发生异常，先得多加点log来分析你代码跑到哪里了
http://blog.csdn.net/simplicitylife/article/details/6289466http://zhidao.baidu.com/link?url=5CZupKSTjOaTVksAsR22Ym-r9YIghfG3K5MytCTFNFx1PEkEvH3ckAOWUMt-bTGWjjCXkjv7cD9PEeGXe3dLUahttp://www.docin.com/p-107213387.html
