java - 将二维 boolean 数组写入和读取 CSV 文件时最简单的方法是什么？

Question

我想将二维 boolean 数组写入 CSV 文件。 我正在使用 Apache Commons 的 CSVParser。问题是我找不到将数组转换为可以写入 CSV 文件然后再转换回来的东西的内置方法。

那么除了使用 Arrays.deepToString(...) 之外还有其他方法吗？然后写一个复杂且容易出错的函数来解析数组？

如果boolean[][] array = Arrays.parse<boolean[][]>(Arrays.deepToString(oldArray))就好了存在...

感谢您的帮助。

Answer 1

使用uniVocity-parsers写/读你的 boolean 值。

public static void main(String ... args){
    CsvWriterSettings writerSettings = new CsvWriterSettings();

    ObjectRowWriterProcessor writerProcessor = new ObjectRowWriterProcessor(); // handles rows of objects and conversions to String.
    writerProcessor.convertAll(Conversions.toBoolean("T", "F")); // will write "T" and "F" instead of "true" and "false"

    writerSettings.setRowWriterProcessor(writerProcessor);

    CsvWriter writer = new CsvWriter(writerSettings);
    writerSettings.setHeaders("A", "B", "C", "D");

    String line1 = writer.processRecordToString(true, false, false, true);
    String line2 = writer.processRecordToString(false, false, true, true);

    System.out.println("### Rows written ###");

    System.out.println(line1);
    System.out.println(line2);

    // Now, let's read these lines

    CsvParserSettings parserSettings = new CsvParserSettings();

    ObjectRowListProcessor readerProcessor = new ObjectRowListProcessor(); // handles conversions from String to Objects and adds the result to a list
    readerProcessor.convertAll(Conversions.toBoolean("T", "F")); //reads "T" and "F" back to true and false

    parserSettings.setRowProcessor(readerProcessor);

    CsvParser parser =  new CsvParser(parserSettings);
    parser.parseLine(line1); //handled by the readerProcessor
    parser.parseLine(line2); //handled by the readerProcessor

    System.out.println("### Rows parsed ###");

    List<Object[]> rows = readerProcessor.getRows();
    for(Object[] row : rows){
        System.out.println(Arrays.toString(row));
    }
}

上面的代码产生:

### Rows written ###
T,F,F,T
F,F,T,T
### Rows parsed ###
[true, false, false, true]
[false, false, true, true]

注意:您在编写时不需要显式设置 header ，但我刚刚在 master branch of the project 中找到(并修复)了它