java - 使用带引号的字段内的双引号使用 OpenCSV 解析 CSV

Question

我正在尝试使用 OpenCSV 解析 CSV 文件。其中一列以 YAML 序列化格式存储数据并被引用，因为它可以在其中包含逗号。它里面也有引号，所以它可以通过放置两个引号来转义。我可以在 Ruby 中轻松解析此文件，但使用 OpenCSV 我无法完全解析它。它是一个 UTF-8 编码的文件。

这是我试图读取文件的 Java 片段

CSVReader reader = new CSVReader(new InputStreamReader(new FileInputStream(csvFilePath), "UTF-8"), ',', '\"', '\\');

这是该文件中的 2 行。第一行没有被正确解析并且在 ""[Fair Trade Certified]"" 处被拆分因为我猜是转义双引号。

1061658767,update,1196916,Product,28613099,Product::Source,"---
product_attributes:
-
- :name: Ornaments
  :brand_id: 49120
  :size: each
  :alcoholic: false
  :details: ""[Fair Trade Certified]""
  :gluten_free: false
  :kosher: false
  :low_fat: false
  :organic: false
  :sugar_free: false
  :fat_free: false
  :vegan: false
  :vegetarian: false
",,2015-11-01 00:06:19.796944,,,,,,
1061658768,create,,,28613100,Product::Source,"---
product_id:
retailer_id:
store_id:
source_id: 333790
locale: en_us
source_type: Product::PrehistoricProductDatum
priority: 1
is_definition:
product_attributes:
",,2015-11-01 00:06:19.927948,,,,,,

Answer 1

首先，我很高兴 FastCSV 为您工作，但我运行了可疑的子字符串并通过 3.9 openCSV 运行它，并且它与 CsvParser 和 RFC4180Parser 一起使用。您能否详细说明它如何不解析和/或使用 3.9 openCSV 进行尝试，以查看您是否遇到相同的问题，然后尝试使用以下配置。

以下是我使用的测试:

CSV解析器:

@Test
public void parseBigStringFromStackOverflowWithMultipleQuotesInLine() throws IOException {

    String bigline = "28613099,Product::Source,\"---\n" +
            "product_attributes:\n" +
            "-\n" +
            "- :name: Ornaments\n" +
            "  :brand_id: 49120\n" +
            "  :size: each\n" +
            "  :alcoholic: false\n" +
            "  :details: \"\"[Fair Trade Certified]\"\"\n" +
            "  :gluten_free: false\n" +
            "  :kosher: false\n" +
            "  :low_fat: false\n" +
            "  :organic: false\n" +
            "  :sugar_free: false\n" +
            "  :fat_free: false\n" +
            "  :vegan: false\n" +
            "  :vegetarian: false\n" +
            "\",,2015-11-01 00:06:19.796944";

    String suspectString = "---\n" +
            "product_attributes:\n" +
            "-\n" +
            "- :name: Ornaments\n" +
            "  :brand_id: 49120\n" +
            "  :size: each\n" +
            "  :alcoholic: false\n" +
            "  :details: \"[Fair Trade Certified]\"\n" +
            "  :gluten_free: false\n" +
            "  :kosher: false\n" +
            "  :low_fat: false\n" +
            "  :organic: false\n" +
            "  :sugar_free: false\n" +
            "  :fat_free: false\n" +
            "  :vegan: false\n" +
            "  :vegetarian: false\n" ;

    StringReader stringReader = new StringReader(bigline);

    CSVReaderBuilder builder = new CSVReaderBuilder(stringReader);
    CSVReader csvReader = builder.withFieldAsNull(CSVReaderNullFieldIndicator.BOTH).build();

    String item[] = csvReader.readNext();

    assertEquals(5, item.length);
    assertEquals("28613099", item[0]);
    assertEquals("Product::Source", item[1]);
    assertEquals(suspectString, item[2]);
}

RFC4180解析器

def 'parse big line from stackoverflow with complex string'() {
    given:
    RFC4180ParserBuilder builder = new RFC4180ParserBuilder()
    RFC4180Parser parser = builder.build()
    String bigline = "28613099,Product::Source,\"---\n" +
            "product_attributes:\n" +
            "-\n" +
            "- :name: Ornaments\n" +
            "  :brand_id: 49120\n" +
            "  :size: each\n" +
            "  :alcoholic: false\n" +
            "  :details: \"\"[Fair Trade Certified]\"\"\n" +
            "  :gluten_free: false\n" +
            "  :kosher: false\n" +
            "  :low_fat: false\n" +
            "  :organic: false\n" +
            "  :sugar_free: false\n" +
            "  :fat_free: false\n" +
            "  :vegan: false\n" +
            "  :vegetarian: false\n" +
            "\",,2015-11-01 00:06:19.796944"

    String suspectString = "---\n" +
            "product_attributes:\n" +
            "-\n" +
            "- :name: Ornaments\n" +
            "  :brand_id: 49120\n" +
            "  :size: each\n" +
            "  :alcoholic: false\n" +
            "  :details: \"[Fair Trade Certified]\"\n" +
            "  :gluten_free: false\n" +
            "  :kosher: false\n" +
            "  :low_fat: false\n" +
            "  :organic: false\n" +
            "  :sugar_free: false\n" +
            "  :fat_free: false\n" +
            "  :vegan: false\n" +
            "  :vegetarian: false\n"

    when:
    String[] values = parser.parseLine(bigline)

    then:
    values.length == 5
    values[0] == "28613099"
    values[1] == "Product::Source"
    values[2] == suspectString
}