Question

我正在使用OpenCSV。

我有CSVReader试图解析CSV文件该文件具有引号char "和分隔符char ,以及转义字符"。

请注意，CSV包含以下单元格：

"ballet 24"" classes"
"\"

实际上代表了这些值：

ballet 24" classes
\

示例：

"9/6/2014","3170168","123652278","Computer","2329043290","Bing and Yahoo! search","22951990789","voice lesson","Broad","0.00","0","1","3.00","0.00","0.00","0.00","7","0","",""
"9/6/2014","3170168","123652278","Smartphone","2329043291","Bing and Yahoo! search","22951990795","ballet class","Broad","0.00","0","1","1.00","0.00","0.00","0.00","0","0","",""
"9/6/2014","3170168","123652278","Smartphone","2329043291","Bing and Yahoo! search","22951990797","ballet 24"" classes","Broad","0.00","0","1","1.00","0.00","0.00","0.00","0","0","",""
"9/6/2014","3170168","123652278","Smartphone","2329043291","Bing and Yahoo! search","22951990797","ballet classes","Broad","0.00","0","1","1.00","0.00","0.00","0.00","0","0","",""
"9/6/2014","3170168","123652278","Computer","2329043291","Bing and Yahoo! search","22951990817","\","Broad","0.00","0","1","1.00","0.00","0.00","0.00","5","0","",""
"9/6/2014","3170168","123652278","Computer","2329043293","Bing and Yahoo! search","22951990850","zumba classes","Broad","0.00","0","1","7.00","0.00","0.00","0.00","5","0","",""
"9/6/2014","3170168","123652278","Smartphone","2329043293","Bing and Yahoo! search","22951990850","zumba classes","Broad","0.00","0","4","1.00","0.00","0.00","0.00","5","0","",""
"9/6/2014","3170168","123652278","Computer","2329043293","Bing and Yahoo! search","22951990874","zumba lessons","Broad","0.00","0","1","2.00","0.00","0.00","0.00","0","0","",""

我的问题是我无法为"构造函数指定CSVReader转义字符（即使其与引用字母相同）如果我这样做，CSVReader就会变得疯狂，它将整个CSV行作为单个CSV单元格读取。

是否还有其他人遇到此错误以及如何解决此问题？！

Answer 1

如果使用CsvReader的默认设置，它将起作用。

检查他们拥有的这个开放式错误：sourceforge.net/p/opencsv/bugs/83：

实际上，它运作正常，而不是你的想法。它的默认值是分隔符的逗号，引号字符的引号和反斜杠逃避角色。但是，它理解两个连续的报价字符作为转义引号字符。所以，如果你只是去默认情况下，它会正常工作。

默认情况下，它可以使用双引号转义双引号，但您的＆＃39; true＆＃39;转义字符必须仍然是别的。

以下是有效的：

CSVReader reader = new CSVReader(new FileReader(App.class.getClassLoader().getResource("csv.csv").getFile()), ',','"','-');

逗号作为分隔符
双引号为引用字符
破折号（任何其他角色）作为转义字符

起初我把＆＃39; \＆＃39;作为逃避角色，然后，你的领域＆＃34; \＆＃34;需要修改以逃避转义字符。

Answer 2

CSVReader不完全符合RFC4180。使用其较新的CSV阅读器（RFC4180Parser）：

RFC4180Parser rfc4180Parser = new RFC4180ParserBuilder().build();
CSVReaderBuilder csvReaderBuilder = new CSVReaderBuilder(
    new FileReader("input.csv"));

CSVReader reader = csvReaderBuilder
    .withCSVParser(rfc4180Parser)
    .build();

要读取格式为CSV的字符串行：

String test = "ballet 24\"\" classes";
String[] columns = new RFC4180Parser().parseLine(test);

要使用阅读器（替代方法是reader.readNext()）

for (String[] line : reader.readAll()) {
  for (String s : line) {
    System.out.println(s);
  }
}

有关更多详细信息，请参见http://opencsv.sourceforge.net/#rfc4180parser。

代码取自GeekPrompt

Answer 3

无法通过CSVReader完成

from pyspark.sql.session import SparkSession

spark = SparkSession(sc)
rdd = spark.read.csv("csv.csv", multiLine=True, header="False", encoding='utf-8', escape= "\"")

CSVReader - 使用＆＃34时的错误逃脱char

3 个答案: