At the base of both examples, we used a buffer of a fixed size. Both of these ways demonstrated better performance in terms of speed and low memory consumption. Moreover, we can still improve the performance of these two ways by using larger buffers.
Because, larger buffers means lesser interactions with underlying files. However, larger buffers also means larger consumption of memory. To prove that we will rerun both of these examples with a buffer size of or 1MB. From both of the outputs above we can see a performance improvement, with a slightly more impact on the memory. The conclusion of this long practical comparison is that the best way of transferring a very large amount of data using Java IO is by using buffer. Copying the file in chunks helps to limit the amount of consumed memory consumed by the file content.
The advantage of using BufferedInputStream or FileChannel to read large files is that they have a configurable buffer. Thus, based on the nature of the server load, and size of the file we can control the buffer size and eventually find an optimal and the most efficient way to read large files in Java IO.
In this long and practical oriented tutorial we discussed Java Large File Processing. We began by understanding that we can speed up large file reads at the cost of memory consumption. Or Keep the memory utilisation to minimal by slowing down the processing. Finally, we concluded that the BufferedInputStream and the FileChannel are the optimal and most efficient ways to read and write very large files in Java IO.
The following assumes you want to throw exception if size is exceeded. Improve this answer. Andreas Andreas k 9 9 gold badges silver badges bronze badges. Add a comment. Second approach is checking the bytes according to specific encoding before writing it to file. Problems with both the approaches, Write and Check : You may end up with some extra bytes and file size may cross the limit Check and Write : You may have less bytes than the limit if next line has lot of data in it.
You should be careful about the encoding. Joop Eggen Joop Eggen k 7 7 gold badges 78 78 silver badges bronze badges. IIUC, there are various ways to do it. Keep writing data in chucks and flushing it and keep checking the file size after every flush. Use log4j or some logging framework which can let us rollover to new file after certain size or time or some other trigger point.
Fastest way to write huge data in text file Java. Community Bot 1 1 1 silver badge. Sanjeev Dhiman Sanjeev Dhiman 1, 1 1 gold badge 9 9 silver badges 20 20 bronze badges. Sign up or log in Sign up using Google. These methods use the platform's own notion of line separator rather than the newline character. I was doing close at the end of my program, but all the writing to the file was done in a for loop I didn't think of using the flush.
Unable to write to file using BufferedWriter Ask Question. Asked 7 years, 11 months ago. Active 7 years, 11 months ago. Viewed 2k times. Apparently my System. I need to write the Out to the File report. Improve this question. Stanley Mungai. Stanley Mungai Stanley Mungai 3, 26 26 gold badges 93 93 silver badges bronze badges. This writes Only the Last result Then use a StringBuffer and append values to it in the for loop and write it when for loop exits — Asfab. Add a comment. Active Oldest Votes.
Improve this answer. Toon Borgers Toon Borgers 3, 1 1 gold badge 13 13 silver badges 22 22 bronze badges.
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