public class rpcmethodhelper implements applicationcontextaware { protected static final logger logger = loggerfactory.getlogger(rpcmethodhelper.class); protected applicationcontext appcontext; protected autowirecapablebeanfactory autowiringfactory; protected int autowirestrategy = autowirecapablebeanfactory.autowire_by_name; /** * 初始化action如果已经在spring中注册过则从spring容器中得到action实例， 如果spring容器中没有注册则先注册并返回实例 * 返回的action实例已经注入了依赖的其他对象及请求参数 * * @param <t> * @param clazz * @return */ protected <t> t createaction(class<t> clazz) { t action = null; string beanname = clazz.getname(); try { logger.debug("trying the application context... appcontext = {},\n bean name = {}" ,appcontext,beanname); action = clazz.cast(appcontext.getbean(beanname));//先从spring容器中得到bean } catch (nosuchbeandefinitionexception e) { //如果spring容器中没有注册则先注册并返回实例 logger.debug("did not find bean definition for bean named {}, creating a new one...",beanname); if (autowiringfactory instanceof beandefinitionregistry) { beandefinitionregistry registry = (beandefinitionregistry) autowiringfactory; rootbeandefinition def = new rootbeandefinition(clazz, autowirestrategy);//设置autowire策略,根据具体应用来决定 // def.setsingleton(false); def.setscope("prototype");//这里的scope类型可以根据需要设置 logger.debug("registering a new bean definition for class " + beanname); registry.registerbeandefinition(beanname, def); try { action = clazz.cast(appcontext.getbean(beanname)); } catch (nosuchbeandefinitionexception e2) { logger.warn("could not register new bean definition for bean {}" ,beanname); } } } return action; } public void setapplicationcontext(applicationcontext context) throws beansexception { appcontext = context; autowiringfactory = findautowiringbeanfactory(this.appcontext); } /** * * @see com.opensymphony.xwork2.spring.springobjectfactory#findautowiringbeanfactory * @param context */ protected autowirecapablebeanfactory findautowiringbeanfactory( applicationcontext context) { if (context instanceof autowirecapablebeanfactory) { // check the context return (autowirecapablebeanfactory) context; } else if (context instanceof configurableapplicationcontext) { // try and grab the beanfactory return ((configurableapplicationcontext) context).getbeanfactory(); } else if (context.getparent() != null) { // and if all else fails, try again with the parent context return findautowiringbeanfactory(context.getparent()); } return null; } /** * sets the autowiring strategy * * @see com.opensymphony.xwork2.spring.springobjectfactory#setautowirestrategy * @param autowirestrategy */ public void setautowirestrategy(int autowirestrategy) { switch (autowirestrategy) { case autowirecapablebeanfactory.autowire_autodetect: logger.info("setting autowire strategy to autodetect"); this.autowirestrategy = autowirestrategy; break; case autowirecapablebeanfactory.autowire_by_name: logger.info("setting autowire strategy to name"); this.autowirestrategy = autowirestrategy; break; case autowirecapablebeanfactory.autowire_by_type: logger.info("setting autowire strategy to type"); this.autowirestrategy = autowirestrategy; break; case autowirecapablebeanfactory.autowire_constructor: logger.info("setting autowire strategy to constructor"); this.autowirestrategy = autowirestrategy; break; default: throw new illegalstateexception("invalid autowire type set"); } }}
使用方式：
1.上面的rpcmethodhelper本身也应该配置到spring容器中
<bean id="rpcmethodhelper" class="com.niagara.rpc.rpcmethodhelper"></bean>
2.如果不想将上面的类配置为spring bean，那只要在工具类中得到applicationcontext的引用即可。