoader ;
- /**
- * Initialize the root web application context.
- */
- public void contextInitialized(ServletContextEvent event) {
- this .contextLoader = createContextLoader();
- this .contextLoader .initWebApplicationContext(event.getServletContext());
- }
- /**
- * Create the ContextLoader to use. Can be overridden in subclasses.
- * @return the new ContextLoader
- */
- protected ContextLoader createContextLoader() {
- return new ContextLoader ();
- }
- /**
- * Return the ContextLoader used by this listener.
- * @return the current ContextLoader
- */
- public ContextLoader getContextLoader() {
- return this .contextLoader ;
- }
- /**
- * Close the root web application context.
- */
- public void contextDestroyed(ServletContextEvent event) {
- if ( this .contextLoader != null ) {
- this .contextLoader .closeWebApplicationContext(event.getServletContext());
- }
- }
- }
package org.springframework.web .context; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; public class ContextLoaderListener implements ServletContextListener { private ContextLoader contextLoader ; /** * Initialize the root web application context. */ public void contextInitialized(ServletContextEvent event) { this.contextLoader = createContextLoader(); this.contextLoader .initWebApplicationContext(event.getServletContext()); } /** * Create the ContextLoader to use. Can be overridden in subclasses. * @return the new ContextLoader */ protected ContextLoader createContextLoader() { return new ContextLoader (); } /** * Return the ContextLoader used by this listener. * @return the current ContextLoader */ public ContextLoader getContextLoader() { return this.contextLoader ; } /** * Close the root web application context. */ public void contextDestroyed(ServletContextEvent event) { if (this.contextLoader != null) { this.contextLoader .closeWebApplicationContext(event.getServletContext()); } } }
以上都提到了ContextLoader 这个类
Java代码 <embed type="application/x-shockwave-flash" width="14" height="15" src="http://silmon.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf" flashvars="clipboard=package%20org.springframework.web.context%3B%0A%0Apublic%20class%20ContextLoader%20%7B%0A%0A%09public%20static%20final%20String%20CONTEXT_CLASS_PARAM%20%3D%20%22contextClass%22%3B%0A%0A%09public%20static%20final%20String%20CONFIG_LOCATION_PARAM%20%3D%20%22contextConfigLocation%22%3B%0A%0A%20%20%20%20%20%20%20public%20static%20final%20String%20LOCATOR_FACTORY_SELECTOR_PARAM%20%3D%20%22locatorFactorySelector%22%3B%0A%0A%09public%20static%20final%20String%20LOCATOR_FACTORY_KEY_PARAM%20%3D%20%22parentContextKey%22%3B%0A%0A%09private%20static%20final%20String%20DEFAULT_STRATEGIES_PATH%20%3D%20%22ContextLoader.properties%22%3B%0A%0A%0A%09private%20static%20final%20Properties%20defaultStrategies%3B%0A%0A%09static%20%7B%0A%09%09%09%09try%20%7B%0A%09%09%09ClassPathResource%20resource%20%3D%20new%20ClassPathResource(DEFAULT_STRATEGIES_PATH%2C%20ContextLoader.class)%3B%0A%09%09%09defaultStrategies%20%3D%20PropertiesLoaderUtils.loadProperties(resource)%3B%0A%09%09%7D%0A%09%09catch%20(IOException%20ex)%20%7B%0A%09%09%09throw%20new%20IllegalStateException(%22Could%20not%20load%20'ContextLoader.properties'%3A%20%22%20%2B%20ex.getMessage())%3B%0A%09%09%7D%0A%09%7D%0A%0A%0A%09private%20static%20final%20Log%20logger%20%3D%20LogFactory.getLog(ContextLoader.class)%3B%0A%0A%09private%20static%20final%20Map%20currentContextPerThread%20%3D%20CollectionFactory.createConcurrentMapIfPossible(1)%3B%0A%0A%09private%20WebApplicationContext%20context%3B%0A%0A%09private%20BeanFactoryReference%20parentContextRef%3B%0A%0A%09public%20WebApplicationContext%20initWebApplicationContext(ServletContext%20servletContext)%0A%0A%20%20%20%20%20%20%20%20%20%20throws%20IllegalStateException%2C%20BeansException%20%7B%0A%0A%09%09if%20(servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE)%20!%3D%20null)%20%7B%0A%09%09%09throw%20new%20IllegalStateException(%0A%09%09%09%09%09%22Cannot%20initialize%20context%20because%20there%20is%20already%20a%20root%20application%20context%20present%20-%20%22%20%2B%0A%09%09%09%09%09%22check%20whether%20you%20have%20multiple%20ContextLoader*%20definitions%20in%20your%20web.xml!%22)%3B%0A%09%09%7D%0A%0A%09%09servletContext.log(%22Initializing%20Spring%20root%20WebApplicationContext%22)%3B%0A%09%09if%20(logger.isInfoEnabled())%20%7B%0A%09%09%09logger.info(%22Root%20WebApplicationContext%3A%20initialization%20started%22)%3B%0A%09%09%7D%0A%09%09long%20startTime%20%3D%20System.currentTimeMillis()%3B%0A%0A%09%09try%20%7B%0A%09%09%09%2F%2F%20Determine%20parent%20for%20root%20web%20application%20context%2C%20if%20any.%0A%09%09%09ApplicationContext%20parent%20%3D%20loadParentContext(servletContext)%3B%0A%0A%09%09%09%2F%2F%20Store%20context%20in%20local%20instance%20variable%2C%20to%20guarantee%20that%0A%09%09%09%2F%2F%20it%20is%20available%20on%20ServletContext%20shutdown.%0A%09%09%09this.context%20%3D%20createWebApplicationContext(servletContext%2C%20parent)%3B%0A%09%09%09servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE%2C%20this.context)%3B%0A%09%09%09currentContextPerThread.put(Thread.currentThread().getContextClassLoader()%2C%20this.context)%3B%0A%0A%09%09%09if%20(logger.isDebugEnabled())%20%7B%0A%09%09%09%09logger.debug(%22Published%20root%20WebApplicationContext%20as%20ServletContext%20attribute%20with%20name%20%5B%22%20%2B%0A%09%09%09%09%09%09WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE%20%2B%20%22%5D%22)%3B%0A%09%09%09%7D%0A%09%09%09if%20(logger.isInfoEnabled())%20%7B%0A%09%09%09%09long%20elapsedTime%20%3D%20System.currentTimeMillis()%20-%20startTime%3B%0A%09%09%09%09logger.info(%22Root%20WebApplicationContext%3A%20initialization%20completed%20in%20%22%20%2B%20elapsedTime%20%2B%20%22%20ms%22)%3B%0A%09%09%09%7D%0A%0A%09%09%09return%20this.context%3B%0A%09%09%7D%0A%09%09catch%20(RuntimeException%20ex)%20%7B%0A%09%09%09logger.error(%22Context%20initialization%20failed%22%2C%20ex)%3B%0A%09%09%09servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE%2C%20ex)%3B%0A%09%09%09throw%20ex%3B%0A%09%09%7D%0A%09%09catch%20(Error%20err)%20%7B%0A%09%09%09logger.error(%22Context%20initialization%20failed%22%2C%20err)%3B%0A%09%09%09servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE%2C%20err)%3B%0A%09%09%09throw%20err%3B%0A%09%09%7D%0A%09%7D%0A%0A%09protected%20WebApplicationContext%20createWebApplicationContext(%0A%09%09%09ServletContext%20servletContext%2C%20ApplicationContext%20parent)%20throws%20BeansException%20%7B%0A%0A%09%09Class%20contextClass%20%3D%20determineContextClass(servletContext)%3B%0A%09%09if%20(!ConfigurableWebApplicationContext.class.isAssignableFrom(contextClass))%20%7B%0A%09%09%09throw%20new%20ApplicationContextException(%22Custom%20context%20class%20%5B%22%20%2B%20contextClass.getName()%20%2B%0A%09%09%09%09%09%22%5D%20is%20not%20of%20type%20%5B%22%20%2B%20ConfigurableWebApplicationContext.class.getName()%20%2B%20%22%5D%22)%3B%0A%09%09%7D%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- package org.springframework.web .context;
- public class ContextLoader {
- public static final String CONTEXT_CLASS_PARAM = "contextClass" ;
- public static final String CONFIG_LOCATION_PARAM = "contextConfigLocation" ;
- public static final String LOCATOR_FACTORY_SELECTOR_PARAM = "locatorFactorySelector" ;
- public static final String LOCATOR_FACTORY_KEY_PARAM = "parentContextKey" ;
- private static final String DEFAULT_STRATEGIES_PATH = "ContextLoader .properties" ;
- private static final Properties defaultStrategies;
- static {
- try {
- ClassPathResource resource = new ClassPathResource(DEFAULT_STRATEGIES_PATH, ContextLoader . class );
- defaultStrategies = PropertiesLoaderUtils.loadProperties(resource);
- }
- catch (IOException ex) {
- throw new IllegalStateException( "Could not load 'ContextLoader .properties': " + ex.getMessage());
- }
- }
- private static final Log logger = LogFactory.getLog(ContextLoader . class );
- private static final Map currentContextPerThread = CollectionFactory.createConcurrentMapIfPossible( 1 );
- private WebApplicationContext context;
- private BeanFactoryReference parentContextRef;
- public WebApplicationContext initWebApplicationContext(ServletContext servletContext)
- throws IllegalStateException, BeansException {
- if (servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE) != null ) {
- throw new IllegalStateException(
- "Cannot initialize context because there is already a root application context present - " +
- "check whether you have multiple ContextLoader * definitions in your web .xml!" );
- }
- servletContext.log("Initializing Spring root WebApplicationContext" );
- if (logger.isInfoEnabled()) {
- logger.info("Root WebApplicationContext: initialization started" );
- }
- long startTime = System.currentTimeMillis();
- try {
- // Determine parent for root web application context, if any.
- ApplicationContext parent = loadParentContext(servletContext);
- // Store context in local instance variable, to guarantee that
- // it is available on ServletContext shutdown.
- this .context = createWebApplicationContext(servletContext, parent);
- servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, this .context);
- currentContextPerThread.put(Thread.currentThread().getContextClassLoader(), this .context);
- if (logger.isDebugEnabled()) {
- logger.debug("Published root WebApplicationContext as ServletContext attribute with name [" +
- WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE + "]" );
- }
- if (logger.isInfoEnabled()) {
- long elapsedTime = System.currentTimeMillis() - startTime;
- logger.info("Root WebApplicationContext: initialization completed in " + elapsedTime + " ms" );
- }
- return this .context;
- }
- catch (RuntimeException ex) {
- logger.error("Context initialization failed" , ex);
- servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, ex);
- throw ex;
- }
- catch (Error err) {
- logger.error("Context initialization failed" , err);
- servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, err);
- throw err;
- }
- }
- protected WebApplicationContext createWebApplicationContext(
- ServletContext servletContext, ApplicationContext parent) throws BeansException {
- Class contextClass = determineContextClass(servletContext);
- if (!ConfigurableWebApplicationContext. class .isAssignableFrom(contextClass)) {
- throw new ApplicationContextException( "Custom context class [" + contextClass.getName() +
- "] is not of type [" + ConfigurableWebApplicationContext. class .getName() + "]" );
- }
- ConfigurableWebApplicationContext wac =
- (ConfigurableWebApplicationContext) BeanUtils.instantiateClass(contextClass);
- wac.setParent(parent);
- wac.setServletContext(servletContext);
- <span style="color: rgb(0, 0, 0);" >wac.setConfigLocation(servletContext.getInitParameter(CONFIG_LOCATION_PARAM));</span>
- customizeContext(servletContext, wac);
- wac.refresh();
- return wac;
- }
- protected Class determineContextClass(ServletContext servletContext) throws ApplicationContextException {
- String contextClassName = servletContext.getInitParameter(CONTEXT_CLASS_PARAM);
- if (contextClassName != null ) {
- try {
- return ClassUtils.forName(contextClassName);
- }
- catch (ClassNotFoundException ex) {
- throw new ApplicationContextException(
- "Failed to load custom context class [" + contextClassName + "]" , ex);
- }
- }
- else {
- contextClassName = defaultStrategies.getProperty(WebApplicationContext.class .getName());
- try {
- return ClassUtils.forName(contextClassName, ContextLoader . class .getClassLoader());
- }
- catch (ClassNotFoundException ex) {
- throw new ApplicationContextException(
- "Failed to load default context class [" + contextClassName + "]" , ex);
- }
- }
- }
- protected void customizeContext(
- ServletContext servletContext, ConfigurableWebApplicationContext applicationContext) {
- }
- protected ApplicationContext loadParentContext(ServletContext servletContext)
- throws BeansException {
- ApplicationContext parentContext = null ;
- String locatorFactorySelector = servletContext.getInitParameter(LOCATOR_FACTORY_SELECTOR_PARAM);
- String parentContextKey = servletContext.getInitParameter(LOCATOR_FACTORY_KEY_PARAM);
- if (parentContextKey != null ) {
- // locatorFactorySelector may be null, indicating the default "classpath*:beanRefContext.xml"
- BeanFactoryLocator locator = ContextSingletonBeanFactoryLocator.getInstance(locatorFactorySelector);
- if (logger.isDebugEnabled()) {
- logger.debug("Getting parent context definition: using parent context key of '" +
- parentContextKey + "' with BeanFactoryLocator" );
- }
- this .parentContextRef = locator.useBeanFactory(parentContextKey);
- parentContext = (ApplicationContext) this .parentContextRef.getFactory();
- }
- return parentContext;
- }
- public void closeWebApplicationContext(ServletContext servletContext) {
- servletContext.log("Closing Spring root WebApplicationContext" );
- try {
- if ( this .context instanceof ConfigurableWebApplicationContext) {
- ((ConfigurableWebApplicationContext) this .context).close();
- }
- }
- finally {
- currentContextPerThread.remove(Thread.currentThread().getContextClassLoader());
- servletContext.removeAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
- if ( this .parentContextRef != null ) {
- this .parentContextRef.release();
- }
- }
- }
- public static WebApplicationContext getCurrentWebApplicationContext() {
- return (WebApplicationContext) currentContextPerThread.get(Thread.currentThread().getContextClassLoader());
- }
- }
package org.springframework.web .context; public class ContextLoader { public static final String CONTEXT_CLASS_PARAM = "contextClass"; public static final String CONFIG_LOCATION_PARAM = "contextConfigLocation"; public static final String LOCATOR_FACTORY_SELECTOR_PARAM = "locatorFactorySelector"; public static final String LOCATOR_FACTORY_KEY_PARAM = "parentContextKey"; private static final String DEFAULT_STRATEGIES_PATH = "ContextLoader .properties"; private static final Properties defaultStrategies; static { try { ClassPathResource resource = new ClassPathResource(DEFAULT_STRATEGIES_PATH, ContextLoader .class); defaultStrategies = PropertiesLoaderUtils.loadProperties(resource); } catch (IOException ex) { throw new IllegalStateException("Could not load 'ContextLoader .properties': " + ex.getMessage()); } } private static final Log logger = LogFactory.getLog(ContextLoader .class); private static final Map currentContextPerThread = CollectionFactory.createConcurrentMapIfPossible(1); private WebApplicationContext context; private BeanFactoryReference parentContextRef; public WebApplicationContext initWebApplicationContext(ServletContext servletContext) throws IllegalStateException, BeansException { if (servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE) != null) { throw new IllegalStateException( "Cannot initialize context because there is already a root application context present - " + "check whether you have multiple ContextLoader * definitions in your web .xml!"); } servletContext.log("Initializing Spring root WebApplicationContext"); if (logger.isInfoEnabled()) { logger.info("Root WebApplicationContext: initialization started"); } long startTime = System.currentTimeMillis(); try { // Determine parent for root web application context, if any. ApplicationContext parent = loadParentContext(servletContext); // Store context in local instance variable, to guarantee that // it is available on ServletContext shutdown. this.context = createWebApplicationContext(servletContext, parent); servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, this.context); currentContextPerThread.put(Thread.currentThread().getContextClassLoader(), this.context); if (logger.isDebugEnabled()) { logger.debug("Published root WebApplicationContext as ServletContext attribute with name [" + WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE + "]"); } if (logger.isInfoEnabled()) { long elapsedTime = System.currentTimeMillis() - startTime; logger.info("Root WebApplicationContext: initialization completed in " + elapsedTime + " ms"); } return this.context; } catch (RuntimeException ex) { logger.error("Context initialization failed", ex); servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, ex); throw ex; } catch (Error err) { logger.error("Context initialization failed", err); servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, err); throw err; } } protected WebApplicationContext createWebApplicationContext( ServletContext servletContext, ApplicationContext parent) throws BeansException { Class contextClass = determineContextClass(servletContext); if (!ConfigurableWebApplicationContext.class.isAssignableFrom(contextClass)) { throw new ApplicationContextException("Custom context class [" + contextClass.getName() + "] is not of type [" + ConfigurableWebApplicationContext.class.getName() + "]"); } ConfigurableWebApplicationContext wac = (ConfigurableWebApplicationContext) BeanUtils.instantiateClass(contextClass); wac.setParent(parent); wac.setServletContext(servletContext); wac.setConfigLocation(servletContext.getInitParameter(CONFIG_LOCATION_PARAM)); customizeContext(servletContext, wac); wac.refresh(); return wac; } protected Class determineContextClass(ServletContext servletContext)发表评论
-
找不到 org.springframework.test.AbstractTransactionalDataSourceSpringContextTests;
2010-03-15 13:21 3958import or ... -
Spring三种注入IOC注入方式
2010-03-10 09:46 6645Type1 接口注入 我们常常借助接口来将调用者与实现者分离 ... -
Spring中常用的hql查询方法(getHibernateTemplate())
2009-12-09 16:35 1008Spring中常用的hql查询方法(getHibernateT ... -
读Spring源代码之按图索骥(一)Context创建与配置文件加载
2009-12-07 13:57 1542Spring 和 Struts在web.xml中增加的配置 ... -
读Spring源代码之按图索骥(一)Context创建与配置文件加载
2009-12-07 13:56 1087Spring 和 Struts在web.xml中增加的配置 ... -
HTTP Status 404(The requested resource is not available)
2009-12-04 21:08 39247但是SSH中404不一定是以下错误! 是配置问题 HTTP S ... -
'dataSource': no matching editors or conversion strategy found
2009-12-04 19:42 3601the datasource property is look ... -
tomcat启动时出现的 严重: Error listenerStart
2009-12-04 16:15 1282最近看《WebWork.Spring.Hibernate 整 ... -
严重: Error filterStart-楼主竟然不给解决方案 = =
2009-12-04 16:14 2633今天在eclipse+myeclipse+tomcat5 ... -
org.springframework.web.filter.CharacterEncodingFilter 配置
2009-12-04 16:13 13818web.xml文件 <?xml version=&qu ... -
Spring2.0的包的说明
2009-12-04 16:12 1122Spring 压缩包目录说明 ... -
startup failed due to previous errors
2009-12-04 14:20 2621关键字: 异常,tomcat启动出错 ,xfire ,spri ... -
在使用SSH添加 <listener> <listener-class>org.springframework.web.context.C
2009-12-04 13:44 4331在使用SSH添加 <listener> ... -
ApplicationContext.xml
2009-12-03 16:22 1194<?xml version="1.0" ...
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"schema.zip"则是XML配置文件的模式定义,帮助开发者理解和验证自己的配置文件。 源码分析从以下几个关键模块入手: 1. **Core Container**:这是Spring框架的基础,包括BeanFactory和ApplicationContext接口,...
2. `META-INF`目录:包含Maven的配置信息,如`pom.xml`和`MANIFEST.MF`,这些文件描述了项目的依赖关系和元数据。 3. `src`目录:包含了源代码,可以导入Eclipse或其他IDE进行学习和分析。 在源码中,我们可以看到`...
在Spring Framework中,Spring Framework BOM(Bill of Materials)是一个Maven配置文件,它定义了Spring生态系统的各个模块的版本协调。这意味着,当你在你的项目中引入Spring Framework BOM,你可以确保所有Spring...
而`spring-5.2.8.RELEASE-schema.zip`则包含了Spring的XML配置文件的XSD规范,这对于理解Spring的配置方式至关重要。 Spring框架的核心模块包括: 1. **Core Container**(核心容器):这是Spring的基础,包括 ...
3. `org.springframework.boot.context.config.*`: 配置处理模块,用于读取和解析配置文件。 4. `org.springframework.boot.context.embedded.*`: 内嵌Web服务器的接口和实现。 5. `org.springframework.boot....
1. ApplicationContext:在Spring 1.0中,ApplicationContext是主要的上下文接口,负责加载配置文件,管理Bean,并提供事件发布等功能。它是所有其他Spring服务的基础。 2. BeanFactory:作为ApplicationContext的...
根据提供的文件信息,本次解读将围绕Spring框架的核心概念与源码分析进行展开。Spring框架作为Java企业级开发中不可或缺的一部分,其源码的学习对于深入理解框架机制、提高开发效率具有重要意义。下面,我们将从以下...
1. **ApplicationContext**:这是Spring的核心接口,负责初始化、加载配置文件,管理Bean的生命周期。源码中可以看到它是如何解析XML或Java配置,创建并管理Bean的。 2. **BeanFactory**:作为ApplicationContext的...
SpEL允许在配置文件或代码中动态地访问和修改对象属性,这对于依赖注入和条件逻辑的实现至关重要。 `spring-webmvc-4.2.4.RELEASE-sources`是Spring MVC的实现,它是Spring框架用于构建Web应用的核心模块。通过源码...
- **spring-framework-5.0.13.RELEASE-schema.zip**:包含了Spring XML配置文件的XML Schema定义,有助于理解配置文件的结构和约束。 四、源码阅读指南 1. **初始化流程**:从`org.springframework.context....
例如,`HadoopConfigUtils`类负责解析和加载Hadoop的配置文件,`HadoopConfigurationBeanFactoryPostProcessor`则用于在Spring容器启动时处理Hadoop配置。 2. **数据访问接口**:Spring Data Hadoop定义了一系列的...
本文将针对《spring-framework-3.2.x-for-eclipse.rar》这个压缩包文件,详细介绍如何在Eclipse开发环境中搭建Spring 3.2.x源码分析环境,并探讨其中的关键知识点。 首先,我们来看标题中的"spring-framework-3.2.x...
从提供的文件内容看,电子书《spring-cloud-config-server 源码电子书》可能涉及了Spring Cloud Config Server的关键组件和内部机制的源码分析。这部分内容专注于ConfigServerBootstrapApplicationListener类的实现...
本文将深入探讨如何通过源码分析来创建一个自定义的Spring Boot Starter,以`demo-spring-boot-starter`为例。 首先,我们了解Starter的基本结构。每个Starter通常包含以下组件: 1. **pom.xml**:这是Maven项目...
通过跟踪`refresh()`方法,可以了解如何加载和解析配置文件,以及如何初始化Bean。 - `AOP`相关的类,如`AbstractAdvisingBeanPostProcessor`和`ProxyCreator`,揭示了Spring如何通过代理模式实现AOP功能。 通过...