CSV解析Java中这仅适用于内容有逗号

Question

我有，其内容如下CSV文件文本限定符：

1,"hello, there",I have a csv in which,"only when ""double quote"" or comma are there in the content",it will be wrapped in the double quotes,otherwise not,something like 1/2" will not be wrapped up in double quotes. 

我用OpenCSV等CSV库解析，但它并没有工作。

我用StackOverflow question引用的正则表达式，但它也没有工作。

但是，当我在Excel中打开它工作正常。有人可以给我一个关于如何解析这个CSV文件的提示。

请注意，当内容包含逗号时，只有它包含在文本限定符中。当这样的内容包含在双引号中，并且双引号是内容的一部分时，则使用双引号将其转义。换句话说，它变成了双重双引号。但是，如果内容有双引号，那么它不会包含在文本限定符中。

请告知这一点。

当解析应尽可能低于上述内容的输出：

输出应该如下：

1 
hello, there 
I have a csv in which 
only whn "double quote" or comma are there in the content 
it will be wrapped in the double quotes 
otherwise not 
something like 1/2" will not be wrapped up in double quotes. 

我使用利用正则表达式打开CSV和还试图分裂尝试：

",(?=([^\"]*\"[^\"]*\")*[^\"]*$)" 

但没用。

我的数据是象下面这样：

PRODUCT,,1/2" 18V CORDLESS XRP LI-LON DRILL/DRIVE,P,2510906459,,DEWALT TOOLS,,,<br><img src="http://example.com/image.png"><br><br><p><b>UNIT OF MEASURE: EA<br><br> QTY PER UNIT OF MEASURE: 1<br><br> MINIMUM ORDER QUANTITY: 1<br></P></b>DEWALT TOOLS DCD960KL - 1/2" 18V CORDLESS XRP LI-LON DRILL/DRIVER KIT - XRP™ CORDLESS DRILLS - BEST IN CLASS LENGTH FOR IMPROVED BALANCE AND BETTER CONTROL|LED WORKLIGHT PROVIDES INCREASED VISIBILITY IN CONFINED SPACES|PATENTED 3-SPEED ALL-METAL TRANSMISSION MATCHES THE TOOL TO TASK FOR FASTEST APPLICATION SPEED AND IMPROVED - EQUAL TO 115-DCD960KL, 

希望这是解析为以下（我用来表示一个空单元格时，我们在Excel中看到它）

PRODUCT 
<BLANK> 
1/2" 18V CORDLESS XRP LI-LON DRILL/DRIVE 
P 
2510906459 
<BLANK> 
DEWALT TOOLS 
<BLANK> 
<BLANK> 
<br><img src="http://example.com/image.png"><br><br><p><b>UNIT OF MEASURE: EA<br><br> QTY PER UNIT OF MEASURE: 1<br><br> MINIMUM ORDER QUANTITY: 1<br></P></b>DEWALT TOOLS DCD960KL - 1/2" 18V CORDLESS XRP LI-LON DRILL/DRIVER KIT - XRP™ CORDLESS DRILLS - BEST IN CLASS LENGTH FOR IMPROVED BALANCE AND BETTER CONTROL|LED WORKLIGHT PROVIDES INCREASED VISIBILITY IN CONFINED SPACES|PATENTED 3-SPEED ALL-METAL TRANSMISSION MATCHES THE TOOL TO TASK FOR FASTEST APPLICATION SPEED AND IMPROVED - EQUAL TO 115-DCD960KL 

Answer 1

我没有什么问题uniVocity-parsers解析您的输入：

String input = "PRODUCT,,1/2\" 18V CORDLESS XRP LI-LON DRILL/DRIVE,P,2510906459,,DEWALT TOOLS,,,<br><img src=\"http://example.com/image.png\"><br><br><p><b>UNIT OF MEASURE: EA<br><br> QTY PER UNIT OF MEASURE: 1<br><br> MINIMUM ORDER QUANTITY: 1<br></P></b>DEWALT TOOLS DCD960KL - 1/2\" 18V CORDLESS XRP LI-LON DRILL/DRIVER KIT - XRP™ CORDLESS DRILLS - BEST IN CLASS LENGTH FOR IMPROVED BALANCE AND BETTER CONTROL|LED WORKLIGHT PROVIDES INCREASED VISIBILITY IN CONFINED SPACES|PATENTED 3-SPEED ALL-METAL TRANSMISSION MATCHES THE TOOL TO TASK FOR FASTEST APPLICATION SPEED AND IMPROVED - EQUAL TO 115-DCD960KL,"; 
    Reader reader = new StringReader(input); 

    CsvParserSettings settings = new CsvParserSettings(); //many options here, check the tutorial. 
    settings.setNullValue("<BLANK>"); //use that to obtain <BLANK> to represent nulls 

    String[] row = new CsvParser(settings).parseAll(reader).get(0); 
    for(String element : row){ 
     System.out.println(element); 
    } 

输出：

PRODUCT 
<BLANK> 
1/2" 18V CORDLESS XRP LI-LON DRILL/DRIVE 
P 
2510906459 
<BLANK> 
DEWALT TOOLS 
<BLANK> 
<BLANK> 
<br><img src="http://example.com/image.png"><br><br><p><b>UNIT OF MEASURE: EA<br><br> QTY PER UNIT OF MEASURE: 1<br><br> MINIMUM ORDER QUANTITY: 1<br></P></b>DEWALT TOOLS DCD960KL - 1/2" 18V CORDLESS XRP LI-LON DRILL/DRIVER KIT - XRP™ CORDLESS DRILLS - BEST IN CLASS LENGTH FOR IMPROVED BALANCE AND BETTER CONTROL|LED WORKLIGHT PROVIDES INCREASED VISIBILITY IN CONFINED SPACES|PATENTED 3-SPEED ALL-METAL TRANSMISSION MATCHES THE TOOL TO TASK FOR FASTEST APPLICATION SPEED AND IMPROVED - EQUAL TO 115-DCD960KL 
<BLANK> 

免责声明：我这个库的作者，它的开源和免费（Apache 2.0许可证）

Answer 2

尝试遵循正则表达式：

Stream<String> lines = Files.lines(Paths.get("path to csv file")); 

Pattern regex = Pattern.compile("\"(.*?)\"(?=,|$)|(?<=(?:,|^))(.*?)(?=,|$)", 
     Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); 

lines.forEach(line -> { 
    Matcher matcher = regex.matcher(line); 
    while (matcher.find()) { 
     String content = matcher.group(1) == null ? matcher.group() : matcher.group(1); 
     System.out.println(content); 
    } 
}); 

基于示例输入文本

1,"hello, there",I have a csv in which, 
"only when ""double quote"" or comma are there in the content", 
it will be wrapped in the double quotes,otherwise not, 
something like 1/2" will not be wrapped up in double quotes. 

它会发射。

1 
hello, there 
I have a csv in which 
only when ""double quote"" or comma are there in the content 
it will be wrapped in the double quotes 
otherwise not 
something like 1/2" will not be wrapped up in double quotes.