Question

使用我在这里找到的答案，我发现了一种将结果集写入csv文件的方法。但是，它目前只是将数组的每个元素写入新列。我如何更改以下代码以更改格式以在每个第x个元素上创建新行？如下所示？

int value = 2
Current format:  a, b, c, d, e, f

Desired format: a, b,
                c, d,
                e, f

我知道我可以利用int值的模数，但不确定如何写入特定的列或行。

private static final String DEFAULT_SEPARATOR = " ";

 public static void writeLine(Writer w, List<String> values, String separators, String customQuote) throws IOException {

    boolean first = true;

    //default customQuote is empty

    if (separators == " ") {
        separators = DEFAULT_SEPARATOR;
    }

    StringBuilder sb = new StringBuilder();
    for (String value : values) {
        if (!first) {
            sb.append(separators);
        }
        if (customQuote == " ") {
            sb.append(followCVSformat(value));
        } else {
            sb.append(customQuote).append(followCVSformat(value)).append(customQuote);
        }

        first = false;
    }
    sb.append("\n");
    w.append(sb.toString());


}


private static String followCVSformat(String value) {

        String result = value;
        if (result.contains("\"")) {
            result = result.replace("\"", "\"\"");
        }
        return result;

    }

Answer 1

public static void writeLine(
        Writer w, List<String> values, String separators, String customQuote, int elementsPerRow)
        throws IOException {
    ...
    int counter = 0;
    for (String value : values) {
        if (!first) {
            sb.append(separators);
        }
        if (counter != 0 && counter % elementsPerRow == 0)
            sb.append("\n");
        if (customQuote == " ") {
            sb.append(followCVSformat(value));
        } else {
            sb.append(customQuote).append(followCVSformat(value)).append(customQuote);
        }
        first = false;
        counter++;
    }
    ...

每xth元素java csv写入新行

1 个答案: