http://wenku.baidu.com/link?url=L8zZBKrbHF3xUW7FGsr1YHmDuWnpIpQGI_nbIeUAQjvSQSiKkhEIWSjEnIyoJ1MwRSu-vqJ78R2n9GE6MjVvOgkJ7lLdHiSKvoB1L2-WiyO  这里面有解决方法