如何从枚举单例的工厂方法创建春豆

Question

我正在尝试将这里的示例代码弹出

http://xeiam.com/xchange_examplecode.jsp

  public static void main(String[] args) {
    // Demonstrate the public market data service
    // Use the factory to get the version 2 MtGox exchange API using default settings
    Exchange mtGoxExchange = ExchangeFactory.INSTANCE.createExchange(MtGoxExchange.class.getName());
    // Interested in the public market data feed (no authentication)
    PollingMarketDataService marketDataService = mtGoxExchange.getPollingMarketDataService();

基本上，我希望注入PollingMarketDataService或Exchange作为一个spring bean。

然而，上面的ExchangeFactory是一个enum，当我尝试这个:

<beans:bean id="exchangeFactory" class="com.xeiam.xchange.ExchangeFactory" factory-method="valueOf">
    <beans:constructor-arg value="INSTANCE"/>
</beans:bean>
<beans:bean id="mtGoxExchange" factory-bean="exchangeFactory" factory-method="createExchange">
    <beans:constructor-arg value="com.xeiam.xchange.mtgox.v2.MtGoxExchange"/>
</beans:bean>

Answer 1

这应该可以工作:

<util:constant id="exchangeFactory" static-field="com.xeiam.xchange.ExchangeFactory.INSTANCE" />
<bean id="mtGoxExchange" factory-bean="exchangeFactory" factory-method="createExchange">
    <constructor-arg value="com.xeiam.xchange.mtgox.v2.MtGoxExchange" />
</bean>

试一试