我有一个如下列表:
ArrayList<DiameterMessageHandler> handlers = new ArrayList<>();
handlers.add(new AARHandler());
handlers.add(new CERHandler());
handlers.add(new PPAHandler());
handlers.add(new STRHandler());
handlers.add(new DWRHandler());
我想知道如何创建一个将处理程序作为其参数之一的spring bean,即是否可以在applicationContext.xml中执行此操作 - 我是否必须为列表和每个处理程序创建单独的bean( AARHandler等)先?这是我的applicationContext.xml
<bean id="DiameterClient" class="com.rory.ptspsim.diameterclient.DiameterClient" scope="singleton" init-method="start">
<constructor-arg type="java.lang.String" index="0"><value>${pcca.host}</value></constructor-arg>
<constructor-arg index="1">WHAT GOES HERE?</constructor-arg>
</bean>
答案 0 :(得分:37)
也许您希望所有这些处理程序都是Spring bean。这是配置:
<bean id="DiameterClient" class="com.rory.ptspsim.diameterclient.DiameterClient" init-method="start">
<constructor-arg value="${pcca.host}" />
<constructor-arg>
<list>
<ref bean="aarHandler" />
...
</list>
</constructor-arg>
</bean>
<bean id="aarHandler" class="com.rory.ptspsim.diameterclient.AARHandler" />
答案 1 :(得分:7)
我认为最合适的方法是:
<bean id="DiameterClient" class="com.rory.ptspsim.diameterclient.DiameterClient" scope="singleton" init-method="start">
<constructor-arg type="java.lang.String" index="0"><value>${pcca.host}</value></constructor-arg>
<constructor-arg index="1">
<list>
<ref bean="aarHandler" />
<ref bean="cerHandler" />
<ref bean="ppaHandler" />
<ref bean="strHandler" />
<ref bean="dwrHandler" />
</list>
</constructor>
</bean>
答案 2 :(得分:7)
如果您想要所有可用的处理程序,Spring还将通过自动装配为您收集:
public DiameterClient(@Autowired List<DiameterMessageHandler> handlers){
this.handlers = handlers;
}
现在Spring将注入所有可用处理程序的列表。
答案 3 :(得分:2)
<bean id="DiameterClient" class="com.rory.ptspsim.diameterclient.DiameterClient" scope="singleton" init-method="start">
<constructor-arg type="java.lang.String" index="0"><value>${pcca.host}</value></constructor-arg>
<constructor-arg index="1">
<list>
<bean class="AARHandler"/>
<bean class="CERHandler"/>
</list>
</constructor-arg>
</bean>
答案 4 :(得分:1)
<list> <ref bean="handler1" /> <ref bean="handler2" /> <ref bean="handler3" /> <ref bean="handler4" /> <ref bean="handler5" /> </list> <bean id="handler1" class="AARHandler"/> <bean id="handler2" class="CERHandler"/> <bean id="handler3" class="PPAHandler"/> <bean id="handler4" class="STRHandler"/> <bean id="handler5" class="DWRHandler"/>