独占方式读文件的例子，重要是思路，实际测试读出内容与原文件有出入，原因目前我还不明白，大家搞清楚可以告知我，-Exclusive examples of reading a document, it is important is the idea of the actual test content read out differ　the original document, the reasons for the present I do not understand that everyone can find out tell me