org.supercsv.exception.SuperCsvCellProcessorException：输入值应为 java.lang.String 类型，但为 java.util.Date

Question

我正在使用 SuperCsv 将 csv 文件解析为 Javabeans，然后将其保存在数据库中 table。尝试输入日期列时出现以下异常。在阅读了 superscv API 和文档后，我真的不明白如何正确地将 csv 写入 Javabean 并将其保存到数据库中。异常：

org.supercsv.exception.SuperCsvCellProcessorException: the input value should be of     type java.lang.String but is java.util.Date processor=org.supercsv.cellprocessor.ParseDate context={lineNo=2, rowNo=2, columnNo=3, rowSource=[moredata, 450, Thu Jan 01 00:09:00 PST 2015]}

csv 文件：

someData,23,01/09/2015
moredata,450,01/09/2015
evenMoreData,500,01/09/2015

我正在按如下方式解析 CSV：

private List<Timeseries> readCSVToBean() throws IOException {
    ICsvBeanReader beanReader = null;

    List<Timeseries> timeSeries = new ArrayList<Timeseries>();
    try {
        beanReader = new CsvBeanReader(new FileReader(pathName),
                CsvPreference.STANDARD_PREFERENCE);

        // the name mapping provide the basis for bean setters 
        final String[] nameMapping = new String[]{"varval", "actualNum", "daterec"};
        //just read the header, so that it don't get mapped to Timeseries object
        final String[] header = beanReader.getHeader(false);
        final CellProcessor[] processors = getProcessors();

        Timeseries timeEntity;

        while ((timeEntity = beanReader.read(Timeseries.class, nameMapping,
                processors)) != null) {
            timeSeries.add(timeEntity);
        }

    } finally {
        if (beanReader != null) {
            beanReader.close();
        }
    }
    return timeSeries;
}

private static CellProcessor[] getProcessors() {

    final CellProcessor[] processors = new CellProcessor[]{
        new NotNull(), // varval
        new ParseInt(), // actualNum
        //new FmtDate("dd/MM/yyyy") 
        new ParseDate("dd/mm/yyyy") // Daterec
    };
    return processors;
}

Timeseries bean 是：

public class Timeseries implements Serializable {
    private static final long serialVersionUID = 1L;

    private Integer timid;
    private String varval;
    private Integer actualnum;
    private Date daterec;

    // ...
}

Answer 1

如 Super CSV website 中所述，ParseDate 用于读取（String -> Date），FmtDate 用于写入(Date -> String).

您需要一组处理器用于读取，另一组用于写入。