读取现有的 csv 然后写回 CSV 将单元格中表示为双引号的英寸作为 "" 而不是 \"

Question

我有一个 CSV，它是通过构建 StringBuilder 并使用 PrintWriter 写入生成的。然后我再次阅读该 CSV 并向其附加一些内容，但它弄乱了其中带有双引号的单元格，用于表示英寸。它打印双引号两次 15"

添加到 StringBuilder 的值之一是：

代码 1.1

String title = "Poly Nuclear 15\" Laptop Series Notebook Intel Windows10+ 7.6V Battery 8GB Memory"
Text t1 = new Text();
t1.setContent(title);

if (title.contains("\"")) {
      t1.setContent("Poly Nuclear 15\\" Laptop Series Notebook Intel Windows10+ 7.6V Battery 8GB Memory");
}

我使用 PrintWriter 的第一个输出（在编写使用 StringBuilder 创建的逗号分隔字符串之后）是这样的：

OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(filename, true), StandardCharsets.UTF_8);
PrintWriter printWriter = new PrintWriter(outputStreamWriter);
printWriter.println(stringBuilder.toString());

key,date,ms_id,title,alertId
190-2,2022-02-20 12:35:09,107193,Poly Nuclear 15"  Laptop Series Notebook Intel Windows10+ 7.6V Battery 8GB Memory,

代码 1.2

现在我在每行的末尾添加最后一列的值 alertId。我正在阅读并附加到每一行，然后按如下方式写回 CSV：

// Here below method is called as writeBack("1222") with fixed value.
public void writeBack(String value) {
      String filePath = "/dir1/dir2/test.csv";
      String key = "alertId"; // column name for which value needs to be added.
      InputStreamReader inputStreamReader = new InputStreamReader(new 
      FileInputStream(filePath), StandardCharsets.UTF_8);
      CSVReader reader = new CSVReader(inputStreamReader);

      String[] header = reader.readNext();
      int columnNum = Arrays.asList(header).indexOf(key);

      List<String[]> feedData = reader.readAll();
      try {
        for (String[] row : feedData) {
          row[columnNum] = value;
        }
        reader.close();

        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(filePath), StandardCharsets.UTF_8);
        CSVWriter writer = new CSVWriter(outputStreamWriter);
        writer.writeNext(header);
        writer.writeAll(feedData);
        writer.flush();
        writer.close();
      } catch (Exception e) {
        writeLog("ERROR", e);

      }
}

我的最终输出是这样的，除了字符串值有双引号 15""

之外，一切都是正确的

"key","date","ms_id","title","alertId"
"190-2","2022-02-20 12:35:09","107193","Poly Nuclear 15""  Laptop Series Notebook Intel Windows10+ 7.6V Battery 8GB Memory","1222"

如何避免最终输出中表示英寸的单元格中出现双引号？

预期输出

"key","date","ms_id","title","alertId"
"190-2","2022-02-20 12:35:09","107193","Poly Nuclear 15\"  Laptop Series Notebook Intel Windows10+ 7.6V Battery 8GB Memory","1222"

Answer 1

感谢@Mark Rotteveel 的指针提示。这有助于我寻找不同的分隔符并转义更多字符。

意识到 CSVReader 和 CSVWriter 也有不同的转义字符。

我终于用下面的方法解决了：

import org.apache.commons.lang.StringEscapeUtils;
...

StringEscapeUtils.escapeCsv("Poly Nuclear 15\" Laptop Series, Notebook \ Intel Windows10+ 7.6V Battery 8GB Memory")

并在写作时使用它：

import com.opencsv.ICSVWriter;
...
char escapeChar = '\';
CSVWriter writer = new CSVWriter(outputStreamWriter, ICSVWriter.DEFAULT_SEPARATOR, ICSVWriter.DEFAULT_QUOTE_CHARACTER, escapeChar, ICSVWriter.DEFAULT_LINE_END);

读取现有的 csv 然后写回 CSV 将单元格中表示为双引号的英寸作为 "" 而不是 \"

Reading existing csv and then writing back to CSV puts inches expressed as double quotes in a cell as "" instead of \"

java

csv

printwriter

csvreader

csvwriter

代码 1.1

代码 1.2