解决spring 注入ThreadPoolExecutor 构造歧义

出处http://stackoverflow.com/questions/6395388/error-creating-bean-cant-inject-a-new-linkedblockingqueue-as-a-constructor-to

这里的解决方法就是不直接注入 ThreadPoolExecutor,而是通过factoryBean注入

public class ThreadPoolExecutorFactory implements FactoryBean
{
private final ReentrantLock lock = new ReentrantLock();
private ThreadPoolExecutor executor;
private int corePoolSize;
private int maximumPoolSize;
private long keepAliveTime;
private TimeUnit unit;

public Object getObject()
{
lock.lock();
if (executor == null)
executor = new ThreadPoolExecutor(corePoolSize, maximumPoolSize,
keepAliveTime, unit, new LinkedBlockingQueue<Runnable>());
lock.unlock();
return executor;
}

public Class getObjectType()
{
return ThreadPoolExecutor.class;
}

public boolean isSingleton()
{
return true;
}
}

<bean name="executor" class="ThreadPoolExecutorFactory">
<constructor-arg value="1" />
<constructor-arg value="20" />
<constructor-arg value="60" />
<constructor-arg>
<bean class="java.util.concurrent.TimeUnit" factory-method="valueOf">
<constructor-arg value="SECONDS" />
</bean>
</constructor-arg>
</bean>

在程序中可以注入给ThreadPoolExecutor

@Autowired
@Qualifier(value = "executor")
ThreadPoolExecutor executor;