java.lang.NullPointerException: Attempt to invoke virtual method 'void java.io.BufferedOutputStream.
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做项目的时候，突然出现
这个问题，仔细看了下 这个BufferedOutputStream 没有啥问题啊，最后才发现，在创建目录的时候，没有先进行判断目录是否存在，导致没有mkdir，最后导致BufferedOutputStream 并没有new 成功，所以才报错，大意，记录一下，提醒自己有些问题 可以看看前面是否写错
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