Java export method for generating CSV file

First of all, we need to have a basic understanding of CSV files. CSV files are similar to excel and can be opened with Excel, but the essence of CSV files is comma separated. The comparison is as follows:

Txt:

After modifying the file suffix to CSV, it is displayed as follows:

In Java, we generally use POI to operate excel. Import and export are OK, but POI consumes a lot of memory, especially when exporting. At this time, we can choose to export to generate CSV files, because it is similar to text, so the efficiency is very high.

An implementation class is simply written, and the code is as follows:

The test classes are as follows:

The file generated after export is the same as the above figure. It can be regarded as a package. It can be passed into the header and the attributes of the entity corresponding to the header. Pay attention to one-to-one correspondence.

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