Karaf参考不是注入参考对象。请参阅我的设置和代码。
版本:apache-karaf-3.0.5
第1部分:服务类
package org.jrb.test;
public interface MyService
{
String echo(String message);
}
package org.jrb.test;
public class MyServiceImpl implements MyService
{
public String echo(String message)
{
return "Echo processed: " + message;
}
}
<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" default-activation="lazy">
<bean id="serviceBean" class="org.jrb.test.MyServiceImpl"/>
<service id="MyService" ref="serviceBean" interface="org.jrb.test.MyService"/>
</blueprint>
onos&GT;服务:列表| grep serviceBean
osgi.service.blueprint.compname = serviceBean
第2部分:用于测试的消费者类
<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" default-activation="lazy">
<reference id="MyService" interface="org.jrb.test.MyService"/>
<bean id="b" class="org.ct.command.AddCommand" activation="eager" >
<property name="serviceBn" ref="MyService" />
</bean>
<command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.1.0">
<command>
<action class="org.ct.command.AddCommand"/>
</command>
</command-bundle>
</blueprint>
package org.ct.command;
import org.apache.felix.gogo.commands.Action;
import org.apache.felix.gogo.commands.Argument;
import org.apache.felix.gogo.commands.Command;
import org.apache.felix.service.command.CommandSession;
import org.jrb.test.MyService;
@Command(scope = "onos", name = "service-add", description = "Adds a Client")
public class AddCommand implements Action
{
private MyService serviceBn;
public void setServiceBn(MyService serviceBn)
{
this.serviceBn = serviceBn;
}
public MyService getServiceBn()
{
return service;
}
@Override
public Object execute(CommandSession session) throws Exception
{
System.out.println("Executing command add");
if (serviceBn != null) {
System.out.println("serviceBn is not null");
System.out.println(serviceBn.echo("testing....."));
} else {
System.out.println("serviceBn is null !!");
}
}
}
在上面的代码中,如果我运行命令&#34; service-add&#34;,我的serviceBn
始终是null
。引用不是注入bean。
我的代码中是否有任何遗漏?
答案 0 :(得分:1)
也许你可以使用不同的方法。在将AddCommand构造为Blueprint bean时,可以将MyService对象作为构造函数参数提供:
@Command(scope = "onos", name = "service-add", description = "Adds a Client")
public class AddCommand implements Action
{
private MyService serviceBn;
public AddCommand(MyService myService) {
this.serviceBn = myService;
}
...
}
在蓝图中,您可以指定:
...
<reference id="MyService" interface="org.jrb.test.MyService"/>
<bean id="b" class="org.ct.command.AddCommand" activation="eager" >
<argument ref="MyService" />
</bean>
...
在我们的项目中,我们更喜欢这种注入物业的方法。
<强>更新强>
使用当前蓝图,创建了两个实例。 bean是单独创建的实例。
要将服务注入命令,您可以尝试这样的事情:
<reference id="MyService" interface="org.jrb.test.MyService" availability="mandatory" />
<command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.1.0">
<command name="service:add">
<action class="org.ct.command.AddCommand">
<property name="serviceBn" ref="MyService"/>
</action>
</command>
</command-bundle>