把Spring容器中的bean绑定到通过代码创建的对象
Spring提供了对配置中创建对象的字段实例注入。但如果是通过代码创建或者动态创建的对象，由于不受Spring管理，因此没有机会执行字段实例的注入。Google了一把，没发现可以用的方法。因此只能写了一小段代码。对于这种情况，可以通过反射的方式找到对象的字段和方法定义，并注入之。以下为具体实现。Registry类保存了Spring生成的context，在需要的时候随时可以调用。
public final class Registry{ private Registry() {} private static ApplicationContext context; public static void setApplicationContext(ApplicationContext context) { Registry.context = context; } public static <T> T getBean(String configName, Class<T> cls) { return getBean(configName, cls, null); } public static <T> T getBean(String configName, Class<T> cls, T defaultValue) { assert (context != null); T value = context.getBean(configName, cls); return (value != null) ? value : defaultValue; } public static void wire(Object o) { wire(o, o.getClass()); } private static void wire(Object o, Class<?> cls) { Field[] fields = cls.getDeclaredFields(); for (Field field : fields) { Autowired autowired = field.getAnnotation(Autowired.class); if (autowired != null) { Class<?> fieldClass = field.getDeclaringClass(); Object bean = context.getBean(fieldClass); if (bean != null) { field.setAccessible(true); try { field.set(o, bean); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } Method[] methods = cls.getDeclaredMethods(); for (Method method : methods) { Autowired autowired = method.getAnnotation(Autowired.class); if (autowired != null) { Class<?>[] paramTypes = method.getParameterTypes(); if (paramTypes.length == 1) { Object bean = context.getBean(paramTypes[0]); if (bean != null) { method.setAccessible(true); try { method.invoke(o, bean); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } } } } } Class<?> superCls = cls.getSuperclass(); if (!superCls.equals(Object.class)) { wire(o, superCls); } } public static void stopContext() { assert (context != null); ((Lifecycle) context).stop(); }}