java tip : 파일을 가장 빨리 읽는 방법 / 효과적인 방법

 

파일 크기, 단일 파일/복수개 파일 등 조건별 차이가 있겠지만,

다음과 같은 검색어 결과로 여러 개발자/경험자들의 검토 의견을 참고해보자

    "What is the fastest way to read a large file in Java"

    "How to Read a Large File Efficiently with Java"

    "How to read files quickly with java"

 

 

몇 가지만 적어두자..

 

2008/02/24 How to read files quickly

    http://nadeausoftware.com/articles/2008/02/java_tip_how_read_files_quickly

Conclusions For the best Java read performance, there are four things to remember: Minimize I/O operations by reading an array at a time, not a byte at a time. An 8Kbyte array is a good size. Minimize method calls by getting data an array at a time, not a byte at a time. Use array indexing to get at bytes in the array. Minimize thread synchronization locks if you don't need thread safety. Either make fewer method calls to a thread-safe class, or use a non-thread-safe class like FileChannel and MappedByteBuffer. Minimize data copying between the JVM/OS, internal buffers, and application arrays. Use FileChannel with memory mapping, or a direct or wrapped array ByteBuffer.

 

Ultimate Guide for Reading Files in Java

    https://funnelgarden.com/java_read_file/

How to Read Text and Binary Files in Java (ULTIMATE GUIDE)

 

 

 

2018/04/09 How do I read a large file quickly in Java?

    https://www.quora.com/How-do-I-read-a-large-file-quickly-in-Java

How do I read a large file quickly in Java?

 

 

2019/03/06 Java NIO FileChannel vs FileOutputstream 성능/유용성

    https://codeday.me/ko/qa/20190306/9122.html

Java NIO FileChannel 대 FileOutputstream 성능/유용성 - 코드 로그

 

https://stackoverflow.com/questions/19486077/java-fastest-way-to-read-through-text-file-with-2-million-lines

Java Fastest way to read through text file with 2 million lines