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详解spring controller autowired request变量
spring的di大家比较熟悉了,对于依赖注入的实现也无须赘述。
那么spring的bean的默认scope为singleton,对于controller来说每次方法中均可以获得request还是比较有意思的。
对于方法参数上的request通过构建方法的参数可以获得最新的request
public final object invokeforrequest(nativewebrequest request, modelandviewcontainer mavcontainer, object... providedargs) throws exception { object[] args = getmethodargumentvalues(request, mavcontainer, providedargs); if (logger.istraceenabled()) { stringbuilder sb = new stringbuilder("invoking ["); sb.append(getbeantype().getsimplename()).append("."); sb.append(getmethod().getname()).append("] method with arguments "); sb.append(arrays.aslist(args)); logger.trace(sb.tostring()); } object returnvalue = invoke(args); if (logger.istraceenabled()) { logger.trace("method [" + getmethod().getname() + "] returned [" + returnvalue + "]"); } return returnvalue; }
2. 对于controller等单实例变量来说如何动态注入变量呢?spring使用了很聪明的办法
/** * register web-specific scopes ("request", "session", "globalsession", "application") * with the given beanfactory, as used by the webapplicationcontext. * @param beanfactory the beanfactory to configure * @param sc the servletcontext that we're running within */ public static void registerwebapplicationscopes(configurablelistablebeanfactory beanfactory, servletcontext sc) { beanfactory.registerscope(webapplicationcontext.scope_request, new requestscope()); beanfactory.registerscope(webapplicationcontext.scope_session, new sessionscope(false)); beanfactory.registerscope(webapplicationcontext.scope_global_session, new sessionscope(true)); if (sc != null) { servletcontextscope appscope = new servletcontextscope(sc); beanfactory.registerscope(webapplicationcontext.scope_application, appscope); // register as servletcontext attribute, for contextcleanuplistener to detect it. sc.setattribute(servletcontextscope.class.getname(), appscope); } beanfactory.registerresolvabledependency(servletrequest.class, new requestobjectfactory()); beanfactory.registerresolvabledependency(httpsession.class, new sessionobjectfactory()); beanfactory.registerresolvabledependency(webrequest.class, new webrequestobjectfactory()); if (jsfpresent) { facesdependencyregistrar.registerfacesdependencies(beanfactory); } }
/** * factory that exposes the current request object on demand. */ @suppresswarnings("serial") private static class requestobjectfactory implements objectfactory<servletrequest>, serializable { public servletrequest getobject() { return currentrequestattributes().getrequest(); } @override public string tostring() { return "current httpservletrequest"; } }
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