关于httpclient （java.lang.IllegalStateException）

多线程时使用httpclient-4.1.2.jar包的new DefaultHttpClient（）构造客户端报错！

Invalid use of SingleClientConnManager: connection still allocated.Make sure to release the connection before allocating another one.java.lang.IllegalStateException: Invalid use of SingleClientConnManager: connection still allocated.Make sure to release the connection before allocating another one....

解决办法：加上 new ThreadSafeClientConnManager()  即可解决该问题

HttpClient httpclient = new DefaultHttpClient(new ThreadSafeClientConnManager());