BlockingQueue的异常Queue full

生产异常日志：java.lang.IllegalStateException: Queue full

原因：当使用add方法的时候，队列满了，再放入元素，就会报这个异常

解决方法：将add方法替换成put方法，队列变成阻塞队列。

引用java doc：

BlockingQueue methods come in four forms, with different ways of handling operations that cannot be satisfied immediately, but may be satisfied at some point in the future: one throws an exception, the second returns a special value (either null or false, depending on the operation), the third blocks the current thread indefinitely until the operation can succeed, and the fourth blocks for only a given maximum time limit before giving up. These methods are summarized in the following table:

	Throws exception	Special value	Blocks	Times out
Insert	add(e)	offer(e)	put(e)	offer(e, time, unit)
Remove	remove()	poll()	take()	poll(time, unit)
Examine	element()	peek()	not applicable	not applicable