LocalDateTime无法分析“June”

Question

public LocalDateTime parseDate(String strDate, String strTime) {
    strTime = strTime + ":00";
    System.out.println("Date: " + strDate);
    System.out.println("Time: " + strTime);
    
    
    LocalDate date = LocalDate.now();
    DateTimeFormatter dtfForDate = new DateTimeFormatterBuilder()
                                    .parseCaseInsensitive()
                                    .parseDefaulting(ChronoField.YEAR, date.getYear())
                                    .appendPattern("d['th']['st']['rd']['nd'] MMM")
                                    .toFormatter(Locale.ENGLISH);

    DateTimeFormatter dtfForTime = DateTimeFormatter.ofPattern("H:m:s", Locale.ENGLISH);
    
    LocalDateTime ldt = LocalDate.parse(strDate, dtfForDate)
                                    .atTime(LocalTime.parse(strTime, dtfForTime));
    System.out.println("Local Date Time: " + ldt);
    
    return ldt;
}

Date: 1st June

Time: 9:15:00

Answer 1

使用下面的模式来兼顾这两种情况：三个字母的缩写月份名称和完整的月份名称：

.appendPattern("d['th']['st']['rd']['nd'] [MMMM][MMM]")

演示：

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.temporal.ChronoField;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        System.out.println(parseDate("1st June", "9:15:00"));
        System.out.println(parseDate("1st Jun", "9:15:00"));
    }

    public static LocalDateTime parseDate(String strDate, String strTime) {
        LocalDate date = LocalDate.now();
        DateTimeFormatter dtfForDate = new DateTimeFormatterBuilder()
                                        .parseCaseInsensitive()
                                        .parseDefaulting(ChronoField.YEAR, date.getYear())
                                        .appendPattern("d['th']['st']['rd']['nd'] [MMMM][MMM]")
                                        .toFormatter(Locale.ENGLISH);

        DateTimeFormatter dtfForTime = DateTimeFormatter.ofPattern("H:m:s", Locale.ENGLISH);

        LocalDateTime ldt = LocalDate.parse(strDate, dtfForDate).atTime(LocalTime.parse(strTime, dtfForTime));

        return ldt;
    }
}

输出：

2021-06-01T09:15
2021-06-01T09:15