WebApplicationContextUtils源码
package org.springframework.web.context.support; import javax.servlet.ServletContext; import javax.servlet.ServletRequest; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.springframework.beans.factory.ObjectFactory; import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; import org.springframework.util.Assert; import org.springframework.web.context.WebApplicationContext; import org.springframework.web.context.request.RequestAttributes; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.RequestScope; import org.springframework.web.context.request.ServletRequestAttributes; import org.springframework.web.context.request.SessionScope; public abstract class WebApplicationContextUtils { public static WebApplicationContext getRequiredWebApplicationContext(ServletContext sc) throws IllegalStateException { WebApplicationContext wac = getWebApplicationContext(sc); if (wac == null) { throw new IllegalStateException("No WebApplicationContext found: no ContextLoaderListener registered?"); } return wac; } public static WebApplicationContext getWebApplicationContext(ServletContext sc) { return getWebApplicationContext(sc, WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE); } public static WebApplicationContext getWebApplicationContext(ServletContext sc, String attrName) { Assert.notNull(sc, "ServletContext must not be null"); Object attr = sc.getAttribute(attrName); if (attr == null) { return null; } if ((attr instanceof RuntimeException)) { throw ((RuntimeException)attr); } if ((attr instanceof Error)) { throw ((Error)attr); } if ((attr instanceof Exception)) { IllegalStateException ex = new IllegalStateException(); ex.initCause((Exception)attr); throw ex; } if (!(attr instanceof WebApplicationContext)) { throw new IllegalStateException("Context attribute is not of type WebApplicationContext: " + attr); } return (WebApplicationContext)attr; } public static void registerWebApplicationScopes(ConfigurableListableBeanFactory beanFactory) { beanFactory.registerScope("request", new RequestScope()); beanFactory.registerScope("session", new SessionScope(false)); beanFactory.registerScope("globalSession", new SessionScope(true)); beanFactory.registerResolvableDependency(ServletRequest.class, new ObjectFactory() { public Object getObject() { RequestAttributes requestAttr = RequestContextHolder.currentRequestAttributes(); if (!(requestAttr instanceof ServletRequestAttributes)) { throw new IllegalStateException("Current request is not a servlet request"); } return ((ServletRequestAttributes)requestAttr).getRequest(); } }); beanFactory.registerResolvableDependency(HttpSession.class, new ObjectFactory() { public Object getObject() { RequestAttributes requestAttr = RequestContextHolder.currentRequestAttributes(); if (!(requestAttr instanceof ServletRequestAttributes)) { throw new IllegalStateException("Current request is not a servlet request"); } return ((ServletRequestAttributes)requestAttr).getRequest().getSession(); } }); } }
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