别装了，难道说你们不想把properties直接注入到object中去（spring-plugin）

@Service("userService")
public class UserServiceImpl extends BaseServiceSupport implements UserService {

	public void xxx() {

	}
}

<context:component-scan base-package="xxxxxxx"/>

<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>classpath:jdbc.properties</value>
			</list>
		</property>
	</bean>	

@Service
public class ImageFileUpload implements Serializable {

    @Properties(name="pic.address" )
    private String picAddress;

    @Properties(name="pic.url" )
    private String picUrl;

    private String picServerUrl;
}

/**
 * @author ahuaxuan(aaron zhang)
 * @since 2008-4-7
 * @version $Id: Properties.java 261 2008-04-07 07:03:41Z aaron $
 */
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME) 
public @interface Properties {

//	String bundle();
	
	String name();
}

/**
 * @author ahuaxuan(aaron zhang)
 * @since 2008-4-7
 * @version $Id: AnnotationBeanPostProcessor.java 260 2008-04-07 07:03:35Z aaron $
 */
public class AnnotationBeanPostProcessor extends PropertyPlaceholderConfigurer implements BeanPostProcessor, InitializingBean {

	private static transient Log logger = LogFactory.getLog(AnnotationBeanPostProcessor.class);
	
	private java.util.Properties pros;
	
	@SuppressWarnings("unchecked")
	private Class[] enableClassList = {String.class};
	
	@SuppressWarnings("unchecked")
	public void setEnableClassList(Class[] enableClassList) {
		this.enableClassList = enableClassList;
	}

	public Object postProcessAfterInitialization(Object bean, String beanName)
			throws BeansException {
		
		Field [] fields = bean.getClass().getDeclaredFields();
		
		for (Field field : fields) {
			if (logger.isDebugEnabled()) {
				StringBuilder sb = new StringBuilder();
				sb.append(" ========= ")
					.append(field.getType())
					.append(" ============ ")
					.append(field.getName())
					.append(" ============ ")
					.append(field.isAnnotationPresent(Properties.class));
				
				logger.debug(sb.toString());
			}
			
			if (field.isAnnotationPresent(Properties.class)) {
				if (filterType(field.getType().toString())) {
					Properties p = field.getAnnotation(Properties.class);
					try {
//						StringBuilder sb = new StringBuilder();
//						sb.append("set").append(StringUtils.upperCase(field.getName().substring(0, 1)))
//										.append(field.getName().substring(1, field.getName().length()));
//						
//						Method method = bean.getClass().getMethod(sb.toString(), String.class);
//						method.invoke(bean, pros.getProperty(p.name()));
本来我是通过set方法来把properties文件中的值注入到对应的属性上去的，后来downpour提供了更好的方案，就是下面这两行代码，虽然这样做破坏了private的功能，同时破坏了封装，但是确实节省了很多代码，建议大家在业务代码中不要这样做，如果做框架代码可以考虑一下。

						ReflectionUtils.makeAccessible(field);
						field.set(bean, pros.getProperty(p.name()));
					} catch (Exception e) {
						logger.error(" --- ", e);
					} 
				}
			}
		}
		
		
		return bean;
	}
	
	@SuppressWarnings("unchecked")
	private boolean filterType(String type) {
		
		if (type != null) {
			for (Class c : enableClassList) {
				if (c.toString().equals(type)) {
					return true;
				}
			}
			
			return false;
		} else {
			return true;
		}
	}

	public Object postProcessBeforeInitialization(Object bean, String beanName)
			throws BeansException {
		return bean;
	}

	public void afterPropertiesSet() throws Exception {
		pros = mergeProperties();
	}
}

<bean id="propertyConfigurer"
		class="xx.service.AnnotationBeanPostProcessor">
		<property name="locations">
			<list>
				<value>classpath:jdbc.properties</value>
			</list>
		</property>
	</bean>

@Component
public class Config implements Serializable{

	/**  */
	private static final long serialVersionUID = 8737228049639915113L;

	@Properties(name = " online.pay.accounts")
	private String accounts;
	
	@Properties(name = " online.pay.user")
	private String user;
	
	@Properties(name = " online.pay.password")
	private String password;
	
	@Properties(name = " online.transurl")
	private String transUrl;
	
	@Properties(name = " online.refundurl")
	private String refundUrl;
	
	@Properties(name = " online.query")
	private String queryUrl;

	```setter and getter method
}

@Service(“userService”)
public class UserServiceImpl implements UserService {
	@autowired
	private Config config;

	public void setConfig(Config config) {
		This.config = config;
	}
}

24 楼 lsy 2008-05-07  

个人感觉还是喜欢在配置文件里面写${},因为这些全局的设置写在XML里面，很容易找到哪些bean用了这些properties，以后维护修改也不涉及修改代码。反过来如果用annotation，那么对于一个刚接触项目的人，如果他没找到Config就茫然了。（Config配置VO应该很好找，这里只是举个例子 ）

accounts=xxx
user=xxx
password=xxx

accounts=xxx
user=xxx
password=xxx