spring, ApplicationContext，讀取bean、屬性、屬性值

ApplicationContext，讀取bean、屬性、屬性值，demo：

public class HutuAbstractTopicEventcode {

    private String              ctxPath    = "C:/happyday/demo.xml";

    private String              moduleName = "happybaby";

    public static void main(String[] args) {
        HutuAbstractTopicEventcode o = new HutuAbstractTopicEventcode();
        
        // 提取出所有topic/eventcode
        Map<String, Set<String>> topicEventcodes = o.abstractTopicEventcode();
        
        // 用於計數
        int count = 0;
        
        // 打印. 
        for(Map.Entry<String, Set<String>> entry : topicEventcodes.entrySet()){
            String topic = entry.getKey();
            Set<String> eventcodes = entry.getValue();
            for(String eventcode : eventcodes){
                System.err.println(topic + ", " + eventcode);
                count ++;
            }
        }
        System.err.println("共計: " + count);

    }

    /**
     * 從xml里提取出所有topic/eventcode，並轉化為map類型.
     * 
     * @return
     */
    @SuppressWarnings("unchecked")
    public Map<String/*topic*/, Set<String/*eventcode*/>> abstractTopicEventcode() {
        ApplicationContext context = new FileSystemXmlApplicationContext(ctxPath);
        //   ApplicationContext context = new ClassPathXmlApplicationContext(ctxPath);

        TopicMessageConfig newConfigObject = (TopicMessageConfig) context.getBean(moduleName);
        Set<String> attributeSet = this.getAttributeNames(newConfigObject);
        for (String attributeName : attributeSet) {
            System.err.println("屬性名稱" + attributeName);
            System.err.println("屬性值：" + this.getAttributeVlaue(newConfigObject, attributeName));
            return (Map<String, Set<String>>) this
                .getAttributeVlaue(newConfigObject, attributeName);
        }
        return null;
    }
    
    // ~~~ 內部方法 ~~~

    /**
     * 獲取該bean里的全部屬性名稱.
     * 
     * @param newConfigObject
     * @return
     */
    private Set<String> getAttributeNames(TopicMessageConfig newConfigObject) {
        PropertyDescriptor[] propertyDescriptors = BeanUtils.getBeanInfo(newConfigObject)
            .getPropertyDescriptors();
        Set<String> attributeNames = new HashSet<String>();
        for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
            if (!propertyDescriptor.getName().equals("class")) {
                if (propertyDescriptor.getReadMethod() != null
                    && propertyDescriptor.getWriteMethod() != null) {
                    attributeNames.add(propertyDescriptor.getName());
                }
            }
        }
        return attributeNames;
    }

    /**
     * 獲取該bean中，對應該屬性名的屬性值.
     * 
     * @param configObject
     * @param attributeName
     * @return
     */
    private Object getAttributeVlaue(Object configObject, String attributeName) {
        PropertyDescriptor[] propertyDescriptors = BeanUtils.getBeanInfo(configObject)
            .getPropertyDescriptors();
        for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
            if (propertyDescriptor.getName().equals(attributeName)) {
                try {
                    if (propertyDescriptor.getReadMethod() != null) {
                        return propertyDescriptor.getReadMethod().invoke(configObject);
                    }
                } catch (InvocationTargetException e) {
                    this.handleException("get", attributeName, e);
                } catch (IllegalAccessException e) {
                    this.handleException("get", attributeName, e);
                }

            }
        }
        return null;
    }

    /**
     * 處理異常.
     * 
     * @param opName
     * @param name
     * @param e
     */
    private void handleException(String opName, String name, Exception e) {
        StringBuilder buf = new StringBuilder();
        buf.append(opName).append("屬性失敗，moduleName:").append(this.moduleName);
        buf.append(", propertyName:").append(name);
        LOGGER.error(buf.toString(), e);
        throw new RuntimeException(buf.toString(), e);
    }

}