功能就是说按文件每行读取
直至读完为止
程序理解是：
bytes = in.read(bteFile)是个赋值语句
bytes最终就是in.read(bteFile)的值
in.read(bteFile)读到最后一行没有数据时返回-1
所以bytes就等于-1了
而bytes != -1是判断语句 判断是否读完文件
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也就是读文件常用的写法是这样
平时不建议这么写
程序可读性不好
这段WHILE语句怎么理解?while ((bytes = in.read(bteFile)) != -1){out.w
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