java中包含逗号时如何按逗号分割行

Question

我想拆分必须符合csv语法但包含逗号的文本

例如： 帐户id标题文本

String line = "account123,2222,Thnaks for reaching out,\"Hey [[customerFirstName]], Thanks for reaching out to us.\""

String[] splitted = line.split(",");

结果:

splitted = {String[5]@539} 
 0 = "account123"
 1 = "2222"
 2 = "Thnaks for reaching out"
 3 = ""Hey [[customerFirstName]]"
 4 = " Thanks for reaching out to us.""

但我想

splitted = {String[4]@539} 
             0 = "account123"
             1 = "2222"
             2 = "Thnaks for reaching out"
             3 = "Hey [[customerFirstName]], Thanks for reaching out to us.\"

Answer 1

以下是一个简单的解决方案：

public static void main(String... args) {
    String line = "account123,2222,Thnaks for reaching out,\"Hey [[customerFirstName]], Thanks for reaching out to us.\",\"Hey [[customerFirstName]], Thanks for reaching out to us.\"";
    for (String s : splitByComma(line)) {
        System.out.println(s);
    }
}

private static List<String> splitByComma(String line) {
    String[] words = line.split(",");
    List<String> list = new ArrayList<>();
    for (int i = 0; i < words.length; ++i) {
        if (words[i].startsWith("\"")) { // collect from the start of the cell;
            String s = words[i].substring(1);
            while (i < words.length - 1) {
                s += "," + words[++i].substring(0, words[i].length() - 1);
                if (words[i++].endsWith("\"")) break; // jump out of the cell after the closing double quotes;
            }
            list.add(s);
            i ;
        } else {
            list.add(words[i]);
        }
    }
    return list;
}

您的输出将是：

account123
2222
Thnaks for reaching out
Hey [[customerFirstName]], Thanks for reaching out to us.
Hey [[customerFirstName]], Thanks for reaching out to us.

Answer 2

正如您所发现的，您的解决方案非常脆弱。好消息是，有许多更健壮的CSV解决方案可用。为了回答这个问题，我将使用openCSV，其中您的阅读代码变成：

CSVReader csvReader = new CSVReader(reader);
List<String[]> list = csvReader.readAll();
reader.close();
csvReader.close();

希望这有助于