从分隔文件中删除第一行 [英] Remove first line from delimited file

问题描述

我有一个可以包含数百万条记录的分隔文件，现在我想从分隔文件中删除第一行，然后再处理它。

第一行的长度是可变的，它根据文件类型而不同。现在我已经对FileChannel和RandomAccessFile进行了读取，删除第一行的最佳方法。

但我无法弄清楚，如何得到第一行的长度并删除它。

解决方案

不要删除它，只要读取和忽略。您必须准备文件，因为文件处理单元无法处理具有不正确的第一行的文件，那么您必须读取并重写它。没有可用的I / O操作，可以从文件系统的文件中删除内容。

I have a delimited file which can contain around millions of records , now I want to delete the first line from the delimited file before processing it further.

The length of the first line is variable , it differs as per the file type.. now I have done a readup on the FileChannel and RandomAccessFile which have been suggested as the best ways to delete the first line.

But I am unable to figure it out , as to how to get the length of the first line and delete it.

解决方案

Don't delete it, just read-and-ignore.

If you have to prepare the file because the file processing units can't handle a file with an incorrect first line, then you'll have to read and rewrite it. There is no I/O operation available that can delete contents from file in the filesystem.

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