从java文件中删除一行 [英] Delete a line from a file in java

问题描述

好的，所以我试图用java删除文本文件中的行。目前我这样做的方式是跟踪行号和输入索引。索引是我想要删除的行。所以每次我读一行新的数据时，我都会增加行数。现在，当我达到的行数是相同的索引，我不写数据到临时文件。现在这个工作，但是如果我正在处理大文件，我不得不担心内存限制。我怎样才能做到这一点..文件标记？例如..将文件标记放在我想要删除的行上。那么删除那一行？或者这只是太多的工作？

解决方案

不要将文件保存在内存中，只需一次读取一行并将其写入临时文件一行一行跳过需要删除的行。

Ok, so I'm trying to delete lines from a text file with java. Currently the way I'm doing this, is I'm keep track of a line number and inputting an index. The index is the line I want deleted. So each time I read a new line of data I increment the line count. Now when I reach the line count that is the same index, I dont write the data to the temporary file. Now this works, but what if for example I'm working with huge files and I have to worry about memory restraints. How can I do this with.. file markers? For example.. place the file marker on the line I want to do delete. Then delete that line? Or is that just too much work?

解决方案

Don't keep the file in memory, just read it one line at a time and write it out to the temporary file one line at at a time skipping the line that needs to be deleted.

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