http://wenku.baidu.com/link?url=VLyZ7q86JNedXxwcPBQrYAX4jKjWGuxXYP9J_xIH4_fXZd1ZEMOXF_BQtdKwu-RPItWsCaiHz4_TOhyipm8bVcwsAmJzNrKHUBQ_xp3a_Ey
只能帮你找到一篇文章参考。