Dreamer Dreamer - 1 year ago 121
Java Question

How to escape comma and double quote at same time for CSV file?

I am writing a Java app to export data from Oracle to csv file

Unfortunately the content of data may quite tricky. Still comma is the deliminator, but some data on a row could be like this:


123, John, Smith, 39, I said "Hey, I am 5'10"."

so this is one of the string on the

I said "Hey, I am 5'10"."

No kidding, I need to show above comment without compromise in excel or open office from a CSV file generated by Java, and of course cannot mess up other regular escaping situation(i.e. regular double quotes, and regular comma within a tuple). I know regular expression is powerful but how can we achieve the goal with such complicated situation?

Answer Source

There are several libraries. Here are two examples:

❐ The YAML file Apache Commons Lang

Apache Commons Lang includes a special class to escape or unescape strings (CSV, EcmaScript, HTML, Java, Json, XML): org.apache.commons.lang3.StringEscapeUtils.

  • Escape to CSV

    String escaped = StringEscapeUtils
        .escapeCsv("I said \"Hey, I am 5'10\".\""); // I said "Hey, I am 5'10"."
    System.out.println(escaped); // "I said ""Hey, I am 5'10""."""
  • Unescape from CSV

    String unescaped = StringEscapeUtils
        .unescapeCsv("\"I said \"\"Hey, I am 5'10\"\".\"\"\""); // "I said ""Hey, I am 5'10""."""
    System.out.println(unescaped); // I said "Hey, I am 5'10"."

* You can download it from here.

❐ OpenCSV

If you use OpenCSV, you will not need to worry about escape or unescape, only for write or read the content.

  • Writing file:

    FileOutputStream fos = new FileOutputStream("awesomefile.csv"); 
    OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");
    CSVWriter writer = new CSVWriter(osw);
    String[] row = {
        "I said \"Hey, I am 5'10\".\""
  • Reading file:

    FileInputStream fis = new FileInputStream("awesomefile.csv"); 
    InputStreamReader isr = new InputStreamReader(fis, "UTF-8");
    CSVReader reader = new CSVReader(isr);
    for (String[] row; (row = reader.readNext()) != null;) {

* You can download it from here.

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