在文本文件Java中编写大量数据的最快方法

Question

在文本文件Java中编写大量数据的最快方法我必须在text [csv]文件中写入大量数据。我使用BufferedWriter来写入数据，大约需要40秒来写入174 MB的数据。这是java提供的最快速度吗？bufferedWriter = new BufferedWriter ( new FileWriter ( "fileName.csv" ) );注意：这40秒包括迭代和从结果集中提取记录的时间。:)。174 MB是结果集中的400000行。

Answer 1

仅为了统计：

这台机器是旧戴尔的新SSD

CPU：Intel Pentium D 2,8 Ghz

SSD：Patriot Inferno 120GB SSD

4000000 'records'

175.47607421875 MB

Iteration 0

Writing raw... 3.547 seconds

Writing buffered (buffer size: 8192)... 2.625 seconds

Writing buffered (buffer size: 1048576)... 2.203 seconds

Writing buffered (buffer size: 4194304)... 2.312 seconds

Iteration 1

Writing raw... 2.922 seconds

Writing buffered (buffer size: 8192)... 2.406 seconds

Writing buffered (buffer size: 1048576)... 2.015 seconds

Writing buffered (buffer size: 4194304)... 2.282 seconds

Iteration 2

Writing raw... 2.828 seconds

Writing buffered (buffer size: 8192)... 2.109 seconds

Writing buffered (buffer size: 1048576)... 2.078 seconds

Writing buffered (buffer size: 4194304)... 2.015 seconds

Iteration 3

Writing raw... 3.187 seconds

Writing buffered (buffer size: 8192)... 2.109 seconds

Writing buffered (buffer size: 1048576)... 2.094 seconds

Writing buffered (buffer size: 4194304)... 2.031 seconds

Iteration 4

Writing raw... 3.093 seconds

Writing buffered (buffer size: 8192)... 2.141 seconds

Writing buffered (buffer size: 1048576)... 2.063 seconds

Writing buffered (buffer size: 4194304)... 2.016 seconds

我们可以看到raw方法缓慢缓慢。