Java file reading and writing IO / NiO and performance comparison, detailed code and summary

After working in Java for so long, I have been working on web related projects, and some basic classes have almost been forgotten. I often want to pick it up, but I can't do it for some reasons.

In fact, it's not that I don't have time, but sometimes I'm tired of summarizing. I'm free today and make up my mind to pick up all the lost.

File reading and writing is often encountered in projects, sometimes because of maintenance, and sometimes because of new function development. Our task is always heavy and the pace of work is so fast that we can't stop to summarize.

There are several common methods for file reading and writing

1. Byte read / write (InputStream / OutputStream)

2. Character reading (FileReader / filewriter)

3. Row read (BufferedReader / bufferedwriter)

Code (take reading as an example):

//-----------------------------------------------------------------Split line-----------------------------------------------------------------------------

After the advice of two peers, I made some modifications to the file I wrote before, and tested the performance of each method by reading and writing a 1.2m text file. From the results of many tests, the line reading and writing is Java NiO is more efficient.

The modified code is as follows:

In the main method, after calling each method, there are five sets of data, which are the 5 times I read and write the test time (milliseconds).

About Java NiO please refer to: https://www.oudahe.com/p/45222/

Personal test:

summary

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