Question

我是一个CSV文件，其内容如下：

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.

我使用OpenCSV和其他CSV库进行解析但它没有用。

我使用了StackOverflow question中引用的正则表达式，但它也没有用。

但是，当我在Excel中打开它时它工作正常。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，只会将其包含在文本限定符中。当这样的内容用双引号括起来，并且双引号是内容的一部分时，它将使用双引号进行转义。换句话说，它改为双倍双引号。但是如果内容有双引号，那么它不会包含在文本限定符中。

请就此事提出建议。

解析时上述内容的输出应如下所示：

输出应如下：

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.

我尝试使用open csv并尝试使用正则表达式进行拆分：

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

但没有用。

我的数据如下：

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,

希望将其解析如下（当我们在excel中看到它时，我曾经代表一个空单元格）

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

尝试以下正则表达式：

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.

会发光。

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.

Answer 2

使用uniVocity-parsers解析您的输入时没有问题：

    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：我是这个库的作者，它是开源和免费的（Apache 2.0许可证）

在Java中解析CSV，仅当内容包含逗号

2 个答案: