Spring一些杂七杂八的东西

要解决的问题：

@RequestHeader annotation for MVC handler methods
@PathVariable annotation for MVC handler methods
@Value annotation for embedded expression support
introduced @CookieValue annotation for Servlet and Portlet MVC handler methods
introduced @ExceptionHandler annotation for used in annotated web controllers

@Transactional supports qualifier value for choosing between multiple transaction managers
猜想使用方法是两个注解一块使用，当有多个事务管理器时，通过qualifier注解来限定，只有bean的id为指定id的才可以。
@Transactional
@Qualifier("bean的名字")
added TxAnnotationDriven, MvcAnnotationDriven, etc. as out-of-the-box FeatureSpecifications
Spring 3.1的缓存相关的注解? @Cacheable、@CachePut、@CacheEvict? <cache:advice>

综合的
@Configuration
@RequestPart
新产物RedirectAttributes
@RequestMapping(value = "/", method = RequestMethod.POST, consumes="application/json")
@RequestMapping(value = "/", method = RequestMethod.POST, produces="application/json")

如果随机随地取得spring容器管理的bena：

Spring容器在启动时，如果被Spring管理的Bean实现了ApplicationContextAware接口，那么会自动调用ApplicationContextAware接口中的

public void setApplicationContext(ApplicationContext context) throws BeansException

方法，向其传递ApplicationContext 对象。有了ApplicationContext 对象就可以取得所有的Spring管理的bean了。

我试过了，在双亲上下文环境上，可OK。这对于spring 3 MVC很重要。

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配置文件：

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Demo:
//这段代码转自itEye上一位叫chenxin的朋友的Demoimport org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;/** * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候中取出ApplicaitonContext. *  */public class SpringContextHolder implements ApplicationContextAware {private static ApplicationContext applicationContext;/** * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量. */public void setApplicationContext(ApplicationContext applicationContext) {SpringContextHolder.applicationContext = applicationContext; // NOSONAR}/** * 取得存储在静态变量中的ApplicationContext. */public static ApplicationContext getApplicationContext() {checkApplicationContext();return applicationContext;}/** * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型. */@SuppressWarnings("unchecked")public static <T> T getBean(String name) {checkApplicationContext();return (T) applicationContext.getBean(name);}/** * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型. */@SuppressWarnings("unchecked")public static <T> T getBean(Class<T> clazz) {checkApplicationContext();return (T) applicationContext.getBeansOfType(clazz);}/** * 清除applicationContext静态变量. */public static void cleanApplicationContext() {applicationContext = null;}private static void checkApplicationContext() {if (applicationContext == null) {throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder");}}}
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