记录一次使用OpenCsv导入大数据量报错的问题

导入100W的Csv数据，使用OpenCsv解析工具解析Csv，发现报错

报错内容

com.opencsv.exceptions.CsvMalformedLineException: Unterminated quoted field at end of CSV line. Beginning of lost text: [XXXXX...]
	at com.opencsv.CSVReader.readNext(CSVReader.java:355) ~[opencsv-4.6.jar!/:na]

解析代码

CSVParser csvParser = new CSVParserBuilder().build();
try (CSVReader readerCsv = new CSVReaderBuilder(new InputStreamReader(csv)).withCSVParser(csvParser).build()) {
    String[] lines;
    while ((lines = readerCsv.readNext()) != null) {
        doRead(lines);
    }
} catch (CsvValidationException e) {
    throw new IOException(e);
}

报错位置发生在英文逗号处，一开始怀疑是英文逗号解析问题
Csv 文本报错位置

"XXXXX\","XXXXX"
......
"2018-04-28 00:40:43","xxx,XXXXX"

去掉当前位置英文逗号导入仍旧失败
后来查看源码发现默认的 CSVParser 会对反斜杠""进行处理

这导致了解析Csv逻辑与源文件不同
后来使用了 RFC4180Parser 问题解决

RFC4180Parser rfc4180Parser = new RFC4180ParserBuilder().build();
try (CSVReader readerCsv = new CSVReaderBuilder(new InputStreamReader(csv)).withCSVParser(rfc4180Parser).build()) {
    String[] lines;
    while ((lines = readerCsv.readNext()) != null) {
        doRead(lines);
    }
} catch (CsvValidationException e) {
    throw new IOException(e);
}

参考文档：（RFC4180标准文档）https://datatracker.ietf.org/doc/html/rfc4180